Multitech MultiModem MT5634ZPX-PCI-U-NV User manual

MT5634ZPX-PCI-U/NV
MT5634ZPX-PCI-V92/NV
MT5634ZPX-PCI/NV
Internal Data / Super G3 Fax Modem
User Guide

ii
MultiModemZPX User Guide
MT5634ZPX-PCI-U, MT5634ZPX-PCI-U-NV, MT5634ZPX-PCI, 5634ZPX-PCI-NV, MT5634ZPX-PCI-
V92, 5634ZPX-PCI-V92-NV
P/N S000197C Revision C
Copyright © 2003 by Multi-Tech Systems, Inc.
All rights reserved. This publication may not be reproduced, in whole or in part, without prior expressed
written permission from Multi-Tech Systems, Inc.
Multi-Tech Systems, Inc. makes no representations or warranties with respect to the contents hereof and
specifically disclaims any implied warranties of merchantability or fitness for any particular purpose.
Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes
in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization
of such revisions or changes.
Record of Revisions
Revision Date Description
C07/25/03 This manual replaces S000197B. It covers V.90, V.92, and Universal builds. It notes
that the modem can be purchased with or without voice.
Trademarks
MultiModemZPX, Multi-Tech, and the Multi-Tech logo are trademarks of Multi-Tech Systems, Inc.
Adobe and Acrobat are trademarks of Adobe Systems Incorporated. MNP is a trademark of Microcom,
Inc. Microsoft, Windows, Windows 98, Windows Me, Windows NT, Windows 2000, and XP are either
registered trademarks or trademarks of Microsoft Corporation in the United States and/or other coun-
tries. All other brand and product names mentioned in this publication are trademarks or registered
trademarks of their respective companies.
Patents
This device is covered by one or more of the following patents: 6,031,867; 6,012,113; 6,009,082; 5,905,794;
5,864,560; 5,815,567; 5,815,503; 5,812,534; 5,809,068; 5,790,532; 5,764,628; 5,764,627; 5,754,589; 5,724,356;
5,673,268; 5,673,257; 5,644,594; 5,628,030; 5,619,508; 5,617,423; 5,600,649; 5,592,586; 5,577,041; 5,574,725;
5,559,793; 5,546,448; 5,546,395; 5,535,204; 5,500,859; 5,471,470; 5,463,616; 5,453,986; 5,452,289; 5,450,425;
5,355,365; 5,309,562; 5,301,274. Other patents pending.
Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, MN 55112
U.S.A
Telephone [phone] or [phone]
Fax [phone]
Technical Support [phone]
Internet http://www.multitech.com

Contents
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MultiModemZPX User Guide
Contents
Chapter 1 - Introduction ......................................................................................... 1
Product Description ........................................................................................................ 1
Chapter 2 - Installation ........................................................................................... 2
What You Will Need ....................................................................................................... 2
Safety Warnings ............................................................................................................... 2
Step 1: Install the MultiModemZPX in your Computer ............................................ 3
Step 2: Make the External Connections ........................................................................ 4
Step 3: Install the Modem Driver .................................................................................. 5
Step 4: Configure the Modem for Your Country ........................................................ 9
Step 5: Install PhoneTools ............................................................................................ 10
Chapter 3 - Remote Configuration ..................................................................... 11
Basic Procedure .............................................................................................................. 11
Setup ................................................................................................................................ 11
To Change the Remote Escape Character .................................................................. 12
Chapter 4 - Troubleshooting ................................................................................ 13
The Modem Does Not Respond to Commands ........................................................ 13
The Modem Cannot Connect When Dialing ............................................................. 14
The Modem Disconnects While Online ...................................................................... 15
The Modem Cannot Connect When Answering ....................................................... 16
File Transfer Is Slower Than It Should Be .................................................................. 16
Data Is Being Lost .......................................................................................................... 16
There Are Garbage Characters on the Monitor ......................................................... 17
The Modem Doesn’t Work with Caller ID ................................................................. 17
Fax and Data Software Can’t Run at the Same Time ............................................... 17
The Voice Functions Don’t Work ................................................................................ 17
Voice Mail Test............................................................................................................... 17
Loopback Test ................................................................................................................ 18
Speakerphone Test (with voice option) ...................................................................... 18
Appendix A - Regulatory Compliance............................................................... 19
FCC Part 68 Telecom ..................................................................................................... 19
FCC Part 15 .....................................................................................................................20
Fax Branding Statement ............................................................................................... 20
Canadian Limitations Notice ....................................................................................... 21
Industry Canada ............................................................................................................ 21
Protection Against Contact with TNV Circuit .......................................................... 21
EMC, Safety, and R&TTE Directive Compliance...................................................... 22
New Zealand Telecom Warning Notice ..................................................................... 22
South African Notice ..................................................................................................... 23
International Modem Restrictions .............................................................................. 23
Appendix B - Technical Specifications.............................................................. 24
Appendix C - Warranty, Service, and Technical Support .............................. 26
Limited Warranty .......................................................................................................... 26
Online Warranty Registration ..................................................................................... 26

