This manual covers 3Com U.S. Robotics® faxmodems. 3Com, the 3Com logo, U.S. Robotics, and Winmodem are registered trademarks and Connections, RapidComm, MacComCenter, and x2 are trademarks of 3Com Corporation. Windows is a registered trademark of Microsoft Corp. Macintosh is a registered trademark and Mac is a trademark of Apple Computer, Inc. CompuServe is a registered trademark of CompuServe Inc. America Online is a registered trademark of America Online Inc.
TABLE OF CONTENTS 56K Faxmodem Product Features ............................................................................................... 1-1 Software Installation ................................................................................................................. 2-1 Windows-based systems..................................................................................................................2-1 Macintosh computers .................................................................
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 V.34+ Link Rates 4800, 7200, 9600, 12000, 14400, 16800, 19200, 21600, 24000, 26400, 28800, 31200, 33600 Fax Standards EIA 578 Class 1 FAX EIA 592 Class 2.0 FAX V.
SOFTWARE INSTALLATION Windows-based Systems: 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.
SOFTWARE INSTALLATION The Connections CD contains the RapidComm communications software.
SOFTWARE INSTALLATION modems; RapidComm Voice is used with modems with voice functionality. Once you have installed the Connections program group, you can install the RapidComm software. (The Setup Wizard does not install RapidComm.) Follow these instructions to install RapidComm: 1. Start the Connections CD (follow the instructions in the section “Using Connections Software” on page 2-1). 5. Follow the on-screen instructions to finish the installation.
SOFTWARE INSTALLATION Macintosh Computers: 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. • Double-click the Connections icon on your desktop.
SOFTWARE INSTALLATION modems; RapidComm Voice is used with modems with voice functionality. Once you have installed Connections, you can install the RapidComm software. (The Setup Wizard does not install RapidComm.) Follow these instructions to install RapidComm: 1. Start the Connections CD (follow the instructions in the section “Using Connections Software” on page 2-3). 2. On the main Connections menu, click Software. 5. Click Install Software. 6.
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) PHONE jack. If you are using your communications software to dial speakerphone calls, the software needs to be running in order for you to hear incoming calls.) Disabling the Speaker Feature If you want to talk privately to a caller, you can use a phone handset instead of the speaker. To disable the speaker for the entire call: Do not press the SPEAKER button when the call comes in.
MODEM UPDATE WIZARD Windows-based Systems: Installing the Wizard The Connections CD-ROM, which came with your modem, includes the U.S. Robotics Modem Update Wizard. This software is designed to quickly update your modem to the latest code. 1. Insert the Connections CD into your CD-ROM drive. 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://www.usr.com/home/online).
MODEM UPDATE WIZARD NOTE: For more detailed instructions, see our Web page (http://www.3Com.com/56k). Updating Your Modem 1. Click Start, point to Programs, and then point to U.S. Robotics Modem Update Wizard. Finally, click the Modem Update Wizard selection. 2. Follow the on-screen instructions to complete the update process.
MODEM UPDATE WIZARD Macintosh Computers: Installing the Wizard The Connections CD-ROM, which came with your modem, includes the U.S. Robotics Modem Update Wizard. This software is designed to quickly update your modem to the latest code. 9. Insert the Connections CD into your CD-ROM drive. 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://www.usr.com/home/online).
MODEM UPDATE WIZARD NOTE: For more detailed instructions, see our Web page (http://www.3Com.com/56k). Updating Your Modem 1. Double-click your Hard Drive icon. 2. Double-click the Modem Update Wizard folder. 3. Double-click the Update Wizard icon. 4. Follow the on-screen instructions to complete the update process.
UNINSTALLING A U.S. ROBOTICS MODEM Uninstalling a Winmodem NOTE: These instructions only apply to 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® Faxmodem, see page 5-1. An Internal Faxmodem, see page 5-3. An External Faxmodem, see page 5-4. A Faxmodem for Macintosh, see page 5-5.
