This manual covers 3Com U.S. Robotics® faxmodems. 3Com, the 3Com logo, U.S. Robotics, and Winmodem are registered trademarks and Connections, RapidComm, and x2 are trademarks of 3Com Corporation. Windows is a registered trademark of Microsoft Corp. CompuServe is a registered trademark of CompuServe Inc. America Online is a registered trademark of America Online Inc. Any other trademarks, trade names, or service marks used in this manual are the property of their respective owners.
TABLE OF CONTENTS 56K Faxmodem Product Features .....................................................................................1-1 Software Installation ...................................................................................................... 2-1 Speakerphone Features (External Voice Speakerphone Modems Only) ...................... 3-1 Internet Update Wizard.................................................................................................... 4-1 Uninstalling a U.S.
56K FAXMODEM PRODUCT FEATURES Modulation Schemes ITU-T V.90 x2™ technology ITU-T V.34+ ITU-T V.34 ITU-T V.32bis ITU-T V.32 ITU-T V.22bis ITU-T V.22 ITU-T V.23 Bell 212A ITU-T V.21 Bell 103 Error Control and Data Compression Schemes ITU-T V.42 ITU-T V.42bis MNP 2-5 Fax Modulation Schemes ITU-T V.17 ITU-T V.29 ITU-T V.27ter ITU-T V.21 Fax Standards EIA 578 Class 1 FAX EIA 592 Class 2.
SOFTWARE INSTALLATION Running the Setup Wizard The instructions for installing your Connections™ CD-ROM software are on the installation map included in your modem’s box. If you have not completed this portion of your install, you should do so now. Using Connections Software Once installation is complete, you can use the Connections CD at any time by following these steps: • Insert the Connections CD into your CD-ROM drive. • If the CD is already in your drive, take it out and reinsert it.
SPEAKERPHONE FEATURES (EXTERNAL VOICE SPEAKERPHONE MODEMS ONLY) Making a Speakerphone Call with a Telephone 1. Make sure your telephone is plugged into the modem’s PHONE jack. 2. Lift the telephone’s handset. 3. Dial the phone number. 4. When the person on the other end answers, press the SPEAKER button (on top of the modem). 5. Hang up the handset. 6. To end the call, press the SPEAKER button again. Making a Speakerphone Call with Communications Software 1.
SPEAKERPHONE FEATURES (EXTERNAL VOICE SPEAKERPHONE MODEMS ONLY) Muting a Call If you’d like to say something without the receiving party hearing you, you can press the MUTE button. When you mute a call, the ONLINE light will blink. To turn off the mute feature, press MUTE again. (The ONLINE light will stop blinking and remain illuminated for the remainder of the call.
INTERNET UPDATE WIZARD The Connections CD-ROM, which came with your modem, includes the 3Com Internet Update Wizard. This software is designed to quickly update your modem to the latest code. 8. When you see the screen below, the setup is complete. Click OK. NOTE: You can also obtain this software from our BBS (847-262-6000; log in as Modem Utility, and the setup file will be downloaded) or from our Web page (http://consumer.3com.com/support/index.html).
UNINSTALLING A U.S. ROBOTICS MODEM NOTE: These instructions only apply to current U.S. Robotics modems. If the modem you’ll be uninstalling was made by another manufacturer, refer to that modem’s documentation for uninstall instructions. To Uninstall • • • A Winmodem® Modem, see page 5-1. An Internal Faxmodem, see page 5-2. An External Faxmodem, see page 5-2. Uninstalling a Winmodem Modem 1. First, remove the Winmodem software from the Windows operating system.
UNINSTALLING A U.S. ROBOTICS MODEM CAUTION : To avoid the risk of electric shock, make sure your computer and all peripheral devices are turned off and unplugged. 13. Remove the computer’s cover. (If you do not know how, refer to your computer’s documentation.) 14. Find the modem inside the computer. (It will be the green board with TELCO (or ) and PHONE (or ) stamped on its metal bracket.) 15. Remove the screw that attaches the modem’s metal bracket to the computer. 16. Remove the modem from its slot. 17.
