3Com 3C888 User Guide - Page 125

Troubleshooting and Maintenance, Checking the Basics, Monitoring LEDs

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10 TROUBLESHOOTING AND MAINTENANCE Checking the Basics Monitoring LEDs 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: s Checking the basics s Monitoring the LEDs s Evaluating symptoms and solutions s Finding more information s Contacting technical support s Downloading firmware s Resetting the LAN Modem s Reviewing statistics s 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. Before you monitor the LEDs or refer to the symptoms and solutions section, check the following: s Verify that the cables are not physically damaged. If damage is apparent, replace the cable. s Verify that the power cord is connected to the LAN Modem and an electrical outlet. s Verify that the analog telephone cables are properly connected to the LAN Modem and their telephone wall outlets. If you are experiencing operational inconsistencies, you can monitor the Alert and LAN Status LEDs to isolate problems.

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10
T
ROUBLESHOOTING
AND
M
AINTENANCE
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.