Troubleshooting Maintenance, Monitoring LEDs | 3Com Dual 56K

TROUBLESHOOTING AND

10 MAINTENANCE

This chapter explains how to isolate and solve problems encountered with the Dual 56K LAN Modem, such as problems caused by incorrect settings or improper installation. Basic maintenance information for the Dual 56K LAN Modem is also provided.

The following main topics are covered in this chapter:

■Checking the basics

■Monitoring the LEDs

■Evaluating symptoms and solutions

■Finding more information

■Contacting technical support

■Downloading ﬁrmware

■Resetting the LAN Modem

■Reviewing statistics

■Synchronizing the LAN Modem clock

CAUTION: There are no user-serviceable parts inside your Dual 56K LAN Modem.

Unauthorized opening of the unit will void the warranty.

Checking the Basics Before you monitor the LEDs or refer to the symptoms and solutions section, 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 LAN Modem and an electrical outlet.

■Verify that the analog telephone cables are properly connected to the LAN Modem and their telephone wall outlets.

Monitoring LEDs	If you are experiencing operational inconsistencies, you can monitor the Alert and
	LAN Status LEDs to isolate problems.

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3Com Dual 56K manual Troubleshooting Maintenance, Monitoring LEDs, Unauthorized opening of the unit will void the warranty