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Service ............................................................................................................................. 26
Technical Support .......................................................................................................... 28
Internet Sites ................................................................................................................... 28
Appendix D - Upgrading the Modem ................................................................ 29
Introduction ....................................................................................................................29
Upgrade Overview ........................................................................................................ 29
Step 1: Identify the Modem Firmware ....................................................................... 29
Step 2: Identify the Current Firmware Version ......................................................... 30
Step 3: Download the Upgrade File ............................................................................ 30
Step 4: Extract the Upgrade Files ................................................................................ 30
Step 5: Document and Clear Your Stored Paramenters ........................................... 30
Step 6: Upgrade the Modem’s Firmware ................................................................... 31
Step 7: Restore Your Parameters ................................................................................. 31
Appendix E - Installing Under Linux ................................................................ 32
Introduction ....................................................................................................................32
Standard Linux Serial Port Definitions ...................................................................... 32
Installation ...................................................................................................................... 32
Setup ................................................................................................................................ 32
Using the Terminal Program Minicom to Verify Operation ................................... 33
Using the Modem to Call the Internet ........................................................................ 33
Calling the ISP ................................................................................................................ 34
Answering Calls ............................................................................................................ 34
Appendix F - Installing Under SCO OpenServer ............................................ 35
Introduction ....................................................................................................................35
Installation ...................................................................................................................... 35
Setup ................................................................................................................................ 35

1 Introduction
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MultiModemZPX User Guide
Chapter 1 - Introduction
Congratulations on your purchase of the MultiModemZPX. You have acquired one of the finest internal
data/fax modems available today from one of the world’s oldest modem manufacturers: Multi-Tech
Systems, Inc. This User Guide will help you to install, configure, test, and use your modem.
This User Guide documents MT5634ZPX-PCI and MT5634ZPX-PCI-NV, which are V.90 protocol. The
NV is for the No Voice option. The MT5634 ZPX-PCI-V.92 and MT5634-PCI-NV-V.92 are V.92 units.
MT5634ZPX-PCI-U and MT5634ZPX-PCI-U-NV are univeral units that can be used in either 3.3 or 5 volt
slots. The universal units are only V.92 protocol.
Product Description
One Modem, Worldwide Use. The MultiModemZPX is designed for global applications. This means
one modem can ship around the world. The global modem is ideal for businesses with global operations
that want to standardize on one modem and are looking to simplify the ordering process. Go to
www.multitech.com/ to see a complete list of all the countries for which this modem has approvals.
V.90/V.92 Build: This modem was first designed using the V.90 protocol. Now, it is available as a V.92.
The MultiModemZPX provides high-speed data transfer and fax capabilities for small businesses,
telecommuters, and SOHO users. Its compatibility with the new ITU-T V.92 protocol provides quick
connections, downstream transmissions at speeds up to 56K bps*, and upstream transmissions at speeds
up to 48K bps when connected to V.92-compatible Internet service providers. Transmissions between the
MultiModemZPX and other client modems are limited to 33.6K bps, as are upstream transmissions to
non-V.92-compatible ISPs and downstream transmissions that are converted more than once on the
telephone network.
Fax Communications: The MultiModemZPX also supports “Super G3”ITU-T V.34 fax communications
at speeds up to 33.6K bps with Class 2.1 fax commands.
Features: Modem features include Plug and Play operation, callback security, and remote configuration.
In standard mode, you can store up to four command lines or telephone numbers of up to 40 characters
each in the modems’nonvolatile memory. In callback security mode, you can store up to 30 passwords
and dialing strings. Other modem capabilities include voice operation using the included software,
AT&T calling card tone detection, pulse and tone dialing, adaptive answer, DTR dialing, U.S. Caller ID
reporting, two-wire leased-line operation, 11-bit operation, V.42 error correction, and V.42bis and V.44
data compression.
NOTE:
*Though this modem is capable of 56K bps download performance, line impairments, public telephone
infrastructure, and other external technological factors currently prevent maximum 56K bps connec-
tions.

