Avaya S8700 Maintenance Manual page 1431

DS1 CONV-BD
Table 8-274. Test #788 Far-End DS1 Converter Board Loop-Back Test — Continued
Error Test
Code Result Description / Recommendation
PASS Transmission through the path of the loop back is successful.
0 NO The system software found no board.
BOARD
1. Reset the board.
2. Remotely retry the command.
Far-End Lightwave Transceiver Loopback
Test (#789)
This test is destructive.
This test is executed by the TN574 DS1 Converter circuit pack only. Test #790
covers this testing for the TN1654 DS1 Converter.
This test starts at the DS1 CONV circuit pack whose equipment location was
entered and loops at the Fiber Optic Terminator (lightwave transceiver) that is
connected to the DS1 CONV circuit pack at the other end of the DS1 CONV
complex. See diagram below.
Every part of this test is executed under firmware control and the result is sent
back to the maintenance software. The test is executed by sending digital data
through every DS1 facility channel. Two different test patterns are used, these
are hexadecimal values 55 and AA.
For a duplex-, or high-reliability system (no PNC duplication), this test can only be
executed at the endpoint that is closer to the media server relative to the neighbor
DS1 CONV circuit pack because of its impacts on the system control links, also
the completion of the test will be delayed in this configuration to wait for the
recovery of the system control links. For a critical-reliability system (PNC
duplication), the test can be executed at any DS1 CONV circuit pack.
555-233-143
Continued on next page
Issue 1 May 2002 8-709