UNINSTALLING A U.S. ROBOTICS MODEM 4. Double-click the Modems icon. 5. Click to highlight the name of the modem you wish to remove. 6. Click the Remove button. 7. Remove the phone cords from the modem’s TELCO (or ) and PHONE (or ) jacks. 8. Shut down Windows. CAUTION : To avoid the risk of electric shock, make sure your computer and all peripheral devices are turned off and unplugged. 9. Unplug the modem’s power adapter from the outlet or power strip. 10. Unplug the modem’s serial cable from the computer.
TROUBLESHOOTING AND HELP RESOURCES External Modems ........................................................................................................ 6-3 Basic Troubleshooting Steps........................................................................................................... 6-3 My Computer Isn’t Recognizing my Modem.................................................................................. 6-4 My Software Isn’t Recognizing my Modem .................................................
TROUBLESHOOTING AND HELP RESOURCES Internal ISA Modems ................................................................................................ 6-28 Basic Troubleshooting Steps......................................................................................................... 6-28 My Computer Isn’t Recognizing my Modem................................................................................ 6-28 My Software Isn’t Recognizing my Modem .....................................................
TROUBLESHOOTING AND HELP RESOURCES EXTERNAL MODEMS Basic Troubleshooting Steps 1. Is your modem turned on? When your modem is properly connected to power and is turned on, the CS light on the front panel will be on. 2. Is your power supply connected properly to both your modem and an electrical outlet? If it is, check the outlet with another electric device (like a lamp) to be sure that you are getting power.
TROUBLESHOOTING AND HELP RESOURCES 4. If there are DIP switches on the back of your modem, are they set correctly? DIP switches 3, 5, and 8 should be in the down position. See the diagram below for the proper settings. 5. Is your phone cord properly connected? The phone cord should be plugged into the phone jack. Use the phone cord included in your modem's box if possible. jack on the modem and into the wall PROBLEM: My computer isn’t recognizing my modem.
TROUBLESHOOTING AND HELP RESOURCES Windows 95/98 Make sure your COM port is not already in use by another modem. Click Windows Start, Settings, and Control Panel, and then double-click Modems. Look for another modem already in the machine. If there is another modem installed, click the Diagnostics tab to find out which COM port it is using. If a previous modem is already using the available COM port, you can either use another COM port or uninstall the previously installed modem.
TROUBLESHOOTING AND HELP RESOURCES Possible solution: Make sure the modem is plugged in and turned on. If it is, check the outlet with another electric device (like a lamp) to be sure that you are getting power. Also, you must use the power supply that came with your modem; other similar-looking power supplies may be of different voltages and could damage your modem. When your modem is properly connected to power and is turned on, the CS light on the front panel will be on.
TROUBLESHOOTING AND HELP RESOURCES Possible solution: You might have a bad phone cord connection to your modem, or your phone cord may be plugged into the wrong jack. The phone cord should be plugged into the jack on the modem and into the wall phone jack. Use the phone cord included in your modem's box if possible. Possible solution: You may have devices between the modem and the phone jack. There should be no line splitters, fax machines, or other devices between the modem and the wall jack.
TROUBLESHOOTING AND HELP RESOURCES Windows 98 Windows NT Possible solution: Make sure the DIP switches on the back of your modem are set correctly. DIP switches 3, 5, and 8 should be in the down position. See the diagram below for the proper settings.
TROUBLESHOOTING AND HELP RESOURCES PROBLEM: My modem isn’t achieving a 56K Internet connection. Note: Due to current FCC regulations, maximum download speed is limited to 53,333 bps. Our research has shown that the vast majority of telephone lines in North America can and do support 56K connections. The V.90 protocol allows for connection speeds of up to 56K, but line conditions may affect the actual speeds during a given connection.
TROUBLESHOOTING AND HELP RESOURCES EXTERNAL USB MODEMS Basic Troubleshooting Steps 1. Is your modem turned on? When your modem is properly connected to power and is turned on, the Power light on the front panel will be on. 2. Is your power supply connected properly to both your modem and an electrical outlet? If it is, check the outlet with another electric device (like a lamp) to be sure that you are getting power.