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Chapter 2 - Installation
What You Will Need
Before starting, please make sure you have everything you need:
We supply
An MT5634ZPX-PCI data/fax modem
An RJ-11 telephone cable
A printed Quick Start Guide
An MultiModemZPX system CD containing modem drivers, this User Guide, PhoneTools (a data
communications software program), and Adobe Acrobat Reader
You supply
A 100-MHz or faster Pentium personal computer with an unused PCI expansion slot. For video
conferencing, we recommend a 166-MHz or faster computer.
Windows 98, NT, 2000, ME, XP or Linux (2.2.x kernal) operating system installed
A CD-ROM drive
Tools to open your computer
A nearby telephone line jack
A 3.58mm (9/64-inch) plug male-to-male stereo patch cord (optional)
An external speaker or headphone (optional)
An external microphone (optional)
Safety Warnings
Use this product only with UL- and CUL-listed computers (U.S.A.)
To reduce the risk of fire, use only UL-listed 26 AWG (.41mm) 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.

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Step 1: Install the MultiModemZPX in your Computer
Figure 2-1. The MultiModemZPX.
Installing the MultiModemZPX requires you to open your computer. Please consult your computer
manual in addition to the following instructions.
1. Turn off the computer and unplug it. Failure to do so may result in damage to both the
MultiModemZPX and the computer. Do not turn on the computer until the instructions tell you to do
so.
2. Remove the cover from the computer as instructed in the computer manual.
3. Select an empty PCI expansion slot. Remove the expansion slot cover and save the retaining screw.
4. Before handling the MultiModemZPX, discharge static in your body by touching a metal piece of the
computer chassis. Carefully remove the MultiModemZPX from its antistatic bag, handling it only by
the mounting bracket and edges. Do not touch the gold-plated connectors along the bottom edge.
5. Place the MultiModemZPX directly above the expansion slot and gently, but firmly, push it into the
connector until the card’s retaining bracket is flush against the computer chassis.
6. Fasten the retaining bracket to the computer chassis with the screw saved in step 3.
7. Replace the cover of the computer.

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Step 2: Make the External Connections
Now connect the MultiModemZPX to the telephone line and, optionally, to your telephone. For voice
mail or speakerphone use, you can also connect it to a microphone and an external speaker, headphone,
or sound card. The microphone can be used for recording answering machine messages or for
speakerphone use. The speaker or headphone can be used for playing back messages or as a
speakerphone.
LINE
MIC
LINE
PHONE
Optional Voice
MIC IN
LINE OUT
PHONE
LINE
Figure 2-2. MT5634ZPX connectors.
Line Connection
Plug one end of the provided telephone cable into the modem’s LINE jack, and the other end into a
telephone wall jack. This is the only required connection.
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.
Note: The Federal Communications Commission (FCC) and Industry Canada impose certain
restrictions on equipment connected to public telephone systems.
Phone Connection (Optional)
If you wish to connect a telephone to the same line as the modem, plug it into the modem’s PHONE jack.
Note: The PHONE jack is not interchangeable with the LINE jack. Do not plug the phone into the
LINE jack or the line cable into the PHONE jack.
Microphone Connection (Optional)
For voice mail or speakerphone applications, plug an unamplified microphone into the MIC jack. The
microphone should have a stereo 3.58mm (9/64-inch) mini plug. Do not use a monophonic microphone.

