Multi Tech Systems Network Card MT5600DSDV2 User Manual

and  
User Guide  
 
MultiModemDSVD User Guide  
Contents  
Contents  
Chapter 1 - Introduction............................................................................ 6  
Introduction ............................................................................................................................. 7  
Product Description ................................................................................................................ 7  
Features .................................................................................................................................... 7  
What Is in Your Modem Package? ....................................................................................... 9  
Related Manuals ..................................................................................................................... 9  
Chapter 2 - Installation............................................................................ 10  
Introduction ........................................................................................................................... 11  
What You Will Need ............................................................................................................ 11  
Safety Warnings .................................................................................................................... 11  
Step 1: Mount the Feet.......................................................................................................... 12  
Step 2: Change the Speaker Jumper (MT5600DSDV only) ............................................. 12  
Opening the Modem ..................................................................................................... 12  
Changing the Speaker Jumper ..................................................................................... 13  
Step 3: Connect the Modem to Your System .................................................................... 14  
RS232 Connection .......................................................................................................... 14  
Line Connection ............................................................................................................. 14  
Phone Connection .......................................................................................................... 15  
Microphone Connection (MT5600DSDV only) ......................................................... 15  
Speaker Connection (MT5600DSDV only)................................................................. 15  
Power Connection ......................................................................................................... 15  
Power-On Test ............................................................................................................... 15  
Surge Protectors and Lightning ................................................................................... 15  
Step 4: Install the Modem Driver ....................................................................................... 16  
Installing the Modem Driver ....................................................................................... 16  
Removing Your Old Modem Driver ........................................................................... 16  
Step 5: Install PhoneTools Software ................................................................................... 17  
Chapter 3 - Operation.............................................................................. 18  
Introduction ........................................................................................................................... 19  
Front Panel ............................................................................................................................. 19  
Configuring the Modem ...................................................................................................... 20  
Connecting to the Internet ................................................................................................... 20  
Dial-Up Networking ............................................................................................................ 21  
Dial-Up Networking in Windows 95/ 98 ................................................................... 21  
Dial-Up Networking in Windows Me ........................................................................ 22  
Dial-Up Networking in Windows NT 4.0 .................................................................. 22  
Dial-Up Networking in Windows 2000...................................................................... 23  
Fax Operation ........................................................................................................................ 24  
Voice Operation .................................................................................................................... 24  
To Originate a Voice Call in Speakerphone Mode ................................................... 24  
To Answer a Voice Call in Speakerphone Mode ...................................................... 25  
To Originate a DSVD Call Using the Headset (MT5600DSDV only)..................... 25  
To Answer a DSVD Call Using the Headset (MT5600DSDV only) ....................... 26  
3
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
Contents  
Chapter 4 - AT Commands...................................................................... 27  
AT Commands ...................................................................................................................... 28  
AT Command Summary ..................................................................................................... 29  
Voice Commands .................................................................................................................. 44  
S-Registers .............................................................................................................................. 46  
Result Codes .......................................................................................................................... 50  
Chapter 5 - Solving Problems ............................................................... 53  
Introduction ........................................................................................................................... 54  
None of the Indicators Light ............................................................................................... 54  
The Modem Does Not Respond to Commands................................................................ 55  
The Modem Dials But Cannot Connect ............................................................................. 56  
The Modem Disconnects While Online ............................................................................. 57  
The Modem Cannot Connect When Answering .............................................................. 58  
File Transfer Is Slower Than It Should Be ......................................................................... 58  
Data Is Being Lost ................................................................................................................. 58  
There Are Garbage Characters on the Monitor ................................................................ 59  
The Modem Doesnt Work with Caller ID ........................................................................ 59  
Fax and Data Software Cant Run at the Same Time ....................................................... 59  
Appendix A: Regulatory Compliance .................................................... 61  
FCC Part 68 Telecom ............................................................................................................ 61  
FCC Part 15 ............................................................................................................................ 62  
Industry Canada ................................................................................................................... 62  
Fax Branding Statement ....................................................................................................... 63  
Canadian Limitations Notice .............................................................................................. 63  
EMC, Safety, and R&TTE Directive Compliance ............................................................. 64  
International Modem Restrictions ...................................................................................... 64  
Appendix B:Technical Specifications ................................................... 65  
Appendix C:Warranty, Service, and  
Technical Support ............................................................ 68  
Multi-Tech Systems, Inc. Warranty & Repairs Policies ................................................... 68  
Online Warranty Registration ...................................................................................... 69  
Service ............................................................................................................................. 70  
Replacement Parts ......................................................................................................... 71  
Technical Support .......................................................................................................... 71  
Internet Sites ................................................................................................................... 71  
4
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
Contents  
Appendix D: Upgrading the Modem....................................................... 72  
Introduction ........................................................................................................................... 72  
Upgrade Overview ............................................................................................................... 72  
Step 1: Identify the Modem Firmware ............................................................................... 72  
Step 2: Identify the Current Firmware Version ................................................................ 73  
Step 3: Download the Upgrade File ................................................................................... 73  
Step 4: Extract the Upgrade Files........................................................................................ 73  
Step 5: Clear Your Stored Parameters ................................................................................ 73  
Step 6: Upgrade the Modems Firmware .......................................................................... 74  
Step 7: Restore Your Parameters ........................................................................................ 74  
Index ......................................................................................................... 75  
5
Multi-Tech Systems, Inc.  
 
Ch a p t e r 1 -  
In t r o d u c t io n  
 
MultiModemDSVD User Guide  
1 Introduction  
In t r o d u ct io n  
Congratulations on your purchase of your MultiModemDSVD! You have acquired  
not only one of the finest intelligent data, fax, and voice modems available, but a  
modem that can transmit voice and data at the same time. This user guide will help  
you to install, configure, test, and use your modem.  
Pr o d u ct De s cr ip t io n  
The MultiModemDSVD modem incorporates both the ITU-T V.90 and the K56flex™  
protocols, both of which enable Internet connections at data rates up to 53K bps*  
over standard telephone lines. Using these protocols, Internet service providers  
(ISPs) are able to send data downstream to your computer at high speeds because  
data on the telephone network normally is converted from digital to analog only once  
before it reaches your modem. Upstream transmissions, and transmissions between  
client modems, are limited to data rates of 33.6K bps, as are downstream transmis-  
sions that are converted more than once on the telephone network.  
The MultiModemDSVD offers interactive automatic dialing and command mode  
configuration. You can store up to four command line/ telephone numbers of up to  
40 characters each in the modems nonvolatile memory. The modem pulse or tone  
dials, and recognizes dial tones and busy signals for reliable call-progress detection.  
The modem can also detect AT&T calling card tones. It is FCC-Registered for con-  
nection to telephone networks without notification to the telephone company.  
Digital simultaneous voice and data (DSVD) operation allows data transfer and  
voice conversation to occur simultaneously during a data connection. On a DSVD  
call, a headset or microphone and speaker can be used as the voice interface. Both  
local and remote modems must have compatible DSVD technology to support the  
DSVD function. The MultiModemDSVD is compatible with the industry-standard  
ITU-T V.70 DSVD specification.  
Fe a t u r e s  
General  
• Complies with major ITU-T, TIA, and EIA international standards to ensure com-  
patibility with other modems.  
• Distinguishes data, fax, or voice calls using DTMF and tone detection with soft-  
ware packages supporting these features.  
• Supports serial port speeds to 230.4K bps with compatible serial ports  
• On U.S. products, includes Caller ID to identify your callers phone number.  
*Though this modem is capable of 56K bps download performance, line impairments, public  
telephone infrastructure, and other external technological factors currently prevent maxi-  
mum 56K bps connections.  
7
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
1 Introduction  
Data  
Supports the ITU-T V.90 and K56flexTM standards for data transmission speeds up  
to 56K bps while maintaining compatibility with lower-speed modems.  
Note: Under the 56K bps standards, you can asymmetrically download data from an  
ISP at speeds up to 53K bps, whereas you can upload only at speeds up to 33.6K bps.  
Supports the enhanced ITU-T V.34 standard, with data transmission speeds to  
33.6K bps, while maintaining compatibility with lower-speed modems.  
Supports V.90 and K56flex speeds plus 33.6K, 31.2K, 28.8K, 26.4K, 24K, 21.6K,  
19.2K, 16.8K, 14.4K, 12K, 9.6K, 7.2K, 4.8K, 2.4K, 1.2K, and 0–300 bps.  
Supports automatic fallback to slower speeds in noisy line conditions, and fall-  
forward to faster speeds as conditions improve.  
Supports ITU-T V.42 LAP-M and MNP Class 3 and 4 error correction.  
Supports ITU-T V.42bis (4-to-1) and MNP 5 (2-to-1) data compression.  
Automatically disables compression when transferring already-compressed files.  
Can autodial, redial, pulse (rotary) and touch-tone dial.  
Detects dial tones and busy signals for reliable call-progress detection.  
Compatible with the standard AT command set used by most communication  
programs.  
Has MNP10 data throughput enhancement.  
Supports the H.324 protocol (videophone ready).  
Supports distinctive rings to route voice, data, or fax calls on a single phone line.  
Supports Plug and Play (PnP).  
Can be upgraded by flash programming.  
Fax  
Supports V.17, Class 1, Class 2, and Group 3 fax communication standards, allow-  
ing it to communicate with other fax modems as well as with fax machines.  
Sends and receives faxes from your computer at 14,400 bps, 9600 bps, 7200 bps,  
4800 bps, 2400 bps, or 300 bps.  
Voice  
Full-duplex speakerphone support with adjustable speaker volume control. Can  
record and play back answering machine messages using included microphone  
and speaker.  
Remote/ local telephone answering machine (TAM) capabilities include voice  
mail control, record and playback, and call screening.  
Supports AT#V voice commands.  
Supports DSVD digital simultaneous voice and data.  
8
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
1 Introduction  
W h a t Is in Yo u r M o d e m Pa ck a ge ?  
Your modem package has several components. Make sure you have them all before  
trying to operate your modem. Your package should include:  
• One MT5600DSVD modem  
One DC power supply  
One set of four plastic feet  
One modular telephone cable  
One headset (MT5600DSDV only)  
A printed Quick Start Guide  
A system CD containing modem drivers, the User Guide, PhoneTools (a data  
communications program), and Acrobat Reader.  
If any of these items are missing, please contact Multi-Tech Systems or your dealer/ dis-  
tributor (see Appendix D for information on contacting Multi-Tech via telephone, fax, or  
the Internet).  
Re la t e d M a n u a ls  
The following manuals are available from the Multi-Tech World Wide Web and FTP  
sites.  
82076200 MT56XX Fax Class 1 Developer’s Guide  
ftp://ftp.multitech.com/manuals/pdf/developers%20kits/5600fax.pdf  
82006502 Fax Class 2 Developers’s Kit  
ftp://ftp.multitech.com/manuals/pdf/developers%20kits/82006502.pdf  
9
Multi-Tech Systems, Inc.  
 
Ch a p t e r 2 -  
In s t a lla t io n  
 
MultiModemDSVD User Guide  
2 Installation  
In t r o d u ct io n  
This chapter shows step-by-step how to set up your MultiModemDSVD and  
configure your communications software to work with it.  
W h a t Yo u W ill Ne e d  
Before starting, please make sure you have everything you need:  
We supply  
An MT5600DSVD data/ fax/ voice modem  
A DC power supply module  
A set of four plastic feet  
A modular telephone cable  
A headset (MT5600DSDV only)  
A system CD containing drivers, a User Guide, Phone Tools (a data communica-  
tions program), and Acrobat Reader  
A printed Quick Start Guide  
You supply  
A computer with an unused serial port  
A shielded RS-232 serial cable with a male DB-25 connector on one end and a  
connector to match your computers serial port on the other end  
A nearby AC power outlet  
A nearby telephone line jack  
An optional PC stereo microphone (MT5600DSDV only)  
An optional amplified speaker or sound card with speakers (MT5600DSDV only)  
For connecting to a sound card, an optional male-to-male stereo patch cord with  
1/ 8-inch mini plugs (MT5600DSDV only)  
If you are new to computers, see Chapter 3, “Features,” for more information about  
the required equipment.  
Sa fe t y Wa r n in g s  
• Use this product only with UL- and CUL-listed computers.  
• To reduce the risk of fire, use only 26 AWG or larger telephone wiring.  
Never install telephone wiring during a lightning storm.  
Never install a telephone jack in a wet location unless the jack is specifically  
designed for wet locations.  
Never touch uninsulated telephone wires or terminals unless the telephone line  
has been disconnected at the network interface.  
Use caution when installing or modifying telephone lines.  
Avoid using a telephone during an electrical storm; there is a risk of electrical  
shock from lightning.  
Do not use a telephone in the vicinity of a gas leak.  
Multi-Tech Systems, Inc.  
11  
 
MultiModemDSVD User Guide  
2 Installation  
St e p 1: M o u n t t h e Fe e t  
The modem comes with a strip of self-adhesive plastic feet, which you can optional-  
ly mount on the bottom of the modem. To install the feet, simply peel them from  
their paper strip and press them into the recesses on the bottom of the modem.  
Figure 2-1. Mounting the feet.  
St e p 2: Ch a n ge t h e Sp ea ke r J u m p e r (MT5600DSDV on ly)  
This step is required only if you intend to connect a monophonic speaker to your mo-  
dem. (This step is not required for stereo speakers or for the included headset.) If  
you do not intend to connect a monophonic speaker to your modem, skip to Step 3.  
Warning: The following procedure must be performed by authorized service  
personnel.  
Caution: The circuit board can be harmed by static electricity. Before you open the  
case, touch a grounded object, such as the metal chassis of your computer, to discharge  
any static electricity in your body, then touch the metal shell of the modems RS232  
connector to ensure that there is no voltage difference between you and the modem.  
Opening the Modem  
1. If the modem is connected, turn it off and remove all connecting cables, including  
power and line cables.  
2. Turn the modem over.  
3. On the bottom of the modem are two screws that hold the case together. Remove  
both screws and set them aside.  
4. Turn the modem over again.  
5. Remove the top part of the modem case.  
6. To close the modem, reverse steps 1–5.  
Multi-Tech Systems, Inc.  
12  
 
MultiModemDSVD User Guide  
2 Installation  
J10 Speaker Mode  
Closed: stereo (default)  
Open: mono  
J10  
Figure 2-2. Location of speaker jumper. (MT5600DSDV only)  
Changing the Speaker Jumper  
The speaker jumper (J10) is behind the internal speaker near the external speaker  
jack (see Figure 2-2).  
• To use the MultiModemDSVD with a monophonic external speaker, remove the  
jumper plug from the J10 jumper pins. You can store it by placing it on one  
jumper pin.  
• To use the MultiModemDSVD with a stereo speaker or sound card, place the  
jumper plug on both pins of the J10 jumper. This is the factory default position.  
Multi-Tech Systems, Inc.  
13  
 
MultiModemDSVD User Guide  
2 Installation  
St e p 3: Co n n ec t t h e M o d e m t o Yo u r Sys t e m  
Placing the modem in a convenient location, connect it to your computers serial  
port, to the telephone line, to AC power, and, optionally, to your telephone. For  
voice operations, connect it to the supplied headset or, optionally, to a microphone  
and a speaker or sound card.  
Note: Do not turn on the modem until you have made all the connections.  
MT5600DSDV only  
PWR  
RS232  
PHONE LINE  
Figure 2-3. Modem connections.  
RS232 Connection  
Plug one end of the serial cable into the RS232 connector on the modem, and the oth-  
er end into a serial port connector on your computer, such as COM1 or COM2.  
Line Connection  
Plug one end of the phone cable into the modems LINE jack, and the other end into  
a phone line wall jack.  
Note: The LINE jack is not interchangeable with the PHONE jack. Do not plug the  
phone into the LINE jack or the line cable into the PHONE jack.  
Multi-Tech Systems, Inc.  
14  
 
