Telepath^® with X2 Technology
User's Guide

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Specifications Specifications are subject to change without notice or obligation. Configuration Standard half-size expansion card Interface 8-bit ISA-bus connector COM ports and interrupts Supports choice of four COM ports and five interrupts (IRQ 2-5, 7); selection made with clearly marked jumpers; Supports MicroSoft Plug and Play version 1.0a - for automatic configuration under Windows 95 Fax modes Supports Group 3 send and receive facsimile using fax service class 1 (EIA/TIA-578) and Class 2.0 (EIA/TIA-592) commands, DCE Control Standard; supports V.29, V.27 ter, V17, and V.21 channel 2 recommendations for sending fax at 14,400, 9600, 7200, 4800, 2400 or 300bps with automatic sensing and adjustment Data modes Supports ITU-T V.34 [annex], V.34, V.FC, V.32bis, V.32, V.22bis, V.22, V.21, Bell 212A and 103 Loopback testing V.54 analog, digital, and remote digital Modem speed Operates in data mode at speeds up to 33,600 bps; data compression increases effective throughput (depending upon the file structure); fax mode at speeds up to 14,400 bps Error correction V.42 (preferred) and MNP2-4 (fallback) for error-free operation over noisy telephone lines; modem also operates without error correction Data compression V.42bis and MNP5; up to 115,200 bps throughout; modem also operates without data compression Automatic negotiation For ease of operation, the modem automatically negotiates with the remote modem, adjusting speed, error control, and data compression for maximum efficiency and compatibility Compatibility Communicates with virtually any modem adhering to ITU-T or Bell standards. The maximum rate of 33,600 bits per second is attainable only with other modems that support V.34 [annex] or similarly equipped US Robotics modems. Modems (such as the US Robotics HST or Telebit PEP) using proprietary protocols are not compatible with the TelePath with X2 technology at speeds above 2400 bps. This modem supports asynchronous operation Ringer equivalence 0.4B Modem command set Enhanced AT command set, compatible with Hayes™ V-series commands Telephone lines Operates over dial-up lines; auto-answer, originate with tone or pulse Onboard diagnostics Remote and local digital and analog loopback; power-on self test Connectors Two RJ-11C modular phone jacks for line and telephone connections; 3.5mm line out and microphone jacks Audio monitor Onboard speaker Certification UL, FCC Class B, FCC Part 68, DOC, CSA Many Gateway 2000 products are custom engineered by our suppliers to Gateway 2000 specifications, and may vary with similarly marketed products.   Introduction Your TelePath® with X2 technology modem provides you with a cost-effective way to handle almost all your computer communications requirements, including voice, data, and fax transmissions. This modem features automatic negotiation, allowing it to connect with modems from many manufacturers. It also has the popular Speakerphone feature, which now gives you the convenience to freely perform other functions while speaking on the phone. As a data modem, the TelePath with X2 technology adheres to ITU-T V.34 recommendations. This means that the modem is capable of full duplex operation at speeds up to 28,800 bps (bits per second) over dial-up telephone lines. Modem speeds up to 33,600 are possible when connecting with another V.34 [annex] modem such as an identical modem or certain V.34 modems made by US Robotics. As with any modem, the highest communications speeds are possible only under ideal conditions. If noise that could cause errors is present on the telephone lines, the modem will automatically compensate by reducing transmission speed. The TelePath with X2 technology has excellent data communications and fax send/receive software. For data communications, it supports the full AT command set with enhanced Hayes V-series commands. The TelePath with X2 technology also supports the latest X2 technology from US Robotics. When connected to X2 host equipment, the modem can download up to 56,000bps on a perfect line. (Current FCC regulations limit the transfer rate to 53,000bps.) The upload transfer rate remains at the standard V.34 rate. As a fax modem, the TelePath with X2 technology supports Group 3 facsimile send and receive, which allows it to communicate with nearly every fax machine in the world. It accepts Class 1 and 2.0 commands. This lets the modem function with nearly all popular communications software packages. With the appropriate software, the TelePath with X2 technology can provide you with voice mail management. Using this feature, you can play or send voice greetings and record messages like a standard answering machine. It provides a feature that allows you to remotely access your voice messages. The modem automatically detects and deals with fax or voice calls. The modem also detects Caller ID data if it is available. Caller ID Support allows you to identify who is calling before the telephone is answered. Call your local telephone company to make sure Caller ID is available in your area. The application software included with the modem can display the caller identification information if it is available. The modem supports Distinctive Ringing if available. Distinctive Ringing is a service provided by your local phone company. Distinctive Ring can ring your line so that you can have more than one number assigned by the Central Office to the same physical line in your home. A common use of this feature would be to have fax calls coming in on one number and voice calls coming in on another. You will then hear a different ring when a fax call comes in and will know not to answer that call like you would a normal voice call. Your modem can recognize different types of Distinctive Ringing. Please check with your phone company regarding which types are available in your area. The Speakerphone feature provides you with a full-duplex Speakerphone without the echoing effect found on many Speakerphones. With the TelePath with X2 technology modem, you are now able to enjoy this "hands free" convenience without additional hardware and cords for your home and/or office.   Features Full-duplex Speakerphone capability Plug and play compatible Operating modes: X2: allows connections to X2 host equipment at up to 53,000bps V.34 [annex], V.34, V.32bis, V.32, V.22bis, V.22, V.21 Bell 212A and 103 V.17, V.29, V.27ter, V.21 channel 2 Group 3 send and receive facsimile Error correction (V.12/MNP 2-4) Data compression (V.42 bis/MNP 5) Communication software command sets: Enhanced AT command set Fax class 1 and 2.0 commands Built-in DTE interfaces: DTE speed to 115,200 bps Parallel 16C550 UART interface Line quality receive level monitoring NVRAM directory stored profiles and four phone numbers Programmable speaker volume control Flow control (XON/XOFF, RTS/CTS) Inactivity timer Displays help screens, modem settings, call progress Automatic format/speed sensing Voice mail capability Distinctive Ring capability, where available Caller ID capability, where available Diagnostics: Remote digital loopback and self test Analog loop and analog loopback self test Digital loopback test Power-on self test.   Installing and configuring the modem   Setting the jumpers If you purchased your modem as part of a complete computer system, you can skip this chapter. Your modem was installed and configured when shipped.   