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Last Updated December 10, 2003

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Modems
(56k Voice/Data/Fax, ISDN, DSL, Cable Modems, etc.,)

Now that the 56k speed limit has been shattered with DSL technology and Cable modems are becoming widely available, the face of the internet and home networking is changing. Keeping up on the technology, and watching the cable and phone companies battle for bandwidth should be interesting over the next few years.

Resource Sites
Ask Mr. Modem 5.0
Easy to use database for finding initialization strings for a variety if modem manufacturers.

Cable-Modems.org
Cable Modem Reference Guide. All you want to know about cable modem technology, how they work, what's inside, the standards, business etc. More than just a FAQ!

CableModemHelp.com
A resource for users of cable modems. Emphasizing cable modem security and privacy issues. Good collections of tips and instructions to speed up your connection and diagnose problems.

Cable Modem Resources on the Web
Comprehensive list compiled by David Gingold at MIT.

CATV CyberLab -catv.org
Provides the Internet community and telecommunications industry with free, easily accessible, in-depth market intelligence and news centered around the cable industry and technologies that can be run over hybrid fiber/coax networks.

Curt's High Speed Modem FAQ
If you access the Internet using a dial-in Modem on a Windows PC, then this page is for you! Comprehensive Modem FAQ, news, tips and tricks. 

Everything You Ever Wanted To Know About Modems
The Internet's original source of modem technical information. A combination of resources collected over 5 years by a tech working for an Internet Service Provider.

IINET Modem Troubleshooting Page
An excellent resource from Australia.

FCC ID Search
Use this database if you're not sure who made your modem.

ModemHelp.com
Comprehensive resource portal. Covers 56k, ISDN, Cable modems, manufacturers, and more.

Navas Cable Modem/DSL Tuning Guide
Huge and excellent resource page covering Cable modem and DSL tips on increasing speed, enhancing security, fixing problems, sharing a connection, and more.

Where to Start...
Cable Modem 101
Large archive of cable modem FAQ's and online tutorials

Cable Modems - Glossary of Terms
Well done index of industry terms and definitions.

Cable Modem Tutorial
Courtesy of Cable-Modems.org

HOW TO: Install or Remove Modems in Windows 2000 
Microsoft Knowledge Base Article: 301948 - This step-by-step article describes how to install or remove modems on Windows 2000.(updated 7/20/2001) 

Introduction to Modems
From the University of Chicago Computer Store. A bit dated, but still covers 56k, cable modems, and ISDN. (Last updated June 1997)

ISDN Tutorial
The place to start if you're considering an ISDN line.

Sharing a Cable Modem on your LAN
Well done tutorial on sharing a cable modem on Win9x home networks. Lots of useful information for beginners.

Modem Sharing
These pages describe how to share a single internet connection among multiple computers.  Connection via dial-up modem and cable modems are described.

Articles and other resources..

AT Command Reference Summary
A full list of the modem commands. Source: Modems.com

Checking Line Quality
A step by step guide on how to check your telephone line quality for high speed connections

Extended AT Command Sets
A very useful reference, includes modem commands, dial command modifiers, serial port control, and more.

Extra Initialization String for Modems Is Limited to 40 Characters 
Microsoft Knowledge Base Article: 311941 - When you try to configure an extra initialization string for a modem, you may be unable to add a string that is longer than 40 characters. (updated 182002) 

Fax Standards and Protocols
An overview of Fax machine classifications and corresponding fax modem classes.

