U.S. Robotics ® Modems: User’s Guide http://www.usr.
U.S. Robotics Corporation 3800 Golf Rd. Rolling Meadows, IL 60008 Copyright © 2000 U.S. Robotics Corporation. All rights reserved. No part of this documentation may be reproduced in any form or by any means or used to make any derivative work (such as translation, transformation, or adaptation) without written permission from U.S. Robotics Corporation. U.S.
CONTENTS 1 56K FAX MODEM P RODUCT FEATURES Modulation Schemes 1 Error Control and Data Compression Schemes 2 Fax Modulation Schemes 2 Front Channel Link Rates (download) (V.90/V.92) 2 Back Channel Link Rates (upload) (V.92) 2 Back Channel Link Rates (upload) (V.90) 2 V.34+ Link Rates 2 V.
Uninstalling an External Faxmodem 9 Uninstalling a Macintosh Faxmodem 9 4 TROUBLESHOOTING AND H ELP RESOURCES External Serial Modems 11 Basic Troubleshooting Steps 11 My computer isn't recognizing my modem. 12 My software isn't recognizing my modem. 14 My modem won't dial out or doesn't answer incoming calls. 15 Office Users 16 Dialing Problems for Voice Mail Users 16 My modem sounds like it's trying to connect to another modem but fails. 16 My modem isn't achieving a 56K Internet connection.
Basic Troubleshooting Steps 30 My computer isn’t recognizing my modem. 30 My software isn’t recognizing my modem. 31 My modem won’t dial out or doesn’t answer incoming calls. 33 Office Users 33 Voice Mail Users 33 My modem sounds like it’s trying to connect to another modem but fails. 33 My modem isn’t achieving a 56K Internet connection. 34 Internal ISA Modems 35 Basic Troubleshooting Steps 35 My computer isn’t recognizing my modem. 35 My software isn’t recognizing my modem.
In Canada: 49 5 G LOSSARY 6 TECHNICAL R EFERENCE Front-of-the-Case Lights (External Serial Faxmodems) 63 Top-of-the-Case Lights (Voice Faxmodem Pro Externals) 64 Typing Commands 64 Basic Data Commands 64 Extended Data Commands 71 S Registers 80 Bit-Mapped Registers 84 7 R EGULATORY INFORMATION Manufacturer's Declaration of Conformity 89 Tested to comply with FCC Standards for Home and Office Use.
1 Modulation Schemes 56K FAXMODEM PRODUCT FEATURES ITU-T V.92s ITU-T V.90* x2TM 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.
2 CHAPTER 1: 56K FAXM ODEM P RODU CT F EA TURES Error Control and Data Compression Schemes ITU-T V.42 ITU-T V.42bis MNP 2-5 Fax Modulation Schemes ITU-T V.17 ITU-T V.29 ITU-T V.27ter ITU-T V.21 Fax Standards EIA 578 Class 1 FAX EIA 592 Class 2.0 FAX Front Channel Link Rates (download) (V.90/V.92) 28000, 29333, 30666, 32000, 33333, 34666, 36000, 37333, 38666, 40000, 41333, 42666, 44000, 45333, 46666, 48000, 49333, 50666, 52000, 53333, 54666, 56000 Back Channel Link Rates (upload) (V.
V.32bis Link Rates V.32bis Link Rates 4800, 7200, 9600, 12000, 14400 Additional Link Rates 300, 1200/75 (V.
4 CHAPTER 1: 56K FAXM ODEM P RODU CT F EA TURES
2 Making a Speakerphone Call with a Telephone INTERNAL AND EXTERNAL MODEMS WITH SPEAKERPHONE External Modems with Speakerphone 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.
6 CHAPTER 2: IN TER NAL AN D E XTERN AL MOD EM S WITH SPEA KER PHONE If you do not hear your phone ring, you may not have the telephone's cord plugged into the modem's 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. Internal Modems with Speakerphone See your modem’s communications software manual for instructions.
3 UNINSTALLING A U.S. ROBOTICS® MODEM NOTE: These instructions only apply to current U.S. Robotics modems. If the modem you'll be uninstalling was made by another manufacturer, refer to that modem's documentation for instructions. This chapter covers the uninstallation of: Uninstalling a Winmodem modem ■ A U.S. Robotics Winmodem® modem. ■ A U.S. Robotics Internal Faxmodem. ■ A U.S. Robotics External Faxmodem. ■ A U.S. Robotics Macintosh Faxmodem.
