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Monitoring and Testing
4-11
3162-A2-GB20-30
March 1999
Troubleshooting
The DSU/CSU is designed to provide you with trouble-free service. However,
Table 4-6 gives you some direction if a problem occurs.
For problems other than those listed in the table, please contact your service
representative.
Table 4-6. Troubleshooting (1 of 2)
Symptom
Possible Cause Solutions
No power 1. The power module is not
securely attached.
2. The wall receptacle has
no power.
1. Check the power module
attachment.
2. Check the wall
receptacle power by
plugging in some
equipment that is known
to be working.
Power-Up Self-Test fails The DSU/CSU has
detected an internal
hardware failure.
Contact your service
representative.
Message LOS at
Network appears
1. Network cable problem.
2. No signal is being
transmitted at the
far-end.
3. Facility problem.
1. Check that the network
cable is securely
attached at both ends.
2. Check the far-end status.
3. Contact your facility
provider.
Message LOS at DTE
appears
1. 1.DTE Drop/Insert
(DSX-1) cable problem.
2. No signal being
transmitted from the
DTE.
1. Check that the DTE
Drop/Insert (DSX-1)
cable is securely
attached at both ends.
2. Check the DTE status.
Message OOF at
Network appears
1. Incompatible framing
format between the
network and the
DSU/CSU.
2. Network cabling
problem.
3. Facility problem.
1. Check that the framing
format for the network
interface is correct.
2. Check that the network
cable is securely
attached at both ends.
3. Contact your facility
provider.