3COM 56K User Manual

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3Com OfficeConnect

56K Business Modem Command Reference

http://www.3com.com/

Published January 1999

3Com Corporation 3800 Golf Rd. Rolling Meadows, Illinois 60008

Copyright © 1999, 3Com 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 3Com Corporation.

3Com Corporation reserves the right to revise this documentation and to make changes in content from time to time without obligation on the part of 3Com Corporation to provide notification of such revision or change.

3Com Corporation provides this documentation without warranty, term, or condition of any kind, either implied or expressed, including, but not limited to, the implied warranties, terms or conditions of merchantability, satisfactory quality, and fitness for a particular purpose. 3Com may make improvements or changes in the product(s) and/or the program(s) described in this documentation at any time.

If there is any software on removable media described in this documentation, it is furnished under a license agreement included with the product as a separate document, in the hard copy documentation, or on the removable media in a directory file named LICENSE.TXT or !LICENSE.TXT. If you are unable to locate a copy, please contact 3Com and a copy will be provided to you.

UNITED STATES GOVERNMENT LEGEND

If you are a United States government agency, then this documentation and the software described herein are provided to you subject to the following:

All technical data and computer software are commercial in nature and developed solely at private expense. Software is delivered as “Commercial Computer Software” as defined in DFARS 252.227-7014 (June 1995) or as a “commercial item” as defined in FAR 2.101(a) and as such is provided with only such rights as are provided in 3Com’ s standard commercial license for the Software. Technical data is provided with limited rights only as provided in DFAR 252.227-7015 (Nov 1995) or FAR 52.227-14 (June 1987), whichever is applicable. You agree not to remove or defac e any portion of any legend provi ded on any licensed pr ogram or documentation contained in, or delivered to you in conjunction with, this User Guide.

Portions of this documentation are reproduced in whole or in part with permission from (as appropriate). Unless otherwise indicated, 3Com registered trademarks are r egistered in the United States a nd may or may not

be registered in other countries. 3Com, the 3Com logo, U.S. Robotics, and OfficeConnect are registered trademarks of 3Com Corporation.

3ComFacts is a service mark of 3Com Corporation. Artisoft and LANtastic are registered trademarks of Artisoft, Inc. Banyan and VINES are registered trademarks

of Banyan Systems Incorporated. CompuServe is a registered trademark of CompuServe, Inc. DEC and PATHWORKS are registered trademarks of Digital Equipment Corporation. Intel and Pentium are registered trademarks of Intel Corporation. AIX, AT, IBM, NetView, and OS/2 are registered trademarks and Warp is a trademark of International Business Machines Corporation. Microsoft, MS-DOS, Windows, and Windows NT are registered trademarks of Microsoft Corporation. Novell and NetWare are registered trademarks of Novell, Inc. PictureTel is a registered trademark of PictureTel Corporation. UNIX is a registered trademark of X/Open Company, Ltd. in the United States and other countries.

All other company and product names may be trademarks of the respective companies with which they are associated.

ONTENTS

BOUT THIS GUIDE

Introduction ........................................................................................ 1

Finding Specific Information in This Guide ............................................ 2

Conventions ......................... ................................................... ............ 2

Related Documentation ....................................................................... 3

Year 2000 Compliance ........................................................................ 3

ONNECTING TO YOUR

Windows 95/98 ................................................................................1-1

What You Need ........................................................................... 1-1

Configuring Your modem with Plug and Play .............................. 1-1

Files Needed By Your modem ...................................................... 1-2

Installing the Latest Software ......................................................1-2

Accessing Your Internet Service Provider ...................................... 1-2

Windows NT 4.0 and Later ............................................................... 1-8

What you need ........................................................................... 1-9

Configuring Your modem ............................................................ 1-9

Setting up RAS ............................................................................ 1-9

Determining if TCP/IP is installed ............................................... 1-10

Installing TCP/IP ............................ ...... ...... ................................. 1-10

Configuring a PPP connection ................................................... 1-10

Configuring a SLIP connectio n ......................... ...... ....... ...... ....... 1-11

Troubleshooting RAS ................................................................. 1-12

Macintosh ...................................................................................... 1-12

Handshaking Cable ...................................................................1-12

System Configuration ................................................................ 1-13

Accessing the Internet ............................................................... 1-13

Macintosh (230K) High Speed script installation ........................ 1-13

Installing the script .................................................................... 1-13

Configuring Open Transport PPP ............................................... 1-14

Selecting the correct TCP/IP settings ..........................................1-15

ISP

Setting up your ISP information .................................................1-16

Other Operating Systems .................. ....... ...... ...... ....... ...... ....... ...... .1-17

If You Are Using Windows 3.x ...................................................1-17

If You Are Using MS-DOS ...........................................................1-17

If You Are Using UNIX, Linux, or AIX ..........................................1-17

SING THE

Overview ..........................................................................................2-1

General rules for using AT commands ..........................................2-1

Basic AT commands .........................................................................2-2

Using S-Registers ..............................................................................2-2

Displaying S-Register settings .......................................................2-3

Setting an S-Register ....................................................................2-3

Getting a list of S-Registers ..........................................................2-4

Understanding bit-mapped S-Registers ..............................................2-4

ODES OF OPERATION

Command and Online Modes ...........................................................3-1

Entering Online Command Mode ................................................3-2

Returning to Online Mode ...........................................................3-2

Controlling Local Echo ...................... ....... ...... ...... ....... ...... ....... ...... ...3-3

Command-Mode Local Echo ........................................................3-3

Online-Mode Local Echo ..............................................................3-3

Data and Fax Modes .........................................................................3-4

IALING

Dialing .................... ................................................................. .........4-1

Dial options .................................................................................4-1

Carrier Loss Redial ....................... ...... ....... ...... ...... ....... ...... ....... ...... ...4-3

Answering Calls ................................................... ....... ...... ....... ......... 4-4

Force Answer Mode .....................................................................4-4

Auto Answer ...............................................................................4-4

Hanging up .................................................................................4-5

Making International calls .................................................................4-5

Handshaking options ...................................................................4-5

Guard tone .. ...... ....... ...... ....... ...... ............................................. ...4-6

AT C

, A

OMMAND SET

NSWERING, AND HANGING UP

Call Detection .................................................................................. 4-6

Caller ID Functions ..................... ....... ...... ...... ................................... 4-7

Service Types ............................................................................... 4-7

Applications of Caller ID Technology ............................................ 4-7

How the Business Modem Handles Caller ID ................................ 4-8

Presentation Formats ...................................................................4-9

Commands ................................................................................. 4-9

References ................................................................................ 4-10

Distinctive Ring Support ................................................................. 4-10

Commands ............................................................................... 4-11

Result Codes .............................................................................4-12

ORKING WITH MEMORY

Overview .............................. ................................................... .........5-1

Working with RAM and NVRAM ................................................. 5-2

Saving a Phone Number to NVRAM .................................................. 5-2

Displaying S-Register Value Information ....................................... 5-3

Saving a Command String to NVRAM ......................................... 5-3

Working with Flash Memory .............................................................5-3

Saving ROM Templates to NVRAM ..............................................5-4

Default Settings ................................................................................ 5-4

ONTROLLING RESULT CODE DISPLAYS

Result Code Display Commands .......................................................6-1

Additional Result Code Subse t s ............................ ...... ....... ............... 6-2

ONTROLLING

Data Terminal Ready ...................................... ................................... 7-1

Data Set Ready ..................... ...... ....... ............................................. .. 7-2

Carrier Detect ................ ....... ............................................. ...... ....... .. 7-3

ONTROLLING DATA RATES

Overview .............................. ................................................... .........8-1

Serial Port Rates ................... ...... ....... ...... ...... ....... ...... ....... ...... ....... .. 8-1

Connection Rates ............................................................................. 8-3

EIA-232 S

IGNALING

Controlling Link Speeds with &N and &U ..........................................8-4

Controlling Link Speeds ...................... ...... ...... ....... ...... ................8-4

Limiting the Highest Possible Connect Speed ...............................8-4

Limiting the Lowest Possible Connect Speed ................................8-5

Limiting a Range of Possible Connect Speeds ...............................8-5

&N and &U Command Values ......................................................8-6

Setting DTE Rate to 230 Kbps ...........................................................8-7

CCESSING AND CONFIGURING THE BUSINESS MODEM

EMOTELY

Overview ..........................................................................................9-1

Setting Up Remote Access ................................................................9-1

At the Host Business Modem .......................................................9-1

Other Remote-Access Commands ................... ....... ...... ....... ...... ...9-3

Accessing the Host ............................................................................9-3

At the Guest Device .....................................................................9-3

Viewing and Changing the Host’s Configuration ..........................9-4

Remote Configuration Commands ...............................................9-5

Quitting a Remote-Access Session .....................................................9-7

IAL SECURITY

Overview ........................................................................................10-1

Setting up Dial Security ...................................................................10-2

Dialback options ........................................................................10-3

Modifying Accounts ...................................................................10-4

Autopass Prompting ....... ....... ...... ....... .......................................10-5

Password Prompting ..................................................................10-5

Maintaining Security Accounts ........................................................10-7

Remote Configuration ...............................................................10-7

What the Guest User Needs to Do ..................................................10-8

Configuring Dial Security Remotely .................................................10-9

LOW CONTROL

Overview ........................................................................................11-1

Hardware and Software Flow Control .............................................11-2

Hardware Flow Control ..............................................................11-2

Software Flow Control .............................................................. 11-2

Received Data Flow Control ............................................................ 11-3

Transmit-Data Flow Control ............................................................ 11-5

ANDSHAKING

HROUGHPUT

Handshaking .................................................................................. 12-1

Selective Reject ......................................................................... 12-1

V.34 .......................................................................................... 12-3

V.90 Capabilities ............................................................................. 12-3

Other Protocols .................................................... ...... ....... ...... ....... 12-3

x2 ............................................................................................. 12-3

Fast Class (V.FC) Handshaking ................................................... 12-3

HST ................................. ................................................... .......12-4

USR V.32terbo to USR V.32terbo ............................................... 12-4

Lower-speed V. Protocols ........................................................... 12-5

Error Control ........................................... ...... ....... ...... ....... ...... ....... 12-5

Error-Control Commands ..........................................................12-5

V.42 Error Control ..................................................................... 12-7

MNP Error Control ..................................................................... 12-7

Error Control and Flow Control ................................................. 12-7

Data Compression ......... ....... ...... ....... ...... ...... ....... ...... ....... .............12-8

V.42bis versus MNP5 Data Compression .................................... 12-8

Getting Maximum Throughput ....................................................... 12-9

Maximum throughput results when: ............................................... 12-9

, E

RROR CONTROL

, D

ATA COMPRESSION, AND

ISPLAYING QUERYING AND HELP SCREENS

Overview .............................. ................................................... .......13-1

Querying .................................................................... .................... 13-1

Displaying Help .............................................................................. 13-3

ESTING THE CONNECTION

Overview .............................. ................................................... .......14-1

Testing the Business Modem using AT&Tn ...................................... 14-2

Analog Loopback Tes ting ..........................................................14-3

Stopping a Test (AT&T0, ATS18) ................................................14-3

Digital Loopback Testing (AT&T3) ...............................................14-5

Remote Digital Loopback Testing (AT&T6, AT&T7) ......................14-6

Granting a Digital Loopback Test Request (AT&T4) .....................14-6

Canceling All Digital Loopback Test Requests (&T5) ....................14-6

Testing Using Keyboard Data (AT&T6) ........................................14-7

Testing Using a Built-in Test Pattern (AT&T7) ...............................14-8

Testing the Business Modem using S-Resister 16 .............................14-9

Analog Loopback (AL) S16=1D ..................................................14-9

Testing Using Keyboard Data (ATS16=8) ..................................14-10

Testing Using a Built-in Test Pattern (ATS16=4) .........................14-11

Ending Testing That Uses the Test Pattern ......................................14-11

ROUBLESHOOTING

Problems That Occur Before Connecting .........................................15-1

No response to AT .....................................................................15-1

The Business Modem won't dial .................................................15-2

Double characters are appearing on your monitor ......................15-3

After you dial, the Business Modem reports NO CARRIER and then hangs up 15-3

Hear ringing but the Business Modem won't answer .................15-3

The Business Modem acts as though a data link has been established, but

no call was received, ..................................................................15-3

The Business Modem behaves as if <Enter> were pressed when you don't

press any keys ............................................................................15-3

Problems that Occur After Connecting ...........................................15-4

