Taking advantage of the modern telephone network
x2 technology uses the increasingly digital telephone network to bring you faster downloads, by eliminating the analog-to-digital conversion in the downstream path. x2 takes advantage of the typical network configuration found when an analog subscriber connects to a digitally connected server. Since x2 bypasses the analog-to-digital conversion in the downstream path, it can use nearly all of the available 64K network bandwidth. (Upstream data, typically less speed sensitive, travels at the standard V.34 rate.)
The result is a completely new kind of transmission technique. Based on encoding rather than modulation, it can give you download speeds that you never thought possible. Whats more, with standard V.42bis compression, x2 can download at speeds up to a blistering 115.2Kbps.
The new standard for online speed
3Com has already submitted x2 to the ITU-T standards committee for acceptance as the next online standard. For more information on U.S. Robotics x2 technology, see our World Wide Web page at http://.3com.com.

Features

Data Communications Your modem offers a range of internationally accepted standard modulation methods and protocols. It utilises hardware-based V.42/MNP 2-4 error control and V.42 bis/ MNP 5 data compression. Your modem will transmit at speeds up to 33,600 bps with throughput to 115,200 bps. Also, it is universally compatible with the following standards: V.34, V.32 bis, V.32, V.22 bis, Bell 212A/V.22, V.23, V.21 modems.
Fax Capability You can use your modem with Class 1 or Class 2.0 fax software to exchange faxes with Group 3 fax machines world-wide at speeds up to 14.400 bps.
Flash ROM Upgradable Sportster Flash supports software download through flash memory. You can download upgrades to obtain quickly and easily the latest features. Speakerphone* You can use your new Sportster as a full-duplex speakerphone without the echoing sound of some speakerphones. The full-duplex feature allows you to speak at the same time as someone on the other end without losing any sound quality. This affords you all the convenience of a speakerphone without the extra hardware and leads for the home or office. The external modems have built-in microphones.
Personal Voice Mail* With Personal Voice Mail, your modem is a full-featured messaging system offering business-quality voice mail features in the convenience of your home or office. Using this feature, you can send voice greetings and record voice messages like a standard answering machine with several voice mailboxes on one system. You can even access your voice messages remotely. Your modem will auto-detect incoming fax, voice, and data calls and provides fax-on-demand services you can tailor to your needs. * A headset, external powered speakers or soundcard is required to utilise all voice features including hands-free speakerphone.

External Modem Installation
Getting Started This chapter will walk you through the installation of your external modem with your personal computer. Before getting started, make sure that you have the following items: Modem Serial Cable Data/Fax/Voice software and User Guide RJ11 - telephone lead & Tail lead adaptor Power Adaptor PSTN (Standard) Telephone Socket This Guide There are two parts to installation: software and hardware. Software allows you to communicate with your modem so that you can send and receive data and faxes, as well as activate voice features. Software installation is discussed in your communications software user guide. Hardware is the modem itself, which will be connected to your computer by the serial cable.
Hardware Installation Steps Before you begin the modem installation, turn off your computer and any attached devices, such as a printer. Follow these steps to install your modem. Refer to the drawing below of the back panel. 1. Connect the serial cable to the modem and to the computer. When looking for your serial port label on the back of your computer, select COM, MODEM, RS-232, or SERIAL. Do NOT select AUX, GAME, LPT, or PARALLEL. Note which serial port you selected. This information will be necessary when installing your communications software. Plug the power adaptor into the power socket and into a standard wall outlet. Plug one end of the phone lead into the telephone socket (labelled with a wall plug icon on the bottom of the case) and the other end into a phone wall socket.
If you wish to use your modem and phone through the same phone wall socket, plug your phone's lead into the modem's other socket (labelled with a phone icon on the bottom of the case), using the supplied Tail lead adaptor. 5. An external powered speaker must be connected for speakerphone use. For more information, see the next page and consult your software manual.

Volume

Power on/off To computer To power To wall To phone source To speaker socket
Speaker Attachment An external powered speaker or headset can be connected to the 3.5 mm speaker socket located on the back of your Sportster. This accessory is required when using the speakerphone and voice mail facilities. Microphone The microphone that is built into your modem is located on the front panel. Installing your Software 1. Insert the software diskette included with your modem or another modem software disk. If using other software, consult its own manual for installation procedures. From Program Manager, choose File. Then choose Run and type a:\install and press <Enter>. Once the software is installed, enter the software group and click on the application icon.

