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DS1-BD (DS1 Interface Circuit Pack)
Issue 1 June 2005 1027
CSU Equipment Loop-Back Test (#1210)
This test is destructive.
The CSU ELB (Equipment Loopback) test causes a loop back at the near-edge of the local
120A CSU module or T1 sync splitter, and tests the connection from the TN767E DS1 board to
the CSU module/T1 sync splitter (DS1 board edge interconnecting cable, and CSU module/T1
sync splitter edge). This test will only be performed if the 120A CSU module/T1 sync splitter is
present, administered, and connected to a 1.544-Mbps TN767E DS1 circuit pack on the back of
the port carrier.
The test is destructive and can only be initiated by a technician-demanded test ds1-loop
location ds1/csu-loopback-tests.
Use busyout board to busy out all trunks or ports on the DS1 Interface circuit pack before
running the ELB test.
When the ELB test is initiated, maintenance software sends a message to the TN767E DS1
Interface circuit pack to start the test. The board sets up the ELB loop back, transmits a test
pattern, and verifies that the pattern is received unaltered through the loop back. If the
transmitted and received pattern is different, the test fails.
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 link between the internal ID and the port.
Table 353: Test #1209 DS1 Board Loop-Back Test (continued)
Error
Code
Test
Result
Description / Recommendation
3 of 3