8 CHAPTER 3: UNIN STA LLIN G A U.S. ROBOTIC S ® MOD EM 8 Shut down Windows and turn off your computer. 9 Remove the phone cords from the modem's TELCO and PHONE jacks. If the modem is a voice modem, remove any microphones or powered speakers attached to the modem. CAUTION: To avoid the risk of electric shock, make sure your computer and all peripheral devices are turned off and unplugged. 10 Remove the computer's cover. (If you do not know how to do this, refer to your computer's documentation.
Uninstalling an External Faxmodem 9 9 Remove the screw that attaches the modem's metal bracket to the computer. 10 Remove the modem from its slot. 11 Replace the computer's cover. Your modem has now been completely uninstalled. Uninstalling an External Faxmodem 1. First remove the modem from the Windows operating system. From the Start menu, point to Settings and then click Control Panel. 2. Double-click the System icon. 3. Click the Device Manager tab. 4. Double-click the Modems icon. 5.
10 CHAPTER 3: UNIN STA LLIN G A U.S.
4 TROUBLESHOOTING RESOURCES AND HELP This chapter covers: ■ External Serial Modems ■ External USB Modems ■ Macintosh Modems ■ Internal Winmodem® modems ■ Internal ISA Modems ■ Internal PCI Modems ■ Help Resources ■ Are You Still Having Problems? ■ If You Need to Return the Modem to U.S. Robotics for Repair External Serial Modems Basic Troubleshooting Steps 1.
12 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES with this modem. Depending on whether you have a 9-pin or 25-pin serial port on your computer, you will need either a DB9/DB25 or a DB25/DB25 serial cable. See the diagrams below. You need a DB9F/DB25M RS-232 serial cable. You need a DB25F/DB25M RS-232 serial cable. 4. If there are DIP switches on the back of your modem, are they set correctly? DIP switches 3, 5, and 8 should be in the down position. See the diagram below for the correct settings. 5.
External Serial Modems 13 tab. Look for another modem already in the machine. If there is another modem listed, check which COM port it is using. If a previous modem is already using the available COM port, you can either use another COM port or uninstall the previously installed modem. See your previous modem's manual for uninstallation instructions. Next make sure that your COM Ports are configured correctly. Right-click the My Computer icon on your desktop. Click Properties. Click the Hardware tab.
14 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES Windows NT Click Windows Start, Settings, and then Control Panel. Double-click Ports. Make sure the port you are plugging the modem into appears in the list. If it does not, the port needs to be added, and possibly enabled in the BIOS. Consult your Windows NT manual for information about adding ports. After you add or enable the port, follow the instructions on the front of the Installation Guide that came with your modem to install your modem.
External Serial Modems 15 your modem is not properly installed. Try reinstalling your modem using the instructions on the Installation Guide. Windows 95/98/NT You may not have the correct modem type selected in your software or in Windows. Click on Windows Start, Settings, and Control Panel. When Control Panel opens, click Modems. Here you will see a list of installed modems. You can also add, remove, or view the properties of modems from this window. The U.S.
16 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES Possible solution: You might have a bad phone cord connection to your modem, or your phone cord may be plugged into the wrong jack. The phone cord should be plugged into the jack labelled on the modem and into the wall phone jack. Use the phone cord included in your modem's box if possible. Possible solution: You may have devices between the modem and the phone jack.
External Serial Modems My modem isn't achieving a 56K Internet connection. 17 Possible solution: Our research has shown that the vast majority of telephone lines in North America can and do support V.90/V.92 connections. The V.90/V.92 protocol allows for connection speeds of up to 56K, but line conditions may affect the actual speeds during a given connection. Due to unusual telephone line configurations, some users will not be able to take full advantage of V.90/V.92 technology at this time.
18 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES 4. For a V.92 connection, your modem must be connecting to a V.92 server. A pair of 56K modems will not connect to each other at V.92/56K speeds. Note: Current IC/FCC regulations limiting power may limit maximum download speeds to 53,333 bps. External USB Modems Basic Troubleshooting Steps 1. Is your modem turned on? When your modem is properly connected to power and is turned on, the Power light on the front panel will be on. 2.
External USB Modems 19 You need a DB25F/DB25M RS-232 serial cable. USB A to B cable NOTE: You should NOT attempt to connect or use your modem with both the USB and serial cable connected at the same time. Your modem may fail to respond. If this occurs, you must power down your computer, disconnect the cable you are not using, and restart your system. 4. Is your phone cord properly connected? The phone cord should be plugged into the jack labelled on the modem and into the wall phone jack.