TROUBLESHOOTING AND HELP RESOURCES USB A to B cable NOTE: You should NOT attempt to connect or use your modem with both the USB and serial cable connected at the same time. Your modem may fail to respond. If this occurs, you must power down your computer, disconnect the cable you are not using, and restart your system. 4. Is your phone cord properly connected? The phone cord should be plugged into the jack. Use the phone cord included in your modem’s box if possible.
TROUBLESHOOTING AND HELP RESOURCES IF YOU ARE USING THIS MODEM AS A USB DEVICE: Possible solution: Your USB port may not be enabled. To ensure USB is enabled on your system. Click Windows Start. Then click Settings, and then Control Panel. Click the System icon. Next click the Device Manager tab. If your USB is enabled, there will be a USB icon (+ Universal serial bus controller) under Computer. See the picture below for an example of how the USB icon appears in Device Manager.
TROUBLESHOOTING AND HELP RESOURCES Possible solution: If the modem has worked previously and you removed the USB cable from the computer and then reattached it, try another USB port. It may have been set up originally on the other USB port. You should notice some minimal activity from your computer such as hard disk activity or an hour glass icon for a few seconds when you insert or remove a USB cable from the computer or the USB device.
TROUBLESHOOTING AND HELP RESOURCES PROBLEM: My software isn’t recognizing my modem. Possible solution: Your communications software may not function properly if you have more than one version of the software installed, you are using an older version, or you have more than one communications software installed on your system. We highly recommend using the communications software provided with your modem on the Connections CD-ROM.
TROUBLESHOOTING AND HELP RESOURCES select Properties. Make sure that the description in the modem box matches the description of the modem you are using. If it doesn’t match, select the proper modem description. FOR BOTH DIALING AND ANSWERING PROBLEMS: Possible solution: Make sure that you are using the power supply that came with your modem; other similar-looking power supplies may be of different voltages and could damage your modem.
TROUBLESHOOTING AND HELP RESOURCES Possible solution: You may have a poor connection. All calls are routed differently, so try placing the call again. You may see one of the following error messages.
TROUBLESHOOTING AND HELP RESOURCES PROBLEM: My modem isn’t achieving a 56K Internet connection. Note: Due to current FCC regulations, maximum download speed is limited to 53,333 bps. Our research has shown that the vast majority of telephone lines in North America can and do support 56K connections. The V.90 protocol allows for connection speeds of up to 56K, but line conditions may affect the actual speeds during a given connection.
TROUBLESHOOTING AND HELP RESOURCES Macintosh Modems Basic Troubleshooting Steps 1. Is your modem turned on? When your modem is properly connected to power and is turned on, the TR and CS lights on the front panel will be on. 2. Is your power supply connected properly to both your modem and an electrical outlet? You must use the power supply that came with your modem; other similar-looking power supplies may be of different voltages and could damage your modem.
TROUBLESHOOTING AND HELP RESOURCES PROBLEM: My computer isn’t recognizing my modem. Possible solution: Make sure the modem is plugged in and turned on. Also, you must use the power supply that came with your modem; other similarlooking power supplies may be of different voltages and could damage your modem. When your modem is properly connected to power and is turned on, the TR and CS lights on the front panel will be on.
TROUBLESHOOTING AND HELP RESOURCES PROBLEM: My modem won't dial out or doesn't answer incoming calls. FOR BOTH DIALING AND ANSWERING PROBLEMS: Possible solution: Make sure that you are using the power supply that came with your modem; other similar-looking power supplies may be of different voltages and could damage your modem. Possible solution: You might have a bad phone cord connection to your modem, or your phone cord may be plugged into the wrong jack.
TROUBLESHOOTING AND HELP RESOURCES DIALING PROBLEMS FOR VOICE MAIL USERS: Possible solution: If you have voice mail provided by your local phone company, your dial tone may be altered when messages are waiting. Retrieve your voice mail to restore your normal dial tone. PROBLEM: My modem sounds like it’s trying to connect to another modem, but fails. Possible solution: You may have a poor connection. All calls are routed differently, so try placing the call again.
