Troubleshooting Problems Indicated By Leds - 3Com OfficeConnect 3C892A User Manual

Troubleshooting
Problems Indicated by
LEDs
Table 8 Troubleshooting Problems Indicated by LEDs
LED LED State
ALERT LED remains
ALERT LED
lit.
ALERT LED continues
to flash.
Upon power up, both
the ALERT and ISDN
LEDs flash.
ALERT, ISDN OK, B1,
and B2 LEDs
alternately flash.
B channel LED(s) do
B1/B2
not remain green or
amber.
ISDN LED does not
ISDN LED
light.
LAN port status LED is
LAN STATUS
off (that is, not
illuminated).
Table Table 8 lists the states of ISDN LAN Modem LEDs which indicate errors and
also provides possible causes and solutions.
Possible Cause
An internal failure.
Self test failure or ISDN LAN
Modem is in firmware download
mode.
A previous firmware download
was not completed successfully.
Firmware download process was
aborted.
Problem with your computer or
application software or
incompatible local or toll
telephone company.
Poor physical connection to the
local telephone equipment.
Ethernet cable is not securely
connected.
Ethernet card is not set up
properly.
Solution
Notify your reseller or technical support that the ISDN
LAN Modem has failed the self-test.
Power cycle the ISDN LAN Modem. If the ALERT LED
continues to flash, the ISDN LAN Modem has failed the
self test. Contact your network supplier. If the ALERT
LED is not flashing, then the ISDN LAN Modem is now
operating correctly.
Download the firmware. Refer to the Readme file
located at
http://www.remoteaccess.3com.com/support/do
cs/lanmodem for firmware download instructions.
Do not remove power plug. Wait until the LEDs stop
flashing (about 1 minute) to allow the ISDN LAN modem
to cancel the firmware download. Once the LEDs stop
flashing, you may restart firmware download.
Carefully monitor the B1 and B2 LEDs while attempting
a call. These LEDs flash during call establishment and
then remain green or amber once the connection is
established.
If neither LED flashes, make sure that your computer is
turned on and operational.
If you are able to place a voice call but not a data call,
then there may be an incompatible local or toll
telephone company. Contact your local telephone
company and have it verify that you can dial a data call
to the destination telephone number.
Check the cables to ensure that they are securely
connected to the appropriate ports.
If the telephone wires at your site appear to be
satisfactory, call your local telephone company for
assistance.
Check the Ethernet cable connection and make sure it is
inserted properly in a port labeled 1,2,3,or 4 on the
back of the ISDN LAN Modem and in the Ethernet port
on the back of your computer. Also, your computer
should be turned on and your network software should
be running.
Make sure your Ethernet card is set up properly (proper
drivers are loaded). Refer to the documentation
provided with your Ethernet card for instructions.
Monitoring LEDs
93