List of all Modem manufacturers
Complete list and links to over 140 modem manufacturers. Source: modems.rosenet.net

All about UART's
Helpful guide to Universal Asynchronous Receiver/Transmitters, which are large scale integrated circuit that contain all the software programming necessary to fully control the serial port of a PC. Source: 3COM

Installing an ISA Bus Modem in an EISA Bus Slot
t
Source: 3COM

Serial Cable Pinouts
Source: 3COM


Known Issues and Bugs:

Cannot Use U.S. Robotics 56K Voice Faxmodem USB in Windows 2000
Microsoft Knowledge Base Article: 257738 - Windows 2000 may not be able to locate drivers for a U.S. Robotics 56K Voice Faxmodem USB that is connected to a Universal Serial Bus (USB) port, even though drivers for this modem are included with Windows 2000. (updated 8/10/2000)

Modem Not Detected in Windows 2000
Microsoft Knowledge Base Article: 199184 - Your keyboard or other devices may stop working, and you may experience other unexpected results such as loss of display color depth and resolution. A Plug and Play modem is not automatically detected. When you try to install the modem manually, Setup gets stuck in an endless loop and the Hardware Installation Wizard becomes unresponsive. Debugger output continuously prints: "PNP_EnumerateSubKeys caused an exception (1717)." The only way to stop this is to reboot. (updated 962000)

Modem Powers Off When It Is Not in Use
Microsoft Knowledge Base Article: 275042 - If you have a secure PC Card modem or a similar device that requires you to type a password before it is enabled and you connect to the modem when you start your computer (for example, by using HyperTerminal), modem, the modem is automatically powered off by Windows. When this occurs, Windows does not retain your password and you must retype it to enable the modem again. (updated 272001)

OEM Preinstallation with a Driver-Based Modem Uses Incorrect Path to the Modem.sys File
Microsoft Knowledge Base Article: 252667 - While in the GUI-mode phase of Setup, you may receive an error message that prompts you to provide the location of the Modem.sys file. (updated 8/29/2000)

Problems Using Plug and Play Modem with Windows 2000 on Compaq Prosignia 200 or 720 
Microsoft Knowledge Base Article: 280365 - After you install Windows 2000 on a Compaq Prosignia 200 or 720 computer with a Plug and Play ISA modem, a COM port may appear in Device Manager with a yellow exclamation point with a "Device failure" (code 10) status. For example, this may (updated 1262000)

PCTel V.90 K56 Hex HSP PNP Modem Does Not Work After Installing Windows 2000
Microsoft Knowledge Base Article: 228012 - After you install Windows 2000, your PCTel V.90 K56 Hex HSP PNP modem may not function. The modem appears as an unknown device in Device Manager. (updated 962000)

Standby or Hibernation Mode Disconnects ISDN, Modem and VPN Connections
Microsoft Knowledge Base Article: 227618 - When you manually put a computer running Windows 2000 into a Standby or Hibernation mode, any ISDN, modem, or VPN connection is disconnected. (updated 962000)

Using Virtual COM Port Dials Modem as Pulse Only
Microsoft Knowledge Base Article: 263643 - When you connect to a modem pool by using the Modem Sharing service from a Windows 2000-based computer, the modem may not respond or may respond incorrectly by not dialing, dialing only in pulse mode, or without using other initialization strings (updated 10/25/2000) 

Xircom CreditCard Ethernet+Modem 28.8 and 33.6 May Hang with Heavy Use 
Microsoft Knowledge Base Article: 246997 - When you use a Xircom CreditCard Ethernet+Modem 28.8 adapter or a Xircom CreditCard Ethernet+Modem 33.6 adapter on a portable computer running Microsoft Windows 2000 Professional, the adapter may stop responding (hang) under heavy use. (updated 12/29/1999)

Known Bugs and Issues

Cannot Use U.S. Robotics 56K Voice Faxmodem USB in Windows 2000
Microsoft Knowledge Base Article: 257738 - Windows 2000 may not be able to locate drivers for a U.S. Robotics 56K Voice Faxmodem USB that is connected to a Universal Serial Bus (USB) port, even though drivers for this modem are included with Windows 2000. (updated 8/10/2000)

External Modem Not Available If It Is Not Present During Startup
Microsoft Knowledge Base Article: 238317 - If your external modem is not present during Windows 2000 startup (for example, the modem is turned off), you may not be able to use the modem in Windows 2000 after you turn it on or reconnect it. Windows reports that the device is working correctly, but when you try to use it you may receive an error message stating that the device is not present. (updated 7/26/2001) 

