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DS1-BD (DS1 Interface Circuit Pack)
Issue 1 June 2005 993
Internal Loop-Around 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 technician-demanded reset board location.
All trunks on the DS1 Interface circuit pack must be busied out via the system technician
busyout board command before running the Internal Looparound test. When the Internal
Looparound test is initiated, maintenance software sends 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.
When the test is complete, the maintenance software sends a stop loop around message to the
DS1 Interface circuit pack to put the circuit pack back into the normal operation mode. All trunks
of the DS1 Interface circuit pack are restored to the in-service state after release board is
entered.
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. Verify that the board’s translations are correct. Use add ds1
location to administer the DS1 interface if it is not already
administered.
2. If board was already administered correctly, check the error log to
determine whether the board is hyperactive. If so, the board was shut
down. Reseating the board will re-initialize it.
3. If the board was found to be correctly inserted in step 1, enter
busyout board
4. Enter reset board
5. Enter release board
6. Enter test board long
This should re-establish the linkage between the internal ID and the
port.
Table 342: Test #53 SAKI Sanity Test (continued)
Error
Code
Test
Result
Description / Recommendation
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