TROUBLESHOOTING AND HELP RESOURCES • The server you’re dialing in to must support and provide a digital V.90 signal. Your ISP can provide you with a list of dial-up connections and information on what those connections currently support. • The telephone line between your ISP and your modem must be capable of supporting a 56K connection and contain only one analog-to-digital conversion. The 56K signal from your ISP begins as a digital signal.
TROUBLESHOOTING AND HELP RESOURCES INTERNAL WINMODEM MODEMS Basic Troubleshooting Steps 1. Make sure that your phone cord is properly connected. Remove the phone cord from the modem and wall jacks. Clean any dirt or corrosion from the cord and jacks. Reinsert the cord securely in the wall jack and the modem’s jack. Use the phone cord included with your modem, if possible. 2. Make sure that your internal modem is physically installed correctly in your computer.
TROUBLESHOOTING AND HELP RESOURCES your modem, double-click the Computer icon. The “Computer Properties” screen will appear. When it does, click the View Resources tab, then click Interrupt request (IRQ) to make sure that it is selected. On the left side of the “Computer Properties” screen is a list of the system IRQs, numbered 0 through 15. On the right side are the devices that are using these IRQs. Any IRQ numbers not listed on the left side are going unused.
TROUBLESHOOTING AND HELP RESOURCES Possible solution: You may not have the correct modem type selected in your software or in Windows. Click on Windows Start, Settings, and Control Panel. When Control Panel opens, click Modems. Here you will see a list of installed modems. You can also add, remove, or view the properties of modems from this window. The 3Com U.S. Robotics modem you have installed should be present in the list of installed modems.
TROUBLESHOOTING AND HELP RESOURCES Possible solution: If you have voice mail provided by your local phone company, your dial tone may be altered when messages are waiting. Retrieve your voice mail to restore your normal dial tone. PROBLEM: My modem sounds like it’s trying to connect to another modem but fails. Possible solution: You may have a poor connection. All calls are routed differently, so try placing the call again. You may see one of the following error messages.
TROUBLESHOOTING AND HELP RESOURCES Windows NT PROBLEM: My modem isn’t achieving a 56K Internet connection. Note: Due to current FCC regulations, maximum download speed is limited to 53,333 bps. Our research has shown that the vast majority of telephone lines in North America can and do support 56K connections. The V.90 protocol allows for connection speeds of up to 56K, but line conditions may affect the actual speeds during a given connection.
TROUBLESHOOTING AND HELP RESOURCES INTERNAL ISA MODEMS Basic Troubleshooting Steps 1. Make sure that your phone cord is properly connected. Remove the phone cord from the modem and wall jacks. Clean any dirt or jack. Use the phone cord included corrosion from the cord and jacks. Reinsert the cord securely in the wall jack and the modem’s with your modem, if possible. 2. Make sure that your internal modem is physically installed correctly in your computer.
TROUBLESHOOTING AND HELP RESOURCES Locate your modem in the list of devices. If a yellow exclamation point appears over the modem’s description, your modem is in conflict with another device. Either your modem or the other device will have to be reinstalled to another IRQ in order to resolve your conflict. If a usable, free IRQ does not exist, you may need to remove, disable, or relocate another device. Refer to that device’s documentation for more information about removing, disabling, or relocating it.
TROUBLESHOOTING AND HELP RESOURCES Windows NT Turn off your computer and remove your modem. Restart and click Windows Start, Settings, and then Control Panel. Doubleclick the Ports icon. Your modem must be jumpered to a COM port setting that does not appear in this list. PROBLEM: My software isn’t recognizing my modem.
TROUBLESHOOTING AND HELP RESOURCES Possible solution: If you are using Dial-Up Networking, it may not be configured correctly. Check your configuration and make sure you have the correct modem selected. Double-click My Computer, double-click Dial-Up Networking, right-click the connection you are trying to use, and click Properties. Make sure that the description in the modem box matches the description of the modem you are using. If it doesn’t match, select the proper modem description.