MultiModemDSVD User Guide  
2 Installation  
Note: The Federal Communications Commission (FCC), Industry Canada, and other  
government agencies may impose certain restrictions on equipment connected to  
public telephone systems. For more information, see Appendix A.  
Phone Connection  
For voice-only calls, you can optionally plug a telephone into the modems PHONE  
jack.  
Microphone Connection (MT5600DSDV only)  
Plug the microphone plug of the supplied headset into the MIC jack on the side of  
the modem. Optionally, plug an unamplified microphone into the MIC jack. The mi-  
crophone should have a 1/ 8-inch mini plug.  
Speaker Connection (MT5600DSDV only)  
Plug the speaker plug of the supplied headset into the SPKR jack on the side of the  
modem. Optionally, use a 1/ 8-inch-plug male-to-male stereo patch cord to connect  
the SPKR jack on the side of the modem to the LINE IN jack on your sound card.  
If you do not have a sound card, you can plug an amplified speaker directly into the  
SPKR jack.  
Power Connection  
Plug the power supply module into an AC power outlet or power strip. Plug the  
power supplys cable into the PWR jack on the modem.  
Note: Use only the power supply supplied with the modem. Use of any other power  
supply will void the warranty and could damage the modem.  
Power-On Test  
Test the modem by turning it on (a power switch is located on the right side). When  
you apply power, the modem performs a diagnostic self-test, indicated by several  
indicators flashing for a second or two, after which the 56 indicator should light. If  
this does not happen, check that the power switch is on, the power supply is solidly  
connected, and the AC outlet is live. If these measures do not work, see Chapter 6,  
“Solving Problems.”  
Surge Protectors and Lightning  
Because of power surges and other transient voltages on power and telephone lines,  
we recommend that you plug the modem into a surge protector rather than directly  
into a wall outlet, preferably a surge protector that provides protection against elec-  
trical spikes on the telephone line as well as on the power line. Please note, however,  
that not even a surge protector can guard against damage from a nearby lightning  
strike.  
Multi-Tech Systems, Inc.  
15  
 
MultiModemDSVD User Guide  
2 Installation  
St e p 4 : In s t a ll t h e M o d e m Dr ive r  
If you use Windows 98, Windows Me, Windows NT 4.0, or Windows 2000, you must  
install the modem driver, which is installed using the Windows Plug and Play feature.  
Follow the four-step procedure below. The modem driver is used by Windows to con-  
trol the modem.  
Installing the Modem Driver  
1. Make sure your modem is connected properly, and then turn on your computer.  
Windows should detect your new modem and open the Install New Modem  
wizard.  
Note: If Windows cannot find a modem, your modem may not have power, it  
may be plugged into the wrong connector on your computer, or the serial cable  
may be faulty. See “None of the LEDs Light When the Modem Is Turned On” and  
“The Modem Does Not Respond to Commands” in Chapter 5, “Solving Problems.”  
2. Insert the MultiModemDSVD system CD into your CD-ROM drive, and then  
click OK.  
3. Windows installs and configures the modem.  
4. Click Finish to exit.  
For Windows NT, the Install New Modem wizard presents one additional prompt  
before Step 2. At this point, select Dont detect my modem; I will select it from a  
list, and then click Next. A dialog box with a list of manufacturers and a list of  
modem models appears. Select your modem. Continue with Step 2 above.  
Removing Your Old Modem Driver  
When your new modem replaces another modem, the old modem driver remains in  
Windows after you install the new modem, and the old modem is still selected in  
HyperTerminal and other Windows applications. Though you can change the appli-  
cation connection descriptions one at a time, it is easier to force Windows applications  
to use the new modem by removing the old modem from Windows.  
1. Click the Start button, point to Settings, and then click Control Panel.  
2. Double-click the Modems icon to open the Modems Properties dialog box.  
3. In the list box, select the old modem.  
4. Click Remove, and then click Close.  
5. The next time you dial a HyperTerminal connection, it will select your new mo-  
dem and ask you to confirm the selection.  
Multi-Tech Systems, Inc.  
16  
 
MultiModemDSVD User Guide  
2 Installation  
St e p 5: In s t a ll Ph o n e To o ls So ft w a r e  
Multi-Tech includes PhoneTools communications software with your modem.  
However, the modem will work with most data communications software. To install  
PhoneTools, insert the MultiModemDSVD system CD into your CD-ROM drive;  
click the PhoneTools icon. You will be asked to choose your language. The software  
will then automatically load onto your PC.  
Communication programs designed for Windows 98/ Me and Windows NT/ 2000  
normally do not need to be manually configured, since they use the Plug and Play  
configuration supplied by the Windows modem driver. Though each  
communication program is different, the following procedure should work with most  
of them.  
Multi-Tech Systems, Inc.  
17  
 
Ch a p t e r 3 - O p e r a t io n  
 
MultiModemDSVD User Guide  
3 Operation  
In t r o d u ct io n  
Like any modem, your MultiModemDSVD operates only under the control of a  
communication program, such as the one included with the modem. It also operates  
under other general-purpose data communication programs, such as Windows  
Terminal and HyperTerminal. For information on how to use the modem with the  
communication program of your choice, please refer to the programs  
documentation.  
Unlike other modems, with the MultiModemDSVD you can also simultaneously  
send voice and data over a single phone line or, using third-party white-board  
software, work on a document with someone at another location.  
Fr o n t Pa n e l  
Figure 3-1. Front panel  
The MultiModemDSVD has ten LED indicators on the front panel that indicate  
status, configuration, and activity:  
TD Transmit Data. The TD LED flashes when the modem is transmitting data to  
another modem. The state of the LED matches the TD circuit on pin 2 of the  
RS-232C/ V.24 interface.  
Receive Data. The RD LED flashes when the modem is receiving data from  
another modem. The state of the LED matches that of the RD circuit on pin 3 of  
the RS-232C/ V.24 interface.  
RD  
CD  
56  
Carrier Detect. The CD LED lights when the modem detects a valid carrier  
signal from another modem. It is on when the modem is communicating with  
the other modem and off when the link is broken.  
56K Mode (56,000–28,000 bps). The 56 LED lights whenever the modem  
nects to an ISP server in K56flex or V.90 mode. The actual connection speed  
depends on server capabilities and line conditions.  
con  
33 V.34 Mode (33,600–16,800 bps). The 33 LED lights whenever the modem  
nects in V.34 mode.  
con  
V.32bis Mode (14,400 bps–). The 14 LED lights whenever the modem connects  
14  
in V.32bis mode.  
Note: Although the modem can connect at lower than V.32bis speeds, no speed  
indicator lights during the connection.  
Multi-Tech Systems, Inc.  
19  
 
MultiModemDSVD User Guide  
3 Operation  
OH Off-Hook. The OH LED lights when the modem is off-hook, which occurs  
when the modem is dialing, online, or answering a call. The LED flashes when  
the modem pulse-dials.  
Terminal Ready. The TR LED lights when a datacomm program initializes the  
modem. It means the modem is ready for an outgoing or incoming call. It goes  
off when the datacomm program disconnects the COM port. When it goes off, a  
connected modem will disconnect. The state of the TR LED matches that of the  
DTR circuit on pin 20 of the RS-232C/ V.24 interface.  
TR  
Error Correction (V.42). The EC LED lights continuously when the modem is in  
V.42 error correction mode, and blinks when compression is activated.  
EC  
FX  
Fax. The FX LED lights when the modem is in fax mode.  
Note: When you turn on the modem, the speed lights flash briefly as the modem  
does a self-test, then the LED for the default modem baud rate lights. The default  
rate for the modem is 56K bps. After a call, the LEDs for the connections baud rate  
remain lit until another call is made or the modem is reset. If you connect at a rate  
under 14,400 bps, all speed LEDs remain off after the connection is broken, even  
though the modem is still turned on.  
Co n f ig u r in g t h e M o d e m  
Your modem normally is configured either through Windows or through the  
communication program you are using. The default settings work best for most  
purposes. See “Step 5: Install and Configure Your Software” in Chapter 2 for help in  
setting up your communication program.  
You can also configure your modem directly by typing AT commands in the  
terminal window of a communication program. See Chapter 4 for descriptions of the  
modems AT commands.  
Co n n ec t in g t o t h e In t e r n e t  
Your Multi-Tech modem is your gateway to the Internet and the World Wide Web.  
To access the Internet and Web via your modem, you must establish a dial-up  
account with an Internet service provider (ISP). To locate an ISP near you, look in a  
local directory or computer publication. Your ISP should provide you with the  
following information:  
• User name (also called user ID)  
• Password  
• Access number (the number you call to connect to the server)  
Host name and/ or domain name  
• Domain Name Server (DNS) server address  
If, besides the Web, you use the Internet for e-mail and newsgroups, your ISP should  
also provide you with the following information:  
• E-mail or POP mail address  
• POP server address  
• Mail or SMTP address  
News or NNT server address  
Multi-Tech Systems, Inc.  
20  
 
MultiModemDSVD User Guide  
3 Operation  
Dia l-Up Ne t w o r k in g  
Whether you use the Internet for e-mail or for browsing the Web, to connect to it  
through your modem, you must first set up a remote-node client program. The one  
in Windows 95, 98, Me, NT 4.0, and 2000 is called Dial-Up Networking. Dial-Up  
Networking establishes your connection to the ISPs server, which is the shared com-  
puter that manages calls from clients (your computer) to the Internet. Most, if not all,  
Windows browsers start Dial-Up Networking automatically when you open them.  
Dial-Up Networking in Windows 95/98  
To install and run Dial-Up Networking in Windows 95 or 98  
Install a NetWare client or Client for Microsoft Networks on the client computer.  
Microsoft Client for Netware Networks, Microsoft Client for Microsoft Networks,  
and two Novell Netware clients are included with Windows 95/ 98.  
1. Insert the Windows compact disc into the CD-ROM drive.  
2. In Windows, click the Start button, and then select Settings, Control Panel, and  
Add/ Remove Programs.  
3. Click the Windows Setup tab.  
4. Check Communications in the Components list.  
5. Click the Details button.  
6. Check Dial-up Networking in the Components list.  
7. Click OK. Dial-Up Networking is installed from the Windows compact disc.  
8. When the installation is complete, reboot the computer.  
To create a connection entry  
1. Double-click the My Computer icon.  
2. Double-click the Dial-Up Networking icon.  
3. Double-click the Make New Connection icon, and follow the directions in the  
wizard to create a connection entry.  
To dial your Internet access provider  
1. Double-click the My Computer icon.  
2. Double-click the Dial-Up Networking icon.  
3. Double-click the icon with your ISP’s name.  
4. Type your name and password if they are not already entered.  
5. Click Connect.  
6. Follow the instructions provided by your ISP for browsing the the Internet,  
reading e-mail, and accessing information.  
For further information on Dial-Up Networking or Microsoft Client for NetWare  
Networks, see Windows Help.  
Multi-Tech Systems, Inc.  
21  
 
MultiModemDSVD User Guide  
3 Operation  
Dial-Up Networking in Windows Me  
To install Dial-Up Networking  
Dial-Up Networking is automatically installed with Windows Me.  
To create a connection entry  
1. Click Start, point to Programs, point to Accessories, point to Communications,  
and then click Internet Connection Wizard.  
2. Click I want to sign up for a new Internet account, and then click Next.  
3. Follow the instructions for setting up your dial-up properties and detecting your  
modem.  
To dial your Internet access provider  
1. Click Start, point to Settings, and then click Control Panel.  
2. Double-click the Dial-Up Networking icon.  
3. Double-click the icon with your ISP’s name.  
4. Follow the instructions provided by your ISP for browsing the the Internet,  
reading e-mail, and accessing information.  
For further information on Dial-Up Networking, see Windows Me Help.  
Dial-Up Networking in Windows NT 4.0  
To install Dial-Up Networking  
1. Double-click the My Computer icon, and then double-click the Dial-Up Net-  
working icon. If Dial-Up Networking is not installed, you will see an Install  
button in the Dial-Up Networking dialog box.  
2. Insert the Windows NT 4.0 compact disc into the CD-ROM drive.  
3. Click Install in the Dial-Up Networking dialog box.  
4. In the Add RAS Device dialog box, choose the modem to use with Dial-Up Net-  
working, and then click OK.  
5. In the Remote Access Setup dialog box, click Configure.  
6. In the Configure Port Usage dialog box, click Dial out only, and then click OK.  
7. In the Remote Access Setup dialog box, click Network.  
8. In the Network Configuration dialog box, make sure that only TCP/IP is select-  
ed, and then click OK.  
9. If there is a network interface card that does not have TCP/ IP bound to it, the  
Microsoft TCP/ IP Properties window appears. Click Cancel to close the window.  
10. Click Continue, and then click Restart to finish the installation.  
11. When the installation is complete, reboot the computer.  
Multi-Tech Systems, Inc.  
22  
 
MultiModemDSVD User Guide  
3 Operation  
To create a connection entry  
1. Double-click the My Computer icon, and then double-click the Dial-Up Net-  
working icon.  
2. In the Dial-Up Networking dialog box, click the New button.  
3. In the New Phonebook Entry wizard, follow the directions to create a connec-  
tion entry.  
To dial your Internet access provider  
1. Double-click the My Computer icon.  
2. Double-click the Dial-Up Networking icon.  
3. Click the connection in Phonebook entry to dial.  
4. Click Dial.  
5. Follow the instructions provided by your ISP for browsing the the Internet,  
reading e-mail, and accessing information.  
For further information on Dial-Up Networking, see Windows NT Help.  
Dial-Up Networking in Windows 2000  
To install Dial-Up Networking  
Dial-Up Networking is automatically installed with Windows 2000.  
To create a connection entry  
1. Select Start | Settings | Network and Dial-up Connections.  
2. Double-click Make New Connection, and then click Next.  
3. Click Dial-up to the Internet, click Next, and then follow the instructions in the  
Network Connection wizard.  
To dial your Internet access provider  
1. Select Start | Settings | Network and Dial-up Connections.  
2. Double-click the icon with your ISP’s name.  
3. Follow the instructions provided by your ISP for browsing the the Internet,  
reading e-mail, and accessing information.  
For further information on Dial-Up Networking, see Windows 2000 Help.  
Multi-Tech Systems, Inc.  
23  
 
MultiModemDSVD User Guide  
3 Operation  
Fa x O p e r a t io n  
Using the PhoneTools program included with your modem, you can use your modem to  
send and receive faxes directly from your computer. The following procedure uses print  
capture, which enables you to fax a document directly from the Windows applica-  
tion in which you created it without opening PhoneTools.  
1. Create a document in a Windows application, such as a word processor, graphic  
editor, or spreadsheet. To fax the document, keep the application and the docu-  
ment open and select the Print command from the File menu.  
2. Select CAPTURE FAX BVRP as the printer driver, and then click OK. The Send  
Fax wizard appears.  
3. In the Recipient section, type the required information or extract it from the  
Phone Book by clicking  
.
4. In the Template section, optionally select a cover page and type a cover message.  
5. Select the document to be sent. The default file when sending from within a Win-  
dows application is Capture.dgr.  
6. Select the date and time to send the document, if you do not want to send it  
immediately.  
7. Click Finish to start the transmission.  
Vo ice O p e r a t io n  
Operation in DSVD mode allows data transfer and voice conversation to occur si-  
multaneously during a data connection. On a DSVD call, a headset or microphone  
and speaker can be used as the voice interface. Both local and remote modems must  
have compatible DSVD technology to support the DSVD function. DSVD can be  
used by running a communications application that supports DSVD. Follow the ap-  
plication instructions. DSVD can also be controlled manually issuing AT commands  
to the modem as described in the following sections.  
To Originate a Voice Call in Speakerphone Mode  
1. In the terminal window of your communications application, type AT and press  
ENTER. The modem will respond with OK.  
2. Type AT&F and press ENTER to reset the modem to its default configuration.  
3. Type AT#CLS=8#VRN=0#VLS=6 and press ENTER to initialize the modem for  
speakerphone mode.  
4. To dial, type ATDTnnnnnnn and press ENTER, where nnnnnnn is the phone num-  
ber of a remote party. The modem will report VCON at the completion of dialing  
to indicate the speakerphone is on.  
5. To hang up, type +++ATH and press ENTER.  
Multi-Tech Systems, Inc.  
24  
 