20 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES such as a Null Modem cable, that will not work correctly with this modem. If You Are Using This Modem as a USB Device Possible solution: Your USB port may not be enabled. To ensure USB is enabled on your system, click Windows Start. Then click Settings and then Control Panel. Click the System icon. Next click the Device Manager tab. If your USB is enabled, there will be a USB icon and the words “Universal serial bus controller” under the Computer icon.
External USB Modems 21 Possible solution: If the modem has worked previously and you removed the USB cable from the computer and then reattached it, try another USB port. It may have been set up originally on the other USB port. You should notice some minimal activity from your computer such as hard disk activity or an hour glass icon for a few seconds when you insert or remove a USB cable from the computer or the USB device.
22 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES COM Ports have yellow exclamation points or red Xs over them, your COM ports may be configured incorrectly or are disabled. If this is the case, you may need to contact your computer manufacturer. Windows NT Click Windows Start, Settings, and then Control Panel. Double-click Ports. Make sure the port you are plugging the modem into appears in the list. If it does not, the port needs to be added and possibly enabled in the BIOS.
External USB Modems 23 your modem is not properly installed. Try reinstalling your modem using the instructions on the Installation Guide. Windows 95/98/NT You may not have the correct modem type selected in your software or in Windows. Click on Windows Start, Settings, and Control Panel. When Control Panel opens, click Modems. Here you will see a list of installed modems. You can also add, remove, or view the properties of modems from this window. The U.S.
24 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES be plugged into the jack labelled on the modem and into the wall phone jack. Use the phone cord included in your modem's box if possible. Possible solution: You may have devices between the modem and the phone jack. There should be no line splitters, fax machines, or other devices between the modem and the wall jack. Office Users Possible solution: You may have plugged your modem's phone cord into a digital line, which can damage your modem.
Macintosh Modems 25 configurations, some users will not be able to take full advantage of V.90 technology at this time. In order to achieve a V.90 connection, the following must occur: 1 The server you're dialing in to must support and provide a digital V.90 signal. Your ISP can provide you with a list of dial-up connections and information on what those connections currently support.
26 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES panel will be on. If they are not, check your outlet with another electrical device to be sure you are getting power. 3. If there are DIP switches on the back of your modem, are they set correctly? DIP switches 1, 3, 5, and 8 should be in the down position. See the following diagram for the correct settings. 4. Is your phone cord properly connected? The phone cord should be plugged into the jack labelled on the modem and into the wall phone jack.
Macintosh Modems 27 modem. Make sure it is connected to the modem port on the back of your computer and not the printer port. My software isn't recognizing my modem. Possible solution: Your communications software may not function properly if you have more than one version of the software installed, you are using an older version, or you have more than one communications software installed on your system.
28 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES phone jack. Use the phone cord included in your modem's box if possible. Possible solution: You may have devices between the modem and the phone jack. There should be no line splitters, fax machines, or other devices between the modem and the wall jack. Office Users Possible solution: You may have plugged your modem's phone cord into a digital line, which can damage your modem.
Macintosh Modems My modem isn’t achieving a 56K Internet connection. 29 Possible solution: Note: U.S. Robotics 56K modems are capable of receiving downloads at up to 56 Kbps and sending at 31.2 Kbps. Actual download speeds you experience may be lower due to varying line conditions. Maximum download speeds in U.S. and Canada are limited to 53K, due to regulatory limits on power output. Our research has shown that the vast majority of telephone lines in North America can and do support 56K installation.
30 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES Internal Winmodem® Modems (Model Numbers 3CP5699A, 3CPxx5699A, 3CP5695, 3CPxx5695, and 3CPxx2884A) Basic Troubleshooting Steps 1. Make sure that your phone cord is properly connected. Remove the phone cord from the modem and wall jacks. Reinsert the cord securely in the wall jack and the modem’s jack labelled . Use the phone cord included with your modem, if possible. 2. Make sure that your modem is physically installed correctly in your computer.
Internal Winmodem® Modems 31 Manager button. Look under Ports (COM & LPT). If the COM Ports have yellow exclamation points or red Xs over them, your COM ports may be configured incorrectly. If this is the case, you may need to contact your computer manufacturer. Possible solution: Windows 95 or 98 Your modem will locate a free IRQ to install itself. For a proper installation, one of these IRQs will have to be free before you install your modem.
