Messages and Troubleshooting
6-6
7110-A2-GB20-00
June 1997
Table 6-2.
Troubleshooting (2 of 2)
Symptom
Solutions
Possible Cause
No power, or the
LEDs are not lit.
The power cord is not
securely plugged into the
wall receptacle and 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 circuit breaker.
Verify that your site is not on an
energy management program.
Power supply has failed.
Replace power supply.
An LED is not lit.
LED is out.
Run the Lamp test. If the LED in
question does not flash with the
other LEDs, then contact your
service representative.
Not receiving data.
The network or data port
cables are not
connected (check front
panel LEDs for more
information).
A test is being executed
on the unit (check the
TEST LED on the front
panel).
Check network and data port
cables.
Run Loopback tests. Refer to the
Testing,
Chapter 5.
Stop the test or wait for the test
to end.
The data port is not
assigned to the network.
The far-end device is
off-line.
Check the Cross Connect Status
screen. If the data port is not
assigned to any network
timeslots, use the Cross Connect
Assignment screen (under the
Config menu) to connect the port
to the network.
Make sure the far-end device is
on.
Power-Up Self-Test
fails. Only Alarm
LED is on after
power-up.
The DSU/CSU has
detected an internal
hardware failure.
Reset the DSU/CSU and try
again.
Contact your service
representative.