Incorrect Modem Connection Speed Is Displayed
Microsoft Knowledge Base Article: 227695 - Modem connection speeds may be incorrectly displayed in Dial-Up Networking. Values that exceed the maximum speed of the modem may be displayed. Commonly reported values are 115,200 and 57,600.(updated 7/25/2001) 

Modems Do Not Answer as RAS Server
Microsoft Knowledge Base Article: 157827 - The Remote Access Service (RAS) server starts and a client rings, but the modem attached to the server does not pick up. (updated 7/25/2001) 

Modem Not Detected in Windows 2000
Microsoft Knowledge Base Article: 199184 - Your keyboard or other devices may stop working, and you may experience other unexpected results such as loss of display color depth and resolution. A Plug and Play modem is not automatically detected. When you try to install the modem manually, Setup gets stuck in an endless loop and the Hardware Installation Wizard becomes unresponsive. Debugger output continuously prints: "PNP_EnumerateSubKeys caused an exception (1717)." The only way to stop this is to reboot. (updated 962000)

Modem Powers Off When It Is Not in Use
Microsoft Knowledge Base Article: 275042 - If you have a secure PC Card modem or a similar device that requires you to type a password before it is enabled and you connect to the modem when you start your computer (for example, by using HyperTerminal), modem, the modem is automatically powered off by Windows. When this occurs, Windows does not retain your password and you must retype it to enable the modem again. (updated 272001)

OEM Preinstallation with a Driver-Based Modem Uses Incorrect Path to the Modem.sys File
Microsoft Knowledge Base Article: 252667 - While in the GUI-mode phase of Setup, you may receive an error message that prompts you to provide the location of the Modem.sys file. (updated 8/29/2000)

Problems Using Plug and Play Modem with Windows 2000 on Compaq Prosignia 200 or 720 
Microsoft Knowledge Base Article: 280365 - After you install Windows 2000 on a Compaq Prosignia 200 or 720 computer with a Plug and Play ISA modem, a COM port may appear in Device Manager with a yellow exclamation point with a "Device failure" (code 10) status. (updated 1262000)

PCTel V.90 K56 Hex HSP PNP Modem Does Not Work After Installing Windows 2000
Microsoft Knowledge Base Article: 228012 - After you install Windows 2000, your PCTel V.90 K56 Hex HSP PNP modem may not function. The modem appears as an unknown device in Device Manager. (updated 962000)

Standby or Hibernation Mode Disconnects ISDN, Modem and VPN Connections
Microsoft Knowledge Base Article: 227618 - When you manually put a computer running Windows 2000 into a Standby or Hibernation mode, any ISDN, modem, or VPN connection is disconnected. (updated 962000)

Using Virtual COM Port Dials Modem as Pulse Only
Microsoft Knowledge Base Article: 263643 - When you connect to a modem pool by using the Modem Sharing service from a Windows 2000-based computer, the modem may not respond or may respond incorrectly by not dialing, dialing only in pulse mode, or without using other initialization strings (updated 10/25/2000) 

U.S. Robotics Courier V.Everything External Plug and Play Modem Not Detected After Restart
Microsoft Knowledge Base Article: 253908 - After you restart your server, demand-dial interfaces or dial-up connections that use a U.S. Robotics Courier V.Everything External Plug and Play modem may not dial. Demand-dial interfaces show a connection state of "unreachable." (updated 7/25/2001) 

Xircom CreditCard Ethernet+Modem 28.8 and 33.6 May Hang with Heavy Use 
Microsoft Knowledge Base Article: 246997 - When you use a Xircom CreditCard Ethernet+Modem 28.8 adapter or a Xircom CreditCard Ethernet+Modem 33.6 adapter on a portable computer running Microsoft Windows 2000 Professional, the adapter may stop responding (hang) under heavy use. (updated 12/29/1999)

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