32 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES on your system. We highly recommend using the communications software provided with your modem either on the Installation CD-ROM or the ConnectionsTM CD-ROM. Possible solution: Check in your software manual or with the software manufacturer to make sure that your software is completely Windows-based. The Winmodem modem does not work with DOS components of any software. Possible solution: Your software’s port settings may be incorrect.
Internal Winmodem® Modems 33 Try reinstalling your modem using the instructions on the Installation Guide. My modem won’t dial out or doesn’t answer incoming calls. For both Dialing and Answering Problems Possible solution: You may have a bad phone cord connection to your modem, or your phone cord may be plugged into the wrong jack. The phone cord should be plugged into the jack labelled on the modem and into the wall phone jack. Use the phone cord included in your modem’s box if possible.
34 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES My modem isn’t achieving a 56K Internet connection. Possible solution: Note: U.S. Robotics 56K modems are capable of receiving downloads at up to 56 Kbps and sending at 31.2 Kbps. Actual download speeds you experience may be lower due to varying line conditions. Maximum download speeds in U.S. and Canada are limited to 53K, due to regulatory limits on power output.
Internal ISA Modems 35 Internal ISA Modems Basic Troubleshooting Steps 1. Make sure that your phone cord is properly connected. Remove the phone cord from the modem and wall jacks. Reinsert the cord securely in the wall jack and the modem’s jack labelled . Use the phone cord included with your modem, if possible. 2. Make sure that your modem is physically installed correctly in your computer. With your computer off, remove the modem and reinstall it in another slot if possible.
36 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES If Windows still fails to recognize your modem and it does not have a yellow exclamation point next to its IRQ, or if your modem doesn’t appear in the list, another problem exists, and you may need to call 3Com Technical Support. Windows 95/98 If you set your modem’s jumpers to Plug-and-Play mode, Windows should locate a free IRQ, if one exists, for your use by your modem.
Internal ISA Modems 37 Possible solution: You may be using a COM port address that is either already in use or not configured correctly. To work properly, this modem needs to be assigned to a free COM port. Windows 2000 Make sure your COM port is not already in use by another modem. Click Windows Start, Settings, and Control Panel, and then double-click Phone and Modem Options. Click the Modems tab. Look for another modem already in the machine.
38 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES My software isn’t recognizing my modem. Possible solution: Your communications software may not function properly if you have more than one version of the software installed, you are using an older version, or you have more than one communications software installed on your system. We highly recommend using the communications software provided with your modem on the Installation CD-ROM. Possible solution: Your software’s port settings may be incorrect.
Internal ISA Modems 39 Possible solution: Windows 2000 If you are using Dial-Up Networking, it may not be configured correctly. Check your configuration and make sure you have the correct port selected. Click Start, point to Settings and click Network and Dial-up Connections. Make sure that the description in the “Connect Using” box (under the General tab) matches the description of the modem you are using. If it doesn't match, select the proper modem description.
40 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES Voice Mail Users Possible solution: If you have voice mail provided by your local phone company, your dial tone may be altered when messages are waiting. Retrieve your voice mail to restore your normal dial tone. My modem sounds like it's trying to connect to another modem but fails. Possible solution: My modem isn't achieving a 56K Internet connection. Possible solution: You may have a poor connection.
Internal PCI Modems 41 should try making your 56K connection several times. One way to test this is to dial into a long distance location. Long distance lines are often much clearer than local lines. It is important to note that telephone companies are constantly upgrading their systems. Lines that do not support 56K today may support 56K in the near future. 3. Your modem must be connecting to a V.90/56K server. A pair of 56K modems will not connect to each other at V.90/56K speeds.
42 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES Locate your modem in the list of devices. If a yellow exclamation point appears over the modem’s description, your modem is in conflict with another device. Either your modem or the other device will have to be reinstalled to another IRQ in order to resolve your conflict. If a usable, free IRQ does not exist, you may need to remove, disable, or relocate another device.
Internal PCI Modems 43 an IRQ for use by your modem. Refer to that device's documentation for more information about removing, disabling, or relocating it. Possible solution: You may be using a COM port address that is either already in use or not configured correctly. To work properly, this modem needs to be assigned to a free COM port. Windows 2000 Make sure your COM port is not already in use by another modem.