Testing Your Installation 1. To test your modem and software installation, perform the software function that puts your computer in Terminal mode. In Terminal mode, a cursor appears on your screen, allowing you to send commands directly to the modem. To determine if your computer and modem are communicating properly, type the following command: AT E1 Q V1<Enter> If the COM port and IRQ settings are correct on your modem and in your software, the modem responds: OK If the characters you type do not appear, no OK appears, or double characters appear, see the Troubleshooting section in this guide.

Sportster Flash and x2

Congratulations on your purchase of x2 56K technology! x2 is a revolutionary new technology that allows your modem to use normal analogue phone lines to enable download speeds up to 56kbps.

Information about x2

For more information about x2, visit the 3Com, U.S. Robotics brand x2 Web Site at http://www.3Com.com.

Enhanced x2 Features

Your Sportster modem with x2 has new result codes and the following new features. Refer to later sections for more information.
To do this Detemine if x2 is enabled in your modem Disable or enable x2 Limit the upper speed limit of an x2 connection Limit the lower speed limit of an x2 connection
Use this command ATI7 ATS32.5=1 or 0 AT&N AT&U
Note: New x2 features should be transparent to most users. If you are an advanced user, see Controlling x2 and Controlling Link Speeds with &N and &U for detailed information regarding these new features.
How to Tell if x2 is Enabled in Your Modem
If you are not sure whether x2 is enabled in your Sportster modem, use the ATI7 command to display product configuration information. If x2 is enabled on your Sportster modem, the following information displays:
USRobotics Product type Options Fax Options Clock Freq Eprom Ram FLASH date FLASH rev Serial Number OK
Sportster Configuration Profile. (Country) External V32bis, V.34+,x2 Class 1/Class 2.0 92.0Mhz 256k 64k 6/30/97 10.1.68 xxxxxxxxxxxxxxxxx
Note: Dates, serial numbers, and revision numbers may vary. The most important line is the Options line, which lists support for x2.

How x2 Works

U.S. Robotics brand x2 technology enables analogue modems to receive data at up to 56 kbps over the standard analogue, public switched telephone network (PSTN). x2 overcomes the limitations imposed on standard, analogue modems by exploiting the digital connections that most Internet and online service providers have at their end to connect to the PSTN.
The Shift from Analogue to Digital Circuits
When the first telephone networks were established, they were completely analogue. Over time, telephone companies began replacing portions of their analogue networks with digital circuits, which provided a higher telephone signal quality at a more economical price. Today, the PSTN is almost entirely digital. Typically, the only portion of the telephone network that remains analogue is the line that connects your home to the telephone company's local exchange. The rest of the telephone network is digital.

Client and Server Modems

x2 will not require changes to your wiring and equipment that's already in place. All that is required to use x2 is a software upgrade.

Client Modems

x2 client modems can receive data at speeds up to 56kbps* and send data at V.34 speeds up to 33,600bps. The following products are examples of U.S. Robotics brand Client Modems: Courier V.Everything with x2 Sportster with x2 Analogue Modem Pools or NETServer with x2

Server Modems

The digital x2 modems that x2 client modems connect to are called x2 server modems. Server modems can send data to x2 client modems at speeds up to 56kbps. A server must have a digital interface to the PSTN. This digital interface can be in the form of a trunk-side T1, Primary Rate Interface (PRI) , or Basic Rate Interface (BRI). The following products are examples of server x2 modems:
Courier I-modem with x2 (in Server Mode) Quad Modem 5.0/5.1 (in Server Mode) Pending line conditions Sportster Flash x2 - Users Guide 17
MP I-modem or NETServer I-modem with x2

Making x2 Work

To use x2, the x2 client modem must connect to an x2 server modem. If clients attempt to connect to ISPs that do not use x2, the client modem will negotiate the next available modulation. For example, an x2 client modem calling into an ISP that only supports V.34, will negotiate the highest V.34 connection rate. The maximum V.34 connection speed is 33.6kbps. When an x2 client modem connects to an x2 server modem, the path through the telephone network between the modems is subject to the following conditions for an x2 connection to be made.
A Digital Connection At One End
ISPs or online services must have a digital connection to the PSTN. Most major online services have digital connections to the PSTN.
Only One Digital-to-Analogue Conversion
There can be only one digital-to-analogue conversion in the telephone network between the x2 server modem and the x2 client modem.

