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DS1-FAC (DS1 Facility)
Issue 1 June 2005 1075
2500 ABRT Internal system error
1. Retry the command at 1-minute intervals up to 3 times.
FAIL Near-end external loop back failed. A problem exists in the path of the loop
back.
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 DS1C-BD errors.
3. If the loop-back point is LB 1, replace connectors and cables between
the DS1 converter A and the CSU A. If the loop-back point is LB 2,
replace CSU A. Also see the repair procedure for Error Type #1025
(loss of frame alignment).
4. If the test still fails, replace DS1 converter A circuit pack.
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. This measurement is taken on the last DS1 channel tested.
Table 367: Test #799 Near-End External Loop-Back Test (continued)
Error
Code
Test
Result
Description / Recommendation
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