Plug and play mode jumper settings Complete this segment if you are using the Windows 95 Plug and Play operating mode. If you are not using Plug and Play, proceed to "ISA mode jumper settings." To use the Plug and Play function, locate the COM port and IRQ jumpers. Next, remove all the shunts from these jumpers. Windows 95 will internally configure the COM port and IRQ settings for you. Proceed to "Installing the TelePath with X2 Technology Modem." Figure 1: Modem card w/ jumpers Figure 2: Typical jumper pin pair w/ removed shunt   ISA mode jumper settings Complete this segment if you are using a non-Plug and Play mode setting such as ISA. Select the COM port and IRQ settings for your modem. The following table provides acceptable configurations and displays an asterisk (*) next to default/recommended settings. Remember to use these settings when you configure your software communications package. To set a jumper, gently lift off the shunt and place it over the appropriate pin pair indicated in the table. If two devices use the same IRQ at the same time, the computer malfunctions, so always set the modem for an unused IRQ. (IRQ 5 is not available if your system uses both parallel ports, has an LMSI CD-ROM, or uses a sound card.) If an installed device doesn’t use an IRQ, you can use the IRQ normally associated with that device. If your communications software does not require an IRQ, place the shunt over a single pin (rather than a pair of pins) to disable the modem IRQ. Be sure to place the shunt on a top (closer to the center of the card) pin to avoid seating problems. Proceed to "Installing the TelePath with X2 Technology Modem."   Installing the modem Before opening your system case, read and follow these preventions and precautions to prevent damage from static electricity. Caution! Preventing Static Electricity Damage The components inside your system are extremely sensitive to static electricity, also known as electrostatic discharge (ESD). Static electricity can cause irreparable damage to your system; however, if you follow these preventions and precautions, you should prevent such damage. Static Electricity Preventions WEAR A GROUNDING WRIST STRAP (available at most electronic stores). Turn off the system power. Touch the back of the power supply fan, located on the back of the case. UNPLUG ALL CORDS FROM WALL OUTLET. Remove the system case cover. Static Electricity Precautions Avoid static-causing surfaces such as plastic and styrofoam in your work area. Remove parts from their antistatic bags only when you are ready to use it. Do not lay parts on the outside of antistatic bags since only the inside provides antistatic protection. Always hold cards by their edges and their metal mounting bracket. Avoid touching components on the cards and the edge connectors that connect to expansion slots. Never slide cards or other parts over any surface.   To install the TelePath with X2 technology modem: Remove the modem from its anti-static bag. Make sure the jumpers are set appropriately. (Refer to "Setting the jumpers.") Shut down the computer system. Remove your system's cover according to the instructions in your system guide. Be sure to follow all the static electricity preventions and precautions shown above prior to touching any internal components in your computer. Locate an expansion slot near your sound card and remove the screw that holds it in place. Keep the screw. If you did not purchase a Speakerphone kit with your modem, skip steps 5 and 6. Before inserting the modem into the slot, locate the Speakerphone cable that was shipped with your TelePath modem. Figure 3. Speakerphone cable Carefully connect one end of the cable to the J8 ATAPI connector, located near the top of the TelePath modem card. Do not handle the ISA bus connector or the other delicate components located on the card. The cable connector is keyed so that it only fits in the J8 ATAPI connector when it is inserted properly. Figure 4. Modem card’s J8 ATAPI connector Press the modem straight into the slot. Be sure to push evenly on both edges until the card is firmly seated. You may need to press in on the bottom of the metal bracket to keep it from catching on the case. It’s OK to slightly seesaw a card end-to-end as you work it into the slot, but do not bend the card sideways. Secure the card to the case with the screw you removed in step 4. If you did not purchase a Speakerphone kit with your modem, skip step 9. If your system features an Ensoniq™ Vivo sound card, carefully connect the other end of the Speakerphone cable to the J1 ATAPI connector located near the top of the sound card. Figure 5. Ensoniq sound card If your system features a Sound Blaster 16 sound card, remove the card from its expansion slot, connect the other end of the Speakerphone cable to the J3 header on the sound card, and replace the sound card into its expansion slot. Be sure to orient the end of the Speakerphone cable so that the "handle" side faces away from the card’s bracket. Figure 6. SoundBlaster sound card If your system features integrated sound connectors, carefully connect the other end of the Speakerphone cable to the Modem header on the system board. Figure 7. Integrated Sound Connectors Check all cable connections and replace the system unit cover. Proceed to "Connecting the Telephone and Modem."   Connecting the telephone and modem   To connect the telephone and modem: Connect one end of the modem cable to the TelePath’s LINE IN jack. Connect the other end of this cable to the telephone jack on the wall. (Optional) Connect the free end of a standard telephone’s cable to the TelePath’s TO PHONE jack. The telephone will operate normally even when the computer is off. Figure 8. External Modem Jacks   Configuring the modem The following section has two segments: "For Windows 95 systems" (utilizing Plug and Play) and "For Windows 3.1 and Windows for Workgroups." Proceed to the segment that applies to your computer system.   For Windows 95 systems   To configure the modem: Start the computer. After Windows 95 starts, the New Hardware Found dialog box is displayed. The system recognizes the new hardware (modem and/or sound card) and prompts you to select which driver you want to install for your new hardware. Click Cancel; the drivers for the modem will be installed later. Right-click the My Computer icon to make a menu appear. Click Properties. The System Properties screen appears. Click the Device Manager tab to make the "device tree" appear. Double-click Ports to make another level of the "device tree" appear. Double-click COM 2. The Communications Port (COM2) Properties screen appears. Click Original Configuration in the Device Usage section near the bottom of the screen to make the check mark in the box disappear. Click OK. Depending on your system, the Communications Port (COM 2) will display a red "X," display a yellow "!," or disappear. The modem will be configured to utilize the system resources that have just been freed. Click Close. Click Start and Shut Down. The Shut Down screen appears. Click Restart the computer?, then click Yes. The system will restart. Press <F1> when the screen displays, "Press F1 for Setup." This will enter the CMOS Setup utility to allow you to check the port settings. Use the right arrow key to highlight Advanced. Then highlight Peripheral Configuration and press <Enter>. Highlight Configure Mode. Then press <Enter> and select Manual (system may also default to Manual). Use the down arrow to select Serial Port 1 Address (make sure it is set to COM 1 3F8 IRQ4). If it is not, press <Enter>, change the setting to COM 1 3F8 IRQ4 and press <Enter> again. Use the down arrow to select Serial Port 2 Address. Then press <Enter>, select Disabled (may already be disabled) and press <Enter> again. Press <F10> and <Enter> to save and exit the Setup utility. This will cause the system to restart. After Windows 95 starts, the New Hardware Found dialog box is displayed. Click Driver disk provided by the manufacturer, then click OK. The Install From Disk dialogue box is displayed. It asks you to insert the manufacturer’s installation disk into the selected drive. Insert the TelePath with X2 technology Modem Configuration diskette (shipped with your modem) into your diskette drive (A:). Make sure that the drive letter and path in the box match the location where the diskette is loaded (i.e. A:\ or D:\[path]), then click OK. The drivers for the modem will then be loaded by the system. Right-click the My Computer icon after the Windows 95 screen appears to make a menu appear. Click Properties. The System Properties screen appears. Click the Device Manager tab to make the "device tree" appear. Double-click Modem to make another level of the "device tree" appear. This level displays the system’s Modem (i.e. TelePath with X2 Technology). Click the Modem tab and verify the Port setting is COM 2. Configuration is complete. Install the communications software using the diskette/CD.   