Controlling x2

Use the following S58 settings to control x2:

To do this

Disable x2 Enable x2 (default)

Use this command

S32.5=1 S32.5=0
Controlling Link Speeds with &N and &U
You can use the &N and &U commands to control link speeds. Sportster modems without x2 can still use the &N and &U commands, but can only control link speeds up to 33.6kbps.

Troubleshooting

Before the modems connect
If your modem doesn't respond to any AT commands, Make sure the modem is on. Make sure you selected the correct COM port and IRQ in your communications software, and/or in your Windows Control Panel. Make sure the computer is in Terminal mode. Type in all upper (AT) or lower (at) case. There may be a COM port/IRQ conflict. Try alternative IRQ/ COM port settings.
If your modem displays double characters on your monitor, Both your modem's and software's local echoes are on and need to be turned off by typing the command ATE0<Enter>. If your modem doesn't go off hook to dial a number or doesn't answer the phone, Make sure the phone lead is connected to the socket on the modem labelled TELCO and to a phone wall socket. Review your software manual to see what DTR operations are required. Make sure that your software has auto answer enabled.
If both modems exchange carrier signals but fail to establish a communications link, Place the call again. The telephone company routes all calls, even local calls, differently each time you call. Call a different modem to see if the problem persists. Sportster Flash x2 - Users Guide 25
The problem may be with the modem you first tried to call. If your modem doesn't connect at 2400 bps with a 2400 bps modem, The remote modem might be an older 2400 bps modem that does not support error control. Disable error control with the following command: AT&M0<Enter> Try connecting with the remote modem again. When the call is finished, remember to reset the modem: ATZ<Enter>

During data transfer

If your screen displays random or garbage characters, Set your software to the same word length, parity, and Stop bits as the remote modem. Make sure that your software and modem are set to the same flow control setting and to either a fixed or variable serial port rate. Type the following command to load the template that enables hardware flow control as well as other optimal settings. AT&F1<Enter> Disable any Terminate and Stay Resident (TSR) programs running in the background.
If your communications software is reporting many Cyclic Redundancy Check (CRC) errors and low Characters Per Second (CPS), You might have a bad phone line. Place the call again. The phone company routes calls differently each time you call. Type the following command to load the template that enables hardware flow control as well as other optimal settings: AT&F1<Enter> Lower the serial port rate in your communications software to 38,400 bps or 19,200 bps. Try a different file transfer protocol (do not use Xmodem if other protocols are available). Disable any Terminate and Stay Resident (TSR) programs running in the background. Sportster Flash x2 - Users Guide

If errors are occurring in your V.17 fax transmissions, Enter the following initialisation string in your software modem set-up screen: AT&H3&I2&R2S7=60 Disable any Terminate and Stay Resident (TSR) programs that are running in the background. If your problems occur when you send faxes from Windows and your computer has a 16550 UART, load the comdriver that came with your fax software. (This may require re-installing the software.)
If you are running DOS 6.0, run the following DOS program before you run your fax software. Type VER at the DOS prompt to determine your version of DOS. Run the program MEMMAKER.EXE from the DOS directory prompt. This program loads all of your Terminate and Stay Resident (TSR) programs in the most efficient order.
U.S. Robotics On-line Resources
Connecting to the U.S. Robotics BBS
To connect to the U.S. Robotics Bulletin Board System (BBS), dial 33320910308 If this is your first time connecting to our BBS, you will be asked to enter your name and a password and to fill out a questionnaire.

Internet FTP

The Internet FTP provides a free library containing the same files as the BBS site. To access the FTP site type ftp.usr.com.

Internet on Demand

The Internet on Demand (IOD) provides automatic technical support through a library containing product information, quick reference cards, and installation help. To obtain an index of available documents, send a blank e-mail to eurosupport@usr.com. To have a document emailed to you, place the document's number in the subject field.

World Wide Web

The U.S. Robotics Home Page contains the same information as the Internet on Demand listing, as well as information about U.S. Robotics. To log on to the Web, type http://www.3Com.com.

CompuServe

Access the same information as the Internet FTP site through CompuServe.

