Avaya S8700 Maintenance Manual page 100

Alarms, Errors, and Troubleshooting
If DS1Cs exist on the fiber link (check with list fiber-link), then additional
DS1CONV loopback tests can be run to further isolate the problem. The loopback
tests are shown in
Loopback tests (#788 and #789), see:
''Far-End DS1 Converter Circuit Pack Loopback Test (#788)'' on page
8-707
''Far-End Lightwave Transceiver Loopback Test (#789)'' on page 8-709
For more information about DS1 Facility Loopback tests (#797 and #799), see:
''Far-End Internal Loop-Back Test (#797)'' on page 8-676
''Near-End External Loop-Back Test (#799)'' on page 8-679
DS1C
1
Tests 788, 780, 797,
and 799 start here:
Figure 4-5. DS1 CONV Loopbacks
4-26 Issue 1 May 2002
Figure 4-5. For more information about
Test 799 Test 799
LB 1 LB 2
CSU 1
DS1 Facility
DS1 CONV-BD
Test 797 loops at internal
interface for the DS1 facility
. . . . . .
.
. .
DS1C
. .
2
CSU 2
. .
. .
. . . .
Test 788
loops here
lightwave
transceiver
Test 789
loops here
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