For Windows 3.1 and Windows for Workgroups   To configure the modem: Start the computer system. Enter the CMOS setup utility. Disable the COM port you have set up for the modem. Exit and reboot. (See the sections about the COM ports and the Setup utility in your system’s User’s Guide for details.) Configuration is complete. Install the communications software using the diskette or CD.   Settings This section provides an overview of basic modem settings and is designed to get you started quickly using your TelePath with X2 technology. We recommend you use all of the modem’s factory settings except for flow control and the serial port rate. Anytime you wish to change the modem’s settings or give it instructions, you use AT commands. (These commands are fully explained in "Using the TelePath with X2 Technology Modem" and in the "Command summary." For now, just remember to type in the following command lines as instructed below.)   Modem settings We recommend the following settings for most situations. Note that to use these recommended settings, your software must also support them. (See "Software settings" below.) Transmit Data Flow control is factory set as disabled (AT&H0); we recommend that you enable this function. To do this, enter your software’s terminal mode and press <Enter>. The modem sends Clear to Send (CTS) signals to the computer to control the data flow. Flow control is required for error control and when the serial port rate is higher than the connection rate. (The AT&H2 setting, software flow control, may affect data reliability.) Received Data Flow control is factory set to ignore received data (AT&R1); we recommend that you change this function. To do this, enter your software’s terminal mode and press <Enter>. The computer sends Request to Send (RTS) signals to the modem to control the data flow. The Serial Port Rate is set to follow the connection rate (AT&B0); we recommend that you change this so that the serial port rate remains fixed at the rate of the last AT command. To do this, enter your software’s terminal mode and press <Enter>. The serial port rate does not switch to match the phone connection rate when the modem connects with a remote modem at a lower rate. Your software must first be set to a fixed rate. (See "Software settings" below.) If your software supports AT&H1, AT&R2, and AT&B1, we recommend that you make them your power-on and reset defaults by writing them to nonvolatile memory. (See "Storing defaults in NVRAM.")   Software settings Hardware flow control: Select your software’s option for hardware flow control. Many programs combine both hardware flow control commands, CTS/RTS (Clear to Send/Request to Send), as one option. Some software supports both hardware and software flow control, but requires you to turn off the kind you’re not using. Check your software manual. 57.6 or 38.4Kbps: Set a high serial port rate between the modem and the computer. A rate of at least 38.4Kbps is required to make a 28.8Kbps connection. In most operating systems, 57.6Kbps is best when a call is under error control and data compression. If you are certain that your software can handle 115,200bps, you can use this speed. We recommend that you use this high speed only if necessary. If part of your system can’t handle it, you could lose data. If you’re not sure of your system’s capabilities, use 38.4Kbps, which is efficient and reliable. Fixed Rate: Many programs that support a fixed serial port rate control this function with an Auto Baud Detect toggle. Toggle Auto Baud Detect OFF and the software serial port rate will remain high, even if the phone connection is as low as 300 bps. Your software may call this Locking the Port Speed.   Changing settings When you change a setting, the modem retains it until you do one of the following: Change the setting again. Issue the ATZ command to reset the modem. Issue the AT&Fn command to reset the modem to one of its factory settings. If you are in Windows or any other program, exit Windows (and all the other software) and switch the system off and on again. The modem loads the factory settings.   Storing defaults in NVRAM If you change the modem’s settings from their default values and want to save these changes as new power-on and reset values, you can write them to nonvolatile memory (NVRAM). Follow the instructions below to save changes. The default settings and other AT command options are fully explained in "Using the TelePath with X2 Technology Modem" and in "Command summary."   To store settings in NVRAM: Restart the computer and enter your communication software’s terminal mode. Set the communications parameters and other settings you want with the appropriate AT commands or menu selections in your software. For example, if you want the comma (pause) to last for one second instead of the default two seconds, type: ATS8=1 &W and press <Enter>. Be sure to type &W last in the string. The &W writes all the settings you have made into NVRAM. It is not necessary to enter the settings one at a time. You can make several settings on a line, then use the "&W." Now the modem loads the defaults from NVRAM at start up and reset. If you set the modem correctly, it is almost impossible to lock up communication between your system and the modem. If it should happen, however, enter the command AT&F1 in terminal mode. This loads the permanent factory settings. Then insert the correct setting in a new &W command.   Testing the modem installation Follow these steps to verify that the modem is working properly. (See "Using the TelePath with X2 Technology Modem" and "Command summary" for details on changing settings with AT commands.)   To verify the modem is functioning: Load your communications software and enter the terminal mode. Set the serial port rate to 115,200, 57,600, 38,400, or 19,200 bps. We recommend 57,600 or 38,400. Set the software to the serial port used by the modem: COM 1, 2, 3, or 4 (default is COM 2). Set the data format to a word length 8 bits with no parity and 1 stop bit. In the terminal screen, type: AT E1 Q0 V1 and press <Enter>. "OK" should appear on the next line.   Speakerphone feature The Speakerphone feature of the TelePath with X2 technology modem provides you with full-duplex Speakerphone use without the echoing effect found on many Speakerphones. Figure 9. Speakerphone Assembly If your system features integrated sound connectors or a compatible sound card, you need only connect an electret condenser microphone to your modem’s MIC jack to use the Speakerphone features. If your system does not feature integrated connectors or a sound card, you will need to connect both an electret condenser microphone to your modem’s MIC jack and an amplified speaker to your modem’s LINE OUT jack to use the Speakerphone features. Figure 10. Modem jacks   Activating the Speakerphone   To activate the Speakerphone: Locate the microphone that was shipped with your kit. It must be an electret condenser microphone. The microphone supplied with the modem is recommended for use of the Speakerphone feature. Connect the microphone cord to the MIC jack, located on your Telepath modem. This enables the Speakerphone features of the modem. You are now ready to use the Speakerphone. If you have a sound card, make sure the speakers are connected to the output jack on the sound card. Optimizing use of the Speakerphone feature: The modem output must be amplified before applying it to the speaker(s). Make sure the microphone and the speaker(s) are one to three feet apart, and not directly facing each other. This helps to avoid acoustical coupling, which causes a squealing or echoing effect. In some situations (noisy office, etc.) the modem may find it difficult to achieve a satisfactory level of full-duplex operation. In this case, the modem will fall back to a half-duplex mode of operation. When in half-duplex mode, only one party can speak at a time. If the modem finds it possible to go back into full-duplex mode, it will do so automatically. You may experience a soft popping sound when the modem switches duplex modes.   