TROUBLESHOOTING AND HELP RESOURCES VOICE MAIL USERS: Possible solution: If you have voice mail provided by your local phone company, your dial tone may be altered when messages are waiting. Retrieve your voice mail to restore your normal dial tone. PROBLEM: My modem sounds like it’s trying to connect to another modem but fails. Possible solution: You may have a poor connection. All calls are routed differently, so try placing the call again. You may see one of the following error messages.
TROUBLESHOOTING AND HELP RESOURCES PROBLEM: My modem isn’t achieving a 56K Internet connection. Note: Due to current FCC regulations, maximum download speed is limited to 53,333 bps. Our research has shown that the vast majority of telephone lines in North America can and do support 56K connections. The V.90 protocol allows for connection speeds of up to 56K, but line conditions may affect the actual speeds during a given connection.
TROUBLESHOOTING AND HELP RESOURCES Internal PCI Modems Basic Troubleshooting Steps 1. Make sure that your phone cord is properly connected. Remove the phone cord from the modem and wall jacks. Clean any dirt or corrosion from the cord and jacks. Reinsert the cord securely in the wall jack and the modem’s jack. Use the phone cord included with your modem, if possible. 2. Make sure that your internal modem is physically installed correctly in your computer.
TROUBLESHOOTING AND HELP RESOURCES If a usable, free IRQ does not exist, you may need to remove, disable, or relocate another device. Refer to that device’s documentation for more information about removing, disabling, or relocating it. If Windows still fails to recognize your modem and it does not have a yellow exclamation point next to its IRQ, or if your modem doesn’t appear in the list, another problem exists, and you may need to call 3Com Technical Support.
TROUBLESHOOTING AND HELP RESOURCES Windows NT Turn off your computer and remove your modem. Restart and click Windows Start, Settings, and then Control Panel. Doubleclick the Ports icon. Your modem must be set to a COM port setting that does not appear in this list. PROBLEM: My software isn’t recognizing my modem.
TROUBLESHOOTING AND HELP RESOURCES FOR BOTH DIALING AND ANSWERING PROBLEMS: Possible solution: You may have a bad phone cord connection to your modem, or your phone cord may be plugged into the wrong jack. The phone cord should be plugged into the jack on the modem and into the wall phone jack. Use the phone cord included in your modem’s box if possible. Possible solution: You may have devices between the modem and the phone jack.
TROUBLESHOOTING AND HELP RESOURCES PROBLEM: My modem sounds like it’s trying to connect to another modem but fails. Possible solution: You may have a poor connection. All calls are routed differently, so try placing the call again. PROBLEM: My modem isn’t achieving a 56K Internet connection. Note: Due to current FCC regulations, maximum download speed is limited to 53,333 bps. Our research has shown that the vast majority of telephone lines in North America can and do support 56K connections. The V.
TROUBLESHOOTING AND HELP RESOURCES Help Resources Are You Still Having Problems? World Wide Web Review this manual. Contains useful product information, documents, and manuals. Log on to: Call or visit your modem dealer. They may be able to provide immediate assistance. http://consumer.3com.com/support/index.html If your dealer can't help you, contact 3Com Customer Support.
TROUBLESHOOTING AND HELP RESOURCES If You Need to Return the Modem to 3Com for Repair NOTE: If you can, have your ati7 information written down on a piece of paper before you call tech support. Regular Phone Service Contact 3Com Customer Support. If the support representative determines that you need to return the modem for repair, you will receive a USO (User Service Order) number. You must have a USO number before returning the modem to us.
GLOSSARY Cross references are printed in boldface. analog loopback A modem self-test in which data from the keyboard or an internal test pattern is sent to the modem's transmitter, turned into analog form, looped back to the receiver, and converted back into digital form. auto-dial A process where your modem dials a call for you. The dialing process is initiated by sending an ATDT (dial tone) or ATDP (dial pulse) command followed by the telephone number. Auto-dial is used to dial voice numbers.
GLOSSARY up modems that establish and control the data link via the telephone network. character A representation, coded in binary digits, of a letter, number, or other symbol. characters per second (cps) A data transfer rate generally estimated from the bit rate and the character length. For example, at 2400 bps, 8-bit characters with start/stop bits (for a total of ten bits per character) will be transmitted at a rate of approximately 240 characters per second (cps).
