Alarms, Errors, and Troubleshooting
555-233-143
4-26 Issue 1 May 2002
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 Figure 4-5. For more information about DS1 CONV-BD
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
Figure 4-5. DS1 CONV Loopbacks
Tests 788, 780, 797,
and 799 start here:
. . . . .
.
.
.
.
.
.
.
.
.
. . . . .
Test 797 loops at internal
interface for the DS1 facility
Test 789
loops here
Test 788
loops here
lightwave
transceiver
DS1 Facility
CSU 2
DS1C
2
CSU 1
DS1C
1
Test 799
LB 1
Test 799
LB 2
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