Using the modem   Basic operating controls This chapter provides an overview of basic modem controls and functions and is designed to get you started quickly using your TelePath with X2 technology modem.   AT commands The instructions you use to change the modem’s settings or give it instructions are called AT commands because each command line starts with the letters "AT." If you installed the TelePath with X2 technology yourself and did not use the plug and play feature, you have already used a few AT commands to change some of your modem’s settings. All the AT commands, their default settings, and explanations of their function are listed in the "Command summary." Here are some general facts about AT commands: All commands except A/ and +++ must be preceded by the AT prefix and are executed when you press <Enter>. A command line can contain more than one command and can be up to 40 characters long, not counting the AT, spaces, or carriage return. In a dial string, it counts but doesn’t act on punctuation such as hyphens and parentheses. You can separate commands with spaces. The command line executes after you enter a terminating character, such as a carriage return (ASCII 013). When you have more than one command on a line, you need the AT only at the beginning of the line. Parameters entered for AT and AT& commands (represented as the variable "n" in Appendix A.) must be between 0 and 255. If a command requires a parameter but no parameter is entered, the modem assumes the parameter is zero. A parameter should be within whatever range is specified for its command. If the number is out of range, you get an ERROR message. Parameters entered for S-registers (also represented as the variable "n" in Appendix A) must also be between 0 and 255. Parameters that are out of range do not cause an ERROR message. Communication software loads default values (contained in the initialization string) at initialization. An escape code sequence (usually +++) returns the modem to command mode from data mode. A time delay must occur between the last character transmitted and the first character of the escape code. This delay (called guard time) can be changed by writing a value to register S12 (default is 1 second). The escape code character must occur three times in succession for an escape to be recognized. Type commands in either upper or lower case, not both. Upper case is recommended.   Setting the mode The modem has three modes of operation: voice, data and fax mode. The normal operating mode for the TelePath with X2 technology is data mode. If your fax software is typical, it automatically switches the modem to fax mode when you run the program and resets the modem to data mode when you exit the program. If you think the modem may be in the wrong mode, type: AT+FCLASS? and press <Enter>. The modem returns a "0" to indicate data mode or a "1" to indicate fax mode. To manually switch to data mode, type: AT+FCLASS=0 and press <Enter>. To manually switch to fax mode, type: AT+FCLASS=1 and press <Enter>. When you reset the modem with the ATZ command, toggle the DTR signal, or turn the power off and on, the modem resets to data mode.   Basic operating instructions When you install the TelePath with X2 technology, you can plug a phone into the TO PHONE jack on the back of the modem. If you have the appropriate software, you can use the phone or a microphone to set up your system as an answering machine that automatically detects voice or fax calls. Refer to the software manual for details. Figure 11. Modem jacks If you prefer to use a microphone to record your answering-machine software’s outgoing message rather than the phone, remember that the MIC jack on your TelePath with X2 technology modem requires an electret condenser microphone. You can connect speakers to the LINE OUT jack, but remember that these speakers should not be the ones you use for your sound card or CD-ROM drive.   Voice/data communication   To start a data call from a voice call: First call the other user to establish the parity, number of data bits, and number of stop bits. Then turn the call over to your modem as follows: Without hanging up the phone, have your modem go off hook in Originate mode. Type: ATD and press <Enter>. Be sure the modem is not set to ATX2 or ATX4, or it returns the NO DIAL TONE result code and hangs up. The other party should have the remote modem go off hook in Answer mode. Type the following command to do this: ATA and press <Enter>. Now both of you can hang up your phones. Either device can be the originate or answer modem. It doesn’t matter who made the phone call, bonlineut one modem must enter Originate mode and the other must then enter Answer mode.   Fax operation The TelePath with X2 technology supports ITU-T V.17, which can send and receive faxes at speeds up to 14.4Kbps. Your modem can also send and receive Group 3 faxes. Using your fax modem for facsimile operations requires compatible facsimile software.   Fax mode flow control setting Many facsimile software products use software flow control when the modem is in fax mode. However, we recommend that you set your modem for hardware flow control (&H1) for fax mode. To make things easier, the fax software provided with your modem automatically enables hardware flow control when the modem is in fax mode. However, if you use other fax software, you must enable hardware flow control by entering the AT&H1 command. See "Command summary" for information on the &Hn command.   Troubleshooting This chapter is divided into two sections, problems you may encounter "Before data transfer" and problems you may encounter "During data transfer."   Before data transfer Problem: Your modem doesn’t answer the phone or go off hook to dial a number. Solution: Review your software manual to see what DTR (Data Terminal Ready) operations your software requires. Then use the appropriate AT&D command. Problem: Your modem doesn’t respond OK when you type AT. Solution: Make sure you’re typing in either upper case or lower case letters (not both), and press <Enter>. Make sure your computer is in terminal mode. This is a communications software function. Check to see that your software is set to the correct connection rate and word length (7 bits with or without a parity bit, or 8 bits and no parity). Also make sure your software is set to the correct serial port, as determined in the setup instructions. Review your communications software manual to see what CD (Carrier Detect) operations your software requires. Then use the appropriate AT&C command. Problem: Your screen displays double characters. Solution: Both your modem’s and software’s local echo are on. You can turn your software’s local echo off, or turn the modem’s echo off by sending the modem the ATE0 command. Problem: Your computer reacts as though a data link has been established, but no call has been received. Solution: Review your communications software manual to see what CD (Carrier Detect) operations are required. Use the appropriate AT&C command. Problem: When the modem is in answer mode, the computer acts as if a carriage return was entered, but nothing was typed. Solution: Your software may be misreading the modem’s signals as it sends a carriage return and line feed before and after the RING and CONNECT messages. Send the quiet mode command (ATQ1). Problem: Both modems exchange carrier signals, but fail to establish a communications link. Solution: Make sure you are in the correct mode (data or fax) for the call you are receiving. The modem must be in data mode to receive a data call, and in fax mode to receive a fax call. Make sure that you have set the software to the same word length, parity, and number of stop bits required by the remote computer and, if your modem is dialing out, also make sure that your software is set to a bit (or baud) rate equal to or higher than that of the remote modem. Make sure the modem at the other end of the line is V.34 compatible at 33600, 31200, 28800, 26400, 24000, 21600, 19200 and 16800 bps (bits per second); and/or V.32bis compatible at 14400, 12000, 9600, 7200 and 4800 bps; and/or V.32 compatible at 9600 and 4800 bps; and/or V.22bis compatible at 2400 bps. These are common signaling standards for full duplex dial-up networks in the U.S. Make sure that your modem’s connection rate setting, AT&Nn, is correct for the call. If the connection rate is locked at a speed (AT&N1-AT&N14) different from the calling modem’s, the TelePath with X2 technology hangs up. The factory setting of &N0, variable connection rate, allows the two modems to negotiate the highest possible connection rate. If these steps fail to correct the problem, the connection is poor and the other modem is missing the signals your modem is transmitting. The quality of phone line connections may vary due to conditions in the environment or the phone company’s equipment. Try again, and if you still can’t get through, try calling another modem. If the second modem accepts your call, the problem may lie with the first modem.   