UNINSTALLING A U.S. ROBOTICS MODEM 7. Choose the Port Settings tab and then click the Uninstall button. 8. Windows displays the following message: “Warning, you are about to remove this device from your system.” Click OK. The Winmodem is now uninstalled from your system. 9. Next, verify that you completely uninstalled the Winmodem software. Click Start, point to Settings and select Control Panel. 10. Double-click the System icon and click the Device Manager tab.
UNINSTALLING A U.S. ROBOTICS MODEM 14. Remove the computer’s cover. (If you do not know how, refer to your computer’s documentation.) 15. Find the modem inside the computer. (It will be the green board with TELCO (or ) and PHONE (or ) stamped on its metal bracket.) 16. Remove the screw that attaches the modem’s metal bracket to the computer. 2. Double-click the Modems icon. 3. Click to highlight the name of the modem you wish to remove. 4. Click the Remove button.
UNINSTALLING A U.S. ROBOTICS MODEM 7. Turn off and unplug your computer and all peripherals. 8. Remove the computer’s cover. (If you do not know how, refer to the documentation for your computer.) 9. Find the modem inside the computer. (It will be the green board with TELCO (or ) and PHONE (or ) stamped on its metal bracket.) 10. Remove the screw that attaches the modem’s metal bracket to the computer. 11. Remove the modem from its slot. 12. Replace the computer’s cover.
UNINSTALLING A U.S. ROBOTICS MODEM back of your computer marked with a CAUTION : To avoid the risk of electric shock, make sure your computer and all peripheral devices are turned off and unplugged. telephone icon . 10. Unplug the modem’s power adapter from the outlet or power strip. 11. Unplug the modem’s serial cable from the computer. Uninstalling a Faxmodem for Macintosh 1. Turn off your computer. 4. 5.
UNINSTALLING A U.S. ROBOTICS MODEM Once your modem is disconnected, you’ll need to uninstall the RapidComm software. For more information on uninstalling the communications software included with your modem, see the RapidComm manual on your Connections CD.
TROUBLESHOOTING AND HELP RESOURCES When you try to connect to the Internet, you get the error “modem not responding” or “modem in use.” Possible Solutions: • If you have an external modem, make sure that power supply is plugged into the modem and into the electrical outlet, and make sure that the modem has been turned on. • If you have an internal modem, check to make sure that the modem has been firmly inserted into the appropriate slot.
TROUBLESHOOTING AND HELP RESOURCES • You might have a bad phone cord connection to your modem. The phone cord should be plugged into the TELCO jack on the modem and the wall phone jack. The phone cord should be no longer than 12 feet in length. Use the phone cord included in your 3Com box, if possible. • You may have plugged your modem’s phone cord into a digital line. Plugging your modem’s phone cord into a digital phone line can damage the modem.
TROUBLESHOOTING AND HELP RESOURCES ATX3DT18475454248 (the 3Com Macintosh BBS) and press ENTER. If you need to dial 9 to obtain outside phone access, insert a 9 in the above phone number immediately before the 1. This string bypasses the dial tone, allowing a connection if the modem is functioning properly. Your modem cannot achieve a 56 Kbps Internet connection. Possible Solutions: V.90 supports speeds of up to 56K.
TROUBLESHOOTING AND HELP RESOURCES b. Make sure that the number you’re dialing is an actual V.90 server. Some ISPs may have a mixture of V.90 and non-V.90 servers. You can check this by contacting your ISP and asking them about 56K technology or V.90 availability. c. If it is a V.90 server, you may want to try calling it a few more times. Remember, the phone company routes each call in a different fashion each time you place a call.
TROUBLESHOOTING AND HELP RESOURCES Possible Solutions: • You may have plugged your modem’s phone cord into the wrong jack on the modem. Make sure the phone cord is plugged into a jack labeled with the word TELCO or a wall plug icon. • 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. • Click Start, point to Settings, and click Control Panel. Double-click the Modems icon.
TROUBLESHOOTING AND HELP RESOURCES Windows 95 has built-in dial-up network support. Using Dial-Up Networking, you are able to connect to remote servers and Internet providers. Through some easy steps, you can connect to your local Internet provider or Remote Access Service (RAS). The first step in setting up Dial-Up Networking is to make sure the service is installed. The Dial-Up service is located in the Accessories group and is not part of the default installation.
