3Com 3C892 Troubleshooting Maintenance, Unauthorized opening of the unit will void the warranty

TROUBLESHOOTING AND

9 MAINTENANCE

This chapter explains how to isolate and solve problems encountered with the ISDN LAN 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

■Finding more information

■Contacting technical support

■Downloading firmware

■Resetting the ISDN LAN Modem

■Reviewing statistics

CAUTION: There are no user-serviceable parts inside your ISDN LAN 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 you have a proper 10BASE-T Ethernet cable (8-pin to 8-pin)

■Verify that the power cord is connected to the ISDN LAN Modem and an electrical outlet.

■Verify that the ISDN cable is properly connected to the ISDN LAN Modem and the ISDN wall outlet.

The ISDN LAN Modem will not operate if connected to an analog telephone wall jack. Make sure that the ISDN LAN Modem is connected directly into the ISDN wall outlet without connection to any intermediate telephone equipment (an NT1 device is not required with the ISDN LAN Modem).