GLOSSARY default Any setting assumed, at startup or reset, by the computer's software and attached devices. The computer or software will use these settings until changed by the user or other software. detect phase In the ITU-T V.42 error-control protocol, the first stage in establishing if both modems attempting to connect have V.42 capability. digital loopback A test that checks the modem's RS-232 interface and the cable that connects the terminal or computer and the modem.
GLOSSARY facsimile A method for transmitting the image on a page from one point to another. Commonly referred to as fax. fax mode The mode used by a modem to send and receive data in facsimile format. See definitions for V.17, V.27ter, V.29. flow control A mechanism that compensates for differences in the flow of data into and out of a modem or other device. See commands &Hn, &In, &Rn. frame A data communications term for a block of data with header and trailer information attached.
GLOSSARY online fall back/fall forward A feature that allows high-speed, error-control modems to monitor line quality and fall back to the next lower speed in a defined range if line quality diminishes. As line conditions improve, the modems switch up to the next higher speed. originate mode The mode used by your modem when initiating an outgoing call to a destination modem. The transmit/receive frequencies are the reverse of the called modem, which is in answer mode.
GLOSSARY V.90 V.22 bis The ITU-T standard for 56 Kbps modem communications. This An ITU-T standard for modem communications at 2400 bps. The standard technology includes an automatic link negotiation fallback to 1200 bps and compatibility with Bell 212A/V.22 modems. V.27 ter An ITU-T standard for facsimile operations that specifies modulation at 4800 bps, with fallback to 2400 bps. V.29 An ITU-T standard for facsimile operations that specifies modulation at 9600 bps, with fallback to 7200 bps. V.
GLOSSARY ability to recover from a partially complete transfer, an autostart feature, uses the digital telephone network to increase the bit rate of the receive and improved efficiency. channel by eliminating the analog to digital conversion commonly found in modem connections. V.90 connections require a modem with V.90 or x2 technology calling a digitally connected Internet Service Provider or corporate host site compatible with V.90 or x2 technology.
TECHNICAL REFERENCE Front-of-the-Case Lights (External Faxmodems) ..................................................8-2 Top-of-the-Case Lights (Voice Faxmodem Pro Externals) ....................................8-2 Typing Commands ....................................................................................................8-3 Basic Data Commands..............................................................................................8-4 Extended Data Commands ......................................
TECHNICAL REFERENCE Front-of-the-Case Lights (External Symbol Meaning Faxmodems) Status AA...........Auto Answer Answer mode: ON when register S0 is set to 1 or higher (Auto Answer), and when answering a call; OFF when modem originates a call. Light flashes when there is an incoming call. CD ...........Carrier Detect ON if modem receives a valid data signal (carrier) from a remote modem, indicating that data transmission is possible. Always ON if CD override is ON (&C0). RD ...........
TECHNICAL REFERENCE Typing Commands • Type commands in either upper or lower case, not a combination. Use the Backspace key to delete errors. (You cannot delete the original AT command since it is stored in the modem buffer.) • If a command has numeric options and you don’t include a number, zero is assumed. For example, if you type ATB, the command ATB0 is assumed. • Every command except A/, +++, and A> must begin with the AT prefix and be entered by pressing ENTER.
TECHNICAL REFERENCE Basic Data Commands S Stop or restart help screens. C or K Stop help screens. $ Use in conjunction with D, S, or & commands (or just AT) to display a basic command list; online help. A Manual Answer: Goes off hook in answer mode. Pressing any key aborts the operations. A/ Re-executes the last issued command. Used mainly to re-dial. Does not require the AT prefix or a Carriage Return.
TECHNICAL REFERENCE Basic Data Commands En Sets local echo. E0 Echo OFF E1 Modem displays keyboard commands Fn Sets online local echo of transmitted data ON/OFF. F0 Local echo ON. Modem sends a copy of the data it sends to the remote system to your screen. F1 Local echo OFF. Receiving system may send a remote echo of data it receives. Hn In Controls ON/OFF hook. H0 Hangs up (goes on hook). H1 Goes off hook. Displays the following information.
