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DS1C-BD
Issue 1 June 2005 1103
Far-End DS1 Converter Circuit Pack
Loopback Test (#788)
This test is destructive.
This test is executed by the TN574 DS1 Converter circuit pack only. See Test #790 for testing
for the TN1654 DS1 Converter.
This test starts at the DS1 converter circuit pack whose equipment location was entered, and
loops all fiber time slots at the far edge Fiber Optic Interface of the DS1 converter circuit pack at
the other end of the DS1 converter complex. See Figure 58: Far-End DS1 Converter
Loop-Back Test (#788) on page 1103.
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 administered DS1 facility
channel. Two different test patterns are used: hexadecimal values 55 and AA.
For a standard-, 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
converter circuit pack, because of its impacts on the system control links, The completion of the
test is delayed in this configuration to wait for the recovery of the system control links. For a
critical-reliability system (PNC duplication), test can be executed at any DS1 converter circuit
pack.
Figure 58: Far-End DS1 Converter Loop-Back Test (#788)
Table 375: Test #788 Far-End DS1 Converter Board Loop-Back Test
Error
Code
Test
Result
Description / Recommendation
2000 ABRT Timed out while waiting for a response from the circuit pack.
1. Retry the command at 1-minute intervals up to 3 times.
1 of 3
Metallic or Fiber Connection
Metallic or Fiber Connection
Loops here
DS1CONVDS1CONV
B
Network
A
Test starts here
or
SNI
EI
or
SNI
EI