3Com DIGITAL MODEM manual Type

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A-2 APPENDIX A: AT COMMAND SET OVERVIEW

Follow these steps to use AT commands:

1Launch your communications software.

Be sure your communications software is in terminal mode.

2Be sure the digital modem is in command mode (sometimes called local mode or terminal mode) so that it interprets your commands.

When your computer is powered on, the digital modem automatically starts in command mode. If you have recently used the digital modem to make a call and have not yet disconnected, type +++ to switch to command mode.

3Type:

AT <commands> [Enter]

An AT command line starts with the characters AT. The command line can accept up to 40 command characters in the line (not including the two AT characters, spaces, or [Enter]).

After completing its tasks, the 3Com Impact digital modem sends a message to the screen.

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Contents Isdn External Digital Modem User Guide Member of the 3Com Impact product family3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents QuickSelect Support from 3Com C-4 Returning Products for Repair C-4Figures Tables Introduction How to Use This GuideAbout this Guide Conventions Introduction Introduction 3Com Impact Digital Modem Features 3Com Impact digital modem provides the followingSimultaneous Data and Voice Capabilities Data CapabilitiesVoice Capabilities 3Com Impact Digital Modem Package Contents Isdn Digital Line Configuration Requirements 3ComA * J6Computer System Requirements AT&T 5ESSEwsd ISDN-1IBM PC or Compatible Requirements Apple Macintosh RequirementsSignal Ground GND Clear to Send CTS From digital modem Ring Indicator RICabling Requirements DTRInstalling Configuring Digital Modem Back Panel Power Switch and ConnectorsLED Installing the 3Com Impact Digital Modem Installing the Digital Modem in an IBM-compatible PCInstalling the Digital Modem in an Apple Macintosh Computer Installing the 3Com Impact Digital Modem Configuring the 3Com Impact Digital Modem COM port to which the digital modem is connected Configuration for IBM PC or Compatible ComputerSelect Run from the File menu. In the Run dialog box, type Installing and Configuring the Digital Modem Registers Installing and Configuring the Digital Modem Install Installing and Configuring the Digital Modem Configuration for Apple Macintosh Computer Installing and Configuring the Digital Modem Multilink PPP Calls With Dynamic Bandwidth Allocation Placing and Receiving CallsPlacing Isdn Data Calls Installing and Configuring the Digital Modem Using the Phone Out Port Using Communications Software to Place CallsIncoming circuit-switched data calls from other Placing Analog Modem CallsPlacing Calls Using the Phone Out Port Receiving Calls Using the Phone Out PortT1 access lines Protocol SupportAsync-Sync PPP Conversion QuickSelectTroubleshooting Troubleshooting TipsTroubleshooting Monitor the B-1 and B-2 LEDs Troubleshooting If problems persist, refer to Appendix C,Technical Support Downloading Firmware to Your External Digital ModemClick the Tools button Firmware and Tests buttons appear Click the Firmware button Firmware dialog box appearsClick OK AT gets the attention of your 3Com Impact digital modem AT Command SETOverview Type Table B-1 summarizes the AT command set AT Commands REGISTERS, and Result CodesAT Command Set for the 3Com Impact Digital Modem SN? SN=Settings AT \S Commands\T0 disables inactivity timer default Initial configuration setAT Command Set for Internal Analog Fax Modem ATC1Results of commands Received line signal levelNon-error corrected mode only Flow control Enable MNP mode Stream default BlockMode to be negotiated in a Direct MNP extended servicesEnable inhibits MNP extended Answer mode detection phaseRemote S Registers Isdn S83 Service providerPPP Magic-Number Block Digital Modem Result Codes Table B-4 lists the 3Com Impact digital modem result codesOn-line Technical Services 3Com Bulletin Board Service3ComFacts Automated Fax Service World Wide Web SiteAsk3Com on CompuServe To use Ask3Com Log on to CompuServeSupport from Your Network Supplier Country Fax Number Hong Kong 852 537Country Fax Number Italy 1678 Norway 800 Sweden 020 0800Support from 3Com Returning Products for RepairTo obtain an RMA number, call or fax Country Telephone Number Fax NumberLimited Warranty 3Com Corporation Bayfront Plaza Interference Handbook Canadian Notice

DIGITAL MODEM specifications

The 3Com Digital Modem represents a significant advancement in communication technology, designed to enhance data transmission over telephone lines. This modem is a part of a lineage of 3Com products that focus on delivering robust networking solutions, tailored for both personal and professional use.

One of the main features of the 3Com Digital Modem is its high-speed data transfer capabilities. With speeds reaching up to 56 Kbps, it allows users to send and receive large amounts of data quickly, which is essential for applications that require efficient data exchange. This speed ensures smoother internet browsing, quicker downloads, and more reliable connections for applications such as video conferencing and online gaming.

The modem is equipped with advanced error correction technologies, including V.42 and V.42bis protocols. These protocols help to maintain data integrity by detecting and correcting errors during transmission. This results in a more reliable connection, reducing the likelihood of dropped calls or corrupted data transfers, which can be particularly frustrating for users engaged in critical business communications.

Another notable characteristic of the 3Com Digital Modem is its compatibility with various operating systems, making it versatile for different users. It supports Windows, Mac, and various other platforms, ensuring that it can be integrated seamlessly into existing systems without the need for extensive configuration. This plug-and-play capability simplifies installation for users, allowing them to get connected quickly and efficiently.

The modem also incorporates an innovative design that facilitates improved heat dissipation, ensuring optimal performance during prolonged use. Its compact form factor makes it suitable for both home and office environments, allowing for easy setup without consuming excessive desk space.

In addition to these features, the 3Com Digital Modem boasts strong security protocols, ensuring that users' data is protected against unauthorized access while being transmitted. This is particularly important in today’s digital landscape, where data breaches and cyber threats are prevalent.

Overall, the 3Com Digital Modem combines speed, reliability, and security, making it a valuable asset for anyone looking to enhance their connectivity experience. Its robust feature set and user-friendly design cater to a broad audience, from casual users to business professionals, reflecting the evolution of modem technology in a digital-first world.
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