TROUBLESHOOTING AND HELP RESOURCES Close all your applications and restart the system. You are now finished with the installation process. Configuring Dial-Up Networking You first need to add the Dial-Up Adapter. In most cases this will be added automatically. To verify that the Dial-Up Adapter is installed, right-click the Network Neighborhood icon, then click Properties. If you cannot find this icon on your desktop, you can also open up the Network icon in the Control Panel.
TROUBLESHOOTING AND HELP RESOURCES requires it. Make sure that Wait for dial tone before dialing is checked to make sure there is no dialing before the line has been picked up. Once you are done with this, click OK, then Next as stated above. Now you will need to add the number of your Service Provider. After you are done, click Next, and then Finish. Server Configuration Under the Dial-Up Networking program group, click once on the Dial-Up account you just created. Click File and select Properties.
TROUBLESHOOTING AND HELP RESOURCES IP Setting – Possible Scenarios • Your access provider provides you with a specific IP address that you will use every time. If this is the case, make sure that Specify an IP address is checked. Now you must fill in the IP address field with the information your access provider gave you. • Your access provider provides different IPs to you every time you connect. In this case, the provider is using a pool of addresses that are randomly assigned to you.
TROUBLESHOOTING AND HELP RESOURCES Using Dial-Up Networking Now that everything is configured, it’s time to dial out. Click Start, point to Programs, and click Accessories. Click Dial-Up Networking and double-click the new icon you created under Dial-Up Networking. You should see the Connect To screen. Fill in your user name and password and click Connect or press ENTER. After connecting, you should receive a message stating “Status: Verifying user name and password.
TROUBLESHOOTING AND HELP RESOURCES Plug and Play does not detect your modem. You’ve installed the modem and Windows has restarted, but you simply see your desktop. You do not see any screens indicating that new hardware has been detected. Possible Solutions: • The Plug and Play installation was not successful. Try the following: 1. Click Windows Start and click Shut Down. When asked if you wish to shut down your computer, click Yes.
TROUBLESHOOTING AND HELP RESOURCES support options. If you do see one of these options, double-click the option. If the description that appears matches the modem you are trying to install, click the Remove button. Click OK when Windows asks if you wish to remove the device. Next, restart the computer and continue with instructions on the installation map included with your modem. (Internal Modems Only) Another device is using the same COM port or IRQ as your modem and is causing a conflict.
TROUBLESHOOTING AND HELP RESOURCES IRQ Assignment 0 System Timer 1 Keyboard 2 Cascade input (mandatory function) 3 COM2 4 COM1 5 Sound/Parallel Port 2 (LPT2) 6 Disk Controller (All internal floppy drives) 7 Parallel Port 1 (LPT1) 8 Real-time clock interrupt 9 Reserved 10 Reserved 11 Reserved As you can see above, there are no default assignments for COM3 and COM4. In order to use COM3 or COM4, you must assign it to an IRQ.
TROUBLESHOOTING AND HELP RESOURCES its default assignment. This is possible only if the default assignment is not in use. For example, you can assign COM3 to IRQ5, if you are not using LPT2 for a second printer, sound card, or other external parallel device. You cannot assign COM4 to IRQ2 because IRQ2 is being used by the computer for a mandatory function. If you have a mouse attached to COM1, IRQ4 is in use by COM1 and can not be used for COM3.
TROUBLESHOOTING AND HELP RESOURCES • Use the mouse to select the COM port that you are using for your modem. • Click Settings, then Advanced. • Select the IRQ you want to use for your modem. Be sure to select the appropriate COM port in your communications software. Consult your software’s documentation for information on how to make these changes. Most computers come with two external COM ports (COM1 and COM2).
TROUBLESHOOTING AND HELP RESOURCES cards is that many of them share COM4’s memory address space. This can conflict if you try putting a modem on COM4. Please contact your graphic card company for support on this issue. You need to determine which COM port and IRQ each serial interface card in your system is using.
TROUBLESHOOTING AND HELP RESOURCES Sometimes it is necessary to change the IRQ setting on an expansion card to free an IRQ for the modem. For example, if your sound card is using IRQ5, you can reinstall it using IRQ11. This would then free IRQ5 for use by your modem. If you continue to have conflicts, or do not know how to disable the on-board COM ports or other settings, you should contact your computer manufacturer or software manufacturer.