Your screen displays random or "garbage" characters ...............15-4

Many CRC errors .......................................................................15-4

Mainframe computer keeps dropping your connection ..............15-5

Bad faxes or can't fax ................................................................15-5

Both devices exchange carrier signals, but fail to establish a

communications link ..................................................................15-5

Errors during software download ...............................................15-6

If You Still Have Problems ...............................................................15-6

PGRADING YOUR MODEM

Overview ........................................................................................16-1

Checking Your Business Modem’s Software Version ........................16-1

Getting New Operating Software .................................................. 16-2

Sending New Software to your modem .......................................... 16-2

If Your Modem Doesn’t Respond .................................................... 16-4

S-R

EGISTERS

Understanding Bit-Mapped S-Registers .............................................A-1

How bits are mapped to decimal values ............................................A-1

Converting Bits to Decimal Values ....................................................A-2

Converting Decimal Values to Bits ....................................................A-2

Setting Bit-Mapped S-Registers .........................................................A-2

Using Bits .........................................................................................A-3

Using Decimal Values .......................................................................A-3

Default S-Register Settings ...............................................................A-3

A complete list of S-Registers ...........................................................A-5

LPHABETIC COMMAND SUMMARY

Basic Command Set ......................................................................... B-1

Ampersand (&) Command Set .......................................................... B-5

Percent (%) Command Set .............................................................B-11

Octothorpe (#) Command Set ........................................................ B-13

LOW CONTROL TEMPLATE

Hardware Flow Control ....................................................................C-1

Software Flow control ......................................................................C-3

No Flow Control ...............................................................................C-4

ESULT CODE MEANINGS AND SETS

Result Code Meanings ......................................................................D-1

Result Codes Sets for Xn Values ........................................................D-2

ECHNICAL INFORMATION

Technical Specifications .................................................................... E-1

Modulation ................................................................................. E-1

Error Control, Data Compression, Testing, and Dialing ................. E-2

Fax .................................. .......................................................... ..E-2

Additional Specifications .............. ....... ...... ...................................E-3

Serial Ports ...................... ....... ...... ....... ...... ...... ....... ...... ....... ...... ...E-3

The EIA-232 Interface .................. ....... ...... ...... ....... ...... ....... ...... ...E-4

Wiring a DB-25 to DB-9 Cable .....................................................E-4

Minimum Requirements ...............................................................E-4

Flow Control Requirements .......... ....... ...... ...... ....... ...... ................E- 5

For Macintosh Computers .........................................................E-5

Serial Ports (Macintosh modem) ............................................... ...... ...E-6

ASCII C

FAX I

Fax Service Class 1 Commands ......................................................... G-1

FAX Service Class 2.0 Commands ..................................................... G-1

Fax Mode Flow Control Setting ........................................................ G-2

FCC Notice ......................................................................................G-2

Notes ............................. ................................ ................................ ..G-2

IEWING

S-R

S-Registers ..................... ................................................................ .... I-1

ARRANTY

3Com Corporation Limited Warranty .................................................J-1

Notices ..............................................................................................J-4

FCC Registration ................................................................................J-4

FCC Notice ........................................................................................J-4

FCC Notice: Radio and Television Interference ....................................J-5

UL Listed Accessory ............................................................................J-6

HART

NFORMATION FOR PROGRAMMERS

LED

EGISTERS

FCC Certification Statement .........................................................J-4

IC (Industry Canada) .....................................................................J-6

LOSSARY

BOUT THIS

UIDE

Introduction

Finding Specific Information in This Guide

This guide is a command reference for the 3Com OfficeConnect 56K Business Modem. It includes information about AT commands, S-Registers and troubleshooting.

If the information in the release notes shipped with your product differs from the information in this guide, follow the instructions in the release notes.

This table shows the location of specific information in this guide.

If you are looking for information about Turn to

Connecting to your ISP Chapter 1 Upgrading Your Busniess Modem Chapter 3 Basic AT Commands Chapter 2 Display Querying and Help Screens Chapter 14 Testing a Connection Chapter 15 Troubleshooting Chapter 17 S-Registers Appendix A Alphabetic Command Summary Appendix B

BOUT THIS GUIDE

Conventions

Table 1 and Table 2 list conventions that are used throughout this guide.

Table 1 Notice Icons

Icon Notice Type Description

Information note Important features or instructions

Caution Information to alert you to potential damage to a

Warning Information to alert you to potential personal injury

Table 2 Text Conventions

Convention Description

Commands

The word “command” means you must enter the command exactly as shown in text and press the Return or Enter key. You may also be as ke d to fi ll in values for variables. Exa mp le:

This guide always gives the full form of a command in uppercase and lowercase letters. However, you can abbreviate comm an ds by e nte ring only the uppercase letters and the appropriate value. Commands are not case-sensitive.

Screen displays

This typeface represents information as it a ppears on the screen.

The words “enter” and “type”

When you see the word “en ter” in thi s guide , you must type something, and then press the Return or Enter key. Do not press the Return or Enter key when an instructio n simply says “type.”

(continued)

[Key] names Key names appear in text in one of two ways:

■

If you must pres s two or more keys simultaneously, the key names are linked with a plus sign (+). Example:

Menu commands

buttons

and

Menu commands or button names appear in italics. Example:

program, system, or device

wait n seconds between losing the connection and redialing:

ATS44=

Referred to by their labels, such as “the Return key” or “the Escape ke y”

Written with brackets, such as [Return] or [Esc].

Press [Ctrl]+[Alt]+[Del].

From the

Help

menu, select

Contents

Table 2 Text Conventions (continued)

Convention Description

Words in type

italicized

bold-face

Italics emphasize a point or denote new terms at the place where they are defined in the text.

Bold text denotes key features.

Related Documentation

Year 2000 Compliance

3Com OfficeConnect 56 K Busin ess Mod em Inst alla ti on Guide

The

should

be used for the installatio n of th e Bu sin e s s Mo de m .

For information on Y ear 2000 compliance and 3Com products, visit the 3Com Year 2000 web page:

http://www.3com.com/products/yr2000.html

BOUT THIS GUIDE

ONNECTING TO

This chapter contains information about configuring your modem for various operating systems.

■

Windows 95/98

■

Windows NT 4.0 and Later

■

Macintosh

■

Other Operating Systems

OUR

ISP

Windows 95/98

What You Need

Configuring Your

modem with Plug

and Play

The first time you start Windows 95/98 after you’ve installed the modem, Windows 95/98 will auto-detect your modem. Since Windows 95/98 supports Plug and Play, most installations are trouble-free.

You must power on your modem before you star t Windows 95/98, or Windows 95/98 will not recognize your modem.

You need Windows 95/98 with Dial-Up Networkin g installed t o configur e your modem for Windows 95/98.

Plug and Play mode allows Windows 95/98 to automatically detect your modem and determine which modem configuration fi le (called an INF file) to use.

Follow the steps below to install the INF file for Windows 95/98:

Power on your computer and start Windows 95/98. Your computer will

detect new hardware. When the

disk provided by hardware manufacturer

This step will install the INF file that is provided on the CD-ROM.

New Hardware Found

window appears, select

and click OK.

Driver from

Connections

1-2

HAPTER

ONNECTING TO YOUR

1: C

ISP

When the following window appears, insert your Connections CD-ROM, change the default drive in

Copy Manufacturer’s files from:

D:\

(or the

correct path of your CD-ROM) and click OK to install the INF file.

Windows 95/98 displays a window asking you to choose your modem type from the list. Sel ect the your modem from the list and click OK.

Your modem is now ready to use!

Files Needed By Your

modem

Installing the Latest

Software

Accessing Your

Internet Service

Provider

For your modem to work most efficiently, 3Com recommends that you use the latest version of the modem software and information (INF) file from the 3Com U.S. Robotics Web site (http://www.usr.com/home/online/).

This file Does this

The modem software Contains software that contains new feature updates The INF file Helps your computer work more effectively with your

See Chapter 3,

Upgrading your M odem

modem

for informat io n a bou t up gr adi ng

your Business Modem’s software.

This section explains how to set up you r mode m to acce ss the I nternet or remote Local Area Networks (LANs) using Windows 95/98 Dial-Up Networking. To Access Internet Service Providers (ISPs) or remote LANs you must do the following:

Windows 95/98

Step One: Determine if Dial-Up Networking is Installed

Click

Start

Settings

Control Panel

1-3

On the Control Pa nel, do uble-click on

Network

. The

Network

widow will

appear.

If Dial-Up Adapter Do this

Is listed Go to the section "Installing TCP/IP Sup port" to install Dial-Up

Is not listed Go to Step 3.

Return to the Control Panel and double-click on

Programs

Click Windows Setup tab.

Double-click on

to open the

Networking.

Add/Remove Programs Properties

Communicatio ns.

Add/Remove

window.

The following window appears:

Click on Dial-Up Networking to check the box.

Click OK | OK.

1-4

HAPTER

ONNECTING TO YOUR

1: C

ISP

Insert your Windows 95/98 Setup diskette or CD-ROM when you are prompted, and Windows 95/98 installs Dial -Up Networking.

Step Two: Installing Dial-Up TCP/IP Support

Click

Start

Settings

Control Panel

On the Control Pane l, double-click on the

Network

Determine if the TCP/IP Dial-Up Adapter is installed:

IF TCP/IP -> Dial-Up Adapter Do this

Is not listed Click

Is listed Go to Step 3.

window:

Add | Protocol | Microsoft | TCP/IP

Insert your CD-ROM when you are prompted, and Windows 95/98 installs TCP/IP protocol support.

Network

Windows 95/98 Setup

to display the

diskette or

Step Three: Setting Up a Connection to Your ISP

Click

Double-click

Select the correct modem, if not already selected.

Type a name for the connection and click

Type a phone number for the connection and click

You should see a message indicating that a new connection was created

Start

Programs

Accessories

Make New Connection

Dial-Up Networking

successfully. Click

Finish.

| OK.

8A New Connecti on

icon will be created in the

Dial-Up Networking

Window. Move your cursor to the new icon yo u have just created and click the right mouse but ton. Select Pr operti es on the menu to di splay the following window:

The following screen may vary slightly depending on the version of Windows 95/98 you are using.

Windows 95/98

1-5

On the

My Connection

following:

■

Log on to Network

■

NetBEUI

■

IPX/SPX Compatible

window , click

Server Type

, and deselect the

1-6

HAPTER

ONNECTING TO YOUR

1: C

ISP

Click

If your ISP Do this

Gives you a specific IP or Domain Name server addresses

Does not give you a specific IP or Domain Name server addresses

, and OK.

Step Four: Customizing TCP/IP Settings

Go to

Double-click on the icon you just created to dial your ISP.

Step Four: Customizing the TCP/IP Settings

Depending on the ISP you us e, you may need to customize the TCP/IP settings. Follow steps 1-6 and if you still cannot connect to your ISP contact you can contact your ISP for specific information such as an IP address or Domain Name Servers (DNS).

Double-click

My Computer

and double-click

Dial-Up Networking

display all the co n ne c tions you can customize. Right-click the icon you created and select

Connection

On the My Connection properties window, click the

properties window.

Properties

to display the

Server Type

tab.

Click

TCP/IP Settings

Windows 95/98

1-7

Specify an IP address, if needed:

If your ISP Do this

Gives you a specific IP address

Does not give you a specific IP address

After you specify an IP Address, specify server assigned name server

Specify an IP address

Click provided by your ISP

erver assigned IP address

Click S

and enter the IP address

addresses, if needed:

If your ISP Do this

Gives you specific name server addresses

Does not give you specific name server addresses

Specify name server addresses

Click server address(es) provided by your ISP

Server assigned server address

Click

and enter the

1-8

HAPTER

ONNECTING TO YOUR

1: C

ISP

Windows NT 4.0 and Later

Double-click your

New Connecti on

icon to connect!

TCP/IP is the main protocol used to transfer data via the Internet. To use TCP/IP with Windows NT, you must connect to your ISP using a PPP or SLIP connection.

Each ISP has different requirements. Before using this chapter to configure Windows NT to acc ess your ISP, contact your ISP to de termine if they have special instructions for Windows NT users.

For you to Use this connection

Use a dial-up connection to connect over the Internet.

SLIP only allows you to connect using IP and does not allow for server assigned IP addresses or server assign name server addresses.

Use a dial-up connection to connect over the Internet.

PPP allows you to connect using IPX, TCP/IP, Netbeui, and other protocols. PPP is a more recent development than SLIP and has become the standard way of connecting to the Internet.

