Maintenance Object Repair Procedures
555-233-123
10-626 Issue 4 May 2002
Internal Looparound Test (#135)
This test is destructive.
The Internal Looparound Test is run by looping the transmitted DS1 bit stream
back into the DS1’s board receiver. The loop occurs just before the DS1 facility
interface. The test is highly destructive and can only be initiated by a system
technician-demanded reset board UUCSS command.
All trunks on the DS1 Interface circuit pack must be busied out via the system
technician busy-out board command before running the Internal Looparound
Test. When the Internal Looparound Test is initiated, maintenance software sends
appropriate messages to the DS1 Interface circuit pack to start the test. The test
uses the Tone Generator and Tone Detector to exercise a bit pattern consistency
test for all ports. If the transmitted and received bit patterns on a trunk are
different, the test fails.
2 FAIL The circuit pack failed to restart.
1. Execute the command again.
2. If the problem persists, escalate this problem.
PASS The circuit pack initializes correctly.
1. Run the Short Test Sequence.
0 NO BOARD The test could not relate the internal ID to the port (no board).
This could be due to incorrect translations, no board is
inserted, an incorrect board is inserted, or an insane board is
inserted.
1. Check to ensure that the board translations are correct.
Use the add ds1 UUCSS command to administer the
DS1 interface if it is not already administered.
2. If board was already administered correctly, check the
error log to determine if the board is hyperactive. If this is
the case, the board is shut down. Reseating the board will
re-initialize the board.
3. If the board was found to be correctly inserted in step 1,
issue the busyout board command.
4. Issue the reset board command.
5. Issue the release busy board command.
6. Issue the test board long command.
This should re-establish the linkage between the internal ID
and the port.
Table 10-233. TEST #53 SAKI Sanity Test — Continued
Error
Code Test Result Description/Recommendation
Continued on next page
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