MultiModemDSVD User Guide  
3 Operation  
To Answer a Voice Call in Speakerphone Mode  
1. In the terminal window of your communications application, type AT and press  
ENTER. The modem will respond with OK.  
2. Type AT&F and press ENTER to reset the modem to its default configuration.  
3. Type AT#CLS=8#VRN=0#VLS=6S0=0 and press ENTER to initialize the modem  
for speakerphone mode.  
4. To answer a call in speakerphone mode upon receipt of a RING message, type  
ATA and press ENTER. The modem will report VCON to indicate the speaker-  
phone is on.  
5. To hang up, type ATH and press ENTER.  
To Originate a DSVD Call Using the Headset (MT5600DSDV only)  
1. In the terminal window of your communications application, type AT and press  
ENTER. The modem will respond with OK.  
2. Type AT&F and press ENTER to reset the modem to its default configuration.  
3. Type AT-SMS=1#VLS=5 and press ENTER to enable DSVD mode using the head-  
set.  
4. To dial, type ATDTnnnnnnn and press ENTER, where nnnnnnn is the phone num-  
ber of a remote modem.  
5. You will hear some high pitched tones, then a static-like sound after the remote  
modem picks up your call. You will see a CONNECT response on your terminal.  
You can then send data to the remote modem and talk to the remote user by  
speaking into the microphone  
6. To hang up, type +++ATH and press ENTER.  
Note: If DSVD is enabled, the modems will not connect if the V.34 connect rate is  
below 12000 bps. The voice link is not maintained in data mode, so if +++ is  
typed and the user goes back to data mode, a simulated busy is played to both  
modems to tell the users to place their handsets on hook. If you get an ERROR  
message when dialing or answering a call, check to make sure the lines are not in  
the wrong jacks. A DSVD data connection is terminated by dropping DTR (if en-  
abled by &D2) or by issuing +++ATH.  
Multi-Tech Systems, Inc.  
25  
 
MultiModemDSVD User Guide  
3 Operation  
To Answer a DSVD Call Using the Headset (MT5600DSDV only)  
1. In the terminal window of your communications application, type AT and press  
ENTER. The modem will respond with OK.  
2. Type AT&F and press ENTER to reset the modem to its default configuration.  
3. Type AT-SMS=1#VLS=5 and press ENTER to enable DSVD mode using the headset.  
4. When the modem responds by displaying RING on the screen, type ATA and  
press ENTER to answer the call.  
5. You will hear some high pitched tones, then a static-like sound after the remote  
modem picks up your call. You will see a CONNECT response on your terminal.  
You can then send data to the remote modem and talk to the remote user by  
speaking into the microphone  
6. To hang up, type +++ATH and press ENTER.  
Multi-Tech Systems, Inc.  
26  
 