America Online

Connect to the U.S. Robotics Forum through America Online. Go to the Keyword field and type USROBOTICS to connect to the various U.S. Robotics resources, such as libraries, message boards, online customer support, and product announcements.
Fax and Technical Support Hotline
Technical questions about U.S. Robotics modems can also be answered via fax or by technical support representatives. Hotline: +33 (0) 24 Fax: +33 (0) 34
Are You Still Having Problems?
Re-read this manual, especially the Remarks on Using the Modem section. Contact your reseller who will be able to provide you with the necessary assistance. This is much more efficient and less costly than sending the modem back to us for a problem that is possibly only a simple matter of adjusting the settings. If your reseller cant help you, contact U.S. Robotics Customer Support. When you call, specify your modem serial number (found on the outside of the box), the software being used, and if possible, the contents of your ATI7 screen. Hotline: +33 (0) 24 Fax: +33 (0) 34 USR BBS: +33 (0) 08 CompuServe: GO USROBOTICS Internet: eurosupport@usr.com

If You Must Return the Modem to Us
Contact U.S. Robotics Customer Support to obtain a Return Materials Authorisation (RMA) number. You must have an RMA number before returning the modem to us. Phone : +33 (0) 97 Fax : +33 (0) 94 Ship the unit, postage paid, in a strong box made of corrugated cardboard with plenty of packing material (preferably the original container.) Include your RMA number, name and address on the shipping label as well as inside the package. Ship to the following address: U.S. Robotics Logistics sarl European Repair Center RMA# Rue Jules Verne Centre de Gros N2 F-59818 Lesquin Cedex France

Glossary

Cross references are printed in boldface. Cross references with items in the Command Summary chapter are printed in italics. Analogue Loopback A modem self-test in which data from the keyboard or an internal test pattern is sent to the modem's transmitter, modulated into analogue form, looped back to the receiver, and demodulated into digital form. Analogue 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. Contrast with digital signals. Answer Mode The mode used by your modem when answering an incoming call from an originating modem. The transmit/receive frequencies are the reverse of the originating modem, which is in Originate mode. Application A computer program designed to perform a specific function, such as a word processor or a spreadsheet. ARQ Automatic Repeat reQuest. A general term for a function that automatically allows your modem to detect flawed data and retransmit it. See MNP and V.42. ASCII American Standard Code for Information Interchange. A 7bit binary code (0's, 1's) used to represent letters, numbers, and special characters such as $, !, and /.
Asynchronous Transmission Data transmission in which the length of time between transmitted characters may vary. Because the time lapses between transmitted characters are not uniform, the receiving modem must be signalled as to when the data bits of a character begin and when they end. The addition of Start and Stop bits to each character serves this purpose. Auto Answer Sets the modem to pick up the phone line when it detects a certain number of rings. See S-register (S0) in Technical Quick Reference. Auto Dial A process where your modem dials a call for you. The dialling process is initiated by sending an ATDT (dial tone) or ATDP (dial pulse) command followed by the telephone number to dial. Auto Dial is used to dial voice numbers. See command Dn. Baud Rate A term used to measure the speed of an analogue transmission from one point to another. Although not technically accurate, baud rate is commonly used to mean bit rate. Binary Digit A 0 or 1, reflecting the use of the binary numbering system (only two digits). Used because the computer recognises either of two states, OFF or ON. Shortened form of binary digit is bit. Bit Rate Also referred to as transmission rate. The number of binary digits, or bits, transmitted per second (bps). Communications channels using telephone channel modems are established at set bit rates, commonly 300, 1200, 2400, 4800, 9600, 14,400 and higher. Bits Per Second (BPS) The bits (binary digits) per second rate. Thousands of bits per second are expressed as kilobits per second or kbps. Buffer A memory area used as temporary storage during input and output operations. An example is the modem's command buffer.