During data transfer Problem: The screen displays brackets. Solution: Check to make sure that your communications software is set to the same connection rate as (or higher than) that of the remote modem, and that both your software and the remote system are set to the same word length, parity, and number of stop bits. If the settings are correct, the problem may be with the phone line. Try the following measures: Place the call again. The phone company routes even local calls differently each time you call. Call a different modem. The problem may be with the modem you tried to call. Problem: The screen displays random or garbage characters. Solution: Check to make sure that your communications software is set to the same connection rate as (or higher than) that of the remote modem, and that both your software and the remote system are set to the same word length, parity and number of stop bits. If the settings are correct, the problem may be the phone line. If the modem is set to a fixed serial port rate (AT&B1) and your software is fixed at 38.4K, 57.6K, or 115.2K bps, the reason may be one of the following: If you use TSRs, they may be interfering. Try disabling them before you run your communication software. The same is true of disk-caching programs. Check to see that your software and the modem are set for the same kind of flow control, either hardware or software. Some communications programs also require you to disable the kind of flow control you are not using. Problem: The screen displays double characters. Solution: Your modem’s onlineonline echo is on and the remote computer is also echoing. You may handle this in either of the following ways: Terminate the call, hang up, turn off the onlineonline echo (ATF1) when the modem is in command mode, and call again. (This way you do not lose any data.) Send the escape code, and then send the ATFO command to force the modem into online-command mode. This turns off the online echo and immediately puts the modem back online. (Use this method only if the remote system and modem are not in the middle of a data transfer.)   If you still have problems The problems described above are by far the most common ones that users encounter. If the suggestions don’t clear up your difficulties, try the following: Review the manual carefully to see if you missed something. Contact Customer Support. If it is necessary to return the modem for service, the technician will give you a Return Materials Authorization (RMA) number.   Testing You may use the AT&T command and register S16 (dial test) to test the modem. All loopback testing conforms to ITU-T Recommendation V.54. Only one test can be performed at a time. If you send a test command while the modem is in test mode, you get an ERROR message. The tests supported through the AT&Tn command include analog loopback, digital loopback, and remote digital loopback. You can enter your own data or use the modem’s internal test pattern and error detector. Disable error control before testing. If the modem detects errors and retransmits the affected data, your test results are invalid.   Ending a test AT&T0, S18 Issuing the AT&T0 command terminates a test. Alternatively, set register S18 to a specified number of seconds, for example, S18=10. When the 10 seconds are up, the modem automatically ends the test and returns to command mode. If the test was Analog Loopback (AL), the AT&T0 command hangs up the modem. If the test was digital or remote digital loopback, issue an ATH command to hang up the modem, or an ATZ command to hang up the modem and reset it. If you use the S18 test timer, but in the process of testing you issue an ATZ command, S18 resets to zero and the timer is disabled. Also, you cannot store a value for S18 in nonvolatile memory; its power-on and reset default is always zero.   Analog Loopback—&T1, &T8 This test checks the operation of the modem’s transmitter and receiver. Data flow is shown below. Modem/DTE (Data Terminal Equipment) indicates the modem’s interface with the computer. Figure 12. Internal Loopback Test Diagram You have two analog loopback options. First, &T1 involves typing data that you can verify at your screen. The second option, &T8, is an internal self-test that does not involve the keyboard or screen. It isolates the modem from the computer interface to give you a more specific result.   &T1   To conduct a manual Analog Loopback test: The modem should be on hook in command mode. If you wish, set register S18 as a test timer. For example, insert S18=10 in the following command string before &T1. (Note that strings of commands require only an AT at the beginning.) AT &M0 S18=10 &T1 The modem disables error control, sets the timer, enters analog loopback (AL) mode, and sends a CONNECT message. Type recognizable data so that you can verify it when it is looped back to the screen. End the test. If you set S18, the modem automatically stops the test at the timeout, exits the test mode, and responds OK. If you didn’t set register S18, wait one second and type +++ to end the test and return the modem to command mode. When the modem responds OK, type &T0 to terminate the test mode and hang up the modem. (Typing ATH has the same effect. Typing ATZ also has the same effect, but also resets the modem and restores your &W default.) If the modem sends an ERROR message, you issued an invalid command. If there were no errors, reset the modem to AT&M4, for error control, unless you issued ATZ. If the modem is in online-command mode, that is, still connected to a remote modem, and you send it an AT&T1 or AT&T8 command, it drops the call, enters AL mode, sends a CONNECT result, and waits for loopback characters.   &T8 This Analog Loopback option causes the modem to send an internal test pattern to its transmitter and loop it back to the receiver. An internal error detector counts any errors and, when the test is ended, sends the number of errors or 000 (no errors) to the screen. You don’t type anything during this test, and the modem does not send anything to the screen, so this option verifies only the modem. If you get no errors but your problem continues, it may be at the computer interface.   To conduct an internal Analog Loopback test: The modem should be on hook in command mode. If you wish, set register S18 as a test timer. For example, insert S18=10 in the following command string before &T8. (Note that strings of commands require only on AT at the beginning.) Type: AT &M0 S18=10 &T8 and press Enter. The modem disables error control, sets the timer, and enters Analog Loopback mode. The modem sends its internal test pattern to the transmitter, and loops the pattern back to the receiver. You do not see any data on your screen. End the test. If you set S18, the modem automatically stops the test at the timeout. If you didn’t set register S18, type AT&T0 to end the test. Or use ATH or ATZ. Both end the test and hang up. When the modem hangs up it returns a three-digit code, followed by OK. A code of 000 indicates no errors were found. A code of 255 indicates 255 or more errors. An ERROR message indicates that you issued an invalid command. If there were no errors, reset the modem to AT&M4 for error control unless you issued the ATZ command.   &T2 This option is reserved.   Digital Loopback—&T3 If your modem passes the Analog Loopback test, complete this test to locate problems with a remote modem or the telephone channel. Data flow is shown below. The remote system is pictured on the right. Modem/DTE (Data Terminal Equipment) indicates the modem’s interface with the computer. Figure 13. Digital Loopback Test Diagram   To conduct a digital loopback test: Set the modem to AT&M0 to disable error control. Establish a connection with the remote modem. Bring the modem back to online command mode with the +++ escape code. Then send it the AT&T3 command. The modem enters DL mode. The remote user should type a short message. It is looped back by your modem’s transmitter for verification on the remote screen. You do not see the message or any other data. When the remote user has completed the test, issue the AT&T0 command to end the test. If you wish, return the modem online (ATO) to resume data mode. Or type ATH or ATZ. The latter two commands end the test and hang up the modem. The modem responds OK. If the modem sends an ERROR message, you issued an invalid command.   &T4, &T5 The &T4 option causes the modem to grant a remote modem’s request for a remote digital loopback test. The &T5 option cancels &T4, so the modem refuses to recognize &T4. &T5 is the default so that your modem isn’t subject to another user calling and tying up your modem without your permission.   Remote Digital Loopback—&T6, &T7 This test, like the local digital loopback test, verifies the condition of both modems and the phone link. Data flow is shown below. The remote system is displayed on the right. Modem/DTE (Data Terminal Equipment) indicates the modem’s interface with the computer. Figure 14. Remote Digital Loopback Test Diagram The request for and granting of remote digital loopback testing requires that both modems use ITU-T V.54 standard signaling. The test must be performed at 2400 or 1200 bps. If the remote modem does not have the capability or is not set to respond, you get an ERROR result code. As with analog loopback, you have two remote digital loopback options. If you select &T6, you send keyboard data to the modem and verify it when it is returned over the phone lines and to your screen. If you select &T7, the modem sends its internal test pattern and returns an error count to your screen. &T6   To conduct a manual Remote Digital Loopback test: Set your software to 2400 or 1200 bps. Set the modem to &M0. If you wish, set the S18 timer; i.e. type: AT &M0 S18=10. Establish a connection with the remote modem. If you haven’t already done so, arrange with the remote user to cooperate with your testing. The remote user should set the remote modem to acknowledge the RDL (Remote Digital Loopback) request, for example, AT&T4. Bring the modem back to online-command mode with the +++ escape code. Send it the AT&T6 command. The modem enters RDL mode. Type a short message. It loops back to your modem by the remote modem and to your screen for verification. (The remote user does not see your data.) End the test. If you set register S18, the modem automatically ends the test when the timeout is reached. If you didn’t set S18, type AT&T0 to end the test. If you wish, return the modem online (ATO) to resume data mode, or send either ATH or ATZ. The latter two commands end the test and hang up the modem. The modem responds OK. If you issue an invalid command, the modem sends an ERROR message. Data errors indicate a problem with the remote modem or the phone link. If you have not passed an analog loopback test on your modem, the problem may also be with your modem. Reset the modem to AT&M4 unless you used ATZ.   &T7 This test option causes the modem to send an internal test pattern through the remote digital loopback. An internal error detector counts any errors and, when the test is ended, sends the number of errors or 000 (no errors) to the screen. You don’t need to type anything during this test. The modem sends only its final error count to your screen.   To conduct an internal Remote Digital Loopback test: Set your software to 2400 or 1200 bps. Set the modem to &M0. If you wish, set the S18 timer. Establish a connection with the remote modem. If you haven’t already done so, arrange with the remote user to cooperate with your testing. The remote user should set the remote modem to acknowledge the RDL request, for example, AT&T4. Bring the modem back to online-command mode with the +++ escape code. Then send it the AT&T7 command. The modem enters RDL mode. The modem sends its internal test pattern to the remote modem, which loops it back to your modem. You do not see the data on your screen. End the test. If you set S18, the modem automatically stops the test when the timer times out. If you didn’t set register S18, type AT&T0 to end the test. After you view the test results (see the next paragraph), return the modem online if you wish (ATO) and resume data mode. Or send either ATH or ATZ. The latter two commands end the test and hang up. When you terminate the test, the modem returns a three-digit code, followed by OK. A code of 000 means no errors were found. A code of 255 indicates 255 or more errors. If you issue an invalid command, the modem sends an ERROR message. If you performed an analog loopback and know your modem is working properly, errors indicate a problem with either the phone connection or the remote modem. Reset the modem to AT&M4 unless you sent it the ATZ reset command.   Dial test—S16=2 The dial test is used for factory-testing the frequencies of tone values. When register S16 is set to 2 and a single tone is dialed (for example, ATD7), the modem continues to transmit that tone until you press <Enter> again.   Command summary 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 not 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 but A/ and +++ must begin with the AT prefix and be entered by pressing a carriage return (Enter key). The maximum command length is 60 characters. The modem doesn’t count the AT prefix, carriage returns, or spaces.   Command set Command "n" value Function $ Displays 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 redial. This 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 +++. Use alone to test for OK result code. Bn U.S./ITU-T answer sequence B0 IITU-T V.25 answer sequence B1 U.S. answer tone Dn Dials the specified phone number. Includes the following: P Pulse (rotary) dial T Tone dial , (comma) Two-second pause; linked to S-8 register ; (semicolon) Return to Command mode after dialing ! (exclamation point) Flashes the switch hook / Delays for 125 msec. before proceeding with dial string W Wait for second dial tone (X3 or higher); linked to S6 register @ Dials, waits for quiet answer, and continues (X3 or higher) R Originates call using answer (reverse) frequencies # Extended touch tone pad tones * Extended touch tone pad tones DL Dials the last-dialed number DSn Dials the phone number string stored in NVRAM at position n (n = 0-3). Phone numbers are stored with the &Zn=s command. D$ Displays a list of Dial 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 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 I0 Four-digit product code I1 Results of ROM checksum I2 Results of RAM checksum I3 Product type I4 Current modem settings I5 Nonvolatile memory (NVRAM) settings I6 Link diagnostics I7 Product configuration I11 Link diagnostics Ln Controls speaker volume (internals only) L0 Low L1 Low L2 Medium L3 High Mn Operates speaker M0 Speaker always OFF M2 Speaker always ON M3 Speaker ON after dial, until CONNECT On Returns online O0 Returns online O1 Returns online and retrains P Sets pulse dial (for phone lines that don’t support touch-tone dialing) Qn Displays/suppresses result codes Q0 Displays result codes Q1 Quiet mode; no result codes Q2 Displays result codes only in Originate mode Sr.b=n Sets bit .b of register r to n (0/OFF or 1/ON) Sr=n Sets register r to n Sn? Displays contents of S-Register n S$ Displays a list of the S-Registers T Sets tone dial Vn Displays verbal/numeric result codes V0 Numeric codes V1 Verbal codes Xn Sets result code displayed and some dialing options. Default is X4. See "Xn Settings."   