Serial Line Internet Protocol (SLIP)

Point-to-Point Protocol (PPP)

CAUTION:

Before you use these procedures, contact your ISP to

determine if they have any special requirements.

Windows NT 4.0 and Later

1-9

What you need

Configuring Your

modem

Before you begin, obtain the following infor ma tion:

■

Does your ISP have a SLIP or PPP account?

■

Your ISP’s telephone number

■

Does your ISP supply a static or dyn amic IP address?

■

Your ISP's primary and secondary DNS servers

■

INF file for Windows NT

Since Windows NT is not Plug and Play compliant, i t is necessary to instal l the modem in Modem Pr operties.

Your modem should already be installed. If yo u have not connected your Business Modem to your computer, please refer to the Getting Started Manual for installation instructions.

Go to

Click

2 3 4 5 6

Add

Check Click

Click

Have Disk

Place the diskette or CD-ROM that was packaged with your Business

Start

Settings

Control Panel | Modems

Don’t detect my modem; I will select it from a list

Modem into your floppy disk or CD-ROM drive. S elect the INF file found on the disk.

Setting up RAS

Select the COM port for your Business Modem.

When the installation is complete, Windows NT will request that you

restart your comp uter. Select

Right click on the

select

Properties

Click the

Select

Click

Select your Business Modem’s COM port and click OK.

Highlight your Business Modem and click

Select the function of your modem and click OK.

Services

Remote Access Service

Add

Network Neighborhood

tab.

yes

and click

icon on your desktop and

Properties

Configure

1-10

HAPTER

ONNECTING TO YOUR

1: C

8 9

ISP

Click

Network.

Select the protocols required to dial in and out with your Business Modem.

Determining if TCP/IP

is installed

Installing TCP/IP

Set

Encryption Settings

text

Click

Continue

to complete RAS setup.

Allow any authentication including clear

TCP/IP must be instal led befor e you c an access the In ternet. Althoug h this is a standard con fig urat io n, do ubl e-ch eck to m ake su r e T CP/I P is insta lled.

To determine if TCP/IP is installed, perform the following actions: Select

Double-click

On the

TCP/IP Protocol Adapter

If TCP/IP Protocol is listed, skip to section

Start

Network

Protocol

Settings | Control Panel

tab, scan down the list of installed protocols to find

Configuring a PPP Connection

If TCP/IP Protocol is NOT listed move to the next section.

To install TCP/IP, perform the following actions: Select

Double-click

On the

Start

Network

Protocol

Settings

tab, click

Control Panel

, and select the

Add

TCP/IP protocol

list.

from the

Configuring a PPP

connection

To configure the Business Modem for a PPP connection, perform the following actions:

Go to

Click

Select the

Select

Deselect

If you are connecting to an ISP, uncheck

If you are c onnecti ng to an other Windows NT system, Check

Start

New

TCP/IP

NetBEUI

Programs

Server tab

and

Accessories

and select

IPX

Dial Up Networking

in the Dial-up server type box.

PPP

Enable PPP LCP Extensions

Enable PPP

LCP Extensions

Windows NT 4.0 and Later

1-11

Configuring a SLIP

connection

Select

7 8

Enable software compression

Specify an IP address by clicking

If your ISP Do this

Gives you a specific IP addre s s Click

Does not give yo u a specific IP address Click

After you specify an IP Address, specify server assigned name server

TCP/IP setti n g s

Specify an IP address

the IP address provided by your ISP

Server assigned IP address

and enter

addresses, if needed

If your ISP Do this

Gives you specific name server addresses

Does not give you specific name server addresses

Specify name server addresses

Click enter the server address(es) provided by your ISP

Server assigned server addresses

Click

and

The following steps ex plai n ho w to con fig ur e Windows NT fo r us e with a SLIP connection.

Double-click

Click

2 3 4 5 6

New

Select the Click

TCP/IP settings

Enter the IP address provided by your ISP. Enter the primary DNS and secondary DNS server IP addresses in the

Dial-Up Networking

Server tab

and select .

in the Dial-up server type box.

SLIP

appropriate nam e server address boxes. If your ISP requests that you use a specific frame size, select the desired

frame size in the Frame Size bo x.

1-12

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ONNECTING TO YOUR

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ISP

Troubleshooting RAS

RAS is significantly easier to troubleshoot th en Win95 Dial-Up Networking, there are a finite number of problems that one runs into on a daily basis, and the majority of these are caused by misconfiguration. Most connection problems can be solved by following these steps:

■

In the

tab, Make sure that the phone book entry settings a re

Basic

correct.

■

Make sure

■

Make sure to that

■

In the phone book settings, under security, it should be set to:

Use Telephony Dialing Properties

Use another port if busy

any authentication including clear text

■

Make sure only the necessary network protocols are selected. In the

Connect to

window, after you click

■

is unchecked

is not checked.

, there should be no

Dial

domain set. This is on ly for lo gging into NT domain s.

■

Make sure that the TCP/IP settings are correct.

This is a general setup for your Business Modem using Windows NT. If you are having problems connecting to you ISP, configuring Dial-Up Networking, or receiving RAS errors, please contact Microsoft Technical support.

Macintosh

Handshaking Cable

This section explains how to configure your modem for use with Macintosh computers.

There are many ways to configure your Macintosh to use the Internet. Consult your Macintosh documentation for more information.

Use a hardware handshaking cable to connect your modem to the Macintosh.

Macintosh

1-13

System Configuration

Accessing the

Internet

Macintosh (230K) High Speed script

installation

Installing the script

Also, if you aren’t using AppleTalk® Remote Access (ARA), set AppleTalk to Inactive (in Chooser).

The modem initialization string should be

AT&F1&D0

For instructions about how to set up your Macintosh communications software package, see the software installation instructions that came with the software.

Accessing the Internet through an ISP requires the following software:

■

MacTCP or Open Transport (TCP/IP from the Control Panels menu),

which has probably already been installed on your Macintosh

■

SLIP or PPP dialing software

You can find public domain PPP dialers (such as MacPPP, FreePPP) on the Internet.

To enable the 230K DTE support for the Business Modem and 25 mhz Business Modem you first must install the Macintosh (230K) High Speed Script and then configure Open Transport PPP.

Download the

USRARA.HQX

file.

This file can be found on the internet at http://www.usr.c om/home/online/ in the software librar y area. It can also be downloaded from the BBS at 847-262-6000.

After the file is downloaded, it ne e ds to uncom pressed. Wh e n the file is

uncompressed the Inside the USRARA.SE A fo lder i s a r ea dmefi rst.t xt f ile an d the 3C om Hi gh

USRARA.SEA

Folder appears.

Speed script. Move the script file to the following path

create a folder named

Modem Scripts

C:\System\Extensions\

Once you place the script i n th e Modem Scripts folder you will have the option to choose the 3Com High Speed in Open T ransport PPP or ARA.

The script will attempt to talk to the modem at 230.4 port speed and if this fails, it will attempt at the next lowest speed. This will continue until

and

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ONNECTING TO YOUR

1: C

ISP

the script receives an OK back from the modem an d/or the system responds with a proper speed.

Configuring Open

Transport PPP

Selecting the correct modem

Go to

1 2

Apple Menu | Control Panels | Modem

Modems

In the to in the

Window, ch oose the

Connect via

drop down box.

Select the correct modem, in the

port

Modem

that your modem is connect ed

drop down box.

Selecting the correct

TCP/IP settings

Macintosh

1-15

Go to

1 2 3 4

Apple Menu | Control Panel | TCP/IP

TCP/IP

In the Set the

window, select

Configure

in the

PPP

drop down box to

Using PPP Server

Type in your internet service pr ovide rs Domain Name S erver Addr ess(DNS) numbers in the

Name server addr

box.

Leave the other fields emp ty.

Connect via

drop down box.

1-16

HAPTER

1: C

Setting up your ISP

information

ONNECTING TO YOUR

ISP

Go to

1 2 3

Apple Menu | Control Panels | PPP

PPP

In the

window, select

Registered Us er

Type in your Internet Service providers login name and your password in

the name and password boxes. Put the phone number that you dial to connect to your internet provider

in the number box.

You’ve successfully configured Open Transport PPP!

Other Operating Systems

1-17

Other Operat ing Systems

If You Are Using

Windows 3.x

If You Are Using

MS-DOS

This sections exp la i ns ho w to co n figure your modem for:

■

Windows 3.x

■

MS-DOS

■

UNIX, Linux, or AIX

Windows 3.x comes with a built-in communications software package, Windows Terminal. You can use Windows Terminal to test your modem or you can install the communications software package that is included

Connections

on the

CD-ROM.

Because Windows Terminal only supports speeds up to 19200 bps, it is recommended that you use a third-p arty communications software package.

Because there is no communications software built in to MS-DOS, you must install and run a third-party communications software package to operate your modem.

RapidComm, which is incl uded on the

Connections

CD-ROM, contains

MS-DOS and W i nd ows 3.1 versions of Rap id C o m m . You must choose the COM port to which your modem is attached in

whatever communications software package you are using.

If You Are Using

UNIX, Linux, or AIX

For instructions about how to set up your UNIX

, Linux, or AIX communications software package, see the software’s installation procedure.

1-18

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ONNECTING TO YOUR

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SING THE

This chapter includes information about

■

Basic AT commands

■

Using S-Registers

■

Understanding bit-mapped S-Registers

AT C

OMMAND

Overview

General rules for

using AT commands

You can use AT comman ds to change your modem settings at any time. To send AT commands to your modem, you need to put your

communications software in Terminal Mode. In terminal mode, what you type is sent direc tly to the modem.

You must follow some general guidelines to send AT commands to your modem:

■

Type AT before each command and press <ENTER> after each command.

The exceptions are A/, A> and +++, which require neither <ENTER>.

■

Leave zeroes off the end of AT commands. A missing numeric parameter is assumed to be a zero. For example, ATE is equivalent to ATE0.

■

Create compound commands of up to 56 characters between AT and <ENTER>. See the following example.

AT nor

2-2

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2: U

SING THE

OMMAND SET

AT C

AT&K3X2DT5551234

AT Attention; a command follows. &K3 Disable MNP5 data compression; use only V.42 bis compression. X2 Use the X2 result code subset. DT Dial the following number using tone dialing.

Hyphens and parentheses add to the count of 56 characters but, spaces do not.

Basic AT commands

Using S-Registers

The command AT informs the modem that a command is coming. AT must precede all commands except A/, A> and +++.

To configure your modem to Command

Re-execute the last-issued command. Repeat the last- issued command until canceled by pressing

any key.

Example:

Sending

Now, if you send

ATD5551234

the modem will dial 555-1234 again.

will make the modem dial 555-1234.

A/ A>

S-Registers are addresses of places in memory where various timing parameters, redefinitions of selected ASCII characters, and other configuration settings are stored.

Initially, the S-Register settings for each of the NVRAM templates are the same. You can overwrite an S-Register’s stored value. See the default values listed in Appendix A,

S-Registers

, for a complete listing of the

initial settings.

Using S-Registers

2-3

Displaying S-Register

settings

Setting an S-Register

You can display S-Registers in a variety of ways. See the table below for more information.

To display Command

ATSr?

Contents of ONE S-Register

S-Register settings in the NVRAM templates S-Register settings in RAM (the current configuration)

Example:

Sending

ATS0?

, displays the contents or setting for S-Register

, where r is the

ATI5 ATI4

When using the c ommands ATI4 and ATI5, S-Register settings appear a s a table seven columns wide, each entry of the form, "Smm=nnn" where mm is a register number between 0 and 70 and nnn is a decimal value between 0 and 255.

You can configure each S-Register set ting manually.

CAUTION:

If you do not write an S-Register setting with

, the setting

will be retained only until the next reset or power off.

To change Command

Settings for a register in the current configuration

Example

: Sending

ATS0=2

, changes the setting for S-Register 0 to 2. This

ATSr=n

setting will cause th e Bu sine ss Mode m to answer, in Auto Answer Mode, on the second ring.

In the command ATSr=n, r is the register's number a nd n is a decimal value from 0-255 (unless otherwise indicated) that specifies the setting.

2-4

HAPTER

Getting a list of

SING THE

2: U

S-Registers

OMMAND SET

AT C

To display Command

A list of S-Registers

ATS$

In order to issue this command, you must be in Terminal Mode.

See Appendix A, S-Registers for a complete list of S-Registers.