TROUBLESHOOTING AND HELP RESOURCES Help Resources Connecting to the 3Com BBS To connect to the 3Com Bulletin Board System, follow these steps: 1. Start your fax/data communications program. The software settings for our BBS are: ANSI terminal emulation Data Bits: 8 Parity: None Stop Bits: 1 NOTE: ATDS0 (the last digit is a zero) automatically dials 1 847 262 6000, the 3Com BBS.
TROUBLESHOOTING AND HELP RESOURCES 3Com offers a number of other online technical support options. Choose any one of the following options for help with, and/or more information about, your new modem. Internet FTP Provides a free library containing the same files as the BBS site. FTP to ftp.usr.com. Internet on Demand Provides automatic technical support through documents containing product information, quick reference cards, and installation help.
TROUBLESHOOTING AND HELP RESOURCES Are You Still Having Problems? • Review this manual. • Call or visit your modem dealer. They may be able to provide immediate assistance. • If your dealer can't help you, contact 3Com Customer Support. When you call, specify your modem serial number (found on the modem and on the outside of the box), the software being used, and, if possible, have the contents of your ati7 screen available.
TROUBLESHOOTING AND HELP RESOURCES For a no-hold call, a $2.00 per minute charge will appear on your local phone bill. You must be 18 or older or have parental permission. (Service available in the U.S. only.) If You Need to Return the Modem to 3Com for Repair Contact 3Com Customer Support. If the support representative determines that you need to return the modem for repair, you will receive an SRO (Service Repair Order) number. You must have an SRO number before returning the modem to us.
GLOSSARY Cross references are printed in boldface. analog loopback or an internal test pattern is sent to the modem's transmitter, turned into analog form, looped back to analog signals A variety of signals and wavelengths that can be transmitted over communications lines such as the answer mode The mode used by your modem when answering an incoming call from an originating modem. The ARQ Automatic Repeat reQuest. A function that allows be retransmitted. See MNP V.42.
GLOSSARY 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. See command Dn. baud rate A term used to measure the speed of an analog transmission from one point to another. Although not technically accurate, baud rate is commonly used to mean bit rate. binary digit A 0 or 1, reflecting the use of the binary numbering system.
GLOSSARY 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). Some protocols, such as error-control protocols, employ advanced techniques such as longer transmission frames and data compression to increase cps. class 1 and 2.
GLOSSARY 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. duplex Indicates a communications channel capable of carrying signals in both directions. See half duplex, full duplex. dictionary The term used for compression codes built by the V.42 bis data compression algorithm. Electronic Industries Association (EIA) Group which defines electronic standards in the U.S.
GLOSSARY 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. The added information usually includes a frame number, block size data, error-check codes, and Start/End indicators. full duplex Signals can flow in both directions at the same time over one line.
GLOSSARY LAPM Link Access Procedure for Modems. An errorcontrol protocol defined in ITU-T recommendation V.42. Like the MNP protocols, LAPM uses cyclic redundancy checking (CRC) and retransmission of corrupted data (ARQ) to ensure data reliability. local echo A modem feature that enables the modem to display keyboard commands and transmitted data on the screen. See command En. MNP Microcom Networking Protocol, an error-control protocol developed by Microcom, Inc., and now in the public domain.
GLOSSARY checking has been surpassed by more reliable and efficient forms of error checking, including V.42 and MNP 2-4 protocols. Either the same type of parity must be used by two communicating computers, or both may omit parity. remote echo A copy of the data received by the remote system, returned to the sending system, and displayed on the screen. Remote echoing is a function of the remote system. protocol A system of rules and procedures governing communications between two or more devices.
GLOSSARY terminal mode Software mode that allows direct communication with the modem. Also known as command mode. throughput The amount of actual user data transmitted per second without the overhead of protocol information such as start/stop bits or frame headers and trailers. Compare with characters per second. V.8 The ITU-T standard specification that covers the initial handshaking process. V.17 fax An ITU-T standard for making facsimile connections at 14,400 bps, 12,000 bps, 9600 bps, and 7200 bps. V.