DTE Data Terminal (or Terminating) Equipment. A computer that generates or is the final destination of data. Duplex Indicates a communications channel capable of carrying signals in both directions. See Half Duplex, Full Duplex. EIA Electronic Industries Association, 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. Commonly referred to as fax. Fax Mode The mode in which the fax modem is capable of sending and receiving files in a facsimile format. See definitions for V.17, V.27ter, V.29. Flow Control A mechanism that compensates for differences in the flow of data input to and output from a modem or other device. See commands &Hn, &In, &Rn. Frame A data communications term for a block of data with header and trailer information attached. The added information usually includes a frame number, block size data, error-check codes, and Start/End indicators. Full Duplex Signal flow in both directions at the same time. In microcomputer communications, may refer to the suppression of the on-line Local Echo.
Half Duplex Signal flow in both directions, but only one way at a time. In microcomputer communications, may refer to activation of the on-line 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 one cycle per second. ITU-T An international organisation that defines standards for telegraphic and telephone equipment. For example, the Bell 212A standard for 1200bps communication in North America is observed internationally as ITU-T V.22. For 2400-bps communication, most U.S. manufacturers observe V.22 bis. The initials ITU-T represent the International Telecommunications Union - Telecommunications sector. LAPM Link Access Procedure for Modems, an error-control protocol defined in ITU-T Recommendation V.42. Like the MNP protocols, LAPM uses cyclic redundancy checking (CRC) and retransmission of corrupted data (ARQ) to ensure data reliability. Local Echo A modem feature that enables the modem to display keyboard commands and transmitted data on the screen. See command Hn. 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 errored frames. Modem A device that transmits/receives computer data through a communications channel such as radio or telephone lines. It also changes signals received from the phone line back to digital signals before passing them to the receiving computer.

Non-volatile Memory (NVRAM) User-programmable random access memory whose data is retained when power is turned off. On the Sportster, it includes four stored phone numbers and the modem settings. OFF/ON Hook Modem operations that are the equivalent of manually lifting a phone receiver (taking it off-hook) and replacing it (going on-hook). On-line Fallback/Fall Forward A feature that allows high-speed, error-control modems to monitor line quality and fall back to the next lower speed in a defined range if line quality diminishes; as line conditions improve, the modems switch up to the next higher speed. Originate Mode The mode used by your modem when initiating an outgoing call to a destination modem. The transmit/receive frequencies are the reverse of the called modem, which is in Answer mode. 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. Protocols vary, but communicating devices must follow the same protocol in order to exchange data. The format of the data, readiness to receive or send, error detection and error correction are some of the operations that may be defined in protocols. RAM Random Access Memory. Memory that is available for use when the modem is turned on, but that clears of all information when the power is turned off. The modem's RAM holds the current operational settings, a flow control buffer, and a command buffer.
Remote Digital Loopback A test that checks the phone link and a remote modem's transmitter and receiver. Remote Echo A copy of the data received by the remote system, returned to the sending system, and displayed on the screen. Remote echoing is a function of the remote system. ROM Read Only Memory. Permanent memory, not user-programmable. Serial Transmission The consecutive flow of data in a single channel. Compare to parallel transmissions where data flows simultaneously in multiple channels. Start/Stop Bits The signalling bits attached to a character before 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. Throughput The amount of actual user data transmitted per second without the overhead of protocol information such as Start and Stop bits or frame headers and trailers. Compare characters per second. V.8 The ITU-T standard specification that covers the initial handshaking process.

Quick Reference

Introduction The Quick Reference appendix includes information about the following: Front Panel Lights Command Summary S-Registers

Front Panel Lights

Symbol AA Meaning Auto Answer/ Answer Status Answer mode: ON when register S0 is set to 1 or higher (Auto Answer), and when answering a call; OFF when modem originates a call. Light flashes when there is an incoming call. ON if modem receives a valid data signal (carrier) from a remote modem, indicating that data transmission is possible. Always ON if CD override is ON (&C0). Flashes when modem sends result codes or passes received data bits. Flashes when computer sends a data bit. ON if modem receives a DTR Ready signal from computer. Always ON (modem ignores DTR) if the DTR override is ON (&D0). ON until modem lowers CTS when Transmit Data hardware flow control is enabled (&H1, &H3). Data Mode: Automatic Repeat Request. 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. ON when modem accesses the phone line. OFF when modem is On Hook.

Carrier Detect

RD SD TR
Received Data Send Data Data Terminal

Clear to Send

ARQ/ FAX
Error Control/ Fax Operations

Off Hook

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 dont include a number, zero is assumed. For example, if you type ATB, the command ATB0 is assumed. Every command but A/, +++ and A> 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 doesnt count the AT prefix, carriage returns, or spaces.
Note: Defaults are marked with an asterisk (*).