Understanding bit-mapped S-Registers

A bit-mapped S-Register uses one number to describe a collection of settings. Bit-mapping allows us to pack a lot of information in a small space.

Bit-mapped re gi sters are in the form of Sr.b=n, where r is t h e bit -map ped register; .b is the bit; n is 0 (off) or 1 (on).

See Appendix A, S-Registers to see how bits are mapped into decimal values and for information about setting bit-mapped S-Registers.

Command and Online Mode s

ODES OF

This chapter contains information about

■

Command and Online Modes

■

Controlling Local Echo

■

Data and Fax Modes

If you want to Set the modem to Use this command

Control the modem using AT commands.

Your modem set to revert to Command Mode when the Escape Code (+++) is used.

Your modem to Disconnect when the Escape Code (+++) is used.

Return to your connection after an Online Command Mode session.

Send the modem commands while you are on line with another device.

PERATION

Command Mode

Online Mod e

Online Com m and Mode

+++

(Escape Code)

ATS14.0=0

ATS14.0=1

ATO0

+++

(Escape Code)

DO NOT type

before

+++

<ENTER>

after the command

3-2

HAPTER

ODES OF OPERATION

3: M

Entering Online

Command Mode

Returning to Onli ne

Mode

When the modem is in Online Mode, the only command it recognizes is an escape code, or +++.

Revert to Command Mode without losing connectio ns by sending

ATS14.0=0

Wait one second after sending the last item of data

+++

Type

Wait for

to the modem before establishing your connection.

to appear before typing any data

You can change the characters used to revert to Command Mode or the wait time by resetting Register S2 or S12. For more information about resetting these S-Registers, see Appendix A, S-Registers.

There are tw o ways to return online using the A TOn command.

If you want to Command

Return online Return online and retrain

Example:

Sending

ATO1

, will allow you to resynchronize if you

ATO0 ATO1

experienced errors during a non-ARQ data transfer.

Controlling Local Echo

3-3

Controlling Local Echo

Command-Mode

Local Echo

Online-Mode Local

Echo

There are two local echo settings, one for Command Mode and one for Online Mode.

You can configure your modem to display the commands you type on screen by using the ATEn command

If you want the commands you type to Command

NOT appear on screen (Command Mode echo OFF) Appear on your screen (Command Mode echo ON )

ATE0 ATE1

Although you cannot see the command when you set ATE0, the modem is receiving them .

To configure your modem to di splay a copy of data that is being transmitted on your screen you can use the ATFn comma nd.

As the modem transmits data to a remote system Command

The modem sends a copy of the data to the screen. Online local echo ON (“half duplex”).

No copy of the data is displayed on s cree n. Onl ine ec ho OF F (“full duplex”).

ATF0

ATF1

(default)

ATF0

Example:

Sending

will allow you to see what you are typing in the

display window.

You may see the term duplex used in place of online local echoing, although the term is not technically accurate.

3-4

HAPTER

ODES OF OPERATION

3: M

Data and Fax Modes

Once you are in Command Mode, you can initia lize the modem in Data or Fax mode.

Fax operatio ns req ui re facsimile-compa tib le communication s so ftw a re that can send or rece ive Grou p III faxes. Fo llow the instr uctions in yo ur fax software manual.

The modems default operating mode is Data Mode. Most fax software automatically switches the device to Fax mode when you run the program, and resets the device to Data mode when you exit the program

If you want the modem prepared to Mode Command

Make calls to and receive calls from other modems

Make calls to and receive calls from analog facsimile devices, such as fax modems and fax machines

Example:

Sending

AT+FCLASS=1

, allows you to receive faxes from fax

Data Mode

Fax Mode

AT+FCLASS=0

AT+FCLASS=1

(Class 1 Fax Mod e) or

AT+FCLASS=2.0

(Class 2.0 Fax Mode)

machines.

Class 1 and Class 2.0 Fax Modes refer to standards set by the Electronic Industries Association/Telecommunications Industry Association. Class 1 Fax Mode is the minimal standard for computer-faxmodem interface. Class 2.0 Fax Mode refers to the extended computer-faxmodem interface.

Data and Fax Modes

3-5

If you are not sure whether your modem is in D ata or Fax mode, use the

AT+FCLASS?

command

If the modem returns a value of

0 Data Mode 1 Class 1 Fax Mode

2.0 Class 2.0 Fax Mode.

This indicates

Whenever the modem is reset using the ATZ command or by turnin g the power off and then on, it will reset to Data Mode.

3-6

HAPTER

ODES OF OPERATION

3: M

IALING

, A

NSWERING, AND

Dialing

Dial options

ANGING

This chapter explains how to use basic AT commands for:

■

Dialing

■

Carrier loss redial

■

Answering calls

■

Making International calls

■

Call detection

■

Caller ID functions

■

Distinctive Ring support

Y ou can use your modem to dial the spec ified ph one numb er and exe cute dial options by using the following commands.

For your modem to Command

phone number

ATD

Dial the specified phone number and execute dial options (DO NOT use spaces or dashes).

Tone dial. Pulse dial. Pause for the length of time specified by S-Register 8.

The default is 2 seconds. Pause for 125 milliseconds. Wait for a second dial tone before continuing dialing. This command only works only if the X3 (or higher)

command has been issued (see Chapter 7,

Result Code Displays Meanings and Sets

it interprets the W as a two-second pause, unless it detects a second dial tone within two seconds.

and Appendix D,

). If the modem is set to X2 or lowe r,

Controlling

Result Code

ATDT ATDP ATD,

ATD/ ATDW

(Comma)

(Slash)

4-2

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4: D

IALING

NSWERING, AND HANGING UP

, A

For your modem to Command

Wait for an answer (with X3 or higher).

ATD@

Some online services answer the phone and return a tape-recorded request for information before processing transactions.

Use the AT@ command to tell the modem to detect at least one ring, wait for five seconds of silence at the other end of the call, and then continue.

To use the AT@ command, set the modem to X3, X4 or X7.

If set X2 or lower, the modem will return an ERROR message when it encounters the @ character. If set to X5 or X6, the modem hangs up w he n it de tect s a vo ic e answer.

ATD; ATD"

(Semicolon)

Return to Command mode after dialing. Dial the letters that follow (in an alphabetical phone

number).

If you are including another command after the phone number, use closing quotation marks before the additional command

IMPORTANT:

With the exception of the above Dial options, your modem will

ignore any commands issued after the D in the same command string.

Call a device that can only originate calls. It forces the

ATDR

modem to dial out at the answer frequency or Reverse frequencies. You can put the R either before or after the number.

Display different sets of result codes. See Chapter 6,

Controlling Result Code Displays Result Code Meanings and Sets

and Appendix D,

Dial the last-dialed number. Use ATDL instead of using

ATX2D..... X7D

ATDL

A/ if you wish to send the modem non-Dial commands before dialing again.

Display the last-dialed number. Dial the number stored in nonvolatile random access

ATDL? ATDS

memory at position n, where n = 0*9. See Chapter 6,

Working with Memory

, for instructions about saving

phone numbers to memory. Digits 0 through 9, * and # are accepted. Stop dialing or stop repeating. Type any key Reissue the last command (Don’t type AT or press

<ENTER>

Carrier Loss Redial

For your modem to Command

Dial a number, wait 60 seconds for a connection, and then hang up. Wait two seconds, then redial. Make a maximum of 10 attempts.

To stop the repeating, press any key during the pause between dial attempts. If you press any key while the modem is dialing, that dial attempt is canceled but the cycle will contin ue

Dial the last-dialed number and repeat it just as the > command does. Also can be used to repeat any command.

4-3

Carrier Loss Redial

You can set the Business Modem to redial the last-dialed number after it loses carrier (carrier is the signal maintained between two modems while they are on line) . This feature is useful for dialed-line connections that operate unattended.

For your modem to Command

Disable carrier loss redial Enable carrier loss redial Wait n seconds between losing the connection and

redialing. This command also defines the interval (in seconds)

between dialing attempts in the that the first attem pt is not successful.

Example:

Sending

ATS44=20

sets a 20-second interval between losing

ATS69.1=0 ATS69.1=1 ATS44=

the connection and redialing.

4-4

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4: D

IALING

NSWERING, AND HANGING UP

, A

Answering Call s

Force Answer Mode

Auto Answer

Your modem can be configured to answer calls. By de fault, your Busi ness Modem will not automatically answers calls.

For your modem to Command

Go through the answer sequence when it hasn't received an incoming call

Or Manually ans wer a call

ATA

You can set your modem to Auto Answer us ing the ATS0 command

For your modem to Command

Receive calls unattended (Auto answer enabled) Remember to set your communications software to

save incoming messages and/or files. NOT receive calls unattended (Auto answer disabled)

Example:

Sending

ATS0=0

will not allow your modem to receive calls

ATS0=1

modem to answer on the first ring)

ATS0=0

(this instructs the

when you are not present. See the S-Register summar y in Appendix A,

S-Registers

for more

information about instructin g the mo d em to answe r afte r more than 1 ring.

When your modem senses a call coming in, it send s the re sult code RIN G to your computer, goes off hook, and negotiates for a connection. If there is no response within 60 seconds, the Business Modem hangs up.

For more information about adjusting the 60-second wait-for-connection time using S-Register 7, see Appendix A,

S-Registers.

When a call is disconnected, the Business Modem hangs up and returns the NO CARRIER result code.

If S0=0, Auto Answer is disabled. To determine if Auto Answer is NOT disabled send the command

and be sure that S0=1-255.

ATI4

Making International cal ls

4-5

Hanging up

Making International calls

Handshaking options

If you want to end a connecti on with a remote device do t he following: Enter Online Command Mode by t y ping

Wait 1 second

ATH

Type

+++

You can use the ATBn, AT&Gn and ATPn commands for making analo g international calls above 1200 bps.

The ATBn command controls the handshake options.

If you want your modem Command

ATB0

To answer all V.34-type calls, as well as calls fr om overseas, use ITU-T (formerly CCITT) answer sequence.

NOT to answer V.34-type calls. Use Bell answer tone. This setting selects HST modulation.

Example:

Sending

ATB1

, will allow your modem to use Bell answer tone

(Default)

ATB1

(selecting HST modulation).

4-6

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4: D

IALING

NSWERING, AND HANGING UP

, A

Guard tone

The AT&Gn command only applies to analog overseas calls at 2400 or 1200 bps.

To set your modem for Command Required in these countries

No guard tone

550-Hz guard tone 1800-Hz guard tone

If you set &G2 you must also send

AT&G0

(Default)

AT&G1 AT&G2

United States and Canada

Some European countries The U.K. and some Comm onwealth

countries

to the modem. This setting

ATB0

allows the Business Modem to answer all calls from overseas.

Make/Break Ra tio The A T&Pn command sets the off- hook/on-hook (make/break) interval for

pulse dialin g.

To set you modem for Command

North American make/break ratio (39/61) United Kingdom make/break ratio (33/67)

AT&P0 AT&P1

Call Detection

Call Detection allows the modem to recognize whether an incomin g call is analog data or fax.

Call Detection is an optional Service Class 2.0 feature and is also implemented by 3Com for Fax Class 1 applications.

Caller ID Functions

4-7

Caller ID Functions

Service Types

Caller ID is a service provided by local telephone companies. When you subscribe to caller ID, your phone company begins providing you real-time information about incoming calls.

The caller ID signal includes the date and time of the call, the phone number of the calling device, and, optionally, the name of the calling party. The signal is sent between the first and second rings and must be decoded and displayed by a device connected to your phone line. The Business Modem has the ability to decode and display t he caller ID information.

You can subscribe to Basic or Extended caller ID service. Basic service offers you the date and time of the call and the calling party’ s telephone number. Extended service provides the billing name associated with the calling party’s telephone number in addition to the Basic service information.

The information the Business Modem actually receives depends on the service type to which you’ve subscribed, the information that the calling party’s telephone company provides, and whether the equipment in between supports caller ID. At mini mum, you wil l always r eceive the date and time that a call arrived.

If a call arrives without a caller ID signal, the modem will send OUT OF AREA in place of the pho ne number and name. If the caller ID information has been bl ocked by the user at the other end, the Business Modem will send PRIVATE in place of the phone number and name.

Applications of Caller

ID Technology

You can use caller ID to screen calls, keep a record of calls, or prevent unauthorized access to your network. Third-party database and telephony applications such as security, call logging, and black-listing applications exploit the caller ID information provided by the Business Modem.

