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Monitoring and Testing
4-12
3162-A2-GB20-30
March 1999
Table 4-6. Troubleshooting (2 of 2)
Symptom SolutionsPossible Cause
Message OOF at DTE
appears
1. Incompatible framing
format between the
Drop/Insert port on the
customer premises
equipment and the
DSU/CSU.
2. DTE Drop/Insert (DSX-1)
cabling problem.
1. Check that the framing
format for the DTE
Drop/Insert (DSX-1)
interface is correct.
2. Check that the DTE
Drop/Insert (DSX-1)
cable is securely
attached at both ends.
Message
Yellow at Network
appears
1. Network cable problem.
2. Far-end device has lost
framing sync on the line.
3. Facility problem.
1. Check that your network
cable is securely
attached at both ends.
2. Check the status of the
far-end device.
3. Contact your facility
provider.
Message
Yellow at DTE appears
DTE has detected an LOS
or LOF condition.
1. Check the status of the
DTE.
2. Check that the DTE
Drop/Insert (DSX-1)
cable is securely
attached at both ends.
Message
AIS at Network
appears
1. Upstream device is
transmitting an AIS.
2. The network is
transmitting an AIS.
1. Check the status of the
upstream device(s).
2. Contact your facility
provider.
Message
AIS at DTE
appears
DTE is sending an AIS. Check the DTE.
Message EER at
Network appears
Facility problem. Contact your facility
provider.
BPV LED is ON 1. Incompatible line coding
format between the DTE
and the DSU/CSU.
2. DTE Drop/Insert (DSX-1)
cable problem.
1. Check that the line
coding format for the
DTE Drop/Insert (DSX-1)
interface is correct.
2. Check that the DTE
cable is securely
attached at both ends.
A failure message appears
followed by an 8-digit code
(
x
x
x
x
x
x
x
x
)
Internal DSU/CSU problem. Record the 8-digit code,
then contact your service
representative.