Xn settings Result Codes n=0 n=1 n=2 n=3 n=4 0/OK x x x x x 1/CONNECT x x x x x 2/RING x x x x x 3/NO CARRIER x x x x x 4/ERROR x x x x x 5/CONNECT 1200 x x x x x 6/NO DIAL TONE x x 7/BUSY x x 8/NO ANSWER* x x 10/CONNECT 2400 x x x x 13/CONNECT 9600 x x x x 18/CONNECT 4800 x x x x 20/CONNECT 7200 x x x x 21/CONNECT 12000 x x x 25/CONNECT 14400 x x x 43/CONNECT 16800 x x x x 85/CONNECT 19200 x x x x 91/CONNECT 21600 x x x x 99/CONNECT 26400 x x x x 103/CONNECT 16800 x x x x 107/CONNECT 28800 x x x x 151/CONNECT 31200 x x x x 155/CONNECT 33600 x x x x 170/RING A x x x x 171/RING B x x x x 172/RING C x x x x 173/RING D x x x x 180/CONNECT 33333 x x x x 184/CONNECT 37333 x x x x 188/CONNECT 41333 x x x x 192/CONNECT 42666 x x x x 196/CONNECT 44000 x x x x 200/CONNECT 45333 x x x x 204/CONNECT 46666 x x x x 208/CONNECT 48000 x x x x 212/CONNECT 49333 x x x x 216/CONNECT 50666 x x x x 220/CONNECT 52000 x x x x 224/CONNECT 53333 x x x x 228/CONNECT 54666 x x x x 232/CONNECT 56000 x x x x 236/CONNECT 57333 x x x x Functions Adaptive Dialing x x x Wait for 2nd Dial Tone (W) x x Wait for Answer (@) x x Fast Dial x x Command "n" value Function Yn Selects power-on/reset default configuration Y0 Default is profile 0 setting in NVRAM Y1 Default is profile 1 setting in NVRAM Y2 Generic Template (&F0) Y3 Hardware Flow Control (&F1) Y4 Software Flow Control (&F2) Zn Resets modem Z0 Resets modem to NVRAM profile selected by Y command Z1 Resets modem to NVRAM profile 0 Z2 Resets modem to NVRAM profile 1 Z3 Resets modem to factory default profile 0 (&F0) Z4 Resets modem to factory default profile 1 (&F1) Z5 Resets modem to factory default profile 2 (&F2) &$ Displays a list of ampersand (&) commands &An Enable or suppress the display of an additional result code subsets. If the modem is set to X0 and the connection rate is from 1200bps to 33.6Kbps, result code 14 is displayed. Other result codes indicate the connection and require a setting of X1 or higher. &A0 Do not display ARQ result codes. This setting pertains only to the display of codes and not to ARQ function. &A1 Display ARQ result codes &A2 Display modulation indicators (V.32, VFC or V.34). If your software cannot handle the added modulation, select &A1 or &A0. &A3 Default. Display error control (LAPM, MNP, SYNC or NONE) and data compression type (V.42BIS/MNP5). In the following example, the devices negotiated error control for the call (ARQ), used V.34 modulation, are using the LAPM error control protocol, and are using V.42bis compression: CONNECT 28800/ARQ/V34/LAPM/V42BIS. &Bn Sets modem’s serial port rate &B0 Variable, follows connection rate &B1 Fixed serial port rate &B2 Fixed in ARQ mode, variable in non-ARQ mode &Cn Controls Carrier Detect (CD) signal &C0 CD override &C1 Normal CD operations &Dn Controls Data Terminal Ready (DTR) operations &D0 DTR override &D1 DTR toggle causes online Command mode &D2 Normal DTR operations &Fn Loads a read-only (non-programmable) factory configuration &F0 Generic template &F1 Hardware flow control template &F2 Software flow control template &Gn Sets Guard Tone &G0 No guard tone, U.S. and Canada &G1 550Hz guard tone, some European countries, requires B0 setting &G2 1800Hz guard tone, U.K., requires B0 setting &Hn Sets Transmit Data (TD) flow control &H0 Flow control disabled &H1 Hardware flow control, Clear to Send (CTS) &H2 Software flow control, XON/XOFF &H3 Hardware and software flow control &In Sets Receive Data (RD) software flow control (see also &Rn) &I0 Software flow control disabled &I1 XON/XOFF signals to your modem and remote system &I2 XON/XOFF signals to your modem only &Kn Enables/disables data compression &K0 Data compression disabled &K1 Auto enable/disable &K2 Data compression enabled &K3 MNP5 compression disabled &Mn Sets Error Control (ARQ) 1200bps 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 established at this speed, the modem will hang up. &N0 Variable rate &N1 300 bps &N2 1200 bps &N3 2400 bps &N4 4800 bps &N5 &N6 9600 bps &N7 12,000 bps &N8 14,400 bps &N9 16,800 bps &N10 19,200 bps &N11 21,600 bps &N12 24,000 bps &N13 26,400 bps &N14 28,800 bps &N15 31,200 bps &N16 33,600 bps &N17 33,333 bps &N18 37,333 bps &N19 41,333 bps &N20 42,666 bps &N21 44,000 bps &N22 45,333 bps &N23 46,666 bps &N24 48,000 bps &N25 49,333 bps &N26 50,666 bps &N27 52,000 bps &N28 53,333 bps &N29 56,000 bps &N30 57,333 bps &Pn Sets pulse (rotary) dial make/break ratio &P0 U.S./Canada ratio, 39%/61% &P1 U.K ratio, 33%/67% &Rn Sets Receive Data (RD) hardware flow control, Request to Send (RTS) (see also In) &R0 &R1 Ignore ATS &R2 RX to DTE/RTS high &Sn Controls Data Set Ready (DSR) operations &S0 DSR override; always ON &S1 Modem controls DSR &Tn Begins test modes &T0 Ends testing &T1 Initiates Analog Loopback &T2 Reserved &T3 Initiates Local Digital Loopback &T4 Enables Remote Digital Loopback &T5 Prohibits Remote Digital Loopback &T6 Initiates Remote Digital Loopback &T7 Initiates Remote Digital with self-test and error detector &T8 Initiates Analog Loopback with self-test and error detector &Un Sets floor connect speed when &Un is set greater than 0. &Nn is the ceiling connect speed. See &Nn. &U0 Disabled &U1 300 bps &U2 1200 bps &U3 2400 bps &U4 4800 bps &U5 7200 bps &U6 9600 bps &U7 12,000 bps &U8 14,400 bps &U9 16,800 bps &U10 19,200 bps &U11 21,600 bps &U12 24,000 bps &U13 26,400 bps &U14 28,800 bps &U15 31,200 bps &U16 33,600 bps &U17 33,333 bps &U18 37,333 bps &U19 41,333 bps &U20 42,666 bps &U21 44,000 bps &U22 45,333 bps &U23 46,666 bps &U24 48,000 bps &U25 49,333 bps &U26 50,666 bps &U27 52,000 bps &U28 53,333 bps &U29 56,000 bps &U30 57,333 bps &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 Reserved &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) &Zn? Displays the phone number stored at position n (n = 0-3) &ZL? Displays the last executed dial string <Ctrl>C Cancels the display of the help screens <Ctrl>K Cancels the display of the help screens <Ctrl>S Stops/restarts help screens +++ Escapes to online-command mode   Voice commands Command "n" value Function #CLSn Selects Data, Fax, or Voice Mode #CLS? Displays current setting #CLS=0 Data Mode #CLS=1 Class 1 Fax #CLS=2 Class 2.0 Fax #CLS=8 Voice Mode. In this mode, the following commands can be requested: #VRX Receives voice file from line, microphone, or handset. #VTX Transmits voice file to line, speaker, or handset. #VLS=n Voice Line Select #VLS? Displays current setting #VLS=0 Telephone Line #VLS=1 Handset #VLS=2 Speaker #VLS=3 Microphone #VLS=4 Telephone Line/Handset #CID=n Caller ID #CID? Displays current setting #CID=0 Disables Caller ID reporting #CID=1 Enables formatted Caller ID reporting #CID=2 Enables unformatted Caller ID   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. S-Register values marked with an asterisk (*) are saved in NVRAM. Register Default Function *S0 1 Sets the number of rings on which to answer in Auto AnswerMode. When set to 0, Auto Answer is disabled. S1 0 Counts and stores the number of rings from an incoming call (read only) *S2 43 Stores the ASCII decimal code for the escape code character. Default character is +. *S3 13 Stores the ASCII code for the Carriage Return character *S4 10 Stores the ASCII decimal code for the Line Feed character *S5 8 Stores the ASCII decimal code for the Backspace character *S6 2 Sets the number of seconds the modem waits for dial tone before dialing *S7 60 Sets the number of seconds the modem waits for a carrier or answers before returning on-hook and sending a No Carrier result code *S8 2 Sets the duration, in seconds, for the pause (,) option in the Dial command *S9 6 Sets the required duration, in tenths of a second, of the remote modem’s carrier signal before recognition by your modem *S10 7 Sets the duration, in tenths of a second, that the modem waits after loss of carrier before hanging