44 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES COM ports may be configured incorrectly. If this is the case, you may need to contact your computer manufacturer. Windows NT Turn off your computer and remove your modem. Restart and click Windows Start, Settings, and then Control Panel. Double-click the Ports icon. Your modem must be set to a COM port setting that does not appear in this list. My software isn't recognizing my modem.
Internal PCI Modems 45 the properties of modems from this window. The U.S. Robotics modem you have installed should be present in the list of installed modems. If none of the modem descriptions in the list matches your U.S. Robotics modem or no modems are listed, your modem is not properly installed. Try reinstalling your modem using the instructions on the Installation Guide. Possible solution: Windows 2000 If you are using Dial-Up Networking, it may not be configured correctly.
46 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES Office Users Possible solution: You may have plugged your modem's phone cord into a digital line. Contact your phone system administrator if you are unsure whether or not your phone line is digital. If your phone system requires dialing “9” to access an outside line, be sure to add “9” before the number you are dialing.
Help Resources 47 analog-to-digital conversion. The 56K signal from your ISP begins as a digital signal. Somewhere between the ISP and your modem, there will be an analog-to-digital signal conversion so that your modem can receive the data. There must be no more than one analog-to-digital signal conversion in the path from your ISP to your modem. If more than one analog-to-digital conversion occurs, your connect speeds will default to V.34 (33.6).
48 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES Are You Still Having Problems? 1 Review this manual. 2 Call or visit your modem dealer. Your dealer may be able to provide immediate assistance. 3 If your dealer can't help you, contact U.S. Robotics Customer Support. When you call, specify your modem serial number (found on the modem and on the outside of the box), the model number, and the software being used. The model number is located on the outside of the box.
Are You Still Having Problems? 49 Keating Technologies (905) 479 0231 8:00 am - 8:00 pm EST Monday - Friday If You Need to Return the Modem to U.S. Robotics for Repair Contact U.S. Robotics Customer Support. If the support representative determines that you need to return the modem for repair or replacement, you will receive a SRO (Service Repair Order) number. You must have a SRO number before returning the modem to us.
50 CHAPTER 4: TROUB LESHOOTING A ND HELP RESOU RCES
5 GLOSSARY analog loopback A modem self-test in which data from the keyboard or an internal test pattern is sent to the modem's transmitter, turned into analog form, looped back to the receiver, and converted back into digital form. analog signals A variety of signals and wavelengths that can be transmitted over communications lines such as the sound of a voice over the phone line. answer mode The mode used by your modem when answering an incoming call from an originating modem.
52 CHAPTER 5: GL OSSA RY asynchronous transmission Data transmission in which the length of time between transmitted characters may vary. Because characters may not be transmitted at set intervals, start/stop bits are used to mark the beginning and end of each character. Auto Answer Sets the modem to pick up the phone line when it detects a certain number of rings. See S-register S0 in the “Technical Reference” chapter of this manual. auto-dial A process where your modem dials a call for you.
53 buffer A temporary memory area used as storage during input and output operations. An example is the modem's command buffer. byte A group of binary digits stored and operated upon as a unit. Most often the term refers to 8-bit units or characters. One kilobyte (KB) is equal to 1,024 bytes or characters; 640 KB is equal to 655,360 bytes or characters. carrier The basic signal altered or modulated by the modem in order to carry information.
54 CHAPTER 5: GL OSSA RY data communications The transmission or sharing of data between computers via an electronic medium. data compression table A table containing values assigned for each character during a call under MNP5 data compression. Default values in the table are continually altered and built during each call: The longer the table, the more efficient throughput gained. data mode Mode used by a modem when sending and receiving data files.
55 duplex Indicates a communications channel capable of carrying signals in both directions. See half duplex, full duplex. Electronic Industries Association (EIA) Group which defines electronic standards in the U.S. error control Various techniques that check the reliability of characters (parity) or blocks of data. V.42 and MNP error-control protocols use error detection (CRC) and retransmission of flawed frames (ARQ). facsimile A method for transmitting the image on a page from one point to another.
56 CHAPTER 5: GL OSSA RY half duplex Signals can flow in both directions, but only one way at a time. In microcomputer communications, may refer to activation of the online local echo, which causes the modem to send a copy of the transmitted data to the screen of the sending computer. Hz Hertz, a frequency measurement unit used internationally to indicate cycles per second.
57 MNP Microcom Networking Protocol, an error-control protocol developed by Microcom, Inc., and now in the public domain. There are several different MNP protocols, but the most commonly used one ensures error-free transmission through error detection (CRC) and retransmission of flawed frames. modem A device that transmits/receives computer data through a communications channel such as radio or telephone lines.