Command Set

$ A Displays a basic command list; on-line help. Manual Answer: goes off hook in answer mode. Pressing any key aborts the operations. Re-executes the last issued command. Used mainly to redial. This does not require the AT prefix or a Carriage Return. Aborts off-hook dial/answer operation and hangs up. Required command prefix, except with A/ and +++. Use alone to test for OK result code. U.S./ITU-T answer sequence. B0 ITU-T V.25 answer sequence B1 U.S. answer tone

12,000 bps 14,400 bps 16,800 bps 19,200 bps 21,600 bps 24,000 bps 26,400 bps 28,800 bps 31,200 bps 33,600 bps 33,333 bps 37,333 bps 41,333 bps 42,666 bps 44,000 bps 45,333 bps 46,666 bps 48,000 bps 49,333 bps 50,666 bps 52,000 bps 53,333 bps 54,666 bps 56,000 bps 57,333 bps
&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 doesnt send break * &Y1 Destructive, expedited &Y2 Non-destructive, expedited &Y3 Reserved &Zn=s Writes phone number string s to NVRAM at position n (n = 0*3). Writes last executed dial string to NVRAM at position n (n = 0*3). Displays the phone number stored at position Sportster Flash x2 - Users Guide

&Zn=L

&Zn? 54
n (n = 0*3). <Ctrl>C <Ctrl>K <Ctrl>S +++ Cancels the display of the help screens. Cancels the display of the help screens. Pauses help screens. Escapes to online-command mode.

S-Registers

To change a setting, use the ATSr=n command, where r is the register and n is a decimal value from 0*255 (unless otherwise indicated). Register Default SFunction Sets the number of rings on which to answer in Auto Answer Mode. When set to 0, Auto Answer is disabled. Counts and stores the number of rings from an incoming call (read only). Stores the ASCII decimal code for the escape code character. Default character is "+." Stores the ASCII code for the Carriage Return character <CR>. Stores the ASCII decimal code for the Line Feed character <LF>. Stores the ASCII decimal code for the Backspace character <BS>. Sets the number of seconds the modem waits for dial tone before dialling. Sets the number of seconds the modem waits for a carrier or answers before returning on-hook and sending a No Carrier result code. Sets the duration, in seconds, for the pause (,) option in the Dial command. Sets the required duration, in tenths of a second, of the remote modems carrier signal before recognition by your modem.

Register Default S10 7

Function 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 dont 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 *70). For example: ATDT *70 phone number. Note: If you set S10 = 255, the modem will not hang up when carrier is lost. Dropping DTR hangs up the modem.

Sets the duration and spacing, in milliseconds, for tone dialling. Sets the duration, in fiftieths of a second, of the guard time for the escape code sequence.

Register Default S13 0

Function Bit-mapped register. Select the bit(s) you want on and set S13 to the total of the values in the Value column. For example, ATS13 = 17 enables bit 0 (value is 1) and bit 4 (value is 16). Bit Value Result Reset when DTR drops. Reset non-MNP transmit buffer from 1.5K to 128 bytes.* Set backspace key to delete. On DTR signal, auto dial the number stored in NVRAM at position 0. At power on/reset, Auto Dial the number stored in NVRAM at position 0. Reserved. Reserved. Disconnect on escape code.
* The 1.5K-byte non-ARQ buffer allows data transfer with Xmodem- and Ymodem-type file transfer protocols without using flow control. The 128-byte option lets remote users with slower modems keep data youre 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 modems buffer doesnt exceed the size of their screen. This is also very helpful in situations when a remote modem/printer application is losing characters.

Register Default S14 S0

Function Reserved. Bit-mapped register setup. To set the register, see instructions for S13. Bit Value Result Disable ARQ/MNP for V.22. Disable ARQ/MNP for V.22 bis. Disable ARQ/MNP for V.32/V.32bis. Disable MNP handshake. Disable MNP level 4. Disable MNP level 3. MNP incompatibility. Disable V.42 operation.
Bit-mapped register setup. To set the register, see instructions for S13. Bit 2-7 Value 4-128 Result Reserved. Touch tone dialling test. Reserved.

S17 S18

Reserved. 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.

