Maintenance-Object Repair Procedures
555-233-143
8-678 Issue 1 May 2002
2500 ABORT Internal system error
1. Retry the command at 1-minute intervals up to 3 times.
FAIL Far-End Internal loop back failed. A problem exists between DS1 CONV A and
the internal interface for DS1 facility on the DS1 CONV B (see diagram above).
1. If the test is executed as a part of an error analysis, then return back to the
related section.
2. Enter display errors and follow the associated repair procedures for any
on-board DS1 CONV-BD errors on this DS1 CONV circuit pack and the
DS1 CONV circuit pack at the other end of the DS1 CONV complex.
3. If the network is used instead of private T1 lines, verify that the DS1 facility
and the network are using the same Line Coding. For TN574 boards and
TN1654 boards in T1 mode, also verify that the Framing Mode used is the
same. Use list fibers and display fiber-link commands to check the
values for this DS1 facility. Contact T1 Network Service to check the
modes used by the network. See the above sections, “Line Coding” and
“Framing Mode” for details on how these options apply to the TN574 and
TN1654 DS1 CONV boards.
4. Isolate the problem by running the Near-End External Loopback test
(#799) via the test ds1-facility UUCSSf external-loopback command,
first at this end and then at the other end of the DS1 CONV complex.
Setup loop backs at different points as shown in the description diagram
for Test #799, and follow repair procedures described for Test #799.
5. If the problem could not be found by near-end external loop-back tests,
then the fault should be between the CSU A and the CSU B. Contact T1
Network Service to resolve the problem, also see the repair procedures for
Error Type #1025 (loss of frame alignment).
Any PASS Transmission through the path of the loop back is successful. TN1654 DS1
facilities will display the round trip delay time in milliseconds in the Error
Code field. The round trip delay time is defined as the length of time in
milliseconds it takes for the firmware to receive the test pattern after it has been
sent.
Table 8-264. Test #797 Far-End Internal Loop-Back Test — Continued
Error
Code
Tes t
Result Description / Recommendation
Continued on next page
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