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Sound Card and Speaker Connections (If you have the Voice Option)
For voice mail or speakerphone applications, use a 3.58mm (9/64-inch) plug male-to-male stereo patch
cord to connect the LINE OUT jack on the modem to the LINE IN jack on your sound card. If your sound
card does not have a LINE IN jack, use its MIC jack.
This will allow you to hear modem activity whether it is originating or answering a call, or playing a
recorded message. If you do not have a sound card, you can plug an amplified speaker into the LINE
OUT jack.
Step 3: Install the Modem Driver
If you use Windows 98 or newer, you must install the modem driver. The modem driver tells Windows
how to control the modem. Separate procedures follow for the Windows operating systems. If you use a
Linux operating system, please see Appendix Efor installation instructions. If you use the SCO
OpenServer operating system, please see Appendix G.
Installing the Modem Driver in Windows 98/Me/2000/XP
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.
2. Insert the system CD into your CD-ROM drive, and then click OK.
3. Windows installs the modem driver.
4. Click Finish to exit.
Changing the Windows 98/Me COM Port Assignment
Unlike an external modem, the MultiModemZPX contains its own serial port. When Windows detects
the MultiModemZPX, it assigns the next available COM port to it. Since COM1 through COM4 are
standard serial ports in Windows computers, Windows typically assigns COM5 to the modem’s serial
port.
If Windows assigns the modem to a COM port higher than 4, then certain legacy software applications will
not recognize the modem. To correct this situation, Multi-Tech Systems provides two additional driver
files on the MultiModemZPX CD that may be used to reassign the modem to either COM3 or COM4. To
reassign the COM port:
1. Insert the MultiModemZPX CD into your computer’s CD-ROM drive.
2. Click Start | Settings | Control Panel. Double-click the System icon.
3. Select the Device Manager tab, and double-click the Modem icon.
4. Double-click MT5634ZPX-PCI to go to the Properties dialog box.
5. Select the Driver tab. Click the Update Driver button and follow the Update Device Driver wizard
prompts. The wizard requests you to specify the path of the new driver. If you’d like to reassign your
modem to COM3, type D:\COM-3\pcicom3.inf, where D: is the drive letter associated with your
computer’s CD-ROM drive. If you want to reassign your modem to COM4, type D:\COM-
4\pcicom4.inf and continue with the wizard’s instructions.
6. When the wizard completes its installation, your modem should be reassigned to the new COM port.

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Verifying the Windows 98/Me Configuration
Windows assigns an interrupt request (IRQ) number for your modem. Because the number of IRQs is
limited, a computer with several accessories may not have an available IRQ for your new modem. In
that case, you may have to decide which of your other accessories you can modify or do without.
Be aware that resource settings should be changed only by users with expert knowledge of computer
hardware and hardware configurations.
Note: Changing resource settings improperly can disable your hardware and can cause your computer
to malfunction or be inoperable.
Use the following procedure to check the assignments Windows has made for your modem:
1. Click Start | Settings | Control Panel. Double-click the System icon.
2. When the System Properties dialog box appears, click the Device Manager tab. A list of device types
appears.
3. Double-click Modem to display a list of modems installed in your computer.
4. Double-click Multi-Tech Systems MT5634ZPX-PCI. The Modem Properties dialog box appears.
5. Click the Resources tab and note the Conflicting Device list. If there is a conflict between your
modem and another device in your computer, the information appears here. For help in resolving a
conflict, click Start | Help, and then search the Help index for the Hardware Conflict Troubleshooter.
When finished, click OK to exit the System Properties dialog box.
6. In Control Panel, double-click the Modems icon.
7. When the Modems Properties dialog box appears, click the Diagnostics tab. A list of ports and
devices appears.
8. Highlight the COM port associated with the MT5634ZPX-PCI. Click More Info. Clicking More
Info causes Windows to send commands to and receive responses from the modem. The system also
displays information about the modem’s COM port.
9. Write down the modem’s port, interrupt, address, and highest speed. You will need this information
to configure any legacy (nonWindows) communications software you install.
Port: COM ______ Interrupt: _______ Address: _________ Speed: _________
10. Click the General tab. Select Multi-Tech Systems MT5634ZPX-PCI, and click Properties to review
the modem’s default communications settings. Do not change any settings unless you have special
requirements.
11. Click Dialing Propertiesand review your dialing settings. If you are required to dial 9to get an
outside line, type 9in the local and long distance boxes. If you have Call Waiting service, disable
Call Waiting to prevent it from interrupting a data or fax transmission. When you are finished, click
OK to exit the dialog box.

