DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Alarms, Errors, and Troubleshooting
5-24Fiber Fault Isolation Procedure
5
Did the test return
Board not inserted
for the near-end circuit pack
(nearest the SPE), or for the far-end circuit pack in a simplex PNC? If so,
replace the cabling between the DS1C circuit pack and the SNI or
EXP-INTF circuit pack.
Wait 1 minute and retest.
If the board is still not inserted, replace the DS1C circuit pack and the
EXP-INTF or SNI connected to it and go back to Step 4.
If No, check to see if any of the CSU devices are looped back.
Busyout
and
test ds1-facility UUCSS external-loop
for each DS1 facility. The
tests should fail.
If any test passes, the facility is looped back, and the loopback should be
removed. If the DS1C Complex has only one DS1 facility, this test cannot
be executed at the far-end circuit pack (farthest from the SPE).
Did test 788 pass and test 789 fail? If yes, replace the DS1C and lightwave
transceiver (if present) at the other end of the DS1C complex. See Figure
5-4 and Figure 5-5. Go back to Step 4.
If No, did test 788 fail or abort and test 789 fail or abort? If yes, execute
test ds1-facility UUCSS long
command for each administered and
equipped DS1 facility.
If No, did test 797 fail?
If Yes, run the
test ds1-facility UUCSS external-loopback
command for
each administered and equipped DS1 facility.
This test requires manually altering the external connections of the DS1
facility. Place the loopbacks at as many points as your CSU capabilities
will allow (see Figure 5-5
).
■ If Test #799 fails at LB1, problem is with DS1C #1, CSU #1, or the
connections in between.
■ If test 799 passes at LB1 and fails at LB2, the problem is with CSU
#1.
■ If test 799 passes at LB1 and at LB2, the problem is with the DS1
facility, CSU #2, connections to CSU #2, or DS1C #2.
SNI/EI Manual Loop Back Procedure
Use this procedure to isolate a fault in the cables or lightwave transceivers of
SNI/EI links. (Do not use this procedure on a connection with a DS1C as an
endpoint.) By performing the loopback at both endpoints and, if applicable, at
the cross-connect field, the failure point can be identified. If both endpoints pass,
but the link remains inactive (with the boards not busied out), the fault should lie
in the cabling in between. If the test passes at a transceiver, but fails at the
cross-connect field, the cable or connectors in between are at fault.
