3Com 56K Error Control

Error Control 12-5

Lower-speed V.

Protocols Older, lower-speed "V." protocols do not employ lin e probing. Instead

they use predefined answer tones to specify or identify speed capabilities.

These protocols define the following maximum speeds:

■V.32terbo: 19.2 Kbps, with an additional USR device-t o-USR device

speed of 21.6 Kbps.

■V.3 2b is : 14.4 Kbps.

■V.32, V.22bis, etc.: 9600 bps and lower.

ASL (used in V.32terbo and V.32bis modes) is a technique that allows the

Business Modem’s receivers and transmitters to act independently of each

other. One transceiver may slow down and then speed up without

affecting the data flow on the other. The result is more efficient line

operation.

While most modems on the market now use higher speeds, there may be

a problem in answering older, V.32 modems at 9600 bps. Use Register

S28 to modify the duration of the extra tones used in V.32 negotiations,

in the rare instance that this may be necessary. See Appendix A,

S-Registers.

Error Control Business Modems can employ error-control techniques during data

connections.

High-speed data calls are vulnerable to errors unless the data is protected

by error control. If your Business Modem connects with a remote device

at a high speed, but without error control, and if you are not using an

error control protocol for your call, you may lose data.

Automatic Repeat Request (ARQ) is a method used in many error-control

protocols to ensure that any data that has been corrupted in transit is

retransmitted. We use the term to designate a connection under error

control.

Error-Control

Commands You can use Error-Control commands to enable ARQ (error control). The

Business Modem and the remote device must use the same protocol.

Contents

Main 3Com Corporation 3800 Golf Rd. Rolling Meadows, Illinois 60008 C A BOUT T HIS G 1 2 3 4 5 6 7 8 9 R 10 11 12 T 13 14 15 16 A B C D E F G H I G J ABOUT THIS GUIDE Conventions Table 1 Notice Icons Table 2 Text Conventions n Page Page 1 Windows 95/98 Page Page Page Page Page Page Windows NT 4.0 and Later Page Page Page Macintosh Page Page Page Page Other Operating Systems Page 2 Overview Basic AT commands Using S-Registers Page Understanding bit-mapped S-Registers 3 This chapter contains information about Command and Online Modes DO NOT type AT before +++ or <ENTER> after the command Page Controlling Local Echo Data and Fax Modes Page Page 4 H ANGING U Dialing Page Carrier Loss Redial Answering Calls Making International calls Call Detection Caller ID Functions Page Page Distinctive Ring Support Page Page 5 Overview Saving a Phone Number to NVRAM Working with Flash Memory Page 6 D This chapter contains information about: Result Code Display Commands and in what format they are displayed Additional Result Code Subsets 7 S Data Terminal Ready Data Set Ready Carrier Detect Page 8 Overview Serial Port Rates Your software may use terms such as locked serial port (fixed rate) or autobaud (variable rate). The serial port rate MUST be equal to or higher than the Connection rate (&Nn). Connection Rates Controlling Link Speeds with &N and &U Page &N and &U Command Values Use the following table for a complete list of &N and &U link speeds and their associated indexes: Setting DTE Rate to 230 Kbps Page 9 THE BUSINESS MODEM REMOTELY Overview Setting Up Remote Access Page Accessing the Host Page Page Page Page Page 10 Overview Setting up Dial Security Page Page Page Page Maintaining Security Accounts What the Guest User Needs to Do Configuring Dial Security Remotely Page 11 Overview Hardware and Software Flow Control Received Data Flow Control Page Transmit-Data Flow Control by its attached computer. Page 12 DATA COMPRESSION, AND T Handshaking Page V.90 Capabilities Other Protocols Page Error Control Page Page Data Compression Getting Maximum Throughput Page Page Page 13 S Querying Overview Page Displaying Help Page 14 Overview Testing the Business Modem using AT&T n Page Page Page Page Page Page Testing the Business Modem using S-Resister 16 Page Page Page 15 Problems That Occur Before Connecting Page Page Problems that Occur After Connecting Page Page Page Page 16 Overview Checking Your Business Modems Software Version Getting New Operating Software Sending New Software to your modem Page If Your Modem Doesnt Respond A Understanding Bit-Mapped S-Registers How bits are mapped to decimal values Page Using Bits Using Decimal Value s Default S-Register Settings * Bit-mapped registers have up to eight functions. A complete list of S-Registers Page Page Page Page Page Page Page B S Basic Command Set 1 Wait 1 second after sending the last item of data. Optional parameters: Page See Appendix A, S-Registers for a listing of all the S-Registers. Ampersand (&) The serial port rate MUST be equal to or higher than the &Nn rate. Page Page Page Page Page Percent (%) Using%C1 will not reverse any changes that you wrote to NVRAM (with &W) or forced (with%C2). Octothorpe (#) Page C Hardware Flow Control template send AT&F1 to your modem. Page Software Flow control template send AT&F2 to the modem. No Flow Control send AT&F0 to the modem. Page Page D S Result Code Meanings Result Codes Sets for Xn Value s Result Code s X0 X1 X2 X3 X4 X5 X6 X7 E Technical Specifications is also compatible with many nonstandard schemes. The following schemes are supported: Modulation clients can call into your Business Modem to get 56K connections Page Additional Specifications Page Page Page F F-2 APPENDIX F: ASCII CHART G P the following optional Class 2.0 fax commands: Fax Service Class 1 Commands FAX Service Class 2.0 Commands Fax Mode Flow Control Setting FCC Notice Notes H This appendix explains how to view the twelve LEDs on the front of your Business Modem. Page I S-Registers Page Page Page Page Page Page Page J 3COM CORPORATION LIMITED WARRANTY Page Page Notices FCC Registration FCC Notice FCC Notice: Radio and Television Interference Page G