TECHNICAL REFERENCE Basic Data Commands Vn Displays verbal/numeric result codes. V0 Numeric codes V1 Verbal codes Xn Sets result code displayed. Default is X4. Result Codes NOTE: Result codes 0 - 155 are for 33.6 products and V.90 products. Result codes above 155 apply only to V.90.
TECHNICAL REFERENCE Basic Data Commands Yn Selects power-on/reset default configuration. Y0 Use profile 0 setting in NVRAM Y1 Use profile 1 setting in NVRAM Y2 Use factory configuration 0. Y3 Use factory configuration 1. Y4 Use factory configuration 2 Z Resets modem. Z0 Resets modem to NVRAM profile selected by Y command or dip 7.
TECHNICAL REFERENCE Extended Data Commands &$ Displays a list of ampersand (&) commands. &An Enables/disables added result code subsets (see Xn). &A0 ARQ result codes disabled &A1 ARQ result codes enabled &A2 V.32 modulation indicator added &A3 Protocol indicators addedLAPM/MNP/NONE (error control) and V42bis/MNP5 (data compression) &Bn Manages modem’s serial port rate.
TECHNICAL REFERENCE Extended Data Commands &M3 &M4 &M5 &Nn &N18 &N19 &N20 &N21 &N22 &N23 &N24 &N25 &N26 &N27 &N28 &N29 &N30 &N31 &N32 &N33 &N34 &N35 &N36 &N37 &N38 &N39 Reserved Normal/ARQ ARQ mode Sets connect speed. If connection cannot be made at this speed, the modem will hang up. Note: When used in conjunction with &Un and &Un is greater than 0, &Nn sets the ceiling connect speed. &Un sets the floor connect speed (see also the table in the &Un section).
TECHNICAL REFERENCE Extended Data Commands &Rn Sets Receive Data (RD) hardware flow control, Request to Send (RTS) (see also &Hn). &R0 Reserved &R1 Modem ignores RTS &R2 Received Data to computer only on RTS &Sn Controls Data Set Ready (DSR) operations. &S0 DSR override; always ON &S1 Modem controls DSR &Tn Begins test modes.
TECHNICAL REFERENCE Extended Data Commands Note: &U17 through &U39 apply only to V.90 products.
TECHNICAL REFERENCE DIP Switches (External Modems with DIP Switches Only) Note: If a DIP switch is on, it is down. If a DIP switch is off, it is up. Defaults are in italics.
TECHNICAL REFERENCE S Registers Note: To change a setting use ATSr=n, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default Function S0 0 Sets number of rings on which to answer in Auto Answer mode. When set to 0, Auto Answer is disabled. S1 0 Counts and stores number of rings from an incoming call. (S0 must be greater than 0.) S2 43 Stores ASCII decimal code for the escape code character. Default character is +.
TECHNICAL REFERENCE S Registers Note: To change a setting use ATSr=n, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default S13 0 Function Bit-mapped register. Select the bit(s) you want on and set S13 to the total of the values in the Value column. For example, ATS13 = 17 enables bit 0 (value is 1) and bit 4 (value is 16). Bit Value Result 0 1 Reset when DTR drops. 1 2 Reset non-MNP transmit buffer from 1.5K to 128 bytes.
TECHNICAL REFERENCE S Registers Note: To change a setting use ATSr=n, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default Note: Function To disable V.
TECHNICAL REFERENCE S Registers Note: To change a setting use ATSr=n, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default Function S16 0 Reserved S17 0 Reserved S18 0 Test timer for &T loopback testing. Sets the time in seconds of testing before the modem automatically times out and terminates the test. When set to 0, the timer is disabled. Valid range is 1-255. S19 0 Sets duration, in minutes, for inactivity timer.
TECHNICAL REFERENCE S Registers Note: To change a setting use ATSr=n, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default Function S27 0 Bit-mapped register setup. To set the register, see instructions for S13. Bit Value Result 0 1 Enables ITU-T V.21 modulation at 300 bps for overseas calls; in V.21 mode, the modem answers both overseas and domestic (U.S. and Canada) calls, but only originates V.21 calls (default Bell 103).
