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DS1C-BD
Issue 1 June 2005 1105
Far-End Lightwave Transceiver Loopback
Test (#789)
This test is destructive.
This test is executed by the TN574 DS1 Converter circuit pack only. Test #790 covers this
testing for the TN1654 DS1 Converter.
This test starts at the DS1 converter circuit pack whose equipment location was entered and
loops at the Fiber Optic Terminator (lightwave transceiver) that is connected to the DS1
converter circuit pack at the other end of the DS1 converter complex. See the following
diagram.
FAIL Far-end DS1 converter loop back failed. A problem exists between the
DS1 converter A and the DS1 converter B (see previous diagram).
1. If there are facilities that are not digital-data compatible, busyout the
facilities via busyout ds1-facility.
2. If the test is executed as a part of an error analysis, then return back to
the related section.
3. Enter display errors and follow the associated repair procedures
for any on-board DS1C-BD errors on this DS1 converter circuit pack
and the DS1 converter circuit pack at the other end of the DS1
converter complex. Enter display errors and follow the associated
repair procedures for any DS1-FAC errors on the DS1 facilities.
4. Check the DS1 Converter Measurements Report to see if there are
facilities with excessive errors. Use list measurements
ds1-facility summary. If there are facilities with excessive errors,
execute the Far-End Internal Loopback test (#797) on those facilities,
and follow repair procedures described for the test.
5. If the test still fails, replace the DS1 converter circuit pack at the other
end of the DS1 converter complex.
6. If the test still fails, replace this DS1 converter circuit pack.
PASS Transmission through the path of the loop back is successful.
0
NO
BOARD
The system software found no board.
1. Reset the board.
2. Remotely retry the command.
Table 375: Test #788 Far-End DS1 Converter Board Loop-Back Test (continued)
Error
Code
Test
Result
Description / Recommendation
3 of 3