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4: D

IALING

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, A

How the Business

Modem Handles

Caller ID

When the modem receives the caller ID signal, it stores the information in memory. You can access the information at any t ime b y se ndi ng

ATI15

the modem.

ati15

3Com OfficeConnect 56K Business Modem CID Status…

80 1E 01 08 31 30 31 35 32 30 33 38 02 0A 37 30

38 35 35 35 30 30 30 31 07 0C 55 2E 53 2E 52 4F

42 4F 54 49 43 53 22

DATE = 1015

TIME = 2038

NMBR = 8475550001

NAME = U.S.ROBOTICS

Using the #CID command (described below), you can have the Business Modem send the information to your computer between the first and second RING messages. The call er ID information is displayed only once.

RING

DATE = 1015

TIME = 2038

NMBR = 8475550001

NAME = U.S.ROBOTICS

RING

The information r emains in memory until either you reset the modem or until it receives ano the r va l id ca lle r ID sig na l .

To be sure that the Business Modem receives the call er ID signal when auto-answer is enabled, set S0=2 or higher or make sure your communications softwar e is set to answer on 2 or more rings.

Caller ID Functions

4-9

Presentation Formats

The Business Mod e m s e nd s the ca lle r ID in fo rm ati on to your computer formatted or unformatted. Formatted presentation is a translation of the caller ID signal into ASCII text. Unformatted presentation is a hexadecimal representation of the caller ID signal.

An Example of Formatte d caller ID presentation:

RING

DATE = 1015

TIME = 2038

NMBR = 8475550001

NAME = U.S.ROBOTICS

RING

An Example of Unformatted caller ID prese ntati on :

RING

Commands

801E01083130313532303338020A37303835353530303031070C552E532E 524F424F5449435322

RING

The following table describes the AT#CID=n settings.

Caller ID Action Command

Disable Caller ID detection and reporting

Enable Caller ID with formatted output Enable Caller ID with unformatted output

AT#CID=0

(Default)

AT#CID=1 AT#CID=2

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, A

Caller ID Action Command

Enable Caller ID with formatted outpu t an d na me suppressed

Enable Caller ID but do not transmit the information to your computer—retain it in the Business Modem’s memory

Display the current caller ID setting. Display the Caller ID settings that are available

AT#CID=3

AT#CID=4

AT#CID? AT#CID=?

References

Distinctive Ring Support

For more information about Calling Number Delivery (CND), refer to Bellcore do cuments TR-TSY-000030 and TR-TSY-000031. To obtain Bellcore documents, contact:

Bellcore Customer Service 8 Corporate Place Room 3A184 Piscataway, NJ 08854-4196 (800)521-2673

Distinctive ring is a service provided by local telephone companies that permits the assignment of multiple phone numbers to one line. Each phone number is associated with a different ring pattern, and devices that recognize distinctive ring, like the Business Modem, can be set to answer only on certain incoming ring patterns.

For example, a fax machi ne, answer ing machi ne, t eleph one , an d modem could all share t he same line. Each device would have its own phone number and respon d only to calls intended for that number.

Distinctive Ring Support



4-11

There are four ring patterns in common use:

Ring Description

A 1.2 to 2.0 seconds on, 4.0 seconds off. B 0.8 second on, 0.4 second off, 0.8 second on, 4.0 seconds off. C 0.4 second on, 0.2 s e co nd off, 0.4 second on, 0.2 second off, 0.8 s e co nd

on, 4.0 seconds off.

D 0.3 second on, 0.2 s e co nd off, 1.0 second on, 0.2 second off, 0.3 s e co nd

on, 4.0 seconds off.

These are graphical depictions of each ring pattern.





Commands



For your modem to Command

Enable recognition of Ring A Disable recognition of Ring A Enable recognition of Ring B Disable recognition of Ring B Enable recognition of Ring C Disable recognition of Ring C Enable recognition of Ring D Disable recognition of Ring D

Example:

Sending

ATS70.0=1.3=1

ATS70.0=1 ATS70.0=0 ATS70.1=1 ATS70.1=0 ATS70.2=1 ATS70.2=0 ATS70.3=1 ATS70.3=0

to your modem enables the

recognition of ring types A and D only .

4-12

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4: D

Result Codes

IALING

NSWERING, AND HANGING UP

, A

When a call comes in with a ring type A or D, the Business Modem will send the result co de RING A or RING D, r especti vely. The Business Modem will ignore other ring types.

If S70 is set to 0 (the default) the Business Modem detects ring types A and B, sending the result code RING for either ring type. This function is identical to that of other 3Com modems that do not support distinct ive ring.

If only one ring type is ena bled, the Business Mo de m wi ll reco gn iz e onl y the enabled ring ty pe and ignore all others. It will sen d the resul t co de RING only when it detects the r ing type that's enabled.

If more than one ring type is enabled, the Business Modem will recognize only the enabled ring types and ignore the others. When a call arrives, the Business Modem will send its ring type in the result code, for example, RING C.

Verbal Numeric

RING A 170 RING B 171 RING C 172 RING D 173

ORKING WITH

This chapter contains information about:

■

Saving a phone number to NVR AM

■

Working with Flash Memory

You can upgrade the software held in Flash memory by perfo rming a software download.

information about performing a software downloads.

See Chapter 3

EMORY

, Upgrading your Software,

for more

Overview

Business Modems contain three types of memory that you can interact with: random access memory (RAM), nonvolati le random access memo ry (NVRAM), and Flash memory.

Memory type Applies to Loss of power will Command

RAM The current settings. Cancel any changes you

make. To save settings before resetting the modem, use &W. See the section

NVRAM Saved settings (any

configurations you can store, retrieve, and change).

Flash Three templates of

permanent settings (the Business Modem’s operating software).

Working with RAM

detailed information. NOT affect your settings.

NOT affect your settings. You can retrieve the permanent settings, and save them to NVRAM, but you cannot alter them.

for more

ATI4

ATI5

Not applicable.

5-2

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ORKING WITH MEMORY

5: W

Working with RAM

and NVRAM

Saving a Phone Number to NVRAM

Example:

Sending

ATI5

will display NVRAM settings on your screen.

To see a complete listing of the permanent settings stored in Flash memory see

Appendix C

, Flow Control Templates.

You can change any setting just for the current session. For example

AT&N8

setting your Business Modem to

will only allow a connection to a remote devices at a rat e of 14400 bps un til the modem is re set. Once the modem is reset, the default variable conne ctio n rate wil l be re-established.

If you want the new setting to be a de fa u lt, write it t o NVR AM at the same time. From the example above, you would send

AT&N8&W

to the modem. The new default setting for your Busi ness Modem will only allow a 14400 bps connection to a remote device.

To restore NVRAM factory defaults use the AT&Fn command. See Appendix B,

Alphabetic Comman d Summary

, for more information on

setting &Fn.

For your modem to Command

Write the phone nu mb er (s) to a position (n) in memory. You can store up to 10 phone numbers of up to 40 characters each in positions 0-9.

Display the number stored in the last-dialed number buffer Display the phone nu mber s tor ed in NVRAM a t posit ion n, where

n = 0*9.

AT&Zn=

ATDL? AT&Zn?

CAUTION:

Example:

AT&Z2=555-6789. ATDS2

Do not include modem commands in

To store the phone number 555-6789 at position 2, type

AT&Zn=

If you want to dial the phone number you saved, type

Displaying S-Register

Value Information

Working with Flash Memory

5-3

If the call requires a special setting, insert it in the command before the DSn command. In this e x ample, &M0 (no error control) comes before DS2. Type:

AT&M0DS2

The AT&Zn=s command functions differently when Dial Security is enabled. See Chapte r 11,

For your modem to Command

View the contents of a particular S-Register

Dial Security

, for more in formation.

ATSr?

(where r is the number

of the S-Register)

Saving a Command

String to NVRAM

Working with Flash Memory

Example:

Sending

ATS0?

will allow you to view the contents of Register

S0.

For your modem to Command

Store a command string in NVRAM. The command string can be up to 30 characters long; spaces do not count. This command is used so that you can call another modem without loading your communications software.

Display the stored command string

AT&ZC=

AT&ZC?

string

The Business Modem permanently stores three configuration "templates," or prepared sets of commands, in Flash memory. You can use the &Fn command to load on e of the three configuration templates from Flash memory into current memory.

To load this configuration template into c u rrent memory Command

No flow control (low performance). Hardware flow control. Software flow control.

AT&F0 AT&F1 AT&F2

Example:

Sending

AT&F1

to your modem will load the Hardware Flow

Control Template into RAM Memory.

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ORKING WITH MEMORY

5: W

Saving ROM

Templates to NVRAM

Default Settings

All of the settings in each template are given in Appendix C,

Flow Control

Templates.

For more information about hardware and software flow control, See Chapter 12,

Flow Control

To save one of the three ROM templates to NVRAM and have it serve as the reset default, enter

AT&Fn&W

When the Business Modem is turned on it loads the setti ngs stored in NVRAM. By default, these settings are that same as the &F1 template.

You can save any of the three templates, or save modifi ed versions of them, in NVRAM for use as power-on defaults.

For your modem to Command Example

Display NVRAM settings (&F1 settings) Substitute a template (other than &F1)

Save modified versions of the settings to NVRAM

ATI5 ATI5 AT&F2&W

(Default)

AT&F2&W

&W ATS10=40&A2&W

See Appendix C, default values.

Flow Control Templates

for a complete listing of the

ONTROLLING

ESULT

ODE

Result Code Display Commands

ISPLAYS

This chapter contains information about:

■

Result Code Display commands

■

Additional Result Code subsets

The commands listed below control whether result codes are displayed, and in what format they are displayed

If you want the modem to Command

Display result codes. NOT display result codes. NOT display result codes while in Answer mode. See Chapter

Modes of Operation

4, Display result codes in numeric form. Display result codes in verbal form. Display result code s when originating, answering, and

retaining a ca ll. Display result code s ONLY when originating a call Display sets of result codes. See Appendix D,

and Meanings

, for a description of modes.

Result Code Sets

ATQ0 ATQ1 ATQ2

ATV0 ATV1 ATS14.1=0

ATS14.1=1

ATX

(Default ATX7)

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ONTROLLING RESULT CODE DISPLAYS

6: C

Additional Resu lt Code Subsets

ARQ (Automatic Repeat Request) is used in this manual to denote calls that use error control.

For your modem to Command

Display only connection rate. Display connection rate and ARQ result codes. Display connection rate, ARQ result code, and protocol

information (V32, VFC, V34, or x2/v.90). If your software cannot handle the added protocol information, select &A1 or &A0.

Display connection rate, ARQ result code, protocol, error control (LAPM, MNP, or NONE), and da ta- comp ression type (V42BIS, MNP5) indicators.

AT&A0 AT&A1 AT&A2

AT&A3

(Default)

The numeric identifiers for &A3 result codes are the same as those used for &A2. If you r equest numeric display (V0) and &A3, you won’t be able to distinguish &A2 from &A3 codes.

ONTROLLING

EIA-232

Data Terminal Ready

IGNALING

This chapter contains information about configuring the EIA-2321 signalling between your computer and modem:

■

Data Terminal Ready

■

Data Set Ready

■

Carrier Detect

Your computer sends a Data Terminal Ready (DTR) signal to the Business Modem when it is ready to send and receive data. The &Dn command tells the modem how to respond to the DTR signal.

For your modem to Command

Ignore the state of DTR and act as if DT R is always presen t. Use this command with equipment that cannot provide DTR.

If issued Command Mode during a call by dropping DTR. Most communications software packages have a method for toggling DTR. Refer to your software’s manual for details.

Respond nor mally to the DTR signal. The Business Modem will not accept commands until your

computer sends a DTR signal. The call will end when the DTR signal is dropped.To change the DTR recogn ition time, set S-Register 25. See Appendix A, information.

Business Modem hangs up and resets upon loss of DTR signal.

before connecting with another device

S-Registers

for more

, enter online

AT&D0

AT&D1

AT&D2

AT&D3

Example:

dropping DTR will enter Command Mode.

Sending

1.The EIA-232 Standard was formerly known as RS-232 (RS stands for Recommended Standard).

AT&D1

before connecting with another device,

7-2

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7: C

ONTROLLING

EIA-232 S

IGNALING

Data Set Ready

Under normal conditions, the Business Modem sends a Data Set Ready (DSR) signal to your computer when it is ready to send and receive data.