Ch a p t e r 4 - AT  
Co m m a n d s  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
AT Co m m a n d s  
AT commands are used to control the operation of your modem. They are so called  
because each command must be preceded by the characters AT to get the ATtention  
of the modem.  
AT commands can be issued only when the modem is in command mode or online  
command mode. The modem is in command mode whenever it is not connected to  
another modem. The modem is in data mode whenever it is connected to another mo-  
dem and ready to exchange data. Online command mode is a temporary state in which  
you can issue commands to the modem while connected to another modem. To put  
the modem into online command mode from data mode, you must issue an escape  
sequence (+++) followed immediately by the AT characters and the command, e.g.,  
+++ATH to hang up the modem. To return to data mode from online command  
mode, you must issue the command ATO.  
To send AT commands to the modem you must use a communications program,  
such as the HyperTerminal applet in Windows 95 and NT 4.0, or the Trio communi-  
cations program included with your modem. You can issue commands to the mo-  
dem either directly, by typing them in the terminal window of the communications  
program, or indirectly, by configuring the operating system or communications pro-  
gram to send the commands automatically. Fortunately, communications programs  
make daily operation of modems effortless by hiding the commands from the user.  
Most users, therefore, need to use AT commands only when reconfiguring the mo-  
dem, e.g., to turn autoanswer on or off.  
The format for entering an AT command is ATXn, where X is the command and n is  
the value for the command, sometimes called the command parameter. The value is  
always a number. If the value is zero, you can omit it from the command; thus,  
AT&W is equivalent to AT&W0. Most commands have a default value, which is the  
value that is set at the factory. The default values are shown in the “AT Command  
Summary,” which begins on the next page.  
You must press ENTER to send the command to the modem. Any time the modem  
receives a command, it sends a response known as a result code. The most common  
result codes are OK, ERROR, and the CONNECT messages that the modem sends to  
the computer when it is connecting to another modem. For a table of valid result  
codes, see “Result Codes” at the end of this chapter.  
You can issue several commands in one line, in what is called a command string. The  
command string begins with AT and ends when you press ENTER. Spaces to sepa-  
rate the commands are optional; they are ignored by the command interpreter. The  
most familiar command string is the initialization string, which is used to configure  
the modem when it is turned on or reset, or when your communications software  
calls another modem.  
Multi-Tech Systems, Inc.  
28  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
AT Co m m a n d Su m m a r y  
Command:  
Values:  
AT  
Attention Code  
n/ a  
Description:  
The attention code precedes all command lines except A/ and  
the escape sequence.  
Command:  
Values:  
ENTER Key  
n/ a  
Description:  
Press the ENTER or RETURN key to execute most commands.  
Command:  
Values:  
A
Answer  
n/ a  
Description:  
Answers an incoming call before the final ring.  
Command:  
Values:  
A/  
Repeat Last Command  
n/ a  
Description:  
Repeats the last command string. Do not precede this com-  
mand with AT. Do not press ENTER to execute.  
Command:  
Values:  
Bn  
Communication Standard Setting  
n = 0 or 1  
Default:  
1
Description: B0  
B1  
Selects ITU-T V.22 mode when the modem is at 300 or 1200 bps.  
Selects Bell 212A when the modem is at 300 or 1200 bps.  
Command:  
Values:  
Cn  
Carrier Control  
n = 1  
Default:  
1
Description: C0  
C1  
Transmit carrier always off. (Not supported.)  
Normal transmit carrier switching (included for backward  
compatibility with some software).  
Command:  
Values:  
Default:  
Ds  
Dial  
s = dial string (phone number and dial modifiers)  
none  
Description:  
Dials telephone number s, where s may up to 40 characters  
long and include the following dial string modifiers.  
0–9 Digits 0 through 9  
*
#
The “star” digit (tone dialing only)  
The “pound” digit (tone dialing only)  
A–D A, B, C, and D tone digits. Country specific; some countries  
may prohibit these digits.  
L
P
Redial last number. (Must be placed immediately after ATD.)  
Select pulse-dialing until a T is encountered. Affects current  
and subsequent dialing.  
T
Select tone-dialing until a P is encountered. Affects current  
and subsequent dialing.  
W Wait for a new dial tone before continuing to dial. (X2 or X4  
must be selected.)  
,
Pause during dialing for time set in register S8.  
Multi-Tech Systems, Inc.  
29  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
;
Return to command mode after dialing. (Place at end of dial  
string.)  
!
Hook flash. Causes the modem to go on-hook for the time  
specified in S29, then off-hook again .  
@ Wait for silence. Causes the modem to wait for 5 seconds of  
silence before processing the next part of the command. If  
silence is not detected within the time set in register S7, the  
modem returns a NO ANSWER or BUSY code.  
^
Toggle data calling tone on or off. Applies only to current  
dialing attempt.  
& Detect credit card “bong” tone. If the tone is not detected  
within the time specified by S7 (US models), the modem  
aborts the rest of the sequence and hangs up. The character  
should follow the phone number and precede the users call  
card number, e.g., ATDT1028806127853500&123456789.  
Command:  
Values:  
DS=y Dial Stored Telephone Number  
n = 0–3  
Default:  
none  
Description:  
Dial a number previously stored in directory number y by the  
&Zy=x command. Example: ATDS=3.  
Command:  
Values:  
En  
Echo Command Mode Characters  
n = 0 or 1  
Default:  
1
Description: E0  
E1  
Do not echo keyboard input to the terminal.  
Do echo keyboard input to the terminal.  
Command:  
Values:  
Hn  
Hook Control  
n = 0 or 1  
Default:  
0
Description: H0  
Go on-hook (hang up) and terminate any &T test that is in  
progress.  
H1  
Go off-hook (make the phone line busy) and enter command mode.  
Command:  
Values:  
In  
Information Request  
n = 0–6  
Default:  
None  
Description: I0  
I1  
Display the product code. Example: MT5600DSVD.  
Calculate the ROM checksum and display the least significant  
byte in decimal format.  
I2  
I3  
Calculate the ROM checksum and compare it to the prestored  
checksum, displaying OK if they match, or ERROR if they do not.  
Display the controller firmware version (F), the basic model (V90),  
the application code (A), and the interface type code (I) in the for-  
mat VF.FFF-V90_AI. The application codes are D for desktop and  
L for low power (PCMCIA). The interface codes are S for serial  
and P for parallel. Example: V2.210-V90_DS  
Display the OEM-defined identifier string in either binary or  
ASCII format.  
I4  
I5  
I6  
Display the country code. Example: 022.  
Display the modem data pump model and internal code version.  
Example: RCV56DPF-PLL L8571A Rev 29.00/29.00.  
Multi-Tech Systems, Inc.  
30  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command:  
Values:  
Ln  
Monitor Speaker Volume  
n = 0, 1, 2, or 3  
Default:  
1
Description: L0  
Select low volume.  
Select low volume.  
Select medium volume.  
Select high volume.  
L1  
L2  
L3  
Note: Use the M command to turn the speaker on or off.  
Command:  
Value:  
L5  
Display Legacy Parameters  
5
Default:  
None  
Description:  
Displays the current values for the error correction, flow  
control, data compression, and serial port speed commands.  
Example:  
atl5  
&E2 &E3 &E15 $SB115200  
OK  
Note: Use the &V command to display the other parameters.  
Command:  
Values:  
Mn  
Monitor Speaker Mode  
n = 0, 1, 2, or 3  
Default:  
1
Description: M0  
Speaker is always off.  
M1  
M2  
M3  
Speaker is on until the carrier signal is detected.  
Speaker is always on when the modem is off-hook.  
Speaker is off when receiving carrier and during dialing, but  
on during answering.  
Command:  
Values:  
Nn  
Modulation Handshake  
n = 0 or 1  
Default:  
1
Description: N0  
N1  
Disables automode. The modem attempts a handshake at the  
speed set by S37 or, if S37=0, at the most recently sensed serial  
port speed.  
Enables automode. The modem attempts a handshake at the  
speed set by S37 or, if S37=0, at the highest possible speed.  
During the handshake, fallback to a lower speed can occur.  
Note: Setting the N command automatically sets the <automode>  
parameter of the +MS command. N and S37 are provided only  
for compatibility with existing software. +MS is the recom-  
mended command.  
Multi-Tech Systems, Inc.  
31  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command:  
Values:  
On  
Return Online to Data Mode  
0 or 1  
Default:  
None  
Description: O0  
O1  
Exit online command mode and return to online data mode  
without a retrain. Normally used after a +++ escape (see  
+++AT<CR> escape sequence).  
Exit online command mode and return to online data mode  
after a retrain.  
Command:  
Values:  
P
Pulse Dialing  
P, T  
Default:  
T
Description:  
Forces pulse (non-touch-tone) dialing until a T command or  
dial modifier is received.  
Command:  
Values:  
Qn  
Result Codes Enable/Disable  
n = 0 or 1  
Default:  
0
Description: Q0  
Q1  
Enable result codes.  
Disable result codes.  
Command:  
Values:  
Sr  
Select Register  
r = S-register number  
Default:  
None  
Description:  
Selects register Sr as the last register accessed. E.g., S0. The  
command AT? can then be used to read the register, and the  
command AT=n can then be used to set the register to value n.  
Command:  
Values:  
Sr=n Set Register Value  
r = S-register number; n varies  
Default:  
None  
Description:  
Set value of register Sr to n, where n is entered in decimal for-  
mat. E.g., S0=1. If the short form AT=n is used, the value is  
written to the last accessed S-register.  
Command:  
Values:  
Sr? Read Register Value  
r = S-register number  
Default:  
None  
Description:  
Read value of register Sr and display it in 3-digit decimal for-  
mat. E.g., S2? gives the response 043. If the short form AT? is  
used, the last accessed S-register is read.  
Command:  
Values:  
T
Tone Dialing  
P, T  
Default:  
T
Description:  
Forces DTMF (touch-tone) dialing until a P command or P dial  
modifier is received.  
Command:  
Values:  
Vn  
Result Code Format  
n = 0 or 1  
Default:  
1
Description: V0  
V1  
Displays result codes as digits (terse response).  
Displays result codes as words (verbose response).  
Multi-Tech Systems, Inc.  
32  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command:  
Values:  
Wn Connect Message Control  
n = 0, 1, or 2  
Default:  
0
Description: W0 The CONNECT result code reports the serial port speed only.  
W1 The CONNECT result code reports the line speed, the error  
correction protocol, and the serial port speed, respectively.  
W2 The CONNECT result code reports the line speed only.  
Note: See also the \ V command  
Command:  
Values:  
Xn  
Result Code Selection  
n = 0–4  
Default:  
4
Description:  
This command selects which subset of the result messages will  
be used by the modem to inform the computer of the results of  
commands.  
X0  
X1  
X2  
Sends OK, CONNECT, RING, NO CARRIER, ERROR and NO  
ANSWER; does not look for dial tone or busy signal.  
Sends X0 messages and connect speed; does not look for dial  
tone or busy signal.  
Sends X1 messages with NO DIALTONE; does not look for  
busy signal.  
X3  
X4  
Sends X1 messages with BUSY; does not look for dial tone.  
Sends all messages, including NO DIALTONE and BUSY.  
Note: If the modem is in fax mode, the only message sent to  
indicate a connection is CONNECT without a speed indication.  
See also the \ V command.  
Command:  
Values:  
Yn  
Long Space Disconnect  
n = 0 or 1  
Default:  
0
Description: Y0  
Y1  
Disable sending or responding to long space break signal on  
disconnect.  
Enables long space disconnect. In non-error correction mode,  
the modem sends a long space of four seconds prior to going  
on-hook. In non-error correction mode, the modem responds  
to the receipt of a long space (i.e., a break signal greater than  
1.6 seconds) by going on-hook.  
Command:  
Values:  
Zn  
Modem Reset  
n = 0 or 1  
Default:  
None  
Description:  
The modem performs a soft reset and restores (recalls) the con-  
figuration profile according to the parameter supplied. If no  
parameter is specified, zero is assumed.  
Reset modem to profile saved by the last &W command (pro-  
file 0).  
Z0  
Z1  
Reset modem and restore stored profile 1.  
Note: See also the &F and &W commands.  
Multi-Tech Systems, Inc.  
33  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command:  
Values:  
&Cn Data Carrier Detect (DCD) Control  
n = 0 or 1  
Default:  
1
Description: &C0 Forces the DCD circuit to always be high.  
&C1 DCD goes high when the remote modems carrier signal is de-  
tected, and goes low when the carrier signal is not detected.  
Command:  
Values:  
&Dn Data Terminal Ready (DTR) Control  
n = 0, 1, 2, or 3  
Default:  
2
Description:  
This command interprets the high to low transition of the DTR  
signal from the computer according to the supplied parameter.  
The action taken depends on the current &Q setting.  
&D0 &Q0, &Q5, &Q6: DTR is ignored (assumed high). Allows op-  
eration with computers that do not provide DTR.  
&D1 &Q0, &Q5, &Q6: DTR drop is interpreted by the modem as if  
the asynchronous escape sequence had been entered. The mo-  
dem returns to asynchronous command state without discon-  
necting.  
&D2 &Q0&Q6: DTR drop causes the modem to hang up. Autoan-  
swer is inhibited.  
&D3 &Q0, &Q5, &Q6: DTR drop causes the modem to perform a  
soft reset as if the Z command were received. The &Y setting de-  
termines which profile is loaded.  
&Q5 or &Q6 and +FCLASS=1 or +FCLASS=2: Same as for &Q0.  
Note: If &D1, &D2, or &D3 is set, the modem will not dial  
without a DTR drop.  
Command:  
Values:  
&En V.42 Error Correction Modes  
n = 0, 1, or 2  
Default:  
1
Description: &E0 V.42 non-error correction mode (V.42 disabled).  
&E1 V.42 auto-reliable mode.  
&E2 V.42 reliable mode (V.42 enabled).  
Command:  
Values:  
&En Modem-Initiated Flow Control  
n = 3, 4, or 5  
Default:  
4
Description: &E3 Flow control disabled.  
&E4 CTS/ RTS hardware flow control.  
&E5 XON/ XOFF software flow control.  
Note: See also the L5 and &K commands.  
Multi-Tech Systems, Inc.  
34  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command:  
Values:  
&En V.42bis Data Compression  
n = 14 or 15  
Default:  
15  
Description: &E14 V.42bis data compression disabled.  
&E15 V.42bis data compression enabled.  
Note: This command controls only V.42bis data compression,  
whereas the %C command controls both V.42bis and MNP-5  
data compression. The command in effect is the one last en-  
tered. See also the L5 command.  
Command:  
Values:  
&Fn Load Factory Settings  
n = 0 or 1  
Default:  
None  
Description: &F0 Load factory configuration 0.  
&F1 Load factory configuration 1.  
Note: See also the Z, L5, and &V commands.  
Command:  
Values:  
&Gn V.22bis Guard Tone Control  
n = 0, 1, or 2  
Default:  
0
Description: &G0 Disable guard tone.  
&G1 Set guard tone to 550 Hz.  
&G2 Set guard tone to 1800 Hz.  
Note: The &G command is not used in North America, and  
may not be permitted in some countries.  
Command:  
Values:  
&Jn Telephone Jack Control  
n = 0 or 1  
Default:  
None  
Description: &J0 NA  
&J1 NA  
Note: This command is included only for backwards compati-  
bility. It performs no function except to load the S-register. The  
parameter value, if valid, is written to S21 bit 1.  
Command:  
Values:  
&Kn Flow Control Selection  
n = 0, 3, 4, 5, or 6  
Defaults:  
3 (data modem mode)  
6 (fax modem and voice modes)  
Description: &K0 Disables flow control.  
&K3 Enables CTS/ RTS hardware flow control.  
&K4 Enables XON/ XOFF software flow control.  
&K5 Enables transparent XON/ XOFF flow control.  
&K6 Enables both RTS/ CTS and XON/ XOFF flow control.  
Note: See also the &E command  
Multi-Tech Systems, Inc.  
35  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command:  
Values:  
&Mn Communications Mode  
n = 0  
Default:  
0
Description:  
This command determines the DTR operating mode. The mo-  
dem treats the &M command as a subset of the &Q command.  
&M0 Selects direct asynchronous operation. Note that the command  
sequence &M0\ N0 selects normal buffered mode, but the  
command sequence \ N0&M0 selects direct mode. This is be-  
cause the \ N0 command is analogous to the &Q6 command.  
Command:  
Values:  
Default:  
&Pn Pulse Dial Make/Break Ratio  
n = 0  
0
Description: &P0 Selects a make/ break dial ratio of 39:61 at 10 pulses per sec-  
ond.  
Command:  
Values:  
&Qn Asynchronous Communications Mode  
n = 0, 5, 6  
Default:  
5
Description:  
This command is an extension of the &M command, and is used  
to control which connection modes are permitted. It is used in  
conjunction with S36 and S48. (See also the \ N command.)  
&Q0 Selects direct asynchronous operation. See &M0.  
&Q5 The modem will try to negotiate an error-corrected link. The  
modem can be configured using S36 to determine whether a  
failure will result in the modem disconnecting or falling back  
to a non-error-correction connection. See also \ N3.  
&Q6 Selects asynchronous operation with speed buffering and no  
error correction. Same as \ N0.  
Command:  
Values:  
&Sn Data Set Ready (DSR) Control  
n = 0 or 1  
Default:  
0
Description: &S0 Force DSR high (on) at all times.  
&S1 Let DSR go high only during a connection.  
Command:  
Values:  
&Tn V.54 Test Commands  
n = 0, 1, 3, 4, 5, 6, 7, or 8  
Default:  
None  
Description:  
The modem can perform selected test and diagnostic functions.  
A test can be run only when the modem is in asynchronous  
operation in non-error-correction mode (normal or direct mode).  
For tests 3, 6, and 7, a connection between the two modems  
must first be established. To terminate a test in progress, the  
escape sequence (+++) must be entered first, except for param-  
eters 7 and 8. If S18 is non-zero, a test terminates automatically  
after the time specified by S18 and displays the OK message.  
&T0 Abort. Stop any test in progress.  
&T1 Start local analog loopback, V.54 Loop 3. If a connection exists  
when this command is issued, the modem hangs up. The CON-  
NECT XXXX message is displayed upon the start of the test.  
Multi-Tech Systems, Inc.  
36  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
&T3 Start local digital loopback, V.54 Loop 2. If no connection ex-  
ists, ERROR is returned.  
&T4 Enables acknowledgment for remote digital loopback request.  
&T5 Ignores acknowledgment for remote digital loopback request.  
&T6 Requests a remote digital loopback, V.54 Loop 2, without self-  
test. If no connection exists, ERROR is returned. The CON-  
NECT XXXX message is displayed upon the start of the test.  
&T7 Requests a remote digital loopback, V.54 Loop 2, with self test.  
(In self test, a test pattern is looped back and checked by the  
modem..) If no connection exists, ERROR is returned. When  
the test is terminated, the number of detected errors is re-  
ported to the computer.  
&T8 Starts local analog loopback, V.54 Loop 3, with self test. If a  
connection exists, the modem hangs up before the test begins.  
When the test is terminated, the number of detected errors is  
reported to the computer.  
Command:  
Values:  
&V0 Display Current Configuration  
0
Default:  
None  
Description:  
Displays the current (active) configuration.  
Note: See also the L5 command.  
Command:  
Values:  
&V1 Display Last Connection Statistics  
1
Default:  
None  
Description:  
Displays statistics for the last connection.  
Command:  
Values:  
&Wn Store Current Configuration  
n = 0 or 1  
Default:  
None  
Description: &W0 Stores current modem settings in nonvolatile memory as Profile 0.  
Profile 0 is loaded instead of the factory defaults at power-on  
(if &Y0 is set) and by the ATZ command.  
&W1 Stores current modem settings in nonvolatile memory as Profile 1.  
Profile 1 is loaded instead of the factory defaults at power-on  
(if &Y1 is set) and by the ATZ1 command.  
Note: See also the Z, &F, and &Y commands.  
Command:  
Values:  
&Yn Select Profile for Hard Reset  
n = 0 or 1  
Default:  
None  
Description: &Y0 Select profile 0 to be loaded on power-up.  
&Y1 Select profile 1 to be loaded on power-up.  
Note: See also the &W and Z commands.  
Multi-Tech Systems, Inc.  
37  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command: &Zy=x Store Telephone Number  
Values:  
y = 0–3  
x = Dialing command  
Default:  
None  
Description:  
Stores telephone dial string x in memory location y. Each tele-  
phone number dial string can contain up to 34 digits. Dial the  
stored number using the command ATDS=y.  
Note: DTR dialing uses the number stored in memory location 0.  
Command:  
Values:  
%Cn Data Compression Control  
n = 0, 1, 2, or 3  
Default:  
3
Description:  
Enables or disables data compression negotiation. The modem  
can only perform data compression on an error-corrected link.  
%C0 Disables data compression.  
%C1 Enables MNP 5 data compression negotiation.  
%C2 Enables V.42bis data compression negotiation.  
%C3 Enables both V.42bis and MNP 5 data compression negotiation.  
Note: This command controls both V.42bis and MNP-5 data  
compression, whereas the &E14 and &E15 commands control  
only V.42bis data compression. The command in effect is the  
one last entered.  
Command:  
Values:  
%En Line Quality Monitor  
n = 0, 1, or 2  
Default:  
2
Description:  
Controls whether or not the modem will automatically moni-  
tor the line quality and request a retrain (%E1) or fall back to a  
lower speed when line quality is insufficient and fall forward  
to a faster speed when line quality is sufficient (%E2).  
%E0 Disable line quality monitor and auto-retrain.  
%E1 Enable line quality monitor and auto-retrain.  
%E2 Enable line quality monitor and fallback/ fall forward.  
Command:  
Values:  
Default:  
%L Line Signal Level  
None  
None  
Description: %L  
Returns a value that indicates the received signal level. The  
value returned is a direct indication (DAA-dependent) of the  
receive level at the MDP, not at the telephone line connector.  
For example, 009 = -9 dBm, 043 = -43 dBm, and so on.  
Command:  
Values:  
Default:  
%Q Line Signal Quality  
None  
None  
Description: %Q Reports the line signal quality (DAA-dependent) as a three-  
digit number. Returns the higher order byte of the EQM value.  
Based on the EQM value, retrain or fallback/ fall forward may  
be initiated if enabled by %E1 or %E2.  
Multi-Tech Systems, Inc.  
38  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command:  
Values:  
%U PCM Code Selection  
n = 0 or 1  
Default:  
0
Description:  
Specifies the PCM code type for 56K modulation. Note, how-  
ever, that the modem automatically selects the code type if the  
server sends the proper ID.  
%U0 Selects µ-Law coding—used in North America and Japan.  
%U1 Selects A-Law coding—used outside North America and Japan.  
Note: See also the +MS= command.  
Command:  
Values:  
\An Maximum MNP Block Size  
n = 0, 1, 2, or 3  
Default:  
1
Description: \ A0 64-character maximum block size.  
\ A1 128-character maximum block size.  
\ A2 192-character maximum block size.  
\ A3 256-character maximum block size.  
Command:  
Values:  
\Bn Transmit Break  
n = 0–9 in 100 ms units  
Default:  
3
Description:  
In non-error-correction mode only, sends a break signal of the  
specified length to a remote modem. Works in conjunction  
with the \ K command.  
Command:  
Values:  
\Kn Break Control  
n = 0–5  
Default:  
5
Description:  
Controls the response of the modem to a break received from  
the computer, the remote modem, or the \ B command. The  
response is different for each of three different states.  
Data mode. The modem receives the break from the computer:  
\ K0 Enter online command mode, no break sent to the remote mo-  
dem.  
\ K1 Clear data buffers and send break to the remote modem.  
\ K2 Same as \ K0.  
\ K3 Send break immediately to the remote modem .  
\ K4 Same as \ K0.  
\ K5 Send break to the remote modem in sequence with the trans-  
mitted data.  
Data mode. The modem receives the break from the remote  
modem during a non-error-corrected connection:  
\ K0 Clear data buffers and send break to the computer.  
\ K1 Same as \ K0.  
\ K2 Send break immediately to the computer.  
\ K3 Same as \ K2.  
\ K4 Send break to the computer in sequence with the received  
data.  
\ K5 Same as \ K4.  
Multi-Tech Systems, Inc.  
39  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Online command mode. The modem receives a \ Bn command  
from the computer:  
\ K0 Clear data buffers and send break to the remote modem.  
\ K1 Same as \ K0.  
\ K2 Send break immediately to the remote modem.  
\ K3 Same as \ K2.  
\ K4 Send break to the remote modem in sequence with the trans-  
mitted data.  
\ K5 Same as \ K4.  
Command:  
Values:  
\Nn Error Correction Mode Selection  
n = 0–5  
Default:  
3
Description: \ N0 Normal (non-error correction) mode with data buffering.  
(Forces &Q6.)  
\ N1 Direct mode. Equivalent of &M0 and &Q0 modes. (Forces &Q0.)  
\ N2 V.42/ MNP reliable (error-correction) mode. The modem at-  
tempts first a V.42 connection and then an MNP connection.  
Failure to make a reliable connection results in the modem  
hanging up. (Forces &Q5, S36=4, and S48=7.)  
\ N3 V.42/ MNP auto-reliable mode. The modem attempts first to  
connect in V.42 mode, then in MNP mode, and finally in non-  
error-correction mode with data buffering. (Forces &Q5, S36=7,  
and S48=7.)  
\ N4 V.42 (LAPM) reliable mode.If the modem cannot make a V.42  
connection, it disconnects. (Forces &Q5 and S48=0.) Note: The  
-K1 command can override the \ N4 command.  
\ N5 MNP reliable mode.If the modem cannot make an MNP con-  
nection, it disconnects. (Forces &Q5, S36=4, and S48=128.)  
Command:  
Values:  
\Vn Single Line Connect Message  
n = 0 or 1  
Default:  
0
Description: \ V0 Disables single line connect message. Connect messages are  
controlled by the X, W, and S95 settings.  
\ V1 Enables single line connect messages in the format: CONNECT  
<Serial Port Speed></ Modulation></ Protocol></ Compression>  
</ Line Speed>/ <Voice and Data>. Overrides the X, W, and S95  
commands. Connect messages are displayed in the single line  
format subject to the commands V and Q. In non-verbose  
mode (V0), single line connect messages are disabled and a  
single numeric result code is generated for CONNECT.  
Multi-Tech Systems, Inc.  
40  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command: +MS= Modulation Selection  
Values:  
See description.  
Default:  
See description.  
Description:  
This extended-format command selects modulation and, op-  
tionally, enables or disables automode, specifies the lowest and  
highest connection rates, selects µ-Law or A-Law codec type,  
and specifies the highest transmit rate using one to five  
subparameters.  
The command format is  
+MS=[mod][,[automode][,[min_RX_rate][,[max_RX_rate][,[x_law]  
[,[reserved][,[max_TX_rate]]]]]]]<CR>  
Subparameters that are not entered retain their current value.  
Commas separate optional subparameters, and should be in-  
serted to skip a subparameter. Example: +MS=,0,<CR> disables  
automode and keeps all other settings at their current values.  
+MS? Reports current options in the format  
mod,automode,min_RX_rate,max_RX_rate,x_law,reserved,max_TX_rate.  
Example: 56,1,300,56000,0,0,33600.  
+MS=? Reports supported options in the format (list of supported mod  
values),(list of supported automode values),(list of supported  
min_RX_rate values),(list of supported max_RX_rate values),  
(list of supported x_law values), (list of supported reserved  
values),(list of supported max_TX_rate values).  
Example: (0,1,2,3,9,10,11,56,64,69),(0,1),(300-33600),(300-  
56000),(0,1),(0,1),(300-33600).  
Subparameters  
mod A decimal number that specifies the preferred modula-  
tion (automode enabled) or the modulation to use in originat-  
ing or answering a connection (automode disabled). See the  
table on the next page.  
automode An optional numeric value that enables or disables  
automatic modulation negotiation using V.8 bis/ V.8 or V.32  
bis Annex A. The options are:  
0 = Disable automode  
1 = Enable automode (default)  
min_RX_rate An optional number that specifies the lowest  
rate at which the modem may establish a receive connection.  
The value is decimal coded in units of bps, e.g., 2400 specifies  
the lowest rate to be 2400 bps. See “Possible rates” in the mod  
table. The default is 300 for 300 bps.  
max_RX_rate An optional number that specifies the highest  
rate at which the modem may establish a receive connection.  
The value is decimal coded in units of bps, e.g., 28800 specifies  
the highest rate to be 28800 bps. See “Possible rates” in the mod  
table. The default is 56000, for 56000 bps.  
Multi-Tech Systems, Inc.  
41  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
<mod>  
Modulation  
Possible rates (bps)1  
0
1
V.21  
300  
V.22  
1200  
2
V.22bis  
V.23  
2400 or 1200  
3
1200  
9
V.32  
9600 or 4800  
10  
11  
V.32bis  
V.34  
14400, 12000, 9600, 7200, or 4800  
33600, 31200, 28800, 26400, 24000, 21600,19200, 16800,  
14400, 12000, 9600, 7200, 4800, or 2400  
122  
563  
V.90  
56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,  
45333, 44000, 42667, 41333. 40000, 38667, 37333, 36000,  
34667, 33333, 32000, 30667, 29333, or 28000  
K56flex  
56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000,  
40000, 38000, 36000, 34000, or 32000  
64  
69  
Bell 103  
Bell212  
300  
1200  
Notes:  
1. See optional <automode>, <min_RX_rate>, <max_RX_rate>, and <max_TX_rate>  
subparameters.  
2. Selects V.90 modulation as first priority. If a V.90 connection cannot be established,  
the modem attempts K56flex, V.34, V.32bis, etc. (Default.)  
3. Selects K56flex modulation as first priority. If a K56flex connection cannot be  
established, the modem attempts V.90, V.34, V.32bis, etc.  
x_law An optional number that specifies the PCM code type for 56K  
modulation. The options are:  
0 = µ-Lawused in North America and Japan (default)  
1 = A-Law—used outside North America and Japan  
The modem automatically selects A-Law or µ-Law if the server  
sends the Conexant ID. Note that the ATZ command restores  
the x_law value from NVRAM. You can also manually select  
A-Law or µ-Law using the %U command.  
reserved Must not be changed from the default value of 0.  
max_TX_rate An optional number that specifies the highest  
rate at which the modem may establish a transmit connection.  
The value is decimal coded in units of bps, e.g., 33600 specifies  
the highest rate to be 33600 bps. See “Possible rates” in the mod  
table. The default is 33600, for 33600 bps.  
Command:  
Values:  
-Kn MNP Extended Services  
n = 0, 1, or 2  
Default:  
0
Description:  
Enables or disables conversion of a V.42 LAPM connection to  
an MNP 10 connection.  
-K0 Disables V.42 LAPM to MNP 10 conversion.  
-K1 Enables V.42 LAPM to MNP 10 conversion.  
-K2 Enables V.42 LAPM to MNP 10 conversion; inhibits MNP  
Extended Services initiation during V.42 LAPM answer mode  
detection phase.  
Multi-Tech Systems, Inc.  
42  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command: -SDR=n Distinctive Ring Control  
Values:  
0–7  
Default:  
0
Description:  
This command enables or disables detection and reporting of  
distinctive ring. One, two, or three distinctive ring types can be  
simultaneously enabled depending upon the value of n. The  
detected ring type is reported in the verbose result code by ap-  
pending the ring type number to the end of the RING message.  
-SDR=0 Disables distinctive ring. Any valid ring detected is reported as  
RING.  
-SDR=1 Enables distinctive ring type 1.  
-SDR=2 Enables distinctive ring type 2.  
-SDR=3 Enables distinctive ring types 1 and 2.  
-SDR=4 Enables distinctive ring type 3.  
-SDR=5 Enables distinctive ring types 1 and 3.  
-SDR=6 Enables distinctive ring types 2 and 3.  
-SDR=7 Enables distinctive ring types 1, 2, and 3.  
The supported ring types and ring cadence detection criteria  
are shown in the following table:  
Distinctive  
ring type  
Ring cadence detection criteria  
1
2
3
2.0 sec. on, 4.0 sec. off  
0.8 sec. on, 0.4 sec. off, 0.8 sec. on, 0.4 sec. off  
0.4 sec. on, 0.2 sec. off, 0.4 sec. on, 0.2 sec. off, 0.8 sec. on, 0.4 sec. off  
Command:  
Values:  
**n  
Flash Memory Download  
n = 0, 1, or 2  
Description: **0  
Initiate download to flash memory at the last sensed speed  
Initiate download to flash memory at 38.4K bps  
Initiate download to flash memory at 57.6K bps  
**1  
**2  
Command: #CID=n Caller ID  
Values:  
n = 0, 1, or 2  
Default:  
0
Description:  
Enables or disables Caller ID recognition and reporting.  
#CID=0 Disables Caller ID.  
#CID=1 Enables formatted Caller ID reporting of ICLID SDM (Single  
Data Message) and MDM (Multiple Data Message) packets.  
#CID=2 Enables unformatted Caller ID reporting of any ICLID packet  
received after the first RING cycle, including SDM, MDM, or  
call waiting packets.  
#CID? Retrieves the current Caller ID mode from the modem.  
#CID=? Returns the mode capabilities of the modem in a list with each  
element separated by commas.  
Multi-Tech Systems, Inc.  
43  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command: $SBn Serial Port Baud Rate  
Values:  
Default:  
n = speed in bits per second  
57600  
Description: $SB300  
$SB1200  
Set serial port to 300 bps.  
Set serial port to 1200 bps.  
Set serial port to 2400 bps.  
Set serial port to 4800 bps.  
Set serial port to 9600 bps.  
$SB2400  
$SB4800  
$SB9600  
$SB19200 Set serial port to 19200 bps.  
$SB38400 Set serial port to 38400 bps.  
$SB57600 Set serial port to 57600 bps.  
$SB115200 Set serial port to 115200 bps.  
$SB230400 Set serial port to 230400 bps.  
Note: See also the L5 command.  
Command: +++AT<CR> Escape Sequence  
Values:  
n/ a  
Description:  
Puts the modem in command mode (and optionally issues a  
command) while remaining online. Type +++AT and up to ten  
command characters, then press ENTER. Used mostly to issue  
the hang-up command: +++ATH<CR>.  
Vo ice Co m m a n d s  
The MultiModemDSVD uses DSVD technology to achieve simultaneous voice and  
data operation over a telephone line. Establishing a DSVD connection is like estab-  
lishing a regular data modem connection. Initiate the call to another DSVD modem  
using normal dialing (ATD) and answering (ATA) procedures. The modem can  
switch from a regular phone conversation into DSVD mode and back to phone con-  
versation. A headset or microphone/ speaker can be used for voice communication  
during DSVD mode.  
Command: -SMS=n Data/DSVD Mode  
Values:  
Default:  
n = 0, 1, or 3  
3
Description: -SMS=0 Data mode.  
-SMS=1 DSVD mode.  
-SMS=3 Automatic mode select (data/ DSVD)  
Note: DSVD mode can be enabled by either the -SSE=1 or the  
-SMS=1 command, and disabled by either -SSE=0 or -SMS=0.  
Multi-Tech Systems, Inc.  
44  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Command: -SSE=n DSVD Enable/Disable  
Values:  
Default:  
n = 0 or 1  
0
Description: -SSE=0 Disable DSVD.  
-SSE=1 Enable DSVD.  
Note: DSVD mode can be enabled by either the -SSE=1 or the  
-SMS=1 command, and disabled by either -SSE=0 or -SMS=0.  
Command: #BDR=n Baud Rate Select  
Values:  
Default:  
n = 0–48  
0
Description: #BDR=0 Enables autobaud detection on the serial port interface.  
#BDR=n 1<n<48. Sends OK message at current speed, then switches to  
the new speed defined by n × 2400 bps unless and until an-  
other #BDR= command is received. Autobaud is disabled, and  
the character format is maintained at the format most recently  
detected.  
Command: #CLS=n Data, Fax, or Voice/Audio Select  
Values:  
Default:  
n = 0, 1, 2, or 8  
0
Description: #CLS=0 Data mode: The modem acts like a data modem on subsequent  
answer or originate operations.  
#CLS=1 Class 1 fax mode: Selects Class 1 fax modem operation.  
#CLS=2 Class 2 fax mode: Selects Class 2 fax modem operation.  
#CLS=8 Voice/ audio mode: All telephone calls initialized by #CLS=8  
result, after successful call progress, in the modem operating in  
online voice command mode.  
Command: #MDL? Identify Model  
Values:  
n/ a  
Description:  
Displays the modem name or model.  
Command: #MFR? Identify Manufacturer  
Values:  
n/ a  
Description:  
Displays the name of the manufacturer.  
Command: #REV? Identify Revision Level  
Values:  
n/ a  
Description:  
Displays the revision level of the modems firmware.  
Command: #VLS=n Voice Line Select  
Values:  
Default:  
n = 5 or 6  
5
Description: #VLS=5 Selects the headset while in #CLS=8 (voice/ audio) mode.  
#VLS=6 Select the speakerphone while in #CLS=8 (voice/ audio) mode.  
Note: The #VLS= command must be issued prior to establish-  
ing a DSVD connection if a voice line other than the default  
headset is desired.  
Multi-Tech Systems, Inc.  
45  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
S-Re g is t e r s  
Certain modem values, or parameters, are stored in memory locations called S-  
registers. Use the S command to read or to alter the contents of S-registers (see  
previous section).  
Register Unit  
Range  
Default  
Description  
S0  
1 ring  
0, 1–255  
1
Sets the number of rings before the mo-  
dem answers. ATS0=0 disables autoan-  
swer completely.  
S1  
S2  
1 ring  
0–255  
0
Counts the rings that have occurred.  
decimal 0–127  
128–255  
43 (+)  
Sets ASCII code for the escape sequence  
character. Values greater than 127 disable  
escape.  
S3  
S4  
S5  
decimal 0–127  
decimal 0–127  
13 (^M) Sets the ASCII code for the carriage return  
character.  
10 (^J)  
Sets the ASCII code for the line feed char-  
acter.  
decimal 0–32  
33–127  
8 (^H)  
Sets the ASCII code for the backspace  
character. Values greater than 32 disable  
backspace.  
S6  
S7  
seconds 2–255  
seconds 1–255  
2
Sets the time the modem waits after it goes  
off-hook before it begins to dial the tele-  
phone number.  
50  
Sets the time the modem waits for a carrier  
signal before aborting a call. Also sets the  
wait for silence time for the @ dial modifi-  
er, and the time the modem waits for the  
dial tone after encountering W in the dial  
string.  
S8  
S9  
seconds 0–255  
2
6
Sets the length of a pause caused by a  
comma character in a dialing command.  
100 ms  
100 ms  
1–255  
1–255  
Sets the time, in tenths of a second, that  
the carrier must be present before the mo-  
dem considers it valid.  
S10  
14  
Sets how long a carrier signal must be lost  
before the modem disconnects.  
S11  
S12  
1 ms  
50–255  
0–255  
95  
50  
Sets spacing and duration of dialing tones.  
20 ms  
Defines the maximum period, in fiftieths  
of second, allowed between receipt of the  
last character of the three escape character  
sequence from the computer and the send-  
ing of the OK result code to the computer.  
(Escape code guard time).  
Multi-Tech Systems, Inc.  
46  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Register Unit  
Range  
Default Description  
S18  
seconds 0–255  
0
Sets the length of time that the modem con-  
ducts an &T test before it returns to the  
command mode. If the value is zero, the test  
must be terminated from command mode  
by issuing an &T0 or H command. When  
S18 is non-zero, the modem returns the OK  
message upon test termination.  
S24  
seconds 0–255  
0
Sets the length of time that the modem op-  
erates in normal mode with no detected  
telephone or serial port activity before en-  
tering low-power sleep mode. The timer is  
reset upon any serial port or telephone line  
activity.  
S25  
S29  
S30  
10 ms  
10 ms  
10 ms  
0–255  
5
Sets the length of time that the modem ig-  
nores DTR while taking the action specified  
by &D.  
0–255  
70  
0
Sets the length of time that the modem goes  
on-hook when it encounters a flash dial  
modifier (!) in the dial string.  
0, 1–255  
Sets the length of time that the modem  
waits before disconnecting when no data is  
sent or received. A value of zero disables  
the timer.  
S32  
S33  
S35  
decimal 0–255  
decimal 0–255  
decimal 0–1  
17  
19  
0
Sets the ASCII code for the XON character.  
Sets the ASCII code for the XOFF character.  
0 disables, 1 enables the V.25 data calling  
tone, which allows remote data/ fax/ voice  
discrimination.  
S36  
decimal 0–7  
7
LAPM Failure Control. Specifies the fall-  
back action to take in the event of an LAPM  
negotiation failure. These fallback options  
are initiated immediately upon connection  
if S48 = 128. If an invalid number is entered,  
S36 acts as if the default value has been en-  
tered. (See S48.)  
0 Modem disconnects.  
1 Modem stays online and a direct  
mode connection is established.  
2 Reserved.  
3 Modem stays on-line and a normal  
mode connection is established.  
4 An MNP connection is attempted and  
if it fails, the modem disconnects.  
5 An MNP connection is attempted and  
if it fails, a direct mode connection is  
established.  
Multi-Tech Systems, Inc.  
47  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Register Unit  
Range  
Default Description  
6 Reserved.  
7 An MNP connection is attempted and  
if it fails, a normal modem connection  
is established.  
S37  
decimal  
0
0
Sets the maximum V.34 speed at which the  
modem attempts to connect. The default  
value is an automode connection. If N0 is  
active, connection is attempted at the most  
recently sensed serial port speed (+MS=  
command settings are updated to the ap-  
propriate values). If N1 is active, connec-  
tion is attempted at the highest possible  
speed. (+MS= settings are updated to  
11,1,300,3360 to reflect V.34, automode,  
300 bps minimum speed, and 33600 bps  
maximum speed). Supported only for  
compatibility with existing software; use  
the +MS= command instead.  
S38  
seconds 0–254, 255 20  
Sets the delay between the modems receipt  
of the H command to disconnect (or high-  
to-low transition of DTR if the modem is  
programmed to follow the signal), and the  
disconnect operation. Applies only to error-  
correction connections. This register can be  
used to ensure that data in the modem buff-  
er is sent before the modem disconnects. If  
S38 is set to a value between 0 and 254, the  
modem waits for the remote modem to ac-  
knowledge all data in the modem buffer  
before disconnecting. If S38 is set to 255, the  
modem does not time out, and continues to  
attempt to deliver data in the buffer until  
the connection is lost or the data is delivered.  
S46  
S48  
decimal 136, 138 138  
Enables or disables data compression:  
136 Error correction without compression.  
138 Error correction with compression.  
decimal 0, 7, 128  
7
Enables or disables LAPM negotiation. An  
invalid value is treated as a 128 value.  
0 Disables negotiation and proceeds  
with LAPM.  
7 Enables negotiation.  
128 Disables negotiation and proceeds at  
once with the fallback action specified  
in S36. Can be used to force MNP.  
Multi-Tech Systems, Inc.  
48  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Register Unit  
Range  
Default Description  
n/ a When the modem issues a NO CARRIER  
S86  
decimal 0, 3–23  
result code, a value is written to this register  
to help determine the reason for the failed  
connection. S86 records the first event that  
contributes to a NO CARRIER message. Use  
the S86? command to read the value.  
0 Normal disconnect; no error occurred.  
3 Call Waiting caused disconnect.  
4 Physical loss of carrier.  
5 No error correction at the other end.  
6 No response to feature negotiation.  
7 This modem is async-only, the other  
sync-only.  
8 No framing technique in common.  
9 No protocol in common.  
10 Bad response to feature negotiation.  
11 No sync information from remote  
modem.  
12 Normal disconnect initiated by remote  
modem.  
13 Remote modem does not respond after  
10 retransmissions of the same message.  
14 Protocol violation.  
15 DTR lost.  
15 Three retrains or excessive  
retransmissions when no DTR.  
16 Received GSTN cleardown.  
17 Inactivity timeout.  
18 Speed not supported.  
19 Long space disconnect.  
20 Key abort disconnect.  
21 Clears previous disconnect reason.  
22 No connection established.  
23 Disconnect after three retrains.  
S95  
decimal 0–15,  
32–47  
0
The bits in this register can be set to over-  
ride some of the W command options. A bit  
set to a 1 in this register enables the corre-  
sponding result code regardless of the W  
setting.  
Bit 0 CONNECT result code indicates  
DCE speed instead of DTE speed.  
Bit 1 Append/ ARQ to CONNECT XXXX  
result code in error-correction mode.  
Bit 2 Enable CARRIER XXXX result code.  
Bit 3 Enable PROTOCOL XXXX result code.  
Bit 4 Reserved.  
Bit 5 Enable COMPRESSION result code .  
Bit 6 Reserved.  
Bit 7 Reserved.  
Multi-Tech Systems, Inc.  
49  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Re s u lt Co d e s  
In command mode your modem can send the following responses, called result  
codes, to your computer. Result codes are used by communications programs and  
can also appear on your monitor.  
Terse Verbose  
Description  
0
OK  
Command executed  
1
2
CONNECT  
RING  
Modem connected to line  
Ring signal detected  
3
4
NO CARRIER  
ERROR  
Carrier signal lost or not detected  
Invalid command  
5
6
7
CONNECT 1200  
NO DIALTONE  
BUSY  
Connected at 1200 bps  
No dial tone detected  
Busy signal detected  
8
9
NO ANSWER  
CONNECT 0600  
CONNECT 2400  
CONNECT 4800  
CONNECT 9600  
CONNECT 7200  
CONNECT 12000  
CONNECT 14400  
CONNECT 19200  
CONNECT 38400  
CONNECT 57600  
CONNECT 115200  
CONNECT 230400  
No answer at remote end  
Connected at 600 bps  
Connected at 2400 bps  
Connected at 4800 bps  
Connected at 9600 bps  
Connected at 7200 bps  
Connected at 12000 bps  
Connected at 14400 bps  
Connected at 19200 bps  
Connected at 38400 bps  
Connected at 57600 bps  
Connected at 115200 bps  
Connected at 230400 bps  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
22  
23  
24  
32  
33  
35  
40  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
61  
CONNECT 75TX/1200RX V.23 connection in originate mode  
CONNECT 1200TX/75RX V.23 connection in answer mode  
DELAYED  
BLACKLISTED  
FAX  
Delay is in effect for the dialed number  
Dialed number is blacklisted  
Connected in fax mode  
DATA  
Connected in data mode  
CARRIER 300  
CARRIER 1200/75  
CARRIER 75/1200  
CARRIER 1200  
CARRIER 2400  
CARRIER 4800  
CARRIER 7200  
CARRIER 9600  
CARRIER 12000  
CARRIER 14400  
CARRIER 16800  
CARRIER 19200  
CARRIER 21600  
CARRIER 24000  
CARRIER 26400  
CARRIER 28800  
CONNECT 16800  
CONNECT 21600  
0-300 bps data carrier detected  
V.23 backward channel detected  
V.23 forward channel detected  
1200 bps data carrier detected  
2400 bps data carrier detected  
4800 bps data carrier detected  
7200 bps data carrier detected  
9600 bps data carrier detected  
12000 bps data carrier detected  
14400 bps data carrier detected  
16800 bps data carrier detected  
19200 bps data carrier detected  
21600 bps data carrier detected  
24000 bps data carrier detected  
26400 bps data carrier detected  
28800 bps data carrier detected  
Connected at 16800 bps  
Connected at 21600 bps  
Multi-Tech Systems, Inc.  
50  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Terse Verbose  
Description  
62  
63  
64  
CONNECT 24000  
CONNECT 26400  
CONNECT 28800  
Connected at 24000 bps  
Connected at 26400 bps  
Connected at 28800 bps  
66  
67  
69  
COMPRESSION CLASS 5 Connected with MNP Class 5 data compression  
COMPRESSION V.42 bis Connected with V.42 bis data compression  
COMPRESSION NONE Connected without data compression  
70  
77  
78  
79  
PROTOCOL NONE  
PROTOCOL LAPM  
CARRIER 31200  
CARRIER 33600  
PROTOCOL ALT  
Connected without any protocol  
Connected in V.42 LAPM mode  
56000 bps data carrier detected  
33600 bps data carrier detected  
Connected in MNP mode  
80  
81  
PROTOCOL ALT-CELLULAR Connected in MNP 10 mode  
84  
91  
CONNECT 33600  
CONNECT 31200  
CARRIER 32000  
CARRIER 34000  
CARRIER 36000  
CARRIER 38000  
CARRIER 40000  
CARRIER 42000  
CARRIER 44000  
CARRIER 46000  
CARRIER 48000  
CARRIER 50000  
CARRIER 52000  
CARRIER 54000  
CARRIER 56000  
CONNECT 32000  
CONNECT 34000  
CONNECT 36000  
CONNECT 38000  
CONNECT 40000  
CONNECT 42000  
CONNECT 44000  
CONNECT 46000  
CONNECT 48000  
CONNECT 50000  
CONNECT 52000  
CONNECT 54000  
CONNECT 56000  
CONNECT 28000  
CARRIER 28000  
CONNECT 29333  
CARRIER 29333  
CONNECT 30667  
CARRIER 30667  
CONNECT 33333  
CARRIER 33333  
CONNECT 34667  
CARRIER 34667  
Connected at 33600 bps  
Connected at 31200 bps  
150  
151  
152  
153  
154  
155  
156  
157  
158  
159  
160  
161  
162  
165  
166  
167  
168  
169  
170  
171  
172  
173  
174  
175  
176  
177  
180  
180  
181  
181  
182  
182  
183  
183  
184  
184  
32000 bps data carrier detected  
34000 bps data carrier detected  
36000 bps data carrier detected  
38000 bps data carrier detected  
40000 bps data carrier detected  
42000 bps data carrier detected  
44000 bps data carrier detected  
46000 bps data carrier detected  
48000 bps data carrier detected  
50000 bps data carrier detected  
52000 bps data carrier detected  
54000 bps data carrier detected  
56000 bps data carrier detected  
Connected at 32000 bps  
Connected at 34000 bps  
Connected at 36000 bps  
Connected at 38000 bps  
Connected at 40000 bps  
Connected at 42000 bps  
Connected at 44000 bps  
Connected at 46000 bps  
Connected at 48000 bps  
Connected at 50000 bps  
Connected at 52000 bps  
Connected at 54000 bps  
Connected at 56000 bps  
Connected at 28000 bps (V.90 mode)  
28000 bps data carrier detected (V.90 mode)  
Connected at 29333 bps (V.90 mode)  
29333 bps data carrier detected (V.90 mode)  
Connected at 30667 bps (V.90 mode)  
30667 bps data carrier detected (V.90 mode)  
Connected at 33333 bps (V.90 mode)  
33333 bps data carrier detected (V.90 mode)  
Connected at 34667 bps (V.90 mode)  
34667 bps data carrier detected (V.90 mode)  
Multi-Tech Systems, Inc.  
51  
 
