3Com DIGITAL MODEM manual Led

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2-2 CHAPTER 2: INSTALLING AND CONFIGURING THE DIGITAL MODEM

Table 2-1 Front Panel LED Indicator Definitions

LED

Color

Description

 

 

 

Power

Yellow

Power Indicator. Lit when power is on and remains lit as long

 

 

as power is available from the ac wall transformer plugged into

 

 

the electrical outlet.

Test

Yellow

Self-Test/Status. Flashes when the digital modem is

 

 

executing its power-up self-test or a user-initiated reset. If the

 

 

results of the self-test or reset are normal, the LED goes off. If

 

 

the result of the self-test is abnormal and a fault is detected,

 

 

the LED remains lit but does not flash.

D-Channel

Yellow

D Channel/Status. Provides a quick indication of the ISDN

 

 

physical network interface and D channel status. If the physical

 

 

ISDN interface is not synchronized or is disconnected, this LED

 

 

remains lit.

 

 

If the physical interface establishes synchronization and the

 

 

ISDN D channel signaling procedures are not properly

 

 

established, the LED flashes.

 

 

Once the physical and D channel signaling are synchronized,

 

 

the LED goes off.

 

 

If any physical loss of framing occurs, the LED lights; if there is

 

 

a loss of D channel signaling, the LED flashes.

B-1

Yellow

B-1 Channel Indicator. Indicates the activity state of the B-1

 

or

channel of the ISDN interface. Green indicates a

 

green

circuit-switched data call. Yellow indicates a circuit-switched

 

 

voice call. If a call is in a dialing state, the LED flashes. When a

 

 

call enters the active state, the appropriate LED color stays lit.

 

 

When the call is disconnected, the LED goes off.

B-2

Yellow

B-2 Channel Indicator. Indicates the activity state of the B-2

 

or

channel of the ISDN interface. Green indicates a

 

green

circuit-switched data call. Yellow indicates a circuit-switched

 

 

voice call. If a call is in a dialing state, the LED flashes. When a

 

 

call enters the active state, the appropriate LED color stays lit.

 

 

When the call is disconnected, the LED goes off.

 

 

 

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Contents Member of the 3Com Impact product family Isdn External Digital Modem User Guide3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Support from 3Com C-4 Returning Products for Repair C-4 QuickSelectFigures Tables About this Guide How to Use This GuideIntroduction Conventions Introduction Introduction 3Com Impact digital modem provides the following 3Com Impact Digital Modem FeaturesVoice Capabilities Data CapabilitiesSimultaneous Data and Voice Capabilities 3Com Impact Digital Modem Package Contents 3ComA * J6 Isdn Digital Line Configuration RequirementsISDN-1 Computer System RequirementsAT&T 5ESS EwsdApple Macintosh Requirements IBM PC or Compatible RequirementsDTR Signal Ground GNDClear to Send CTS From digital modem Ring Indicator RI Cabling RequirementsBack Panel Power Switch and Connectors Installing Configuring Digital ModemLED Installing the Digital Modem in an IBM-compatible PC Installing the 3Com Impact Digital ModemInstalling the Digital Modem in an Apple Macintosh Computer Installing the 3Com Impact Digital Modem Configuring the 3Com Impact Digital Modem Select Run from the File menu. In the Run dialog box, type Configuration for IBM PC or Compatible ComputerCOM port to which the digital modem is connected 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 Placing Isdn Data Calls Placing and Receiving CallsMultilink PPP Calls With Dynamic Bandwidth Allocation Installing and Configuring the Digital Modem Placing Analog Modem Calls Using the Phone Out PortUsing Communications Software to Place Calls Incoming circuit-switched data calls from otherReceiving Calls Using the Phone Out Port Placing Calls Using the Phone Out PortQuickSelect T1 access linesProtocol Support Async-Sync PPP ConversionTroubleshooting Tips TroubleshootingTroubleshooting Monitor the B-1 and B-2 LEDs Troubleshooting Click the Firmware button Firmware dialog box appears If problems persist, refer to Appendix C,Technical SupportDownloading Firmware to Your External Digital Modem Click the Tools button Firmware and Tests buttons appearClick OK Overview AT Command SETAT gets the attention of your 3Com Impact digital modem Type AT Command Set for the 3Com Impact Digital Modem AT Commands REGISTERS, and Result CodesTable B-1 summarizes the AT command set SN= SN?Initial configuration set Settings AT \SCommands \T0 disables inactivity timer defaultATC1 AT Command Set for Internal Analog Fax ModemFlow control Enable MNP mode Stream default Block Results of commandsReceived line signal level Non-error corrected mode onlyAnswer mode detection phase Mode to be negotiated in a DirectMNP extended services Enable inhibits MNP extendedRemote S Registers Isdn PPP Magic-Number Block Service providerS83 Table B-4 lists the 3Com Impact digital modem result codes Digital Modem Result Codes3Com Bulletin Board Service On-line Technical ServicesTo use Ask3Com Log on to CompuServe 3ComFacts Automated Fax ServiceWorld Wide Web Site Ask3Com on CompuServeNorway 800 Sweden 020 0800 Support from Your Network SupplierCountry Fax Number Hong Kong 852 537 Country Fax Number Italy 1678Country Telephone Number Fax Number Support from 3ComReturning Products for Repair To obtain an RMA number, call or faxLimited 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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