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Messages and Troubleshooting
6-3
7520-A2-GB20-20 May 1998
Troubleshooting
This DSU is designed to provide you with many years of trouble-free service. If a
problem occurs, however, refer to Table 6-2 for
possible solutions.
Table 6-2. Troubleshooting (1 of 2)
Symptom Possible Cause Solutions
Alarm LED is on. One of several alarm
conditions exists. Health
and Status displays the
alarm condition. Refer to Table 4-2, Health and
Status Messages , for
recommended action.
Cannot access the
DSU via the ATI. The terminal is not set up
for the correct rate or data
format, or the DSU is
configured so it prevents
access. Check the cable and
connections.
Set up your terminal or PC
emulation as shown in
Connecting to the Terminal Port
in Chapter 2.
Power the DSU on and off and
try again.
Device Fail appears
on the System and
Test Status screen
under Self-Test
results. The DSU detects an
internal hardware failure. Power the DSU off and on and
try again.
Contact your service
representative.
An LED is not lit. LED is burned out. Run the Lamp test. If the LED in
question does not flash with the
other LEDs, then contact your
service representative.
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.
Excessive data
errors. Incorrect cable type
Bad cable
Improper configuration
If getting Excessive BPVs, verify
that you do not have a bad cable.
If the cable is good, contact the
network provider.
p
Enable the Invert Transmit Clock
configuration option. See
Table A-3,
Data Port Options , in
Appendix A.