CAUTION:

Do not change the default se tting of &S0 unless you know that your installat ion requires a different setting. Few Windows communications programs, if any, will require the Business Modem to control DSR (&S1).

Use the following command to control how the modem sends the DSR signal.

For you modem Command

To send the DSR signal at all times. When originating a call, to send the DSR signal after dialing

when the Business M ode m de tect s th e re m ote analog device’s answer tone

When answering a call, to send DSR after the Business Mod em sends its answer tone.

After sending Carrier Detect (CD), to send a pulsed DSR signal, followed by a Clear to Send (CTS) signal. Use this option for specialized equipment such as automatic call back units.

After sending Carrier Detect (CD), to send a pulsed DSR signal. To send a DSR signal to your computer at the same time the

Business Modem sends the CD signal. To send DSR normally (with CTS) after sending CD. In order to change the DSR pulse time (in 20-second

increments), set S-Register 24. (See Appendix B,

Command Summary

Alphabetic

AT&S0 AT&S1

AT&S1

AT&S2

AT&S3 AT&S4

AT&S5

(Default)

Example:

Issuing

AT&S3

configures the Business Modem to send a

pulsed DSR signal after sending the Carrier Detect (CD) signal.

Carrier Detect

7-3

Carrier Detect

Carrier means there is communication with the device on the other end of the connection. Under normal conditions, the Business Modem sends a Carrier Detect (CD) signal in response to establishing a connection with another modem. You can use the AT&Cn command to control how the Business Modem sends the CD signal.

For your modem to Command

Have CD always ON. Send CD normally (the Business Modem sends a CD signal

when it connects with anothe r device, and drops the CD sign al when it disconnects).

AT&C0 AT&C1

7-4

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7: C

ONTROLLING

EIA-232 S

IGNALING

ONTROLLING

This chapter contains information about

■

Serial port rates

■

Connection rates

■

Controlling Link Speeds with &N and &U

■

Setting DTE Rate to 230 Kbps

ATA

ATES

Overview

Serial Port Rates

You can set the Business Modem to use fixed or variable serial port rates and fixed or variable connection rates. Serial port rates pertain to data transferred between your computer and the Business Modem. Connection rates pertain to data transferred between the Business Modem and the device at the other end of a connection.

You set a fixed serial port ra te to get the hi ghest p ossible thr ough put and the best performance . Set a variab le rate to all ow the Busi ness Mod em to match the connection rate.

Your software must support fixed or variabl e serial po rt rates.

8-2

HAPTER

ONTROLLING DATA RATES

8: C

Your software may use terms such as locked serial port (fixed rate) or autobaud (variable rate).

To allow your modem

To change its serial port rate to match the connection rate.

To always communicate with an attached device at the rate at which you have set the terminal or software, regardless of the connection rate.

For the greatest throughput, set the serial port to 115200, 57600, or 3 8400 bp s for high-speed calls, a nd to at l east 9600 bps for 2400-bps calls.

To shift its serial port rate to a rate that you specify using your communications software (for example, 38.4 Kbps) when the Business Modem connects in ARQ mode.

If the connection is not under error control, the Business Modem behaves as if it was set to &B0 and switches its serial port rates to match the connection rate of each call.

To implement this feature, first set your software to the desired rate. Then send

AT&B2&W

The Business Modem stores the rate of the command in NVRAM along with the current settings. The Business Modem checks NVRAM for the specified serial port rate each time it makes an ARQ connection.

When saving s ubsequent configurations to NVRAM, be sure your software is set to your selected serial port rate so the correct rate is maintained.

to the modem.

Set the serial port rate as

Variable

Fixed

Fixed for ARQ calls

and

Variable for non-ARQ calls when answering only.

See Chapter 13,

Compression, and Error Control, for more information about ARQ

Command

AT&B0

AT&B1

(Default)

AT&B2

Handshaking, Data

The serial port rate MUST be equal to or higher than the Connection rate (&Nn).

Connection Rates

8-3

Connection Rates

Y ou can set the Business Modem to a fixed or variable connection rate for data calls. Set a variable rate to have the Business Modem negotiate with the remote device for the highest possible connection rate. Set a fixed rate to connect only at a specified rate. Yo u might use a fixed rate to filter calls for security or other reasons.

To allow your modem to Set connection rate as Command

Negotiate for the highest po ssible rate. Variable Connect only if the remote device is

operating at the rate you specify. See below.

To connect at this rate

300 bps 1200 bps 2400 bps 4800 bps 7200 bps 9600 bps

12.0 Kbps

14.4 Kbps

Command

AT&N1 AT&N2 AT&N3 AT&N4 AT&N5 AT&N6 AT&N7 AT&N8

Fixed

To connect at this rate

16.8 Kbps

19.2 Kbps

21.6 Kbps

24.0 Kbps

26.4 Kbps

28.8 Kbps

31.2 Kbps

33.6 Kbps

AT&N0 AT&N1-AT&N16

Command

AT&N9 AT&N10 AT&N11 AT&N12 AT&N13 AT&N14 AT&N15 AT&N16

AT&N8

Example:

Sending

will only allow connections with r emote devices

that are oper ating at 14.4 Kbps.

8-4

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ONTROLLING DATA RATES

8: C

Controlling Link Speeds with &N and &U

Controlling Link

Speeds

Limiting the Highest

Possible Connect

Speed

You can use the &N and &U commands to control link speeds.

Use the following table to determine how to use &N and &U commands:

To limit the Use

Highest possible connect speed Lowest possible connect speed Range of possible connect speeds

AT&N AT&U AT&N

and

AT&U

The default values for &N and &U are 0. If you change these val ues, you will limit the speeds at which you can connect. 3Com recomm ends that you do not alter these values.

The &N command, when used in conjunction with the &U command, allows you to limit the highest possible connect speed. If a remote modem attempts to connect to your Business Modem at a speed higher than &N, your Business Modem will not allow it to connect .

To limit the Use this command Where x i s

Highest possible connect speed

AT&N=x

A value from 0 to 32

For a complete list of conne ct spe eds, se e the table in se ction

Command Values

&N and &U

Controlling Link Speeds with &N a n d &U

8-5

Limiting the Lowest

Possible Connect

Speed

Limiting a Range of

Possible Connect

Speeds

The &U command allows you to li mit the lowest possible connect speed. If a remote modem attempts to connect to your Business Modem at a speed lower than &U, your Business Modem will not allow it to connect.

To limit the Use this command Where x i s

Lowest possible connec t speed

See the table in the sectio n

AT&U=x

A value from 0 to 32

&N and &U Command Values

for connect

speed values.

By setting &N and &U values, you can limit the range of speeds at which your Business Modem connects. If a remote modem does not connect to your Business Modem at a range betw een the speeds designated by the &N and &U commands, your Business Modem will not allow it to connect.

The link speed associated wit h t he &U argument CANNOT be grea ter than the link speed associated with &N argument.

Use the following table to understand the relationship between &U and &N commands:

If &U And &N Then your modem

Equals zero Equals zero Connects at the highest possible

speed. Equals zero Is greater than zero Connects at the &N speed only. Is greater than zero Is greater than zero and

greater than &U

Connects at the highest possible

speed in the range from &U to &N.

8-6

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ONTROLLING DATA RATES

8: C

&N and &U Command

Values

Use the following tabl e for a complete list of &N and &U link speeds and their associated indexes:

Link Speed Index

Highest 0 300 1 1200 2 2400 3 4800 4 7200 5 9600 6 12000 7 14400 8 16800 9 19200 10 21600 11 24000 12 26400 13 28800 14 31200 15 33600 16 28000 17 29333 18 30666 19 32000 20 33333 21 34666 22 36000 23 37333 24 38666 25 40000 26 41333 27 42666 28 44000 29 45333 30

Link Speed Index

46666 31 48000 32 49333 33 50666 34 52000 35 53333 36 54666 37 56000 38 57333 39

Setting DTE Rate to 230 Kbps

8-7

Setting DTE Rate to 230 Kbps

The DTE rate of your Bu sin ess Mo dem has be en i nc r ease d to 2 30 kbp s t o enhance throughput.

This command is only support ed on Business Modems attached to high speed serial cards.

8-8

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ONTROLLING DATA RATES

8: C

CCESSING AND

ONFIGURING

Overview

THE

This chapter contains information about:

■

Setting up remote access

■

Accessing the host

■

Quitting a remote access session

You can set up the Business Modem so other devices can view or change its configuratio n remo tel y.

You should be familiar with these terms before you continue:

Local The device that is directly con nected to the computer

Remote The device at the ot her end of a telephone connection. Host The Business Modem that will be accessed and

Guest The device that will access and control the host

USINESS

ODEM

you are using.

controlled by other devices.

Business Modem.

EMOTELY

Setting Up Remote Access

At the Host Business

Modem

Prepare to sen d AT commands by putting your communications sof twar e

in Terminal Mode.

9-2

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CCESSING AND CONFIGURING THE BUSINESS MODEM REMOTELY

9: A

Enable remote access.

Set Register S41 f or a val ue of 1 or g r e ater. S41 sets t he numb er of l og- in attempts available to the remote user. A setting of zero allows no log-in attempts disabling remote access.

Example:

Sending

ATS41=1&W

allows for 1 log-in attempt by a remote

user. Set one or two remote-access passwords.

You can set tw o pa ss w o rds to al lo w different leve ls of ac ce s s to eac h Business Modem

Use this command to assign a

To allow guest users to

View

the Business Modem’s configuration.

View

configuration.

Example:

the password

and

change

the Business Modem’s

Sending

AT%P1= corn

corn

. The user can view and change the Business Modem’s

will allow a remote user to log-in with

remote-access password

AT%P0= AT%P1=

password password

configuration.

Remote-access passwords can be up to eight alphanumeric characters long, and are not case-sensitive

Accessing the Host

9-3

Other Remote-Access

Commands

Accessing the Host

At the Guest Device

The table below is a list of remote-access configuration commands.

For your modem to Command

Display a view-only password Display a view-and-change password Erase a view-only password Erase a view-and- c h ang e pas s w ord Disable remote access entirely

Example:

Sending

WARNING:

access (using

AT%P1=

If you erase the%P1 password without disabling remote

ATS41=0

will erase the view and change password.

), anyone could access the Busi ness Modem and

AT%P0? AT%P1? AT%P0= AT%P1= ATS41=0

change its configuration.

The guest device requires no configuration to access the host. Follow these steps:

Be sure that the host device has enabled remote access and is set to

auto-answer ( Call the host device (although it doesn’t matter which device originates

ATS0=1

). Know the password, if yo u will ne e d on e .

the call). After a connection is established, do this:

Pause 4 seconds.

Type 4 tildes: ~~~~

Pause 4 seconds.

The administrator of the host device can change the remote-access character using S-Register 42, and the pause duration using S-Register

43. See Appendix A,

S-Registers

for more information.

9-4

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CCESSING AND CONFIGURING THE BUSINESS MODEM REMOTELY

9: A

You should see a display similar to this:

3Com OfficeConnect 56K Business Modem Remote Access Session Serial Number 000000A000000001

Password (Ctrl-C to cancel)?

There is a 3-minute time limit for ent ering the password. If the number of unsuccessful log-in attempts exceeds the set limit, the host device returns online and refuses any further log-in attempts during the remainder of the connection.

When the host accepts the p asswor d, the followi ng messag e and p ro mpt will appear on your screen:

Remote Access granted

Remote->

You may not be prompted for a password. If you aren’t, password security is not active. The following prompt appears on your screen after you type the four tildes:

Viewing and

Changing the Host’s

Configuration

Remote Access granted (query only)

Remote->

During a remote-access session, the maximum number of character s between carriage returns is 40.

Once you've gained guest access to a host, you can communicate with the host just as if you were entering commands from its attached computer.

Accessing the Host

Depending on your access privileges, you can use the regular set of Business Modem AT commands.

If you have this access privilege You can use

View-only Any of the inquiry (ATI) commands View and Configure Any of the Business Modem commands,

except those that cannot be used while online (for example, ATD or ATA). You can also use remote configuration commands.

See the next section for examples.

9-5

Remote

Configuration

Commands

CAUTION:

Be careful not to send

ATZ or ATZ!

or you will lose the

connection!

There are special commands that can be used only during a remote-access session.

You can change the host Business Modem’s serial port rate by using the AT%Bn command.