GLOSSARY 14,400 bps. V.32 bis modems fall back to the next lower speed when line quality is impaired, fall back further as necessary, and also fall forward (switch back up) when line conditions improve (see online fall back/fall forward). V.34 An ITU-T standard that currently allows data rates as high as 28,800 bps. V.34+ An enhancement to V.34 that enables data transfer rates as high as 33,600 bps. V.
GLOSSARY These protocols are in the public domain and are available from many bulletin board services. XON/XOFF Standard ASCII control characters used to tell an intelligent device to stop/resume transmitting data. Ymodem An error-checking protocol that can send several files of data at a time in 1024-byte (1K) blocks. This protocol can use either checksums or CRC for error checking. Ymodem G Similar to Ymodem, except it includes no error checking, which makes it faster.
TECHNICAL REFERENCE Front-of-the-Case Lights (External Faxmodems) ................8-2 Top-of-the-Case Lights (Voice Faxmodem Pro Externals) ..8-3 Typing Commands ..................................................................8-4 Basic Data Commands ............................................................ 8-5 Extended Data Commands ................................................... 8-12 DIP Switches.........................................................................8-20 S-Registers .............
TECHNICAL REFERENCE Front-of-the-Case Lights (External Faxmodems) Symbol Meaning AA .......... Auto Answer CD........... Carrier Detect RD........... Received Data SD ........... Send Data TR ........... Data Terminal Ready CS ........... Clear to Send ARQ/....... Error Control/ FAX ........ Fax Operations 8-2 Status 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.
TECHNICAL REFERENCE Top-of-the-Case Lights (Voice Faxmodem Pro Externals) Light What It Means When Lighted POWER ....................The modem is turned on. SEND........................The computer is sending a data bit to the modem. RECEIVE..................The modem is sending result codes or passing received data bits from the remote. ONLINE....................The modem is online. (NOTE: This light blinks when the mute feature is being used.
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 A> Re-executes the last issued command continuously, until the user intervenes or the command is executed forever. Does not require the AT prefix or a Carriage Return. Any key Aborts off-hook dial/answer operation and hangs up. AT Required command prefix, except with A/, +++, and A>. Use alone to test for OK result code. Bn U.S./ITU-T answer sequence. S Stop or restart help screens. C or K Stop help screens.
TECHNICAL REFERENCE Dn Dials the specified phone number. Includes the following: ; 0-9 #, * “ L P R Sn T , 8-6 Numeric digits Extended touch-tone pad tones Dials the last dialed number. Pulse (rotary) dial Originates call using answer (reverse) frequencies. Dials the phone number string stored in NVRAM at position n (n = 0−3). Phone numbers are stored with the &Zn=s command. Tone dial (Comma) Pause, See S8 definition; which it’s linked to.
TECHNICAL REFERENCE 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 Controls ON/OFF hook. H0 Hangs up (goes on hook). H1 Goes off hook. In Displays the following information.
TECHNICAL REFERENCE Mn On P Qn 8-8 Operates speaker. M0 Speaker always OFF. M1 Speaker ON until CONNECT. M2 Speaker always ON. M3 Speaker ON after dial, until CONNECT. Returns online. O0 Returns online. O1 Returns online and retrains. Sets pulse dial (for phone lines that don’t support touch-tone dialing). Displays/suppresses result codes. Q0 Displays result codes. Q1 Q2 Quiet mode; no result codes. Displays result codes only in Originate mode. Sr.b=n Sets bit .b of register r to n (0/OFF or 1/ON).
TECHNICAL REFERENCE Xn Sets result code displayed. Default is X4. (NOTE: Result codes 0 through 155 are for 33.6 products and V.90 products. Result codes above 155 apply only to V.90 products.
TECHNICAL REFERENCE Xn 8-10 Result Codes (cont.