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Installing the Modem Driver in Windows NT 4.0
Before you begin a Windows NT installation, make sure Windows NT Service Pack 3 or newer is installed
on the computer. Also, to add and remove devices you must be logged on with Administrator privileges.
1. After installing the MultiModemZPX modem into your computer, turn the computer on and allow
Windows NT to start.
2. Insert the MultiModemZPX system CD into your computer’s CD-ROM drive.
3. When the MT5634ZPX-PCI Autorun menu appears, choose Windows NT Setup.
4. The Multi-Tech Systems NT4 PCI Modem Setup dialog box
5. Now click Install. The MT5634ZPX-PCI-V92 driver is installed on the selected COM port.
6. When a message asking you to restart the computer appears, remove the CD from the CD-ROM
drive, and then click OK to restart the computer.
Remote Access Setup
Before you can use your modem, Dial-Up Networking must be installed, and the new modem must be
selected as the Remote Access Service device.
Verifying the Windows NT Configuration
To verify your modem configuration in Windows NT:
1. Click Start |Settings |Control Panel. Double-click Modems.
2. The Modem Properties dialog box appears, showing the COM port associated with the modem.
3. Click Properties. View the General tab to display information about modem speed. Click the
Connection tab to see information about connection and call preferences.
You can also view configuration information under NT’s Remote Access Services, by clicking
Start |Settings |Control Panel. Double-click the Network tab. Click the Services tab, Highlight
Remote Access Services and then click Properties. The list of modems and associated COM ports
appears.

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Verifying the Windows 2000 Configuration
To verify your modem adapter configuration in Windows 2000:
1. Click Start | Settings | Control Panel. Double-click Phone and Modem Properties.
2. In the Phone and Modem Properties dialog box, click the Modems tab.
3. In the Modem tab, select Multi-Tech Systems MT5634ZPX-PCI,and then click the
Diagnostics tab and then click the Query Modem button to display information about your
modem settings.
Windows 2000 automatically configures Plug and Play devices such as the MultiModemZPX to
work properly with other devices installed in your computer.
Viewing System Resources
1. Click Start | Settings | Control Panel.
2. Double-click System, and then click the Hardware tab.
3. Click Device Manager.
4. Click the Action tab to display information about Device Manager options.
Removing Previous Modems from Windows 2000
1. To remove a modem adapter from Windows 2000, click Start | Settings | Control Panel. Double-
click Add/Remove Hardware.
2. The Add/Remove Hardware Wizard displays. Click Next.
3. When the Choose Hardware Task dialog box displays, select Uninstall/Unplug a device.
4. In the Choose a Removal Task dialog box, select Uninstall a device, and then click Next.
5. The Installed devices on your computer dialog box provides a list of devices installed on your
computer. Select the device you want to uninstall from the list. Click Next.
6. In the Uninstall a Device dialog box, verify that the correct device is highlighted, and then select
Yes. Click Next to continue.
7. When the Completing the Add/Remove Hardware dialog box indicates Windows has successfully
uninstalled the device, click Finish.
Note: If you are removing a Plug and Play device from Windows 2000, you must physically
remove the device from the computer or Windows 2000 will request driver installation each time
the system starts.