MultiModemDSVD User Guide  
4 AT Commands, S-Registers, and Result Codes  
Terse Verbose  
Description  
185  
185  
186  
186  
187  
187  
188  
188  
189  
189  
190  
190  
191  
191  
192  
192  
193  
193  
194  
194  
+F4  
CONNECT 37333  
CARRIER 37333  
Connected at 37333 bps (V.90 mode)  
37333 bps data carrier detected (V.90 mode)  
CONNECT 38667  
CARRIER 38667  
CONNECT 41333  
CARRIER 41333  
CONNECT 42667  
CARRIER 42667  
CONNECT 45333  
CARRIER 45333  
CONNECT 46667  
CARRIER 46667  
CONNECT 49333  
CARRIER 49333  
CONNECT 50667  
CARRIER 50667  
CONNECT 53333  
CARRIER 53333  
CONNECT 54667  
CARRIER 54667  
+FCERROR  
Connected at 38667 bps (V.90 mode)  
38667 bps data carrier detected (V.90 mode)  
Connected at 41333 bps (V.90)  
41333 bps data carrier detected (V.90)  
Connected at 42667 bps (V.90)  
42667 bps data carrier detected (V.90)  
Connected at 45333 bps (V.90)  
45333 bps data carrier detected (V.90)  
Connected at 46667 bps (V.90)  
46667 bps data carrier detected (V.90)  
Connected at 49333 bps (V.90)  
49333 bps data carrier detected (V.90)  
Connected at 50667 bps (V.90)  
50667 bps data carrier detected (V.90)  
Connected at 53333 bps (V.90)  
53333 bps data carrier detected (V.90)  
Connected at 54667 bps (V.90)  
54667 bps data carrier detected (V.90)  
V.21 signal received/ high speed fax expected  
(V.27, V.29, V.33 or V.17).  
Multi-Tech Systems, Inc.  
52  
 
