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UDS1-BD (UDS1 Interface Circuit Pack)
Issue 1 June 2005 2403
Internal Loop-Around Test (#135)
This test is destructive.
The Internal Loop-Around test is run by looping the transmitted DS1 bit stream back into the
UDS1 board’s receiver. The loop occurs just before the DS1 facility interface. The test is highly
destructive and can only be initiated by reset board location.
Each trunk or port on the UDS1 Interface circuit pack must be busied out using busyout
board before running the Internal Loop-Around test. When the Internal Loop-Around test is
initiated, maintenance software sends appropriate messages to the UDS1 Interface circuit pack
to start the test. The test uses the Tone Generator and Tone Detector to exercise a bit-pattern
consistency test for every port. If the transmitted and received bit patterns on a trunk or port are
different, the test fails.
When the test completes, the maintenance software sends a stop loop around message to the
UDS1 Interface circuit pack to put the circuit pack back into the normal operation mode. Every
trunk or port of the UDS1 Interface circuit pack is restored to the in-service state after release
board is entered.
0NO
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. Execute add ds1
location to administer the UDS1 interface if it is not already
administered.
2. If the board was already administered correctly, check the error log to
determine whether the board is hyperactive. If this is the case, the
board is 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 location.
4. Enter reset board location.
5. Enter release board location.
6. Enter test board location long.
This should re-establish the linkage between the internal ID and the port.
Table 856: Test #53 SAKI Sanity Test (continued)
Error
Code
Test
Result
Description / Recommendation
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