To change the host Business Modem’s serial port rate to

110 bps 300 bps 600 bps 1200 bps 2400 bps 4800 bps

Example:

Sending

Command

AT%B0 AT%B1 AT%B2 AT%B3 AT%B4 AT%B5

AT%B6

will change the Business Modem’s serial port

To change the host Business Modem’s serial port rate to

9600 bps 19200 bps 38400 bps 57600 bps 115200 bps

Command

AT%B6 AT%B7 AT%B8 AT%B9 AT%B10

rate to 9600 bps.

9-6

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CCESSING AND CONFIGURING THE BUSINESS MODEM REMOTELY

9: A

You can use the AT %Fn command to control the data format .

To change the data format to Command

No Parity (8 data bits) Mark parity (7 data bits) Odd Parity (7 data bits) Even parity (7 data bits)

Y ou can use the A T%Cn command to control whether and when to apply changes to the conf iguration

For your modem to Command

Defer configuration changes to when the call ends.

Restore the origin al configuration. Use this comman d to cancel any changes made

during remote access and restore the original configurat ion.

Force configuration changes. Use this command to make configuration changes

take effect immediately. We do not recommend forcing changes unless it is absolutely necessary because an un reliable connection, or even a loss of connection, may result.

AT%C0

AT%C1

AT%C2

AT%F0 AT%F1 AT%F2 AT%F3

(Default)

Example:

Sending

AT%C1

will cancel any changes made to the modem during a remote access session and restore it to the original configuration.

Even though, by defaul t (%C 0), the cha nges you make do n ot take effect until the next connecti on, the ne w confi gur ati on is r efle ct ed immed iate ly in inquiry responses (ATIn).

Commands that have been written to NVRAM (using &W) and forced configuratio n cha n ge s (%C2) will not be restore d to th ei r pre v io us settings when you send the host AT %C1.

After you make changes to the host’s configuration, the remote- access prompt changes from

Remote->

Remote+>

Quitting a Remote-Access Session

9-7

If you restore the original configuration using the AT%C1 command, the first prompt is restored, assuring you the original configuration is intact.

Quitting a Remote-Access Session

If you want to quit the remote-access login

before

you have entered the

password, return online by pressing <Ctrl>C or typing ATO.

After

you’ve entere d the passwo r d, you can quit by sen ding on e of t hese

commands:

To end the remote-access session Command

And keep the connection. And end the connection. End the connection, and reset the host modem.

ATO ATH ATZ

Before you disconnect, issue the ATI 5 command to the remote modem and check its S41 setting . Make sure S 41 is set for a value o f 1 or great er. If S41 is set to 0, when you disconnect you will not be able to access the remote modem again. To prevent this send ATS41=1&W before you disconnect.

9-8

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CCESSING AND CONFIGURING THE BUSINESS MODEM REMOTELY

9: A

IAL

This chapter contains information about:

■

Setting up Dial Security

■

Maintaining s ecurity accounts

■

What the guest user needs to do

■

Configuring dial security remotely

ECURITY

Overview

Dial Security is designed to protect networks and data centers from unauthorized access.

You should be familiar with these terms before you continue:

Local The device that is directly con nected to the computer

Remote The device at the ot her end of a telephone connection. Host The Business Modem that will be accessed and

Guest The device that will access and control the host

You can configure up to 10 acc oun ts: o ne a dmi nistr ati ve a ccount for you and nine accounts for guest users. The account pr ofiles are stored in the host Business Modem’s nonvolatile random access memory (NVRAM).

There are two forms of Dial Security; each will be explained later in this chapter:

■

Autopass

■

Password Prompting

you are using.

controlled by other devices.

Business Modem.

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10: D

IAL SECURITY

Setting up Dial Security

Here is a summary of the steps for setting up Dial Security:

■

Set up an account for yourself.

■

Identify your account as the Administrative Accou nt.

■

Set up guest-user accounts.

■

Enable local (host) security.

■

Choose a Dial Security method.

■

Enable Dial Security.

■

Activate the Dial Security settings.

Set up an account for yourself.

Use any of the 40 available accounts (numbered 0-39) for your account. Use the AT%An command to set up user accounts. See the figure below

for the five fields to concern yourself with.

The AT%An command is automatically written to NVRAM. It does not require you to send &W.

WARNING:

Do not insert spaces between commas or between fields

and commas. Spaces will invalidate the command.

Setting up Dial Security

10-3

Dialback options

You can set the Business Modem to automatically di alback a certain number after a client modem dials in.

Count your commas! There should always be four commas in the %A command.Do not insert spaces between commas or between fields and commas. Spaces will invalidate the command.

To make the host Business Modem

Hang up and then dial bac k a guest device at a specified number.

Expect a pause o f approximately 1.5 minutes before the modem dials back. You cannot alter t he duratio n of the pause.

Prompt you to enter a number at which to dialback a device, and then have the Business Modem dia lback the device at that number

Disable dialback

Command Example

AT%A0= ,y,n,1

and phone number

AT%A0= ,y,y,

AT%A0= ,n,,

password

area code

password

AT%A0=corn,y,y,n,1,8 475555555

AT%A0=corn,y,y,y,

AT%A0=corn,y,n,,

To enable Dialback, you must enable Dial Security with Prompting. See step 6.

Identify your account as the Administrative Accou nt

For your modem to Command Example

Identify your account as the Administrative Account

AT%L AT%L=PW0

This example sets account 0 as the Administrative Account.

Once you set the administrati ve password , you cannot view o r modify the guest account profiles unless you enter the correct administrative password.

WARNING:

Be sure to remember your administrative password. If you

enable Dial Security and then forget your administ rative password, you

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10: D

IAL SECURITY

will be locked o ut of th e Business Modem’s dial security features. You will need to restore the factory defaults. Thi s will erase ALL passwords and you will have to reconfigure all your accounts.

Set up guest-user accounts.

Use the AT%An command to set up guest-user accounts in th e same way you set up your administrative account. You can set up nine guest accounts. Refer to the figure in step 1 regar ding information about formatting the AT%An command.

After you have enabled the guest accounts, make sure the guest users know their passwo rds and the lo g-in procedure.

Modifying Accounts

After you have set up an account, you can modify each field independently. If a field is to remain unchanged from its original setting, just insert a comma, as shown:

AT%A1=,,,Y,

The command above allows the guest user to supply a dialback number that is different from the one stored in the original account record.

Enable Local Security.

WARNING:

If you do not enable Local Security, the Dial Security settings will not be protected and other users will be able to change or erase them.

For your modem to Command

Protect the administrative password (local security enabled)

ATS53.2=1

You must use the &W command to save the settings in NVRAM. If you don’t, the next time you reset or power off the Business Modem, Dial Security will be disabled.

Decide which Dial Security option to use.

You can choose from the two types of Dial Security: Auto pass an d Password Prompting.

Setting up Dial Security

10-5

Autopass Prompting

Password Prompting

Autopass is the default form of password protection. Autopass automates the process of logging in to the host modem, but it requires the guest and host devices to be Business Modems.

When a guest device attempts an Autopass connection, the gue st includes its passw o rd in its V. 4 2 error-control request. The host modem checks all the enabled passwords in its security accounts for a match.

Password Prom pting allo ws connections wit h

any

guest device, as long as

the guest user knows the correc t password. When the host has Password Promp ting enabled , it asks guest users for a

password. The host modem check s the recei ved password aga inst each of its active Security accounts.

The table below is a comparis on between Autopass and Password prompting.

When using Autopass Prompting When using Password Prompting

Both the host and guest devices are made by 3Com and have Dial Security enabled.

The connection between the Business Modems or modems is under V.42 error control (See Appendix B, Alphabetic Command Summary for information about using

If the guest includes an invalid password, the host sends an INVALID PASSWORD message and hangs up.

If the guest includes a valid password, the host permits a secure connection.

If the guest did not enable Dial Security, the host will not accept the call unless prompting is enabled on the host Business Modem.

AT&M4

AT&M5

)

Guest devices don’t have to support 3Com Dial Security.

V.42 error-control connections aren’t required

If the guest sends an invalid password, the host prompts twice more before disconnecting.

If the guest does not send a password after 60 seconds, the host disconnects.

The host will still always respond to a correct Autopass attempt.

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IAL SECURITY

Enable Dial Security.

WARNING:

Before you enable Dial Security, you must set up an

administrative account and password. See Steps 1 & 2.

For your modem to enable Command

Autopass Dial Security Dial Security with Password Prompting

(this also enables Autopass) Dialback Secur i t y, enab le Password

Prompting and enable Dialback in each guest account

Example:

Issuing

AT%A3=corn,y,y,y,5551234

ATS53.0=1 ATS53.0=1.1=1

AT%An=

number

where n is the account number See the figure in p revious section,

Setting Up Dial Security

information.

password

,y,y,y,

phone

for more

to your modem will enable Password Prompting and Dialback for account 3, which has the password

corn

You must use the &W command to save the settings for Enabling Autopass Dial Security and Dial Security with Password Prompting. If you don’t, the next time you reset or power off the Business Modem, Dial Security will be disabled.

If you need a reference when setting these command, you can use the ATI10 command. See Appendix B, Alphabetic Command Summary for more information about the ATI10 command.

Send

ATZ

ATZ!

to activate the Dial Security settings!

Maintaining Security Accounts

10-7

Maintaining Security Accounts

Once the administrative password is set and Dial Security is enabled, the administrator is the only one who can access account information.

You can use the AT%S = and AT%E= commands to change and modify account information.

For your modem to Command

administrative password

Access accounts by disabling local secu rity View account information, once access has been

granted. Re mote users may only use this command during remote-access sessions if local-access security is disabled .

Erase local-access password Erase Autopass password Erase passwords in accounts 0-9 Erase phone numbers in accounts 0-9 Disable Account, Dialback, and New Number

fields in accounts 0-9. Edit or overwrite an individual account or an

individual accoun t field

Reset &F settings and disbale passwo rd protection

AT%S= ATI10

AT%E=1 AT%E=2 AT%E=3 AT%E=4 AT%E=5

AT%An=

where n is the account number (see the figure in previous section,

Security

Press the RESET button on the back of the modem when offline (same as

Setting Up Dial

for more information)

AT&FS53=0

)

Remote

Configuration

Example:

Sending

AT%E=3

erases passwords for accounts 0- 9.

When using the AT%S= command, the device echoes the administrative password, which is case-sensitive. Business Modems will accept an inv alid password entry, but will lock out users from the security commands.

For example, if the passwor d is Green, but you enter GREEN, an OK is displayed. However, if you try to type a security command (for example, ATI10 to view accounts), an [ACCESS DENIED] message is displayed.

Dial Security accounts may be configured remotely. (See

Security Remotely

at the end of this chapter.)

Configuring Dial

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10: D

IAL SECURITY

What the Guest User Needs to Do

When guest users want to ca ll in to the host (assumi ng you have en abled Dial Security by entering

■

They must know the password.

■

If you have enabled Dialback, they must set their device to

ATS53.0=1

auto-answer.

If the host has security enabled, get a password from the host’s

administrator. The password is case-sensitive, so be sure to copy it correctly.

If the host ha s pro mpting en abled an d the ho st operato r enables Dialback for your account, skip to Step 3.

For guest users with Business Modems:

Create a security account using the password the host’s administrator

asked you to use. (See

Setting Up Dial Security

, earlier in this cha pt er,

for instructions.) You need to assign the password as your Autopass password.

For your modem to Command

Assign the password as your Autopass password

AT%V=PW

the account you set up.

, where n is the number of

Example:

Sending

AT%V=PW3

will assign the password as an Autopass

password for accoun t 3.

Check to see that you set your Autopass password correctly by using

the ATI10 command. Your Autopass password appears beside AUTOPASS PASSWORD, if

you have done al l t he ste p s co rrectl y. Once the Autopass password is set, enable your Business Modem’s

Dial Security.

For your modem to Command

Enable Dial Security

CAUTION:

If you do not follow an S-Register setting with &W, the

ATS53.0=1

setting will be retained only until the next reset or power off.

Configuring Dial Security Remotely

If Dialback is enabled at the host Business Mo dem’s site, set your modem

to answer the host Business Modem when it dials back.

For your modem to be set Command

To answer the Dialback call

Call the host.

After the call ends you can disable Auto Answer.

For your modem to Command

Disable Auto Answer

ATS0=1

ATS0=0

10-9

Configuring Dial Security Remotely

The host administrator can configure the host’s security settings remotely .

At the host device, you must have pr ev ious ly enable d r emote access an d assigned a remote-access password that allows view-and-change privileges (see Chapter 10, Accessing and Config uring the Business Modem Remotely). You may want to use your administr ative password as your remote-access password.