Ch a p t e r 5 - So lv in g  
P r o b le m s  
 
MultiModemDSVD User Guide  
5 Solving Problems  
In t r o d u ct io n  
Your modem was thoroughly tested at the factory before it was shipped. If you are  
unable to make a successful connection, or if you experience data loss or garbled  
characters during your connection, it is possible that the modem is defective. How-  
ever, it is more likely that the source of your problem lies elsewhere. The following  
symptoms are typical of problems you might encounter:  
None of the LEDs light when the modem is on.  
• The modem does not respond to commands.  
• The modem dials but is unable to make a connection.  
• The modem disconnects while online.  
• The modem cannot connect when answering.  
• File transfer is slower than it should be.  
• Data is being lost.  
• There are garbage characters on the monitor.  
• The modem doesnt work with Caller ID.  
• Fax and data software cant run at the same time.  
If you experience problems, please check the following possibilities before calling  
Technical Support (see Appendix D).  
No n e o f t h e In d ica t o r s Lig h t  
When you turn on the modem, the LED indicators on the front panel should flash  
briefly as the modem runs a self-test. If the LEDs remain off, the modem is probably  
not receiving power.  
Make sure the modems power switch is on, especially if you normally turn on  
the modem by turning on a power strip.  
If the power supply is plugged into a power strip, make sure the power strip is  
plugged in and its power switch is on.  
Make sure the power supply module is firmly connected to the modem and to  
the wall outlet or power strip.  
If the power strip is on and the modem switch is on, try moving the modem  
power supply to another outlet on the power strip.  
Test that the outlet is live by plugging a lamp into it.  
The modem or power supply may be defective. If you have another Multi-Tech  
modem, try swapping modems. If the problem goes away, the first modem or  
power supply may be defective. Call Tech Support for assistance.  
CAUTION: Do not under any circumstances replace the power supply module with  
one designed for another product, as it can damage the modem and void your warranty.  
54  
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
5 Solving Problems  
Th e M o d e m Do e s No t Re s p o n d t o Co m m a n d s  
Make sure the modem is plugged in and turned on. (See “None of the Indicators  
Light.”)  
Make sure you are issuing the modem commands from the data communications  
software, either manually in terminal mode or automatically by configuring the  
software. (You cannot send commands to the modem from the DOS prompt.)  
Make sure you are in terminal mode in your data communications program, then  
type AT and press ENTER. If you get an OK response, your connections are good  
and the problem likely is in the connection setup in your communications software.  
Try resetting your modem by turning it off and on. If you are using DOS or Win-  
dows 3.1 communications software, make sure the initialization string includes  
&F as the first command, to cancel any “leftover’ command that could affect the  
modems operation.  
If you dont get an OK, the problem may still be in the communications software.  
Make sure you have done whatever is necessary in your software to make a port  
connection. Not all communications programs connect to the COM port automat-  
ically. Some connect when the software loads and remain connected until the  
program terminates. Others can disconnect without exiting the program. The  
modems TR indicator lights to show that the software has taken control of the  
modem through the COM port.  
Your communications software settings may not match the physical port the modem  
is connected to. The serial cable might be plugged into the wrong connector—check  
your computer documentation to make sure. Or you might have selected a COM  
port in your software other than the one the modem is physically connected to—  
compare the settings in your software to the physical connection.  
If the modem is on, the cable is plugged into the correct port, the communica-  
tions software is configured correctly, and you still dont get an OK, the fault  
might be in the serial cable. Make sure it is firmly connected at both ends.  
Is this the first time you have used the cable? If so, it may not be wired correctly.  
Check the cable description on the packaging to make sure the cable is the right  
one for your computer.  
Peripheral expansion cards, such as sound and game cards, might include a seri-  
al port preconfigured as COM1 or COM2. The extra serial port, or the card itself,  
may use the same COM port, memory address, or interrupt request (IRQ) as  
your communications port. Be sure to disable any unused ports.  
Windows 3.1x: To look for address or IRQ conflicts, in Program Manager select  
File | Run, type MSD, and press ENTER. Then select Mouse, COM Ports, and  
IRQ Status, and note the addresses and IRQs that are in use. If you find an IRQ  
conflict, note which IRQs are not being used, then change one of the conflicting  
devices to use one of the unused IRQs. If you find an address conflict, change the  
address of one of the conflicting devices.  
To change a port address or IRQ in Windows 3.1x, double-click the Control Panel  
icon, then the Ports icon. Click on the port you want to change, click Settings,  
click Advanced, and select the new port address and/ or interrupt. If you wish to  
use COM3 or COM4, note that COM3 shares an IRQ with COM1, as does COM4  
with COM2, so you should change their IRQs to unused ones, if possible.  
55  
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
5 Solving Problems  
Windows 9x: Right-click on My Computer, select Properties from the menu,  
click on the Device Manager tab, double-click on Ports, then double-click on the  
communication port your modem is connected to. In the ports Properties sheet,  
click on the Resources tab to see the ports input/ output range and interrupt re-  
quest. If another device is using the same address range or IRQ, it appears in the  
Conflicting Device List. Uncheck Use automatic settings to change the ports  
settings so they do not conflict with the other device, or select the port the con-  
flicting device is on and change it instead. If you need to open your computer to  
change switches or jumpers on the conflicting device; refer to the devices docu-  
mentation.  
Windows NT 4.0: To look for address or IRQ conflicts, click Start, Programs, Ad-  
ministrative Tools (Common), and Windows NT Diagnostics. In the Windows  
NT Diagnostics dialog box, click the Resources tab to see which input/ output  
ranges and interrupt requests are in use. If you need to open your computer to  
change switches or jumpers on the conflicting device; refer to the devices docu-  
mentation.  
The serial port might be defective. If you have another serial port, install the mo-  
dem on it, change the COM port setting in your software, and try again.  
The modem might be defective. If you have another Multi-Tech modem, try swap-  
ping modems. If the problem goes away, the first modem is possibly defective.  
Call Tech Support for assistance (see Appendix D).  
Th e M o d e m Dia ls Bu t Ca n n o t Co n n ec t  
There can be several reasons the modem fails to make a connection. Possibilities include:  
• lack of a physical connection to the telephone line.  
• a wrong dial tone.  
• a busy signal.  
• a wrong number.  
• no modem at the other end.  
• a faulty modem, computer, or software at the other end.  
• incompatibility between modems.  
You can narrow the list of possibilities by using extended result codes. Extended re-  
sult codes are enabled by default. If they have been disabled, include V1X4 in the  
modems initialization string, or in terminal mode enter ATV1X4 and press ENTER.  
When you dial again, the modem will report the calls progress.  
If the modem reports NO DIALTONE, check that the modems telephone line  
cable is connected to both the modems LINE jack (not the PHONE jack) and the  
telephone wall jack. If the cable looks secure, try replacing it. If that doesnt  
work, the problem might be in your buildings telephone installation. To test the  
building installation, plug a telephone into your modems telephone wall jack  
and listen for a dial tone. If you hear a dial tone, your modem might be installed  
behind a company phone system (PBX) with an internal dial tone that sounds  
different from the normal dial tone. In that case, the modem might not recognize  
the dial tone and might treat it as an error. Check your PBX manual to see if you  
can change the internal dial tone; if you cant, change your modems initialization  
string to replace X4 with X3, which will cause the modem to ignore dial tones (note,  
however, that X3 is not allowed in some countries, such as France and Spain).  
56  
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
5 Solving Problems  
If the modem reports BUSY, the other number might be busy, in which case you  
should try again later, or it might indicate that you have failed to add a 9, prefix  
to the phone number if you must dial 9 for an outside line.  
If you must dial 9 to get an outside line, the easiest way to dial it automatically is  
to include it in the modems dial prefix, e.g., ATDT9,. Note the comma, which  
inserts a pause before the number is dialed. By inserting 9, into the dial prefix,  
you do not have to include it in each directory entry.  
To change the dial prefix in Windows HyperTerminal, select Connect from the  
Call menu, click Dialing Properties, and type 9 in the local and long distance  
boxes in How I dial from this location.  
If the modem reports NO ANSWER, the other system has failed to go off-hook, or  
you might have dialed a wrong number. Check the number.  
If the modem reports NO CARRIER, the phone was answered at the other end,  
but no connection was made. You might have dialed a wrong number, and a per-  
son answered instead of a computer, or you might have dialed the correct  
number but the other computer or software was turned off or faulty. Check the  
number and try again, or try calling another system to make sure your modem is  
working. Also, try calling the number on your telephone. If you hear harsh  
sounds, then another modem is answering the call, and the modems might be  
having problems negotiating because of modem incompatibilities or line noise.  
Try connecting at a lower speed.  
Th e M o d e m Dis co n n ect s W h ile O n lin e  
If you have Call Waiting on the same phone line as your modem, it can interrupt  
your connection when someone tries to call you. If you have Call Waiting, dis-  
able it before each call. In most telephone areas in North America, you can  
disable Call Waiting by preceding the telephone number with *70 (check with  
your local telephone company).  
You can automatically disable Call Waiting by including the disabling code in  
the modems dial prefix (e.g., ATDT*70,—note the comma, which inserts a pause  
before the number is dialed). To change the dial prefix in Windows Terminal, se-  
lect Settings | Modem Commands. To change it in Windows HyperTerminal,  
select Connect from the Call menu, click Dialing Properties, check This location  
has Call Waiting, and select the correct code for your phone service.  
If you have extension phones on the same line as your modem, you or someone  
else can interrupt the connection by picking up another phone. If this is a fre-  
quent problem, disconnect the extension phones before using the modem, or  
install another phone line especially for the modem.  
Check for loose connections between the modem and the computer, the tele-  
phone jack, and AC power.  
You might have had a poor connection because of line conditions or the problem  
might have originated on the other end of the line. Try again.  
If you were online with a BBS or an online service like CompuServe, it might  
have hung up on you because of lack of activity on your part or because you ex-  
ceeded your time limit for the day. Try again.  
57  
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
5 Solving Problems  
Th e M o d e m Ca n n o t Co n n ec t W h e n  
An s w e r in g  
Autoanswer might be disabled. Turn on autoanswer in your datacomm program  
or send the command ATS0=1 (ATS0=2 if you have Caller ID service) to your  
modem in terminal mode.  
File Tr a n s fe r Is Slo w e r T h a n It Sh o u ld Be  
You might have an older UART. For best throughput, install a 16550AFN UART  
or a Multi-Tech ISI serial port card. See the “Quick Start” chapter for information  
on how to identify your UART.  
If you are running under Windows 3.1 and have a 16550AFN UART, you must  
replace the Windows serial driver, COMM.DRV, to take full advantage of the  
UART’s speed.  
If you are using a slow transfer protocol, such as Xmodem, try Zmodem or Ymo-  
dem/ G instead.  
Is your line noisy? If there is static on your line, the modem has to resend many  
blocks of data to insure accuracy. You must have a clean line for maximum  
speed.  
Are you downloading a compressed file with MNP 5 hardware compression en-  
abled? Since hardware data compression cannot compress a file already  
compressed by an archiving program, the transfer can be marginally slower with  
data compression enabled than with it disabled.  
Does your Internet service provider (ISP) use the same 56K protocol as your mo-  
dem? The default setting of your modem is to connect using either the K56flex or  
the V.90 protocol, depending on which one the ISP modem is using. If your ISP  
uses the X2 protocol, the maximum speed you will be able to connect at is 33,600  
bps. Check with your ISP to see which protocols it supports.  
Try entering the &V1 command to display information about the last connection,  
making a screen print of the connection statistics, and checking for parameters  
that might be unacceptable.  
Da t a Is Be in g Lo s t  
If you are using data compression and a high speed serial port, set the serial port  
baud rate to four times the data rate.  
Your UART might not be reliable at serial port speeds over 9600 bps or 19,200  
bps. Turn off data compression, reset your serial port speed to a lower rate, or  
replace your serial port with a faster one.  
Make sure the flow control method you selected in software matches the method  
selected in the modem. If you are using the modem with a Macintosh, you might  
have the wrong cable for hardware flow control.  
58  
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
5 Solving Problems  
If you are running under Windows 3.1 and have a 16550AFN UART, you might  
need to turn on the 16550s data buffers and/ or replace the Windows serial driv-  
er, COMM.DRV.  
Try entering the &V1 command to display information about the last connection,  
making a screen print of the connection statistics, and checking for parameters  
that might be unacceptable.  
Th e r e Ar e Ga r b a ge Ch a r a ct e r s o n t h e M o n it o r  
Your computer and the remote computer might be set to different word lengths,  
stop bits, or parities. If you have connected at 8-N-1, try changing to 7-E-1, or  
vice-versa, using your communications software.  
You might be experiencing line noise. Enable error correction, if it is disabled, or  
hang up and call again; you might get a better connection the second time.  
At speeds above 2400 bps, the remote modem might not use the same transmis-  
sion or error correction standards as your modem. Try connecting at a slower  
speed or disabling error correction. (With no error correction, however, line noise  
can cause garbage characters.)  
Try entering the &V1 command to display information about the last connection,  
making a screen print of the connection statistics, and checking for parameters  
that might be unacceptable.  
Th e M o d e m Do e s n t Wo r k w it h Ca lle r ID  
Caller ID information is transmitted between the first and second rings, so if  
autoanswer is turned off (S0=0) or if the modem is set to answer after only one  
ring (S0=1), the modem will not receive Caller ID information. Check your ini-  
tialization string, and if necessary change it to set the modem to answer after the  
second ring (S0=2).  
Make sure that you have Caller ID service from your telephone company.  
Fa x a n d Da t a So ft w a r e Ca n t Ru n a t t h e Sa m e  
Tim e  
Communications devices can be accessed by only one application at a time. Un-  
der DOS or Windows 3.1x, you can run either your fax software or your  
datacomm software, but not both at the same time, unless you have a special  
communications device management application. In Windows 95, you can have  
data and fax communication applications open at the same time, but they cannot  
use the same modem at the same time.  
59  
Multi-Tech Systems, Inc.  
 