TECHNICAL REFERENCE S Registers Note: To change a setting use ATSr=n, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default Function S32 2 Bit-mapped register setup. To set the register, see the instructions for S13. Bit Value Result 0 1 V.8 Call Indicate enabled. 1 2 Enables V.8 mode. 2 4 Reserved. 3 8 Disable V.34 modulation. 4 16 Disable V.34+ modulation. 5 32 Disable x2 modulation. 6 64 Disable V.90 modulation.
TECHNICAL REFERENCE S Registers Note: To change a setting use ATSr=n, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default S34 0 Function Bit-mapped register setup. To set registers, see instructions for S13. Bit 0 1 2 3 4 5 6 7 S35-S37 Value 1 2 4 8 16 32 64 128 Result Disable 8S-2D trellis encoding. Disable 16S-4D trellis encoding. Disable 32S-2D trellis encoding. Disable 64S-4D trellis encoding. Disable non-linear coding.
TECHNICAL REFERENCE S Registers Note: To change a setting use ATSr=n, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default Function S41 0 Bit-mapped register setup. To set registers, see instructions for S13. Bit Value Result 0 1 Distinctive ring enabled. 1 2 Speakerphone connect message override (voice products only). 2 4 Disable Digital Line Guard (56K internal faxmodems only). 3 8 Message waiting (voice products only). 4 16 Reserved.
TECHNICAL REFERENCE Fax Commands +FCLASS=n Sets the mode of operation. FCLASS=0 Data mode FCLASS=1 Group 3 Facsimile Service Class 1 mode FCLASS=2.0 Group 3 Facsimile Service Class 2.0 mode FCLASS? Displays the current FCLASS mode (see descriptions above). +FCLASS=? Displays the FCLASS mode options (see descriptions above). +FTS=n +FRS=n Stops the fax transmission. Then the modem waits for a specified time before OK appears on screen. The pause is set in 10 millisecond intervals.
TECHNICAL REFERENCE Screen Messages Screen Messages Numeric Message Text Message Description 0 OK The previous command has been processed successfully. 1 CONNECT The modem has just connected to another modem. 2 RING Reports the receipt of a network altering ring. 3 NO CARRIER No carrier is being received from the modem. 4 ERROR The previous command line has not been recognized or was completed abnormally.
TECHNICAL REFERENCE The Serial Interface The serial interface is a standard developed by the Electronic Industries Association (EIA). It defines the signals and voltages used when data is exchanged between a computer and a modem or serial printer. The entire standard covers many more functions than are used in most data communications applications.
REGULATORY INFORMATION AND LIMITED WARRANTY Notice: This modem was not designed or approved for use in Europe, Australia, or New Zealand. Manufacturer’s Declaration of Conformity 3Com Corporation 3800 Golf Road Rolling Meadows, IL 60008 U.S.A.
REGULATORY INFORMATION AND LIMITED WARRANTY have installation instructions detailing user installation of card accessories. not installed and used in accordance with the instructions, may cause interference to radio and television communications. Fax Branding However, there is no guarantee that interference will not occur in a particular installation.
REGULATORY INFORMATION AND LIMITED WARRANTY For Canadian Modem Users Industry Canada (IC) This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus set out in the interference-causing equipment standard entitled Digital Apparatus, ICES-003 of Industry Canada. NOTICE: The Ringer Equivalence Number (REN) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface.
REGULATORY INFORMATION AND LIMITED WARRANTY ou de modifications effectuées par l'utilisateur ou à cause de mauvais fonctionnement.
REGULATORY INFORMATION AND LIMITED WARRANTY OBTAINING WARRANTY SERVICE: Customer must contact a 3Com Corporate Service Center or an Authorized 3Com Service Center within the applicable warranty period to obtain warranty service authorization. Dated proof of purchase from 3Com or its authorized reseller may be required.
REGULATORY INFORMATION AND LIMITED WARRANTY RANGE OF THE INTENDED USE, OR BY ACCIDENT, FIRE, LIGHTNING, OTHER HAZARDS, OR ACTS OF GOD.