58 CHAPTER 5: GL OSSA RY parity A simple error-detection method that checks the validity of a transmitted character. Character 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. protocol A system of rules and procedures governing communications between two or more devices.
59 start/stop bits The signaling bits attached to a character before and after the character is transmitted during asynchronous transmission. terminal A device whose keyboard and display are used for sending and receiving data over a communications link. Differs from a microcomputer or a mainframe in that it has little or no internal processing capabilities. terminal mode Software mode that allows direct communication with the modem. Also known as command mode.
60 CHAPTER 5: GL OSSA RY V.22 An ITU-T standard for modem communications at 1200 bps, compatible with the Bell 212A standard observed in the U.S. and Canada. V.22 bis An ITU-T standard for modem communications at 2400 bps. The standard includes an automatic link negotiation fallback to 1200 bps and compatibility with Bell 212A/V.22 modems. V.27 ter An ITU-T standard for facsimile operations that specifies modulation at 4800 bps, with fallback to 2400 bps. V.
61 V.42 An ITU-T standard for modem communications that defines a two-stage process of detection and negotiation for LAPM error control. V.42 bis An extension of ITU-T V.42 that defines a specific data compression scheme for use during V.42 connections. V.90 The ITU-T standard for 56 Kbps modem communications. This technology uses the digital telephone network to increase the bit rate of the receive channel by eliminating the analog to digital conversion commonly found in modem connections. V.
62 CHAPTER 5: GL OSSA RY x2TM Technology U.S. Robotics's trademark for its proprietary technology that uses the digital telephone network to increase the bit rate of the receive channel by eliminating the analog to digital conversion commonly found in modem connections. x2 connections require a modem with x2 technology calling a digitally connected Internet Service Provider or corporate host site compatible with x2 technology.
6 Front-of-the-Case Lights (External Serial Faxmodems) TECHNICAL REFERENCE Symbol Meaning Status AA Auto Answer mode ON when register S0 is set to 1 or higher (Auto Answer), and when answering a call; OFF when modem originates a call. Light flashes when there is an incoming call. CD Carrier Detect ON if modem receives a valid data signal (carrier) from a remote modem, indicating that data transmission is possible.
64 CHAPTER 6: TEC HN ICA L REFERENC E Top-of-the-Case Lights (Voice Faxmodem Pro Externals) Typing Commands Symbol Meaning Status ARQ/Error Control/FAX Fax Operations Data Mode Error Control. ON if modem is set to &M4 or &M5 and successfully establishes an error control connection. Flashes when modem retransmits data to remote modem. Fax Mode: flashes to indicate fax mode. Light What It Means When Lighted POWER The modem is turned on. SEND The computer is sending a data bit to the modem.
Basic Data Commands 65 C or K Stop help screens. $ Use in conjunction with D, S, or & commands (or just AT) to display a basic command list; online help. A Manual Answer: Goes off hook in answer mode. Pressing any key before connected aborts the operations. A/ Re-executes the last issued command. Used mainly to re-dial. Does not require the AT prefix or a Carriage Return.
66 CHAPTER 6: TEC HN ICA L REFERENC E T Tone dial , (Comma) Pause. Linked to S8 register. ; (Semicolon) Return to Command mode after dialing. " Dials the letters that follow (in an alphabetical phone number). ! (Exclamation point) Flashes the switch hook. / Delays for 125 ms. before proceeding with dial string. W Wait for second dial tone (X2 or X4); linked to S6 register. @ Dials, waits for quiet answer, and continues (X3 or higher). $ Displays a list of Dial commands. En Fn Sets local echo.
Basic Data Commands Ln Mn On I3 Product type I4 Current modem settings I5 Nonvolatile memory (NVRAM) settings I6 Link diagnostics I7 Product configuration I9 Plug and Play information I11 Extended link diagnostics 67 Controls speaker volume (internals only). L0 Low volume L1 Low volume L2 Medium volume L3 High volume Operates speaker. M0 Speaker always OFF. M1 Speaker ON until CONNECT. M2 Speaker always ON. M3 Speaker ON after dial, until CONNECT. Returns online.
