3Com 3C882 manual Troubleshooting, Checking the Basics

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7 TROUBLESHOOTING

This chapter explains how to isolate and solve problems encountered with the 3C882 ISDN modem. Problems may stem from incorrect option settings or improper installation.

This chapter covers the following main topics:

■Checking the basics

■Monitoring the LEDs

■Evaluating symptoms and solutions

■Using on-line help

■Finding more information

■Contacting technical support

■Downloading Firmware

There are no user-serviceable parts inside your 3C882 ISDN modem. Unauthorized opening of the unit will void the warranty.

Checking the Basics

Before you monitor the LEDs or refer to the section on symptoms and solutions, check the following:

■Verify that the cables are not physically damaged. If damage is apparent, replace the cable.

■Verify that the power cord is connected to the 3C882 ISDN modem and an electrical outlet.

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Contents

3COMIMPACT IQ External Isdn Modem User Guide 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Year Limited Warranty Contents Conﬁguring Multilink PPP Placing Isdn Data CallsAT&T 5ESS Custom Switch A-4 RegistersWorld Wide Web Site Support from 3Com E-4 Returning Products for Repair E-4Figures Main 3C882 Conﬁguration Steps for a Macintosh Tables Pin DescriptionsHow to Use This Guide Advanced configuration ChapterAbout this Guide IntroductionConventions Network Access with the 3C882 Isdn Modem Introduction3C882 Isdn Modem Features Easy Installation and Use3C882 Isdn modem provides the following features High Performance ProtocolsIsdn Standards and Interface Ansi V.120 rate adaptionVoice Features DiagnosticsWarranty Security3C882 Isdn Modem Package Contents Before You Install the 3C882 Isdn ModemIBM PC or Compatible Requirements Apple Macintosh RequirementsIsdn Switch Type Isdn InformationIsdn Information Sheet 3ComImpact IQ Isdn ModemBefore You Install the 3C882 Isdn Modem Installing the 3C882 Main hardware installation steps are depictedFront Panel LED Indicators Familiarizing Yourself with the 3C882 Isdn ModemFront Panel LED Indicator Deﬁnitions As power is supplied to the unitColor Description GreenInstalling a Serial Cable You will need the following type of serial cableInstalling the Isdn Cable Installing Analog Equipment Analog Equipment ConnectionInstalling Analog Equipment Installing the Power Cable Power Cable ConnectionConfiguration for AN IBM-COMPATIBLE PCConﬁguring the 3C882 Isdn Modem for a PC Main steps are shown in FigureInstalling the 3C882 Software To install the 3C882 Isdn modem softwareClick OK Running Spid Wizard Double-click the 3ComImpact IQ 3.0 icon shown in FigureYou will see a start message, as shown in Figure First Telephone Number Dialog Box for PC Second Telephone Number Dialog Box for PC Click Finish Conﬁguration dialog box buttons do the followingConfiguring the 3C882 Isdn Modem for a PC Conﬁguring Multilink PPP Appears Click FinishConﬁguring the B Channel Rate Conﬁguring Voice Call RoutingConfiguring the 3C882 Isdn Modem for a PC Verifying the Conﬁguration 11 Conﬁguration for One Telephone Number & Two DevicesConfiguring the 3C882 Isdn Modem for a PC Setup Using Windows 12 New Hardware Dialog Box13 Install From Disk Dialog Box 15 Install New Modems Dialog Box 16 Modem Manufacturers and Models Dialog Box Setup Using Windows NT RAS 17 Network Settings Dialog Box 18 Remote Access Setup Dialog BoxRemote Access Setup dialog box appears Conﬁgure Port dialog box appearsConfiguration for AN Apple Macintosh Computer Conﬁguring the 3C882 Isdn Modem for a Macintosh ComputerMessage box appears Click Continue. -3 appearsClick OK This completes the software installation procedure Click Continue. -4 appears3ComImpact IQ Program Icon