Ap p e n d ixe s  
 
MultiModemDSVD User Guide  
A Regulatory Compliance  
Ap p e n d ix A: Re g u la t o r y Co m p lia n ce  
FCC Pa r t 6 8 Te le co m  
1. This equipment complies with part 68 of the Federal Communications Commis-  
sion Rules. On the outside surface of this equipment is a label that contains,  
among other information, the FCC registration number. This information must  
be provided to the telephone company.  
2. The suitable USOC jack (Universal Service Order Code connecting arrangement)  
for this equipment is shown below. If applicable, the facility interface codes  
(FIC) and service order codes (SOC) are shown.  
3. An FCC-compliant telephone cord and modular plug is provided with this  
equipment. This equipment is designed to be connected to the telephone net-  
work or premises wiring using a compatible modular jack that is Part 68 compli-  
ant. See installation instructions for details.  
4. The ringer equivalence number (REN) is used to determine the number of devic-  
es that may be connected to the telephone line. Excessive RENs on the telephone  
line may result in the device not ringing in response to an incoming call. In  
most, but not all, areas the sum of the RENs should not exceed 5.0. To be certain  
of the nuber of devices that may be connected to the line, as determined by the  
total RENs, contact the local telephone company.  
5. If this equipment causes harm to the telephone network, the telephone company  
will notify you in advance that temporary discontinuance of service may be re-  
quired. But if advance notice is not practical, the telephone company will notify  
you as soon as possible. Also, you will be advised of your right to file a com-  
plaint with the FCC if you believe it is necessary.  
6. The telephone company may make changes in its facilities, equipment, opera-  
tions, or procedures that could affect the operation of the equipment. If this hap-  
pens, the telephone company will provide advance notice in order for you to  
make necessary modifications in order to maintain uninterrupted service.  
7. If trouble is experienced with this equipment (the model of which is indicated  
below) please contact Multi-Tech Systems, Inc. at the address shown below for  
details of how to have repairs made. If the trouble is causing harm to the tele-  
phone network, the telephone company may request you remove the equipment  
from the network until the problem is resolved.  
8. No repairs are to be made by you. Repairs are to be made only by Multi-Tech  
Systems or its licensees. Unauthorized repairs void registration and warranty.  
9. This equipment should not be used on party lines or coin lines.  
61  
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
A Regulatory Compliance  
10. If so required, this equipment is hearing-aid compatible.  
Manufacturer:  
Multi-Tech Systems, Inc.  
Model Number:  
MT5600DSVD  
FCC Registration No:  
Ringer Equivalence:  
Modular Jack (USOC):  
AU7USA-24713-M5-E  
0.3B  
RJ11C or RJ11W (single line)  
Service Center in USA:  
Multi-Tech Systems, Inc.  
2205 Woodale Drive  
Mounds View, MN 55112  
U.S.A.  
(763) 785-3500  
(763) 785-9874 Fax  
FCC Pa r t 15  
This equipment has been tested and found to comply with the limits for a Class B  
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to  
provide reasonable protection against harmful interference in a residential installa-  
tion. This equipment generates, uses, and can radiate radio frequency energy, and if  
not installed and used in accordance with the instructions, may cause harmful inter-  
ference to radio communications. However, there is no guarantee that interference  
will not occur in a particular installation. If this equipment does cause harmful inter-  
ference to radio or television reception, which can be determined by turning the  
equipment off and on, the user is encouraged to try to correct the interference by one  
or more of the following measures:  
• Reorient or relocate the receiving antenna.  
• Increase the separation between the equipment and receiver.  
• Plug the equipment into an outlet on a circuit different from that to which the re-  
ceiver is connected.  
• Consult the dealer or an experienced radio/ TV technician for help.  
This device complies with Part 15 of the FCC rules. Operation of this device is sub-  
ject to the following conditions: (1) This device may not cause harmful interference,  
and (2) this device must accept any interference that may cause undesired operation.  
WARNING: Changes or modifications to this unit not expressly approved by the  
party responsible for compliance could void the users authority to operate the  
equipment.  
In d u s t r y Ca n a d a  
This Class B digital apparatus meets all requirements of the Canadian Interference-  
Causing Equipment Regulations.  
Cet appareil numérique de la classe B respecte toutes les exigences du Reglement  
Canadien sur le matériel brouilleur.  
62  
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
A Regulatory Compliance  
Fa x Br a n d in g St a t e m e n t  
The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to  
use a computer or other electronic device, including fax machines, to send any mes-  
sage unless such message clearly contains the following information:  
• Date and time the message is sent  
• Identification of the business or other entity, or other individual sending the  
message  
• Telephone number of the sending machine or such business, other entity, or  
individual  
This information is to appear in a margin at the top or bottom of each transmitted  
page or on the first page of the transmission. (Adding this information in the margin  
is referred to as fax branding.)  
Since any number of fax software packages can be used with this product, the user  
must refer to the fax software manual for setup details. Typically the fax branding  
information must be entered via the configuration menu of the software.  
Ca n a d ia n Lim it a t io n s No t ice  
Notice: The ringer equivalence number (REN) assigned to each terminal device pro-  
vides an indication of the maximum number of terminals allowed to be connected to  
a telephone interface. The termination on an interface may consist of any combination  
of devices subject only to the requirement that the sum of the ringer equivalence  
numbers of all the devices does not exceed 5.  
Notice: The Industry Canada label identifies certificated equipment. This certifica-  
tion means that the equipment meets certain telecommunications network protec-  
tive, operational and safety requirements. The Industry Canada label does not  
guarantee the equipment will operate to the users satisfaction.  
Before installing this equipment, users should ensure that it is permissible to be con-  
nected to the facilities of the local telecommunications company. The equipment  
must also be installed using an acceptable method of connection. The customer  
should be aware that compliance with the above conditions may not prevent degra-  
dation of service in some situations. Repairs to certified equipment should be made  
by an authorized Canadian maintenance facility designated by the supplier. Any re-  
pairs or alterations made by the user to this equipment or equipment malfunctions  
may give the telecommunications company cause to request the user to disconnect  
the equipment.  
Users should ensure for their own protection that the electrical ground connections  
of the power utility, telephone lines and internal metallic water pipe system, if  
present, are connected together. This precaution may be particularly important in  
rural areas.  
Caution: Users should not attempt to make such connections themselves, but should  
contact the appropriate electric inspection authority, or electrician, as appropriate.  
63  
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
A Regulatory Compliance  
EMC, Sa fe t y, a n d R&TTE Dir e c t ive Co m p lia n ce  
The CE mark is affixed to this product to confirm compliance with the following  
European Community Directives:  
Council Directive 89/ 336/ EEC of 3 May 1989 on the approximation of the laws of  
Member States relating to electromagnetic compatibility;  
and  
Council Directive 73/ 23/ EEC of 19 February 1973 on the harmonization of the  
laws of Member States relating to electrical equipment designed for use within  
certain voltage limits;  
and  
Council Directive 1999/ 5/ EC of 9 March 1999 on radio equipment and telecom-  
munications terminal equipment and the mutual recognition of their conformity.  
In t e r n a t io n a l M o d e m Re s t r ic t io n s  
Some dialing and answering defaults and restrictions may vary for international  
modems. Changing settings may cause a modem to become non-compliant with  
national telecom requirements in specific countries. Also note that some software  
packages may have features or lack restrictions that may cause the modem to be-  
come non-compliant.  
64  
Multi-Tech Systems, Inc.  
 