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Step 4: Configure the Modem for Your Country
Before you use your modem, you must configure it for the country in which it will be used. You must
also do this if you move the modem to another country after it has been configured for the first country.
You can use one of two configuration methods: the Global Wizard utility or AT commands.
The Global Wizard Utility
The Global Wizard configuration utility is recommended for computers running Windows 98 or newer.
1. Insert the MultiModemZPX CD into the CD-ROM drive. The Autorun menu should appear.
2. Click Initial Setup and Country Selection.
3. In the Global Wizard dialog box, select either Run from CD or Install on your PC. Choose the
former to configure your modem without installing the Global Wizard on your computer. Choose the
latter to install the Global Wizard on you computer and Start menu.
4. Click Next. The Global Wizard searches for your modem and identifies it.
5. Click Next.
6. Select the country in which the modem will be used, and then click Next.
7. Review your choice of country. If it is correct, click Next to configure the modem.
8. When Global Wizard announces that the parameters have been set, click Finish to exit.
AT Commands
Non-Windows users can configure the modem using AT commands. You must enter these commands in
your communication program’s terminal window.
There is a separate document of AT Commands provided for reference on the MultiModem system CD.
1. Run your favorite communication program, and open the program’s terminal window.
2. To configure the modem for a specific country, type AT%T19,0,nn, where nn is the country code in
hexadecimal notation, and then press Enter.
3. To verify the change, type ATI9, and then press Enter. The country code is displayed in decimal
format.
Example of country, command and result codes
Country AT command Result code
(hexadecimal) (decimal)
Euro/NAM AT%T19,0,34 (default) 52
Japan AT%T19,0,10 16
A complete list of country codes can be found on the Multi-Tech Web site at
http://www.multitech.com/GlobalModem/config.

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Step 5: Install PhoneTools
You can use PhoneTools to setup the operation of your modem. Multi-Tech includes this data
communications software program on the product CD shipped with your modem. In general, the
modem will work with most data communications software programs. Data communications software
gives you access to commands that govern how the modem operates; that is, how the modem handles
incoming and outgoing data streams, etc.
1. Insert the MultiModemZPX system CDinto your CD-ROM drive. Allow Autorun to bring up the
introductory screen.
2. Click on the PhoneTools icon and choose the appropriate country/language.
3. Follow the PhoneTools installation wizard. No input is needed. You may choose to view the
“Readme”file and whether or not to run PhoneTools immediately.
Windows NT/2000/XP Note: During installation, an advisory screen may appear saying “FAX
capture driver installation”- this may cause a delay in the installation. This is normal. The
installation process has not failed or stalled. Simply wait a few moments until this screen
disappears.
4. After installation, you can launch PhoneTools either from a desktop icon or from the Start |
Programs menu. Typically, it’s not necessary to reboot before using PhoneTools.

