User`s guide

6. Monitoring and Troubleshooting
6-22
May 2002 7990-A2-GB20-00
No power, or the LEDs
are not lit.
The power cord is not
securely plugged into the wall
receptacle or into the rear
panel connection.
Check that the power cord is
securely attached at both ends.
The wall receptacle has no
power.
Check the wall receptacle
power by plugging in some
equipment that is known to
be working.
Check the power switch on
the unit’s rear panel.
Check the circuit breaker.
Verify that your site is not on
an energy management
program.
Power supply has failed. Replace power supply.
Not receiving data. The network or data port
cables are not connected
(check front panel LEDs for
more information).
Check network and data port
cables.
Run loopback tests. Refer to
Chapter 7,
Testing .
A test is being executed on
the unit (check the TEST
LED on the front panel).
Stop the test or wait for the test
to end.
The far-end unit is offline. Make sure the far-end device is
on.
The far-end unit is running
atest.
Stop the far-end test.
An alarm condition exists in
the far-end unit.
Check the far-end Health and
Status messages.
Power-On Self-Test
fails. Only POWER
and ALARM LEDs are
on after power-on.
The unit has detected an
internal hardware failure.
Reset the unit and try again.
Contact your service
representative.
Table 6-6. Troubleshooting (2 of 2)
Symptom Possible Cause Solutions