DS1 CONV-BD
Issue 1 May 2002
8-707555-233-143
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. 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 all fiber time slots at the far edge Fiber Optic Interface of the
DS1 CONV circuit pack at the other end of the DS1 CONV complex. See Figure
8-32.
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 administered 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), test can be executed at any DS1 CONV circuit pack.
Figure 8-32. Far-End DS1 CONV Loop-Back Test (#788)
Metallic or Fiber Connection
Metallic or Fiber Connection
Loops here
DS1CONVDS1CONV
B
Network
A
Test starts here
or
SNI
EI
or
SNI
EI
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