Register Default S19 0

Function 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. Reserved. Sets the length, in 10-millisecond units, of breaks sent from the modem to the computer; applies to MNP or V.42 mode only. Stores the ASCII decimal code for the XON character. Stores the ASCII decimal code for the XOFF character. Reserved. Sets the duration, in hundredths of a second, that DTR must be dropped so that the modem doesnt 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.) Reserved.

S20 S21

S24 S25

Register Default S27 1

Function Bit-mapped register setup. To set the register, see instructions for S13. Bit 0 Value 1 Result Enables ITU-T V.21 modulation at 300 bps for overseas calls; in V.21 mode, the modem answers both overseas and domestic (U.S. and Canada) calls, but only originates V.21 calls. (Default Bell 103) Enables unencoded (nontrellis coded) modulation in V.32 mode; rarely used part of ITU-T Recommendation V.32. Disables V.32 modulation. Disables 2100 Hz answer tone to allow two V.42 modems to connect more quickly. Enables V.23 fallback mode. Disables V.32 bis mode. Reserved. 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, 12.000 and 14.400 bps or greater result codes.

64 128

Register Default S8 255
Function Eliminates the V.32 answer tones for a faster connection. Default item, all times are in tenths of seconds. Disables all connections except V.32 at 9600 bps. Sets the duration, in tenths of a second, of the V.21 answer mode fallback timer. Reserved. Volume control for speakerphone. Bit mapped register setup. To set the register, see the instructions for S13. Bit Value Result V.8 Call Indicate enabled. Enables V.8 mode. Disable V.FC modulation. Disable V.34 modulation. Disable 33.6 kbps support. Reserved. Reserved. Reserved.

S30 S31 S32

Bit mapped register setup. To set the register, see the instructions for S13. Bit Value Result Disable 2400 symbol rate. Disable 2743 symbol rate. Disable 2800 symbol rate. Disable 3000 symbol rate. Disable 3200 symbol rate. Disable 3429 rate. Reserved. Disable shaping.

Register Default

Function
Bit mapped register setup. To set registers, see instructions for S13. Bit Value Result Disable 8S-2D trellis encoding. Disable 16S-4D trellis encoding. Disable 32S-2D trellis encoding. Disable 64S-4D trellis encoding. Disable non-linear coding. Disable TX level deviation. Disable Pre-emphasis. Disable Pre-coding.

S35-S37 S38 0

Reserved. Sets an optional delay, in seconds, before a forced hang-up and clearing of the Transmit buffer when DTR drops during an ARQ call. This allows time for a remote modem to acknowledge receipt of all transmitted data before it is disconnected. The modem immediately hangs up when DTR drops. This option only applies to connections terminated by dropping DTR. If the modem receives the ATH command, it ignores S38 and immediately hangs up.
Sportster Flash Specifications
Data: ITU-T V.34 (Inc. 33,600bps), V.FC, ITU-T V.32bis, V.23, V.22 bis, V.22, V.21 and Bell 212A, 103. Fax: Send and receive Group III Fax, Class 1, Class 2.0; ITU-T V.17, V.29, V.27 ter Speeds Data: 33.6K, 31.2K, 28.8K, 26.4K, 24K, 21.6K, 19.2K, 16.8K, 14.4K, 12K, 9600, 7200, 4800, 2400, 1200, 1200/75/1200, 300 bps Fax: 14.4K, 12K, 9600, 7200, 4800, 2400 Error correction ITU-T V.42, MNP 2-4 Data compression ITU-T V.42 bis, MNP level 5 Operation Full/Half duplex on 2 wire telephone line Format (DTE-DCE) Serial, binary, asynchronous Command set Compatible with the AT command set; Fax mode: EIA 578 Class 1, EIA 592 Class 2.0 Flow control XON/XOFF, RTS/CTS Telephone interface RJ11 Voice coding IMA ADPCM Tone detection DTMF Call differentiation Toggle between voice, fax and data Silence detect Adjustable level and duration Dialling Pulse (pulses 0-9), tone (DTMF 0-9, #, *) Call status Dial tone, busy tone, voice detect Configuration storage Two modem configurations and four telephone numbers Transmission level -10dBm Reception sensitivity -43dBm Operating temperatureFrom 0 to +50 C Storage temperature From -40 to +70 C Transportation temperature From -40 to +70 C Operating humidity From 20% to 80% without condensation Storage humidity From 5% to 90% without condensation Operating altitude 3000 meters Compatibility