Fault Isolation for Fiber Links
Issue 1 May 2002
4-25555-233-143
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 ‘‘EXP-INTF
(Expansion Interface Circuit Pack)’’ on page 8-762.
Figure 4-4. Tests for Isolating Fiber Faults
Tone
Clock
Tone
Detector
Test
#242
fiber-optic
cable
TDM BUS back skin
of cabinet
lightwave
transceivers
TN753
Switch
Node
Interface
Test
#757
Test
#756
TN570
Expansion
Interface
back skin
of cabinet
Test #989 (framing)Test #238 (framing)
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