68 CHAPTER 6: TEC HN ICA L REFERENC E Q0 Displays result codes. Q1 Quiet mode; no result codes. Q2 Displays result codes only in Originate mode. Sr=n Sets register r to n. Sr? Displays contents of S-Register r. S$ Displays a list of the S-Registers. T Sets tone dial. Vn Displays verbal/numeric result codes. Xn V0 Numeric codes V1 Verbal codes Sets result code displayed. Default is X4. NOTE: Result codes 0 - 155 are for 33.6 products and V.90 products.
Basic Data Commands Table6-1 Result Codes X0 X1 X2 X3 X4 13/CONNECT 9600 * * * * 18/CONNECT 4800 * * * * 20/CONNECT 7200 * * * * 21/CONNECT 12000 * * * * 25/CONNECT 14400 * * * * 43/CONNECT 16800 * * * * 85/CONNECT 19200 * * * * 91/CONNECT 21600 * * * * 99/CONNECT 24000 * * * * 103/CONNECT 26400 * * * * 107/CONNECT 28800 * * * * 151/CONNECT 31200 * * * * 155/CONNECT 33600 * * * * 256/CONNECT 28000 * * * * 260/CONNECT 29333 * * *
70 CHAPTER 6: TEC HN ICA L REFERENC E Table6-1 Result Codes X0 220/CONNECT 52000 224/CONNECT 53333 228/CONNECT 54666 232/CONNECT 56000 Adaptive Dialing Wait for 2nd Dial Tone (W) Wait for Answer (@) Fast Dial X1 X2 X3 X4 * * * * * * * * * * * * * * * * * * * * * * * * * *Requires @ in dial string; replaces NO CARRIER 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.
Extended Data Commands Extended Data Commands &$ 71 Displays a list of ampersand (&) commands. &An Enables/disables added result code subsets (see Xn). &A0 ARQ result codes disabled &A1 ARQ result codes enabled &A2 V.32 modulation indicator added &A3 Protocol indicators added LAPM/MNP/NONE (error control) and V42bis/MNP5 (data compression) &Bn Manages modem's serial port rate.
72 CHAPTER 6: TEC HN ICA L REFERENC E &F2 Software flow control template &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. &Hn Sets Transmit Data (TD) flow control (see also &Rn).
Extended Data Commands 73 &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). &N0 Connection speed is determined by the remote modem.
74 CHAPTER 6: TEC HN ICA L REFERENC E &N15 31,200 bps &N16 33,600 bps Note: &N17 through &N39 apply only to V.90 and V.92 products.
Extended Data Commands &N37 54,666 bps &N38 56,000 bps 75 &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 &Hn). &R0 Reserved &R1 Modem ignores RTS &R2 Received Data to computer only on RTS &Sn Controls Data Set Ready (DSR) operations. &S0 DSR override; always ON &S1 Modem controls DSR &Tn Begins test modes.
76 CHAPTER 6: TEC HN ICA L REFERENC E &Un With n > 0, sets the floor connect speed (lowest acceptable connection speed). Note: If your modem cannot connect to the remote modem at or above the speed set with this command, it will hang up. &N=0 &U=0Connects at highest available speed. Note:This default setting should be sufficient for most users. &N>0Connects at fixed speed. &U>0Connects at highest speed above &Un. &N>0 &U>0Connects at highest speed between &Nn and &Un &U0 No minimum connection speed.
Extended Data Commands &U15 31,200 bps &U16 33,600 bps Note: &U17 through &U39 apply only to V.90 and V.92 products.
78 CHAPTER 6: TEC HN ICA L REFERENC E &U37 54,666 bps &U38 56,000 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 Nondestructive, unexpedited &Zn=s Writes phone number string s to NVRAM at position n (n = 03).
Extended Data Commands Table6-2 Switch Default Function OFF Verbal (word) results ON Numeric results 3 ON Result Code Display OFF Suppresses result codes ON Enables result codes 4 OFF Command Mode Local Echo Suppression OFF Displays keyboard commands ON Suppresses echo 5 ON Auto Answer Suppression OFF Modem answers on first ring, or higher if specified in NVRAM ON Disables auto answer 6 OFF Carrier Detect (CD) Override OFF Modem sends CD signal when it connects with another modem, drops CD on di
80 CHAPTER 6: TEC HN ICA L REFERENC E S Registers Table6-3 Register Default Function S0 0 Sets number of rings on which to answer in Auto Answer mode. When set to 0, Auto Answer is disabled. S1 0 Counts and stores number of rings from an incoming call. (S0 must be greater than 0.) S2 43 Stores ASCII decimal code for the escape code character. Default character is +. A value of 128 - 255 disables escape code. S3 13 Stores ASCII code for the Carriage Return character. Valid range is 0 - 127.