TECHNICAL REFERENCE Yn Z 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 Z2 Z3 Z4 Z5 Resets modem to NVRAM profile 1 Resets modem to factory default profile 0 (&F0) Resets modem to factory default profile 1 (&F1) Resets modem to factory default profile 2 (&F2) 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 additional result code subsets (see Xn). &A0 ARQ result codes disabled &A1 ARQ result codes enabled &A2 V.32 modulation indicator added &A3 Protocol indicators added LAPM/MNP/NONE (error control) and V42bis/MNP5 (data compression) &Bn Manages modem’s serial port rate.
TECHNICAL REFERENCE &Gn Sets Guard Tone. &G0 No guard tone, U.S. and Canada &G1 550 Hz guard tone, some European countries, requires B0 setting. &G2 1800 Hz guard tone, U.K., requires B0 setting. &In &Hn Sets Transmit Data (TD) flow control (see also &Rn). &H0 Flow control disabled &H1 Hardware flow control, Clear to Send (CTS) &H2 Software flow control, XON/XOFF &H3 Hardware and software flow control &Kn Enables/disables data compression.
TECHNICAL REFERENCE &Mn Sets Error Control (ARQ) for connections at 1200 bps and higher. &M0 Normal mode, error control disabled &M1 Reserved &M2 Reserved &M3 Reserved &M4 Normal/ARQ &M5 ARQ mode &Nn Sets connect speed. If connection cannot be made at this speed, the modem will hang up. 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). NOTE: &N17 through &N39 apply only to V.90 products.
TECHNICAL REFERENCE &N19 &N20 &N21 &N22 &N23 &N24 &N25 &N26 &N27 &N28 &N29 &N30 &N31 &N32 &N33 &N34 &N35 &N36 &N37 &N38 &N39 30,666 bps 32,000 bps 33,333 bps 34,666 bps 36,000 bps 37,333 bps 38,666 bps 40,000 bps 41,333 bps 42,666 bps 44,000 bps 45,333 bps 46,666 bps 48,000 bps 49,333 bps 50,666 bps 52,000 bps 53,333 bps 54,666 bps 56,000 bps 57,333 bps &Pn Sets pulse (rotary) dial make/break ratio. &P0 U.S./Canada ratio, 39%/61% &P1 U.K.
TECHNICAL REFERENCE &Tn Begins test modes. &T0 &T1 &T2 &T3 &T4 &T5 &T6 &T7 &T8 8-16 Ends testing Analog Loopback Reserved Local Digital Loopback Enables Remote Digital Loopback Prohibits Remote Digital Loopback Initiates Remote Digital Loopback Remote Digital with self-test and error detector Analog Loopback with self-test and error detector &Un When set above 0, the value chosen from the table sets the floor connect speed (the lowest acceptable connect speed).
TECHNICAL REFERENCE &U0 No restrictions on the minimum speed for the connection.
TECHNICAL REFERENCE &Wn Writes current configuration to NVRAM templates. &W0 Modifies the NVRAM 0 template (Y0) &W1 Modifies the NVRAM 1 template (Y1) &Yn Sets break handling. &Y0 Destructive, but doesn’t send break &Y1 Destructive, expedited &Y2 Nondestructive, expedited &Y3 Nondestructive, unexpedited &Zn=s Writes phone number string s to NVRAM at position n (n = 0−3). &Zn=L Writes last executed dial string to NVRAM at position n (n = 0−3).
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.
TECHNICAL REFERENCE Factory Switch Setting Function 6 OFF 7 OFF 8 ON 8-21 Carrier Detect (CD) Override OFF Modem sends CD signal when it connects with another modem, drops CD on disconnect ON CD always ON (Override) Power-on and ATZ Reset Software Defaults OFF Loads Y0-Y4 configuration from user-defined nonvolatile memory (NVRAM) ON Loads &F0Generic template from read only memory (ROM) AT Command Set Recognition OFF Disables command recognition (dumb mode) ON Enables recognition (smart mode)
TECHNICAL REFERENCE S-Registers To change a setting, use the ATSr=n command, where r is the register and n is a decimal value from 0 − 255 (unless otherwise indicated). Register Default Function S0 0 Sets the number of rings on which to answer in Auto Answer mode. When set to 0, Auto Answer is disabled. S1 0 Counts and stores the number of rings from an incoming call. (S0 must be greater than 0.) S2 43 Stores the ASCII decimal code for the escape code character. Default character is +.
