3Com 56K - page 188

I-6 APPENDIX I: S-REGISTERS

Bit Value Result

1 2 Disable the Business Modem's

enhanced, proprietary V.32bis

modulation. Used for

troubleshooting.

2 4 Disable the faster retrains that occur

during proprietary V.32terbo

modulation. Used for

troubleshooting.

3 8 Enable V.23. Required for some

British connections.

664 Disable the remote-access busy

message.

7128 Disable V.32terbo.

S38 0Sets the duration, in seconds, before a forced hang-up and

clearing of the Transmit buffer when DTR drops during an

ARQ call. This is provided to allow time for a remote device

to acknowledge receipt of all transmitted data. Default =

0: The Business Modem immediately hangs up when DTR

drops. If the Business Modem receives the ATH command,

it ignores S38 and immediately hangs up.

S41 0Sets the number of allowable remote-access login attempts,

thus enabling or disabling remote access. The default

setting of zero allows no remote login attempts, thus

disabling remote access. A value of 1 or greater enables

remote access. If the number of unsuccessful login

attempts exceeds the limit set by this register, the Business

Modem returns online and any further login attempts

during the remainder of that connection are refused.

S42 126 Stores the ASCII decimal code for the remote-access escape

character. The default character is a tilde (~).

S43 200 Sets the duration, in fiftieths of a second, of the guard time

for the remote-access (~~~~) sequence.

S51 0Bit-mapped register. See Chapter 1, Using the AT

Command Set, for instructions about how to set

bit-mapped registers.

Bit Value Result

0 1 Disable MNP/V.42 for V.22 (1200 bps)

1 2 Disable MNP/V.42 for V.22bis (2400

bps)

2 4 Disable MNP/V.42 for

V.32/V.32bis/V.32terbo

(9600/14400/19200/21600 bps).

Register Default Function

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