S Registers Table6-3 Register Default Function S9 6 Sets required duration, in tenths of a second, of remote modem's carrier signal before recognition by your 3Com U.S. Robotics modem. S10 14 Sets duration, in tenths of a second, that modem waits to hang up after loss of carrier. This guard time allows your modem to distinguish a line disturbance from a true disconnect (hang up) by the remote modem. Note: If you set S10 = 255, the modem will not hang up when carrier is lost.
82 CHAPTER 6: TEC HN ICA L REFERENC E Table6-3 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 duration, in minutes, for inactivity timer. This timer activates when there is no data activity on the phone line; at time-out the modem hangs up. S19 = 0 disables the timer.
S Registers Table6-3 Register Default Function 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. Refer to Table 6-7. S33 0 Bit-mapped register setup. To set the register, see the instructions for S13. Refer to Table 6-8.
84 CHAPTER 6: TEC HN ICA L REFERENC E Bit-Mapped Registers To set a bit-mapped register, select the bit(s) you want on and set the register (for example, 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). Table6-4 Settings for S13 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.
Bit-Mapped Registers Table6-5 Settings for S15 Bit Value Result 7 128 Disable V.42 operation. Note:To disable V.42 detect phase, select sum of bits 3 and 7 (in other words S15 = 136 [8 + 128]) Table6-6 Settings for S27 Bit Value Result 0 1 Enables ITU-T V.21 modulation at 300 bps for overseas calls; in V.21 mode, the modem answers both overseas and domestic (U.S. and Canada) calls, but only originates V.21 calls (default Bell 103). 1 2 Enables unencoded (non-trellis coded) modulation in V.32 mode.
86 CHAPTER 6: TEC HN ICA L REFERENC E Table6-7 Settings for S32 Bit Value Results 0 1 V.8 Call Indicate enabled. 1 2 Enables V.8 mode. 2 4 Reserved. 3 8 Disable V.34 modulation. 4 16 Disable V.34+ modulation. 5 32 Disable x2 modulation. 6 64 Disable V.90 modulation. 7 128 Disable V.92 modulation Table6-8 Settings for S33 Bit Value Results 0 1 Disable 2400 symbol rate. 1 2 Disable 2743 symbol rate. 2 4 Disable 2800 symbol rate. 3 8 Disable 3000 symbol rate.
Bit-Mapped Registers Table6-9 Settings for S41 Bit Value Results 4 16 Reserved. 5 32 Reserved. 6 64 Reserved. 7 128 Reserved.
88 CHAPTER 6: TEC HN ICA L REFERENC E
REGULATORY INFORMATION 7 Manufacturer's Declaration of Conformity We declare under our sole responsibility that this product (56K Faxmodem) to which this declaration relates, is in conformity with the following standards or more normative documents: ANSI C63.4-1992 Methods of Measurement Federal Communications Commission 47 CFR part 15, subpart B 15.107 (e) Class B conducted limits 15.109 (g) Class B Radiated Emissions Limits U.S. Robotics Corporation 3800 Golf Road Rolling Meadows, IL 60008 U.S.A.
90 CHAPTER 7: REGUL ATORY INF ORMA TION (2) this device must accept any interference received including interference that may cause undesired operations. Caution to the User Part 68 The user is cautioned that any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. This equipment complies with FCC Rules Part 68.
Caution to the User 91 Caution to the User To avoid the risk of electrical shock, disconnect the phone cord from the modem and unplug the power to the computer before removing the cover.
92 CHAPTER 7: REGUL ATORY INF ORMA TION allowed to be connected to a telephone interface. The termination on an interface may consist of any combination of devices subject only to the requirement that the sum of the Ringer Equivalence Numbers of all devices does not exceed 5. The Ringer Equivalence Number is located on the bottom of the modem. NOTICE: The Industry Canada (IC) label identifies certified equipment.
For Canadian Modem Users 93 exigences techniques relatives au matériel terminal. Le Ministère n'assure toutefois pas que le matériel fonctionnera à la satisfaction de l'utilisateur. Avant d'installer ce matériel, l'utilisateur doit s'assurer qu'il est permis de le raccorder aux installations de l'entreprise locale de télécommunication. Le matériel doit également être installé en suivant une méthode acceptée de raccordement.
94 CHAPTER 7: REGUL ATORY INF ORMA TION