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Chapter 3 - Remote Configuration
Remote configuration is a network management tool that allows you to configure the MT5634ZPX
modem anywhere in your network from one location. With password-protected remote configuration, you
can issue AT commands to a remote modem for maintenance or troubleshooting as if you were on site.
Basic Procedure
The following steps are valid regardless of whether the connection is established by the local or the
remote Multi-Tech modem.
Note: For this procedure, the remote computer must be running, and a communication program
must be ready for a data connection, which will be indicated by a lighted TR indicator on the front
of the modem.
1. Establish a data connection with a remote MT5634ZPX.
2. Send three remote configuration escape characters followed by AT and the setup password, and
press ENTER. Example: %%%ATMTSMODEM. You have four tries to enter the correct password
before being disconnected. If the password is correct, the remote modem responds with OK.
3. Type AT commands to configure the remote modem.
4. When you have finished configuring the remote modem, save the new configuration by typing
AT&W0 and pressing ENTER.
5. Type ATO and press ENTER to exit remote configuration. You can now break the connection in the
normal way.
Setup
Multi-Tech modems are shipped with a default setup password (MTSMODEM). Because anyone who has
the User Guide knows the default setup password, you should change the password and possibly also the
remote configuration escape character.
To Change the Setup Password
1. Open a data communications program such as HyperTerminal or PhoneTools.
2. In the terminal window, type AT#SMTSMODEM (or AT#Sxxxxxxxx if you have replaced the
MTSMODEM password with xxxxxxxx) and press ENTER. The modem responds with OK if the setup
password is correct, and ERROR if it is wrong.
3. To change the password, type AT#S=xxxxxxxx, where xxxxxxxx stands for the password, and then
press ENTER. The password can include any keyboard character, and can be up to eight characters
long. The modem responds with OK.
CAUTION: Passwords are case-sensitive. The next time you enter the password, it must be in the
same case as you set it up.
4. The new password is saved automatically. You can now either enter more AT commands or exit the
data communications program. The next time you wish to set up the modem, you must use the new
password.

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To Change the Remote Escape Character
To further improve security, you can change a remote modem’s remote configuration escape character
either locally or remotely. The remote configuration escape character is stored in register S9. The factory
default is 37, which is the ASCII code for the percent character (%). Setting S9 to 0 (zero) disables remote
configuration entirely.
CAUTION: If you do this remotely, you won’t be able to change it back remotely.
1. Establish a remote configuration link with the remote modem as described in “Basic Procedure.”
2. Type ATS9=n, where nis the ASCII code for the new remote configuration escape character, and
then press ENTER.
3. Save the new value by typing AT&W and pressing ENTER.
4. Type ATO and press ENTER to exit remote configuration.

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Chapter 4 - Troubleshooting
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. However, it is more likely that the source of your problem lies
elsewhere. The following symptoms are typical of problems you might encounter:
•The modem does not respond to commands.
•The modem cannot connect when dialing.
•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 doesn’t work with Caller ID.
•Fax and data software can’t run at the same time.
•The voice functions don’t work.
If you experience problems, please check the following possibilities before calling Technical Support (see
Appendix D).
The Modem Does Not Respond to Commands
•Make sure you are issuing the modem commands from 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 from your modem, your connections are
good and the problem likely is in the connection setup in your communications
software.
•If you don’t get an OK, make sure you have properly configured the port in your com
munications program. Most legacy (prior to Windows 95) communications programs
connect to the COM port when the software loads and remain connected until the
program terminates. Some programs can disconnect without exiting the program. If this
is the case, try issuing the software’s connection command. If more than one
communications program is open, they may conflict with each other. Make sure all other
communications programs are closed, and then try to make the connection again.
•Your communication software settings might not match the port the modem is
connected to. Make sure the COM port you chose during setup matches the COM port set
in your communications software. See Chapter 2 for more information.
Another expansion card, such as a sound or game card, might be using the same
COM port, memory address, or interrupt request (IRQ) as your
modem. See Chapter 2 for information on verifying the configuration

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for your operating system. Look for conflicts with other devices installed on your
computer. Resources are assigned at power-up by the computer’s BIOS. If the resources
assigned to the MultiModemZPX-PCI conflict with the resources of another device, the
resources of the second device have to be changed. Select the port the conflicting device
is on and change it to resolve the conflict. If you need to change switches or jumpers on t
he conflicting device, refer to the device’s documentation.
•If you have another MultiModemZPX-PCI, install it and try to make a connection.
•The modem might have a problem beyond the scope of this user guide. If you have an
other Multi-Tech modem, try swapping modems. If the problem goes away, call Techni
cal Support for assistance.
The Modem Cannot Connect When Dialing
Reasons why the MultiModemZPX-PCI may fail to connect 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
•poor line conditions.
You can narrow the list of possibilities by using extended result codes. Extended result codes are
enabled by default. If they have been disabled, include V1X4 in the modem’s initialization string, or in
terminal mode enter ATV1X4 and press ENTER. When you dial again, the modem reports the call’s
progress.
•If the modem reports NO DIALTONE, check that the modem’s telephone line cable is
connected to both the modem’s LINE jack (not the PHONE jack) and the telephone wall jack.
If the cable looks secure, try replacing it.
If that doesn’t work, the problem might be in your building’s telephone installation. To test
the building installation, plug a telephone into your modem’s telephone wall jack and listen
for a dial tone. If you hear a dial tone, your modem might be installed behind a corporate
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 with your PBX personnel or the PBX system manual to see if you can change
the internal dial tone. If you can’t, change your modem’s 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).
•If the modem reports BUSY, the other number might be busy. Try again later. BUSY can also
indicate that you 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 using legacy
software is to include it in the modem’s dial prefix, e.g., ATDT9,. Note the comma, which