MultiModemDSVD User Guide  
B Technical Specifications  
Ap p e n d ix B: Te ch n ica l Sp e c if ica t io n s  
Your MultiModemDSVD modem meets the following specifications:  
Trade Name  
MultiModemDSVD™  
Model Number  
MT5600DSVD or MT5600DSVD2  
Server-to-Client  
Data Rates  
K56flex or V.90 speeds when accessing an ISP type K56flex  
or V.90 server (actual speed depends on server capabilities  
and line conditions) *  
Client-to-Client  
Data Rates  
33,600, 31,200, 28,800, 26,400, 24,000, 21,600, 19,200, 16,800,  
14,400, 12,000, 9600, 7200, 4800, 2400, 1200, 0-300 bps  
Fax Data Rates  
Data Format  
14,400, 9600, 7200, 4800, 2400, 300 bps  
Serial, binary, asynchronous  
Modem Compatibility ITU-T V.90; K56flex; ITU-T V.34 enhanced, V.34, V.32terbo,  
V.32bis, V.32, V.22bis, V.22; Bell 212A and 103/ 113; ITU-T  
V.42, V.42bis; ITU-T V.21 & V.23 in international versions  
Fax Compatibility  
ITU-T Group 3, Class 1 and 2, T.4, T.30, V.21, V.27ter, V.29,  
V.17, and TIA/ EIA TR29.2  
Voice Compatiblity  
Error Correction  
ITU-T V.70 DSVD  
ITU-T V.42 (LAP-M or MNP 3–4)  
ITU-T V.42bis (4:1 throughput), MNP 5 (2:1 throughput)  
Data Compression  
Speed Conversion  
Serial port data rates adjustable to 300, 1200, 2400, 4800,  
9600, 19,200, 38,400, 57,600, 115,200, and 230,400 bps  
Mode of Operation  
Fax online modes; full duplex over dial-up lines; AT and  
AT#V command modes supporting answering machine and  
voice mail functions  
Flow Control  
XON/ XOFF (software), RTS/ CTS (hardware)  
Intelligent Features  
Plug and play; fully AT command compatible; autodial, re-  
dial, repeat dial; pulse or tone dial; dial pauses; auto an-  
swer; caller ID; EIA extended automode; adaptive line  
probing; automatic symbol and carrier frequency during  
start-up, retrain, and rate renrgotiation; DTMF detection;  
call status display, auto-parity and data rate selections; key-  
board-controlled modem options; non-volatile memory; on-  
screen displays for modem option parameters; command  
lines of up to 40 characters each.  
Command Buffer  
40 characters  
*Though these modems are capable of 56K bps download performance, line impairments,  
public telephone infrastructure and other external technological factors currently prevent  
maximum 56K bps connections.  
Multi-Tech Systems, Inc.  
65  
 
MultiModemDSVD User Guide  
B Technical Specifications  
Data Modulation  
FSK at 300 bps, PSK at 1200 bps, QAM at 2400, 4800, and  
9600 bps (non-trellis), QAM with trellis-coded modulation  
(TCM) at 9600, 12,000, 14,400, 16,800, 19,200, 21,600, 24,000,  
26,400, 28,800, 31,200, 33,600, and 56,000 bps  
Fax Modulation  
V.21 CH2 FSK at 300 bps (half duplex)  
V.27ter DPSK at 4800 and 2400 bps  
V.29 QAM at 9600 and 7200 bps  
V.17TCM at 14400, 12000, 9600, and 7200 bps  
Carrier Frequencies  
ITU-T V.34  
1600, 1646, 1680, 1800, 1829, 1867, 1920,  
1959, 2000 Hz  
Carrier Frequencies  
AT&T V.32 terbo/  
ITU-T V.32bis/V.32  
1800 Hz  
Carrier Frequencies  
V.22bis/V.22 or  
Bell 212A Standard  
(2400 & 1200 bps)  
Transmit originate: 1200 Hz  
Transmit answer: 2400 Hz  
Receive originate: 2400 Hz  
Receive answer:  
1200 Hz  
Carrier Frequencies  
ITU-T V.23  
Transmit originate: 390 Hz mark  
450 Hz space  
(1200 bps)  
Receive originate: 1300 Hz mark  
2100 Hz space  
Transmit answer: 1300 Hz mark  
2100 Hz space  
Receive answer:  
390 Hz mark  
450 Hz space  
Carrier Frequencies  
ITU-T V.21  
Transmit originate: 980 Hz mark  
1180 Hz space  
(0–300 bps)  
Receive originate: 1650 Hz mark  
1850 Hz space  
Transmit answer: 1650 Hz mark  
1850 Hz space  
Receive answer:  
980 Hz mark  
1180 Hz space  
Carrier Frequencies  
Bell 103/113  
Transmit originate: 1270 Hz mark  
1070 Hz space  
(0–300 bps)  
Receive originate: 2225 Hz mark  
2025 Hz space  
Transmit answer: 2225 Hz mark  
2025 Hz space  
Receive answer:  
1270 Hz mark  
1070 Hz space  
Fax Carrier  
Frequencies  
V.21 Ch2 (half duplex):  
1650 Hz mark, 1850 HZ space for transmit  
originate  
1650 HZ mark, 1850 Hz space for transmit  
answer  
V.27ter: 1800 Hz originate/ answer  
V.29 QAM: 1800 Hz originate/ answer  
V.17 TCM: 1800 Hz originate/ answer  
Multi-Tech Systems, Inc.  
66  
 
MultiModemDSVD User Guide  
B Technical Specifications  
Voice Compression  
and Sampling Rate  
PCM 128, 8000 Hz, or IMA ADPCM, 8000 Hz, (selectable  
via #V commands). Note that your computer system should  
have a processing speed of at least 75 MHz to take full ad-  
vantage of the telephony features of this product.  
Transmit Level  
-11 dBm (dial-up)  
Frequency Stability  
Receiver Sensitivity  
±0.01%  
-43 dBm under worst-case conditions  
AGC Dynamic Range 43 dB  
Impedances  
Microphone input: 2.2 kW (MT5600DSVD only)  
Speaker output:  
50W (MT5600DSVD only)  
Interface  
EIA RS-232C/ ITU-T V.24/ V.28  
Connectors  
DB25 RS-232C connector; two RJ-11 phone jacks (one RJ-11  
jack on UK and international modems), power jack; 1/ 8-  
inch stereo speaker jack and microphone jack.  
Cables  
One RJ-11 phone cable (USA); country-specific cord for UK  
and International models; external power transformer and  
cord  
Note: Any cables connected to the computer should be  
shielded to reduce interference.  
Diagnostics  
Indicators  
Power-on self test, local analog loop, local digital loop, re-  
mote digital loop.  
LEDs for Transmit Data, Receive Data, Carrier Detect, 56K  
bps, 33.6K bps, 14.4K bps, Off Hook, Terminal Ready, Error  
Correction, Fax.  
Speaker  
Command-controlled 2-inch speaker for call progress moni-  
toring.  
Manual Control  
Environmental  
ON/ OFF power switch  
Temperature range 0°–50°C (32°–120°F); humidity range  
20–90% (non-condensing)  
Power Requirements  
100–130VAC, 50/ 60 Hz, 5 W; two-prong outlet-mounted  
transformer (included); 230V/ 50 Hz optional (international)  
Power Consumption  
Dimensions  
9 VDC, 300 mA maximum transformer output  
10.8 cm wide x 14.8 cm long x 2.9 cm high (4.25" x 5.8" x  
1.15")  
Weight  
224 g (8 oz)  
10 years  
Limited Warranty  
Multi-Tech Systems, Inc.  
67  
 
MultiModemDSVD User Guide  
C Warranty, Service, and Technical Support  
Ap p e n d ix C: Wa r r a n t y, Se r v ice , a n d  
Te ch n ica l Su p p o r t  
M u lt i-Te c h Sys t e m s, In c . Wa r r a n t y & Re p a ir s Po lic ie s  
Warranty  
Multi-Tech Systems, Inc., (hereafter “MTS”) warrants that its products will be free  
from defects in material or workmanship for a period of two, five, or ten years  
(depending on model) from date of purchase, or if proof of purchase is not  
provided, two, five, or ten years (depending on model) from date of shipment.  
MTS MAKES NO OTHER WARRANTY, EXPRESS OR IMPLIED, AND ALL  
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A  
PARTICULAR PURPOSE ARE HEREBY DISCLAIMED.  
This warranty does not apply to any products which have been damaged by  
lightning storms, water, or power surges or which have been neglected, altered,  
abused, used for a purpose other than the one for which they were manufactured,  
repaired by Customer or any party without MTSs written authorization, or used in  
any manner inconsistent with MTSs instructions.  
MTS’s entire obligation under this warranty shall be limited (at MTSs option) to  
repair or replacement of any products which prove to be defective within the  
warranty period or, at MTSs option, issuance of a refund of the purchase price.  
Defective products must be returned by Customer to MTSs factory – transportation  
prepaid.  
MTS WILL NOT BE LIABLE FOR CONSEQUENTIAL DAMAGES, AND UNDER  
NO CIRCUMSTANCES WILL ITS LIABILITY EXCEED THE PRICE FOR  
DEFECTIVE PRODUCTS.  
Repair Procedures for U.S. and Canadian Customers  
In the event that service is required, products may be shipped, freight prepaid, to  
our Mounds View, Minnesota factory:  
Multi-Tech Systems, Inc.  
2205 Woodale Drive  
Mounds View, MN 55112  
Attn: Repairs, Serial # ____________  
A Returned Materials Authorization (RMA) is not required. Return shipping  
charges (surface) will be paid by MTS.  
Please include, inside the shipping box, a description of the problem, a return  
shipping address (must have street address, not P.O. Box), your telephone number,  
and if the product is out of warranty, a check or purchase order for repair charges.  
warranties  
Extended two-year overnight replacement service agreements are available for  
selected products. Please call MTS at (888) 288-5470, extension 5308 or visit our web  
coverages.  
Multi-Tech Systems, Inc.  
68  
 
MultiModemDSVD User Guide  
C Warranty, Service, and Technical Support  
Please direct your questions regarding technical matters, product configuration,  
verification that the product is defective, etc., to our Technical Support department  
at (800) 972-2439 or email tsupport@multitech.com. Please direct your questions  
regarding repair expediting, receiving, shipping, billing, etc., to our Repair  
Accounting department at (800) 328-9717 or (763) 717-5631, or email  
mtsrepair@multitech.com.  
Repairs for damages caused by lightning storms, water, power surges, incorrect  
installation, physical abuse, or user-caused damages are billed on a time-plus-  
materials basis.  
Repair Procedures for International Customers (Outside U.S.A. and Canada)  
Your original point of purchase Reseller may offer the quickest and most economical  
repair option for your Multi-Tech product. You may also contact any Multi-Tech  
sales office for information about the nearest distributor or other repair service for  
your Multi-Tech product.  
http:/ / www.multitech.com/ COMPANY/ offices/ DEFAULT.ASP  
In the event that factory service is required, products may be shipped, freight  
prepaid to our Mounds View, Minnesota factory. Recommended international  
shipment methods are via Federal Express, UPS or DHL courier services, or by  
airmail parcel post; shipments made by any other method will be refused. A  
Returned Materials Authorization (RMA) is required for products shipped from  
outside the U.S.A. and Canada. Please contact us for return authorization and  
shipping instructions on any International shipments to the U.S.A. Please include,  
inside the shipping box, a description of the problem, a return shipping address  
(must have street address, not P.O. Box), your telephone number, and if the product  
is out of warranty, a check drawn on a U.S. bank or your companys purchase order  
for repair charges. Repaired units shall be shipped freight collect, unless other  
arrangements are made in advance.  
Please direct your questions regarding technical matters, product configuration,  
verification that the product is defective, etc., to our Technical Support department  
nearest you or email tsupport@multitech.com. When calling the U.S., please direct  
your questions regarding repair expediting, receiving, shipping, billing, etc., to our  
Repair Accounting department at +(763) 717-5631 in the U.S.A., or email  
mtsrepair@multitech.com.  
Repairs for damages caused by lightning storms, water, power surges, incorrect  
installation, physical abuse, or user-caused damages are billed on a time-plus-  
materials basis.  
Repair Procedures for International Distributors  
Procedures for International Distributors of Multi-Tech products are on the  
distributor web site.  
http:/ / www.multitech.com/ PARTNERS/ login/  
Copyright ã Multi-Tech Systems, Inc. 2001 10-Sep-01  
O n lin e Wa r r a n t y Re g is t r a t io n  
If you have access to the World Wide Web, you can register your Multi-Tech  
Multi-Tech Systems, Inc.  
69  
 
MultiModemDSVD User Guide  
C Warranty, Service, and Technical Support  
Se r v ice  
U.S. and Canadian Customers  
In the event that service is required, products may be shipped, freight prepaid, to  
our Mounds View, Minnesota, factory:  
Multi-Tech Systems, Inc.  
2205 Woodale Drive  
Mounds View, MN 55112  
Attn: Repairs, Serial #______  
A Returned Materials Authorization (RMA) is not required. Return shipping  
charges (surface) will be paid by MTS. Please include inside the shipping box a  
description of the problem, a return shipping address (must have street address, not  
P.O. Box), a telephone number, and if the product is out of warranty, a check or  
purchase order for repair charges.  
For out of warranty repair charges, go to http://www.multitech.com/documents/  
warranties.  
Extended two-year overnight replacement agreements are available for selected  
products. Please call MTS at 888 288-5470, extension 5308, or visit our web site at  
http://www.multitech.com/PROGRAMS/orc/ for details on rates and coverages.  
Please direct your questions regarding technical matters, product configuration,  
verification that the product is defective, etc., to our Technical Support department  
at 800 972-2439 or e-mail tsupport@multitech.com.  
Please direct your questions regarding repair expediting, receiving, shipping,  
billing, etc., to our Repair Accounting department at 800 328-9717 or +763 785-3500,  
or e-mail mtsrepair@multitech.com.  
Repairs for damages caused by lightning storms, water, power surges, incorrect  
installation, physical abuse, or user-caused damages are billed on a time-plus-  
materials basis.  
International Customers (outside U.S.A. and Canada)  
Your original point of purchase reseller may offer the quickest and most economical  
repair option for your Multi-Tech product. You may also contact any Multi-Tech  
sales office for information about the nearest distributor or other repair service for  
DEFAULT.ASP.  
In the event that factory service is required, products may be shipped, freight  
prepaid, to our Mounds View, Minnesota, factory. Recommended international  
shipment methods are via Federal Express, UPS or DHL courier services, or by  
airmail parcel post; shipments made by any other method will be refused. A  
Returned Materials Authorization (RMA) is required for products shipped from  
outside the U.S.A. and Canada. Please contact us for return authorization and  
shipping instructions on any international shipments to the U.S.A. Please include,  
inside the shipping box, a description of the problem, a return shipping address  
(must have street address, not P.O. Box), your telephone number, and if the product  
is out of warranty, a check drawn on a U.S. bank or your companys purchase order  
for repair charges. Repaired units will be shipped freight collect, unless other  
arrangements are made in advance.  
Please direct questions regarding technical matters, product configuration, verifica-  
tion that the product is defective, etc., to our Technical Support department nearest  
Multi-Tech Systems, Inc.  
70  
 
MultiModemDSVD User Guide  
C Warranty, Service, and Technical Support  
you, as listed at http://www.multitech.com/COMPANY/offices/DEFAULT.ASP., or e-  
mail tsupport@multitech.com. When calling the U.S., please direct questions regarding  
repair expediting, receiving, shipping, billing, etc., to our Repair Accounting depart-  
ment at +763 717-5631 in the U.S.A., or e-mail mtsrepair@multitech.com.  
Repairs for damages caused by lightning storms, water, power surges, incorrect  
installation, physical abuse, or user-caused damages are billed on a time-plus-mate-  
rials basis.  
International Distributors  
Procedures for international distributors of Multi-Tech products are on the Distribu-  
Re p la ce m e n t Pa r t s  
SupplyNet, Inc., can supply you with replacement power supplies, cables and con-  
nectors for selected Multi-Tech products. You can place an order with SupplyNet  
via mail, phone, fax or the Internet at the following addresses:  
Mail:  
SupplyNet, Inc.  
614 Corporate Way  
Valley Cottage, NY 10989  
800 826-0279  
Phone:  
Fax:  
914 267-2420  
Email:  
Internet:  
info@thesupplynet.com  
Te c h n ic a l Su p p o r t  
Multi-Tech Systems has an excellent staff of technical support personnel available to  
help you get the most out of your Multi-Tech product. If you have any questions  
about the operation of this unit, please call 800 972-2439 (USA and Canada) or 763  
785-3500 (international and local). Please have modem information available. You  
can also contact Technical Support by e-mail at the following addresses:  
Country  
Email  
Telephone  
France:  
U.K.:  
U.S.A., Canada  
Rest of world:  
support@multitech.fr  
support@multitech.co.uk  
tsupport@multitech.com  
tsupport@multitech.com  
+(33) 1-64 61 09 81  
+(44) 118 959 7774  
800 972-2439  
+763 717-5863  
Please note the status of the modem before contacting Technical Support. Status  
information can include the state of the LED indicators, screen messages, diagnostic  
test results, problems with a specific application, etc.  
In t e r n e t Sit e s  
Multi-Tech maintains a Web site at  
and an ftp site at  
ftp://ftp.multitech.com  
Multi-Tech Systems, Inc.  
71  
 
MultiModemDSVD User Guide  
D Upgrading the Modem  
Multi-Tech Systems, Inc.  
72  
 

Miele Saw B 895 D User Manual
Newcon Optik Hunting Equipment LRM 220SI User Manual
Nikon Binoculars Laser IRT User Manual
Novatel Wireless Network Router CC208 User Manual
OEM Systems Switch VX 100 User Manual
Omnimount TV Video Accessories TORINO36 User Manual
One for All Universal Remote URC 6690 User Manual
Palm Cell Phone Pre Plus User Manual
Panasonic Vacuum Cleaner MC UG581 User Manual
Patton electronic Surge Protector MODEL 2126 User Manual