up. This guard time allows the modem to distinguish between a line hit, or other disturbances that momentarily break the connection, from a true disconnect (hang up) by the remote modem.While we don’t recommend connecting the modem to a line with call waiting, if you have it, you may wish to adjust this setting upward to prevent the modem from misinterpreting the second call signal as a disconnect by the remote modem. A better alternative is to ask your phone company how to temporarily disable call waiting (usually *70W). *S11 70 Sets the duration and spacing, in milliseconds for tone dialing *S12 50 Sets the duration, in fiftieths of a second, of the guard time for the escape code sequence (+++) *S13 0 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 Do DSO on DTR 4 / 16 Do DSO on reset 5 /32 Disable V.32bis ASL mode 6 / 64 Disable Quick Retrains 7 / 128 Disconnect on escape code S14 0 Reserved *S15 0 ARQ Options register. To set the register see the instructions for S13. Bit / Value Result 0 / 1 Disable ARQ/MNP for V.22 1 / 2 Disable ARQ/MNP for V.22bis 2 / 4 Disable ARQ/MNP for V.32/V.32bis 3 / 8 Disable MNP handshake 4 /16 Disable MNP level 4 5 / 32 Disable MNP level 3 6 / 64 Special MNP incompatibility 7 / 128 Disable V.42 operation S16 0 Bit-mapped test register Bit / Value Result 1 /2 Touch Tone Test 2 / 4 Use internal test pattern 7 / 128 Watchdog reset S17 0 Reserved S18 0 Test timer for &Tn 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. S20 0 Reserved *S21 10 Sets the length, in 10-millisecond units, of breaks sent from the modem to the computer; applies to ARQ mode only *S22 17 Stores the ASCII decimal code for the XON character. Range is 0-127. *S23 19 Stores the ASCII decimal code for the XOFF character. Range is 0-127. *S24 0 Reserved *S25 20 Sets the duration, in hundredths of a second, that DTR must be dropped so that the modem doesnít interpret a random glitch as a DTR loss. Most users will want to use the default; this register is useful for setting compatibility with older systems running under older operating software. *S26 0 Reserved *S27 1 Connections bit-mapped register. To set the register see the 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 European calls, but only originates V.21 calls 1 / 2 Enables unencoded (non-trellis coded) modulation in V.32bis mode; rarely used part of the ITU-T V.32bis recommendation 2 / 4 Disables V.32 modulation 3 / 8 Disables 2100Hz answer tone to allow two V.42 modems to connect more quickly 4 /16 Enables V.23 fallback mode 5 / 32 Disables V.32bis mode 6 / 64 Reserved 7 / 128 Software compatibility mode. This setting disables the codes and displays the 9600 code instead. The actual rate of the call can be viewed on the ATI6 screen. Used for unusual software incompatibilities. Some software may not accept 7200, 12000 and 14400 bps result codes. *S28 0 Eliminates the V.32 answer tones for a faster connection 8 Default value, in tenths of a second 255 Disables all connections except V.32 at 9600 bps *S29 20 Sets the duration, in tenths of a second, of the V.21/V.23 answer mode fallback timer *S30 0 Reserved *S31 128 Voice playback audio level; range is 0-255 *S32 16 Bitmapped Bit / Value Result 0 / 1 V.8 Call Indicate enable 1 / 2 Enable V.8 mode 2 / 4 Disable V.FC modulation 3 / 8 Disable V.34 modulation 4 /16 Disable 33.6 support 5 / 32 Disable X2 6 / 64 Reserved 7 / 128 Reserved *S33 0 Bitmapped Bit / Value Result 0 / 1 Disable 2400 Symbol rate 1 / 2 Disable 2743 Symbol rate 2 / 4 Disable 2800 Symbol rate 3 / 8 Disable 3000 Symbol rate 4 /16 Disable 3200 Symbol rate 5 / 32 Disable 3429 Symbol rate 6 / 64 Reserved 7 / 128 Disable Shaping *S34 0 Bitmapped Bit / Value Result 0 / 1 Disable 8S-2D trellis encoding 1 / 2 Disable 16S-4D trellis encoding 2 / 4 Disable 32S-2D trellis encoding 3 / 8 Disable 64S-4D trellis encoding 4 /16 Disable Non-linear coding 5 / 32 Disable TX level deviation 6 / 64 Disable Pre-emphasis 7 / 128 Disable Pre-coding *S35 0 Reserved S36 14 Reserved S37 0 Reserved *S38 0 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. Default 0: 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. *S41 0 Bitmapped Bit 0 / Value Result 0 / 0 Distinctive Ringing Disabled 1 / 1 Dinstinctive Ringing Enabled Bits 2,1 / Value Result 00 / 0 Full-Duplex Speakerphone Mode 01 / 2 Half-Duplex Speakerphone Mode Bits 7 to 3 Reserved Note: If the TelePath with X2 technology is set to X0 and the connection is at any rate from 1200bps to 33.6Kbps, Result code 14 is displayed. The other result codes indicate the connection and require a setting of X1 or higher. If your software cannot handle the added modulation information, select &A1 or &A0. When &N is used in conjunction with &U, &N sets the highest speed at which your modem will connect, and &U sets the lowest speed at which the modems will connect. The factory default settings for these values should be sufficient for most users. Refer to the EIA/TIA IS-101 document, "Voice Control Interim Standard" for additional information on voice commands; or contact Global Engineering Documents: 1-800-854-7179. Type file transfer protocols without using flow control. The 128-byte option lets remote users with slower modems stop data you’re sending from scrolling off their screens. When remote users send your computer an XOFF (Ctrl-S) and you stop transmitting, the data in transit from your modem’s buffer doesn’t exceed the size of their screen. This is also very helpful in situations when a remote modem/printer application is losing characters.   Notices   All Rights Reserved This publication is protected by copyright and all rights are reserved. No part of it may be reproduced or transmitted by any means or in any form, without prior consent in writing from Gateway 2000. The information in this manual has been carefully checked and is believed to be accurate. However, Gateway 2000 assumes no responsibility for any inaccuracies that may be contained in this manual. In no event will Gateway 2000 be liable for direct, indirect, special, exemplary, incidental, or consequential damages resulting from any defect or omission in this manual, even if advised of the possibility of such damages. In the interest of continued product development, Gateway 2000 reserves the right to make improvements in this manual and the products it describes at any time, without notice or obligation.   Trademark Acknowledgments AnyKey, cow spot motif, CrystalScan, Destination, Field Mouse, Gateway 2000, GW2K, HandBook, TelePath, Vivitron, stylized "G" design, and motto "You’ve got a friend in the business" are registered trademarks and EZ Pad, Family PC, and Gateway Solo are trademarks of Gateway 2000, Inc. Intel, Intel Inside logo, and Pentium are registered trademarks and MMX is a trademark of Intel Corporation. Microsoft, MS, MS-DOS, and Windows are trademarks or registered trademarks of Microsoft Corporation. All other product names mentioned herein are used for identification purposes only, and may be the trademarks or registered trademarks of their respective companies. Copyright © 1997 Gateway 2000, Inc. 610 Gateway Drive, N. Sioux City, SD 57049 USA Regulatory Compliance Statements American Users: This device has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio or television reception. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio and television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: • Reorient or relocate the receiving antenna • Increase the separation between the equipment and receiver • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected • Consult the dealer or an experienced radio/TV technician for help. Warning! Change of modifications not expressly approved by the manufacturer could void the user’s authority to operate the equipment. Canadian Users: This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of Industry Canada. Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de Classe B prescrites dans le règlement sur le brouillage radioélectrique édicté par Industrie Canada. Caution! Disconnect power before servicing. Attention! Couper le courant avant l’entretien.