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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.
•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 person 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 there is a modem at the other end. In that case, the
modems might be having problems negotiating because of incompatibilities or line noise.
Try the call again, connecting at a lower speed by setting register S37 to a lower rate (for
example, by typing ATS37=11 in the terminal window and pressing ENTER).
•Poor line conditions can also affect the connection. When using V.34 or V.32 client-to-client
connections in poor conditions, setting S38=0 may result in better performance.
The Modem Disconnects While Online
•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, disable it before each
call. In most telephone areas in North America, you can disable Call Waiting by preceding
the telephone number with *70 (but first check with your local telephone company).
You can automatically disable Call Waiting by including the disabling code in the modem’s
dial prefix (e.g., ATDT*70,—note the comma, which inserts a pause before the number is
dialed). For example, in Windows select Start | Settings | Control Panel, and then
Modems. In the Modems Properties dialog box, select Multi-Tech MT5634ZPX-PCI, and
then click Dialing Properties. Check This location has call waiting, and then 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 frequent problem,
disconnect the extension phones before using the modem, or install another phone line
especially for the modem.
•Check that the phone cord between the modem’s LINE jack and the wall jack is undamaged
and firmly connected to both.
•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.
•Your ISP might have hung up on you because of lack of activity on your part or because
you exceeded your time limit for the day. Try again.

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The Modem Cannot Connect When Answering
•Autoanswer might be disabled. Turn on autoanswer in your communications program or
send the command ATS0=1 (ATS0=2 if you have Caller ID service) to your modem in
terminal mode.
•The application should supply DTR. The default DTR Control command (&D2) inhibits
autoanswer. To enable autoanswer, change DTR Control to &D0, and make sure &Q0, &Q5,
or &Q6 is also set. For more information, see the &D command in the AT Commands
Reference Guide.
File Transfer Is Slower Than It Should Be
•If you are using a slow transfer protocol, such as Xmodem, try Zmodem or Ymodem/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.
•If you are downloading a compressed file with MNP 5 hardware compression enabled, try
disabling data compression. The transfer may be marginally slower with data compression
enabled, because hardware data compression cannot compress a file already compressed by
an archiving program.
•Does your Internet service provider (ISP) use the same 56K protocol as your modem? The
default setting of your modem is to connect using either the V.92 or the V.90 protocol,
depending on which one the ISP’s modem is using. If your ISP uses the V.90 protocol, the
maximum speed you will be able to upload at is 33,600 bps. Check with your ISP to see
which protocols it supports.
•Are you trying to send a file to another client modem? If so, then your maximum possible
connect speed is 33,600 bps. You can upload at speeds greater than 33,600 bps only when
connected to an ISP that supports the V.92 protocol.
•Try entering the I11 command in online mode or the &V command in command mode to
display information about the last connection, making a screen print of the connection
statistics, and checking for parameters that might be unacceptable.
Data Is Being Lost
•If you are using data compression, set the serial port baud rate to two to six times the data
rate.
•Make sure the flow control method you selected in your software matches the method
selected in the modem (see AT commands &K and \Q.)
•Enter the I11 command in online mode or the &V command in command mode to display
information about the last connection. Then make a screen print of the connection statistics,
and look for unacceptable parameters.