Dialing In From the Remote Site

From the remote site, connect to the host using Dial Security. Once a

connection is made, follow the instructions for beginning a remote-access session as described in Chapter 10,

Configuring the Business Modem Remotely

When remote access has been granted, use the AT%S= command to

access the Dial Security accounts. See

Maintaining Security Accounts

Accessing and

section earlier in this chapter.

ATI10

To view the security account information use Make any configuration changes and execute them immediately by

AT%C2

entering To end the remote session and reactivate Dial Security on the host, reset

the host device by issuing

ATZ

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10: D

IAL SECURITY

WARNING:

If you do not use the ATZ command to end a remote-access session, Dial Security will rema in disabled at the host, and anyone dialing in to the host for remote access will have access to the ATI10 screen and all Dial Security accounts.

LOW

This chapter contains information about

■

Hardware and software flow control

■

Received-data flow control

■

Transmit-data flow control

ONTROL

Overview

The Business Modem has t wo buff ers, one for data tra nsmitted fr om your computer, and one for data received from t he phone line.

Flow control provides a system for stopping and starting transmission depending on how full the bu ffers are. Flow Control’s purpose is to prevent overfilling the buffers, which may cause data to be lost.

We recommend that you use hardware flow control. If you do, depending on your communications software, you will also need to enable hardware flow control in your communications software.

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LOW CONTROL

11: F

Hardware and Software Flow Control

Hardware Flow

Control

Software Flow

Control

There are tw o kinds of flow control: hardware and software. Bu siness Modems support both, bu t your compu ter and communi cations softwar e must also support the kind of flow control you choose.

Business Modems implement hardware flow control by detecting that a buffer is 90% full and then interrupting the Clear to Send (CTS) signal to stop the flow of data. When the buffer drops back to 50% full, the Business Modem sends CTS to restart the flow of data.

Business Modems implement software flow control by detecting that a buffer is 90% f ull and then sending special characters in the data stream to stop the flow of data. When the buffer drops back to 50% full, the Business Modem sends special characters in the data str eam to restart th e flow of data.

The problem with software flow control is that the characters used to stop (<Ctrl>Q) and start (<Ctrl>S) the flow of data can occur naturally in the data flow. Enabling software flow control instructs the Business Modem to recogniz e and act on these characters, e v en if they are not intended to control the data flow.

Using software flow control may prove satisfactory if you're transferring text files only.

The start command is called XON (for transmit on) and the stop command is called XOFF (transmit off). You can change the characters used. See Registers S22 and S23 in Appendix B, A lphabetic Command Summary.

Received Data Flow Control

11-3

Received Data Flow Control

Flow control settings are cont rolled by the AT& Rn and AT&In commands. The default settings are &R2&I0. Use the following table for more information ab o ut set t in g th e flo w co ntrol.

For your modem to Command

Pause before sending CTS signal after receiving the Request to Send (RTS).

Ignore the RTS signal. &R1 is required if your computer or software does not

support RTS Enable hardware flow control. The Business Modem sends da ta to your computer only

upon receipt of the RTS signal. Disable software (XON/XOFF) flow control. Recommended for non-ARQ (N ormal mode) calls (see

AT&I5). While the Business Modem characters it recognizes are +++, the escape code.

Enable software (XON/XOFF) flow control. Use in ARQ mode only.

Keep in mind that the XON/XOFF characters sent to the remote computer may interfere with XON/XOFF signaling between the remote computer and remote device (see AT&I2).

Force the Business Modem to act on your XON/XOFF commands, but remove them from the data stream instead of passing them to the remote computer.

This ensures that the remote computer does not confuse your XON/XOFF characters with those from its attached device. This is the recommended setting for ARQ mode.

When using the AT&I2 command, if the call is not in ARQ mode, there is no flow control on the link. If you send an XOFF to your modem and it stops passing data, it has no way to tell the remote computer and modem to stop sending for a while, and the local’s buffer may overflow. For more reliable control in non ARQ mode, see AT&I5.

Enable Hewlett Packard-Host mode. Applies only to devices attached to an HP mainframe that uses the ENQ/ACK protocol. Use in ARQ mode only.

If you want to use software flow control to transfer non-text (binary) files, set serial port and connection rates equal using &B0 and & N0. See Chapter 9,

Data Rates

for more information about these commands.

is online, the only

Controlling

AT&R0

AT&R1

AT&R2

AT&I0

AT&I1

AT&I2

AT&I3

(Default)

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LOW CONTROL

11: F

For your modem to Command

Enable Hewlett Packard-Terminal mode. Applies only to Business Modems attached to terminals in an HP system that uses the ENQ/ACK protocol. Use in ARQ mode only.

Enable flow control when the connection is not under error control. For this to work, the remote device must also have AT&I5 capability. In ARQ mode, a Business Modem set to AT&I5 operates the same as it does when set to &I2. It acts on your XON/XOF F command s, but d oes not pass them to the remote system. The error-control protocol enables the devices to control the flow of data on the phone link.

In non-ARQ mode, a Business Modem set to AT&I5 operates as though flow control were disabled (AT&I0); it does not look for your typed XON/XOFF commands. However, it does look for XON/XOFF characters coming in over the phone link. When the remote device sends XON/XOFF commands, the Business Modem either resumes or stops transmitting data over the link and drops the characters from the data stream.

If both devices are set to AT&I5, operators at each end can signal the remote device to stop sending . Thus, controlling the data flow on the phone link and preventing their own device’s buffer from overflowing. At the computer/device interfaces, the devices independently control the flow of data through their Transmit Data (AT&H) settings.

AT&I4

AT&I5

Example:

Sending

AT&I2

will remove XON/XOFF commands from the data stream instead of sending them to the remote computer. This will force the Business Modem to act of the XON/XOFF commands.

Transmit-Data Flow Control

11-5

Transmit-Data Flow Control

This type of flow control is for data transmitted to the Business Modem by its attached computer.

For your modem to Command

Disable transmit data flow control Enable Hardware flow control. Requires that your computer and software support

Clear to Send (CTS) at the EIA-232 in terface. Enable Software flow control. Requires that your software support XON/XOFF

signaling. Use both hardware and software flow control. If you are unsure about what your equipment supports,

select this option.

AT&H0 AT&H1

AT&H2

AT&H3

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11: F

ANDSHAKING

, E

RROR

ONTROL

Handshaking

ATA

HROUGHPUT

This chapter contains information about:

■

Handshaking

■

Selective Reject

■

V.90 Capabilities

■

Error Control

■

Data compression

■

Getting maximum throughput

With each call, Business Modems go through a link negotiation process with the remote dev ice. Another name for the negotiation process is "handshaking."

Business Modems default to V.90 modulation and try for the highest possible speed when they attempt to connect with another mod em: 56 Kbps. If the remote device is not V.34-capable, a connection is made using the highest compatible modulat ion scheme (x2, V.34, V.FC, V.32 terbo, V.32 bis, and so on, down to as low as Bell 103, or 300 bps) .

OMPRESSION, AND

Selective Reject

The Business Modem supports Selecti v e Reject for analog calls. Selective Reject improves performance on noisy lines by reducing the amount of overhead incurred when the protocol must resend data due to er rors.

When Selective Reject is act ive, on ly the frame th at cont ain ed the er ror is resent, instead of the frame plus all of the following unacknowledged frames.

12-2

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12: H

ANDSHAKING

Selective Rejec t is an opt io na l pa rt of th e IT U-T V.42 (LAPM) standa rd.

Attaining Speeds Above 28.8 Kbps

V.34 connections at 21.6, 24, and 26.4 Kbps are common. To get connections of 28.8, 31.2, and 33.6 Kbps, line quality must be pristine end-to-end. In ad dition, 31.2 and 33.6 Kbps connection rates are possible only when the device to which you are connecting also runs software that supports speeds above 28.8 Kbps.

Attaining 56 K Connections

When a client x2 modem connects to a server x2 modem, the path through the telephone network between the modems is subject to the following conditions for an x2 connection to be made.

RROR CONTROL

, E

For your modem to Command

Enable Selective Reject Disable Selective Reject

ATA COMPRESSION, AND THROUGHPUT

, D

ATS51.6=0 ATS51.6=1

(Default)

A digital co nnection at one end.

ISPs or other online services must have a digital connection to the public swit ched telephone network (PSTN). Most major online services have a digital connection to the PSTN.

Only one digital-to-analog conversion.

There can be only one digital-to-analog conversi on in the tele ph o ne ne twor k betwe e n the x2 server modem and the x2 client modem.

Controlling the V.8 Call Indicate Tone

The V.8 protocol sp eeds cal l negoti ation a nd specif ies a cal l indicat e tone. Providing the call indicate tone is optional. For compatibility, we ship the Business Modem with the call indicate tone disabled.

For your modem to Command

Enable the call indicate tone

ATS54.6=0

V.90 Capabilities

12-3

If you enable the V.8 call indicate tone, expect to hear a sound like a fast ringing signal whil e the call is being connected.

V.90 Capabilities

Other Protocols

V.34

If the remote device has V.34 capability, Business Modem use a line probing tech nique to dete rmine the h ighest spe ed possib le und er curr ent line conditions, then they complete th e connection. If the remote device does not have V.34 capability, the Business Modem listens to the device's answer tones to identify the standard rate at which the remote device is operating, and then ad justs to that rate.

When the Business Modem answers a c all, i t sen ds out a series of answe r tone signals until both devices negotiate the best connection rate.

The Business Modem has V .90 capabilities. The Business Modem can dial into V.90 servers to establ ish speeds up to 56K downstream.

For your modem to Command

Enable V.90 Disable V.90

ATS58.5=0 ATS58.5=1

(Default)

x2 client modems can receive data at speeds up to 56 kbps and send data at V.34 speeds. To use x2, the client x2 modem must connect to a server x2 modem. If clients attempt to connect to ISPs that do not use x2, the client modem will negot iate the next available modulation. For example, an x2 client modem call ing into an ISP that only supports V.34, the modem will only negotia te the highest v.34 connection rate. The maximum V.34 connection speed is 33.6 kbps.

Fast Class (V.FC)

Handshaking

After trying V.34, the Business Modem tries for the fastest possible V.Fast Class (28.8 Kbps) connection. In order to negotiate V.FC, V.8 has to be disabled. V.FC is not part of the ITUV.8 training sequence.

If the remote device is not V.FC capable, a connection is made using the highest compatible modulation scheme (V.32

terbo

, V.32

bis

, and so on,

down to as low as Bell 103, or 300 bps).

12-4

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12: H

ANDSHAKING

If the remote devi ce has V.FC capability, the Business Modem uses a line probing tech nique to dete rmine the h ighest spe ed possib le und er curr ent line conditions , the n co m p le te s the con n ec ti on . If the remote an a lo g device does not have V.FC capability, the Business Modem listens to the device's answer tones to identify what standard rate the remote anal og device is operating at, and adjusts to that rate.

When a Business Modem answers a call, it sends out a series of answer tone signals until both devices negotiate the best connection rate.

RROR CONTROL

, E

ATA COMPRESSION, AND THROUGHPUT

, D

HST

USR V.32terbo to USR

V.32terbo

We recommend that Business Modems retain the default B0 and &N0 settings. This allows them to make an alog connections wi th "V." protoc ol and HST modems in both Originate and Answer modes at a variety of speeds.

When originating an analog call, the Business Modem set to B1 sends out a Bell answer tone, which is the prevalent st andard in the U.S. and Canada for connection s at 2400 bps and lower. At higher speeds, the Business Modem also recognizes the ITU answer tones necessary for connecting with V. protocol modems, and adjusts to the answering device.

However, when answering a call, a Business Modem sending out the Bell answer tone (B1) won't be r ecognized by V. protocol modems. The calling modem, instead, will wai t until it detects a to ne it re cognizes. The V.22bis tone used at 2400 bps.

If you want to have your Busin ess Modem connect with V. protocol modems at high speeds, make sure it is set to B0 for the ITU answer tones. It will also connect with HST modems at speeds up to 16.8 Kbp s.

On these analog connections, Business Modems have two features that result in outstanding performance: Quick Connect and Adaptive Speed Leveling (ASL).

■

Quick Connect allows two Business Modems to connect in approximately 7 seconds, a far shorter time than with most devices.

■

ASL (described below in Other V.Protocol Operations) is used by Business Modems operating in V.32terbo and V.32bis modes.

3COM 56K User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual