3 Com U.S. Robotics 3Com User Manual

56K Modem
User’s Guide & Reference
This manual covers installation and operating instructions for:
3Com U.S. Robotics Modems
3Com, the 3Com logo, and U.S. Robotics, are registered trademarks of 3Com
Corporation or its subsidiaries. Windows is a registered trademark of Microsoft Corp. Any
other trademarks, trade names or service marks used in this manual are the property of
their respective owners.
Copyright © 2000 3Com Corporation or its subsidiaries
3800 West Golf Road
Rolling Meadows, IL 60008
All Rights Reserved
*IMPORTANT! In accordance with the ITU standard for 56K transmissions (V.90), this modem is capable of
56 Kbps downloads. However, due to FCC rules which restrict power output of the service providers’
modems, current download speeds are limited to 53 Kbps. Actual speeds may vary depending on line
conditions and other factors. Uploads from users to server equipment travel at speeds up to 31.2 Kbps. An
analog phone line compatible with the V.90 standard and an Internet provider or corporate host site
compatible with the V.90 standard are necessary for these high-speed downloads.
See http://www.3com.com/56k for details.

3 Com U.S. Robotics 3Com Specifications

General

Device Type	Modem
Connection Type	Dial-Up
Maximum Data Transfer Rate	56 Kbps
Fax Speed	14.4 Kbps
Brand	3Com
Interface	USB, Serial
Compliance Standards	V.90
Operating Systems Supported	Windows, Mac OS

Summary

Modem Product Features

Modem Installation Guide

Physical Installation Steps

Detailed instructions for installing the modem card into the computer and connecting phone lines.

Connecting Peripherals and Power

Windows 98 SE Driver Management

Windows ME Driver Management

Windows NT 4.0 Driver Management

Windows 2000 Driver Management

Driver Installation

Guide for installing modem drivers on Windows 2000 using the Found New Hardware Wizard.

Driver Uninstallation

Technical Reference: AT Commands

Typing Commands

Instructions on how to enter commands in terminal mode, including AT prefix and character limits.

AT Command Set Overview

Lists and describes various AT commands for modem control, including inquiry and dial commands.

Technical Reference: Extended and Fax Commands

Extended AT Command Set

Details on advanced AT commands, including &An, &Bn, &Cn, &Dn, &Fn, &Gn, &Hn, &In, &Kn, &Mn, &Nn, &Pn, &Rn, &Sn, &Tn, &Un, &Wn, &Yn, &Zn, &ZL, &$.

Facsimile Commands

Technical Reference: Speakerphone and Other Commands

Speakerphone/TAD Commands

Lists and describes AT commands specific to speakerphone and TAD (Telephony Answer Device) functions.

Technical Reference: S Registers (Part 1)

S Register Definitions (Part 1)

Defines S registers S0 through S33, covering ring count, escape codes, modem waits, carrier recognition, and various bit-mapped settings.

Technical Reference: S Registers (Part 2)

S Register Definitions (Part 2)

Defines S registers S34 through S41, covering trellis encoding, shaping, ring detection, and default time settings.