TECHNICAL REFERENCE Register Default Function S6 2 Sets the number of seconds the modem waits before dialing. If Xn is set to X2 or X4, this is the time-out length if there isn't a dial tone. S7 60 Sets the number of seconds the modem waits for a carrier. May be set for much longer duration if, for example, the modem is originating an international connection. S8 2 Sets the duration, in seconds, for the pause (,) option in the Dial command.
TECHNICAL REFERENCE 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.* 2 4 Set backspace key to delete. 3 8 On DTR signal, autodial the number stored in NVRAM at position 0.
TECHNICAL REFERENCE Register Default Function S14 0 Reserved S15 0 Bit-mapped register setup. To set the register, see instructions for S13. Bit 0 1 2 3 4 5 6 7 Value 1 2 4 8 16 32 64 128 Result Disable ARQ/MNP for V.22. Disable ARQ/MNP for V.22bis. Disable ARQ/MNP V.32/V.32bis. Disable MNP handshake. Disable MNP level 4. Disable MNP level 3. MNP incompatibility. Disable V.42 operation. To disable V.
TECHNICAL REFERENCE Register Default Function 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 the duration, in minutes, for the inactivity timer. The timer activates when there is no data activity on the phone line; at time-out the modem hangs up. S19 = 0 disables the timer.
TECHNICAL REFERENCE Register Default S27 8-27 0 Function Bit-mapped register setup. To set the register, see instructions for S13. Bit 0 Value 1 1 2 2 3 4 8 4 5 6 7 16 32 64 128 Result 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). Enables unencoded (non-trellis coded) modulation in V.32 mode. Disables V.32 modulation.
TECHNICAL REFERENCE Register Default Function S28 0 Eliminates the V.32 answer tones for a faster connection. 8 Default item, all times are in tenths of seconds. 255 Disables all connections except V.32 at 9600 bps. S29 20 Sets the duration, in tenths of a second, of the V.21 answer mode fallback timer. S30 0 Reserved S31 128 Reserved S32 2 Bit-mapped register setup. To set the register, see the instructions for S13. Bit 0 1 2 3 4 5 6 7 Value 1 2 4 8 16 32 64 128 Result V.
TECHNICAL REFERENCE Register Default S33 0 Function Bit-mapped register setup. To set the register, see the instructions for S13. Bit 0 1 2 3 4 5 6 7 S34 0 Result Disable 2400 symbol rate. Disable 2743 symbol rate. Disable 2800 symbol rate. Disable 3000 symbol rate. Disable 3200 symbol rate. Disable 3429 symbol rate. Reserved Disable shaping. Bit-mapped register setup. To set registers, see instructions for S13.
TECHNICAL REFERENCE 7 128 Disable Pre-coding.
TECHNICAL REFERENCE Register Default Function S35-S37 S38 0 Reserved Sets an optional delay, in seconds, before a forced hang-up and clearing of the Transmit buffer when DTR drops during an ARQ call. This allows time for a remote modem to acknowledge receipt of all transmitted data before it is disconnected. The modem immediately hangs up when DTR drops. This option only applies to connections terminated by dropping DTR. If the modem receives the ATH command, it ignores S38 and immediately hangs up.
TECHNICAL REFERENCE S42 0 Reserved 8-32
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 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 +FTM=n Transmits data using the modulation specified by n. (n = 3, 24, 48, 72, 96, 97, 98, 121, 122, 145, or 146) Note: See the “Screen Messages” table at the end of this section for an explanation of messages that appear in response to this command. +FRM=n Receives data using the modulation specified by n.
TECHNICAL REFERENCE Note: See the “Screen Messages” table at the end of this section for an explanation of messages that appear in response to this command.
TECHNICAL REFERENCE 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. 6 NO DIAL TONE (Optional) Dial tone was not received within the time-out period.
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.
TECHNICAL REFERENCE Serial Interface Pin Definitions DB-25 DB-9 Circuit 1 2 3 4 5 6 7 8 12 20 22 — 3 2 7 8 6 5 1 — 4 9 AA BA BB CA CB CC AB CF SCF CD CE Function Signal Source Computer/Modem Chassis Ground Transmitted Data Received Data Request to Send Clear to Send Data Set Ready Signal Ground Carrier Detect Speed Indicate Data Terminal Ready Ring Indicate Both Computer Modem Computer Modem Modem Both Modem Modem Computer Modem 8-38
REGULATORY INFORMATION AND LIMITED WARRANTY Notice: This modem was not designed or approved for use in Europe, Australia, and New Zealand. Part 15: Operation is subject to the following two conditions: Manufacturer’s Declaration of Conformity (1) this device may not cause harmful electromagnetic interference, and 3Com Corporation 3800 Golf Road Rolling Meadows, Illinois 60008 U.S.A.
REGULATORY INFORMATION AND LIMITED WARRANTY You must provide this information to the telephone company if requested. The REN is used to determine the number of devices you may legally connect to your telephone line. In most areas, the sum of the REN of all devices connected to one line must not exceed five (5.0). You should contact your telephone company to determine the maximum REN for your calling area. This equipment may not be used on coin service provided by the telephone company.
REGULATORY INFORMATION AND LIMITED WARRANTY dans la norme sur le matériel brouilleur: Appareils Numériques, NMB-003 édictée par l'Industrie Canada. UL Listing/CUL Listing (Internal Products Only) This information technology equipment is UL-Listed and CUL-Listed for use with UL-Listed personal computers that have installation instructions detailing user installation of card cage accessories.
REGULATORY INFORMATION AND LIMITED WARRANTY to correct the problem with one or more of the following measures: • Reorient the receiving antenna (for televisions with antenna reception only) or cable input device. • Relocate the computer with respect to the receiver. • Relocate the computer and/or the receiver so that they are on separate branch circuits. If necessary, consult your dealer or an experienced radio/television technician for additional suggestions.
REGULATORY INFORMATION AND LIMITED WARRANTY appropriate Terminal Equipment Technical Requirements document(s). The Department does not guarantee the equipment will operate to the user’s satisfaction. Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local telecommunications company. The equipment must also be installed using an acceptable method of connection.
REGULATORY INFORMATION AND LIMITED WARRANTY CAUTION: Do NOT attempt to make such connections yourself. Instead, contact an electric inspection authority or electrician, as appropriate. WARRANTY AND REPAIR SERVICE CENTER: Keating Technologies 25 Royal Crest Court, Suite 200 Markham, ONT L3R 9X4 «AVIS : L'étiquette d'Industrie Canada identifie le matériel homologué.
REGULATORY INFORMATION AND LIMITED WARRANTY Pour sa propre protection, l'utilisateur doit s'assurer que tous les fils de mise à la terre de la source d'énergie électrique, des lignes téléphoniques et des canalisations d'eau métalliques, s'il y en a, sont raccordés ensemble. Cette précaution est particulièrement importante dans les régions rurales.
REGULATORY INFORMATION AND LIMITED WARRANTY 3Com warrants any replaced or repaired product or part for ninety (90) days from shipment, or the remainder of the initial warranty period, whichever is longer.
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 LAW, THE FOREGOING WARRANTIES AND REMEDIES ARE EXCLUSIVE AND ARE IN LIEU OF ALL OTHER WARRANTIES, TERMS, OR CONDITIONS, EXPRESS OR IMPLIED, EITHER IN FACT OR BY OPERATION OF LAW, STATUTORY OR OTHERWISE, INCLUDING WARRANTIES, TERMS, OR CONDITIONS OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, SATISFACTORY QUALITY, CORRESPONDENCE WITH DESCRIPTION, AND NONINFRINGEMENT, ALL OF WHICH ARE EXPRESSLY DISCLAIMED.
REGULATORY INFORMATION AND LIMITED WARRANTY LIMITATION OF LIABILITY.
REGULATORY INFORMATION AND LIMITED WARRANTY This warranty gives you specific legal rights which may vary depending on local law. GOVERNING LAW: This Limited Warranty shall be governed by the laws of the State of California, U.S.A. excluding its conflicts of laws principles and excluding the United Nations Convention on Contracts for the International Sale of Goods.