Contents

Dual 56K LAN Modem Bayfront Plaza 3Com CorporationSanta Clara, California 95052-8145 Wichtige Sicherheits-Informatio nen Important Safety InformationImportant Safety Information Medidas de Seguridad Importantes Important Notice de Securite Informazioni Importanti per la Sicurezza Additional Safety Information If the unit shows signs of a distinct change in performance Table of Contents Installing the Dual 56K LAN Modem Networking Primer Page About this Guide Shows you where to ﬁnd speciﬁc information in this guide List conventions that are used throughout this guide ConventionsIcon Alerts you to Convention Description Introduction Introduction Local Networking with Applications Internet and a Private Network Local Networking and Dial-out Access with Dial-in Support Color Description Description Front Panel LED Indicator Deﬁnitions Features Bandwidth Management Error Control and Data CompressionRemote Management Protocols Diagnostics UpgradeabilityWarranty Modulation Schemes UAL 56K LAN M Odem Wan Side The Two Using the Modem56K Modems Channels Using the Modem Channels 192 Simultaneous Dial-in and Dial-out Connections Possible, as shown in Figure Locations two different locations, as shown in Figure Multilink PPP UnderstandingOther Line Usage Options 56K LAN Modem’s Manual Call Control Through an RS-232 serial COM port VPNs Support for VirtualPrivate Networks Dual 56K LAN Modem Functionality Description Before You Begin Package ContentsBefore YOU Begin Before YOU Begin TCP/IP Dialog Box for Macintosh Computers Select Protocol and then click Add Click Add Select Network Component Type dialog box appears Select Network Protocol dialog box appears You may need your Windows NT 4.0 installation CD-ROM Select TCP/IP Protocol, and then click OK Select the Protocols tab, as shown in Figure Dhcp Message Box Following message appears Double click Local Area Connection Click InstallClick Properties Select Internet Protocol TCP/IP and then click Add Static IP Address Setting Up YourComputer If You Have For Windows 95 and 98 Users Set Up Steps for Statically Conﬁgured Workstation For Windows 2000 Users From the Start menu, select Settings and then Control PanelClick OK From the Apple menu, select Control Panels, and then TCP/IP For Windows NT 4.0 UsersFor Macintosh Users Installation Installing the Dual 56K LAN Modem Pass-through Phone ports You may need to use a country-speciﬁc phone adapter optional Power Cable Connection Installing the Dual 56K LAN Modem Main Steps for Typical Conﬁguration Configuring the Dual 56K LAN Modem for Internet Access Initial Conﬁguration Welcome Window Welcome message appears, as shown in Figure Set Password Window ISP Wizard appears Click Continue Click Continue LAN Modem Support Web Site Changing the LAN Modem IP Address for Static IP Users LAN Modem Main Configuration Links From the Illustration Providers You may wish to bookmark this page for easy future access 10-User Shared WAN Connection Using an 8-Port Ethernet Hub Connecting an External Hub to the Dual 56K LAN Modem 10BASE-T Hub-to-LAN Modem Connection Configuring the Dual 56K LAN Modem for Internet Access Displayed on your computer Before You StartConﬁguration Click Continue If do not wish to enter a Password, leave the ﬁelds empty Page Service Provider Selection Window Private Network Parameters Window Under Miscellaneous, make the following selections IP Address and Subnet mask ﬁelds are mandatoryPage Setting Up Additional Service Provider Proﬁles Dual 56K LAN Modem Main Conﬁguration Providers LAN Modem Connecting an External Hub to the Dual 56K LAN ModemSupport Web Site Modem as they become available Additional Service Advanced ConfigurationAdvanced Conﬁguration Conﬁguring Advanced Configuration Internet Service Provider Parameters window appears Advanced Configuration Click Submit Associating Service Editing ServiceProvider Proﬁles Providers with Using a Connection Script Connection Script Command Syntax Click Transmit ButtonsClick Set Port Connection Script Example Additional Conﬁguration Buttons Parameters Conﬁguring LANEthernet Parameters window is shown in Figure Parameters Name NetBIOS Filtering Enable Dhcp ServerLocal Domain Name Parameters Modem Control Parameter Description Modem Control Controls Data Call Parameters Window Bandwidth on Demand Parameters Timeout Values Call Parameters Outgoing Call Control Advanced Configuration Reserving Dhcp PasswordAddresses Changing Your Advanced Configuration Conﬁguring the LAN Modem from a Remote Location Using SelectivePassword Protection Conﬁguring the LAN Modem Remotely via Another LAN Modem Administration Password Double-clickMake New Connection Click TCP/IP SettingsAnalog Modem Click Check for Upgrades Basics Configuring the Dual 56K LAN Modem for DIAL-IN SupportServer-side LAN Modem and a client-side device Adapter or an Isdn LAN Modem Configuring the Dual 56K LAN Modem for DIAL-IN Support Single User Dial-in from an Analog Modem LAN Modem Site-to-Site Dial-in Proﬁle Type Before You Start the Conﬁguration Click Dial-in User Dial-In Global Parameters window opens, as shown in Figure Click Dial-in GlobalPage Dial-in Wizard for Single User Dial-in Dial-In Wizard Proﬁle Type Selection Window Dial-In Wizard Password Window Dial-In Wizard Password window appears, as shown in Figure Modem Site-to-Site Dial-in Dial-In Wizard Internet Service Provider Window Dial-In Wizard Password Window Dial-In Wizard Site Assignment Window Dial-in Conﬁguring an Analog Modem for Dial-out Calling Part II. Conﬁguring a Client Device for Dial-out Access Modem LAN Modem UsingConﬁguring a LAN Creating a Private Network Service Provider Proﬁle Private Network Parameters Window Under DNS Addresses, leave these values blank Configuring the Dual 56K LAN Modem for DIAL-IN Support Dial-in User Selection Screen Dial-in Users Parameters Screen WAN Parameters Callback Parameters Placing a Call from a Client-side LAN Modem Using the LAN Modem Disconnecting CallsDesktop Manager Windows only Click Place Call Call Routing Among Service ProvidersClick Submit to save your changes Click Make Call Receiving Calls Click Hangup Call Manually Idle Timeout Timers Minimum Call Duration PLACING, Receiving and Disconnecting Calls Unauthorized opening of the unit will void the warranty Troubleshooting MaintenanceLAN Status LEDs to isolate problems Monitoring LEDs Solutions Evaluating SymptomsSolutions Symptom Possible Cause Solution Windows 2000 and NT Windows 95Macintosh Internet Explorer Click Workstations Click the Workstation Configuration tab Documentation/interop.html Web browser may be caching older pages Finding More Resetting the Dual 56K LAN ModemInformation Contacting Technical System Statistics Description of System Statistics Last Call Information Call InformationCurrent Call Information Description Cycled SynchronizingLAN Modem Clock Synchronizing the LAN Modem Clock Troubleshooting and Maintenance Networking Primer What is a LAN Modem? What is a WAN? What is a network? Is written as Becomes Subnet Masking Appendix a Networking Primer What is a network? Appendix a Networking Primer Possible Limitations Appendix a Networking Primer Modem Application Installing and Using the VirtualFAX Modem Click Add to add the new modem Click Install ModemsModem Properties window opens Virtual Fax Modem Parameters page opens, as shown in Figure Click the Virtual Fax Modem button Usage Creating a Virtual Creating a Virtual Private Network VPN TunnelPrivate Network VPN Tunnel Run Dial-Up Networking Click the Make a New Connection icon Factory Defaults Factory Defaults Appendix D Factory Defaults Speciﬁcations SpecificationsYear 2000 Compliance Refer to for the Dual 56K LAN Modem speciﬁcations Appendix E Specifications Glossary LZS Glossary Glossary OfﬁceConnect Dual 56K LAN Modem 3Com Corporation Limited Lifetime Warranty Warranties Exclusive Regulatory and Aproval Information FCC Declaration FCC Part 68 Compliance Page TCP/IP 167 168