Avaya S8700 Maintenance Manual page 99

Fault Isolation for Fiber Links
Test #242 can be run as part of the test board UUCSS long command for an EI
circuit pack. Besides testing on-board components, this test is helpful for isolating
problems between a circuit pack and the lightwave transceiver. The loopback
shown in this diagram shows only part of what Test #242 does. If no lightwave
transceiver is connected to the EI circuit pack, an on-board loopback is performed
on the EI circuit pack. For more information about Test #242, see
(Expansion Interface Circuit Pack)'' on page
TDM BUS
Tone
Clock
TN570
Expansion
Interface
Tone
Detector
Figure 4-4. Tests for Isolating Fiber Faults
555-233-143
back skin
of cabinet
Test
#242
Test #238 (framing)
8-762.
fiber-optic back skin
cable of cabinet
Test
#756
lightwave Test #989 (framing)
transceivers
Issue 1 May 2002
''EXP-INTF
TN753
Test
Switch
#757
Node
Interface
4-25