Select Modem Port ScreenSpid Wizard Start Screen 10 First Telephone Number Screen for Macintosh 11 Second Telephone Screen for Macintosh 12 Successful Conﬁguration Screen Quit. Click Quit to leave the Conﬁguration dialog box Configuring the 3C882 Isdn Modem for a Macintosh Computer 15 Conﬁguration for One Telephone Number per Device Verifying the Conﬁguration Configuring the 3C882 Isdn Modem for a Macintosh Computer Advanced Configuration Advanced Conﬁguration Parameter Default ValuesDBA Auto Answer Baud RateChanging The Parameter Settings Send the command AT $B 230400 to the 3C882 Isdn modemAuto Answer Disabled Autobaud EnabledType AnswerPlacing and Receiving CallsPlacing Isdn Data Calls Placing Calls Automatically Placing Calls Manually Placing Multilink PPP Calls Placing a 56K TollSaver Call An example is as follows ATD 1 908 555 1212 & 1 908 555When the 3C882 Isdn modem receives a voice call, Receiving Isdn Data CallsAn example is as follows Atdd 1 908 555 Channels ﬂash and then remain litPlacing Voice Calls Using an Analog Phone Port Receiving Voice Calls Using an Analog Phone PortTroubleshooting Checking the BasicsMonitoring LEDs Monitoring the Test LEDMonitoring the D Channel LED Evaluating Symptoms and Solutions Monitoring the B Channel LEDsSymptom Possible Cause Solution LED remains lit Properly configured You receive aCannot be sent Upon power up Previous firmware Do not remain Or application software orUsing On-Line Help Finding More Information Contacting Technical SupportDownloading Firmware to Your 3C882 Isdn Modem Following on-line help is availableOrdering Isdn Service Placing the Isdn Order Through 3ComPlacing the Isdn Order Through Your Telephone Company Give the representative the 3C882 Isdn modem Isdn codeTable A-1 Isdn Order Codes Number of Telephone Numbers Package K Package USwitch Circuit-switched DataTelephone company with the information provided Table A-2Switch To order Isdn service for the Northern Telecom DMS Switch, supply the telephone company with the informationProvided in Table A-4 DynamicEwsd Key System Ekts Flexible Call Offering FCO Yes †AT Commands REGISTERS, and Result Codes AT Command SetHost computer default Answer mode only\Q0 disables flow control Hardware flow control defaultSettings AT \S Reset AT Z+++ Enter command state \T0 disables inactivity timer defaultRegisters Registers except S0 are the 3Com extended registersIsdn Default S65 Isdn Caller ID for Voice Calls for Phone Port S75 Connection Delay Result Codes Table B-3 lists the 3C882 Isdn modem result codesSpecifications 3C882 Isdn Modem SpeciﬁcationsRS-232 COM Port Pin Speciﬁcations Clear to Send CTS From Isdn modemPC Serial Cable Pin Speciﬁcations Macintosh Serial Cable Pin SpeciﬁcationsReceive Data RD Send Data SD Configuration Using Conﬁguration Using DOSTo copy the README.TXT ﬁle, at the C\3Com prompt, type Use the Space Bar to select the 3C882 Isdn modem’s COM port Configuration Using DOS On-line Technical Services 3Com Bulletin Board ServiceTechnical Support World Wide Web Site Call the telephone number nearest you3ComFacts Automated Fax Service 3ComForum on CompuServeTo use 3ComForum Log on to CompuServe Press Return to see the 3ComForum main menuU.S. and Canada, call 800 876 3266 for customer service Support from Your Network SupplierSupport from 3Com Returning Products for RepairGlossary Async-Sync PPP ConversionChannel COM port Isdn LayerPlain old telephone service 120Analog equipment installation 2-6 analog port IndexNumerics Apple macintosh requirements 1-6 Async-Sync PPPData Using AT commands 6-2 voice Registers B-4 Serial cable installationDMS 100 A-5 Result codes B-8Index Limited Warranty Santa Clara, CA 95052-8145 408 3COM END User Software License Agreement For civilian agencies Interference Handbook Canadian Notice  1996, 3Com Corporation