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1. If the Active PPN Tone-Clock circuit pack is providing an invalid system
clock:
a. The EPN Expansion Interface circuit pack yellow LED blinks quickly.
(Fiber Out-of-Frame condition).
If the EPN is up, Test #238 fails on this Expansion Interface circuit
pack.
b. The PPN Expansion Interface circuit pack yellow LED blinks slowly.
(In-frame, No Neighbor condition).
Test #237 fails on this Expansion Interface circuit pack, but Test
#238 passes.
2. If the EPN Tone-Clock circuit pack is providing an invalid system clock:
a. The PPN Expansion Interface circuit pack yellow LED blinks quickly
(Fiber Out-of-Frame condition).
Test #238 fails on this Expansion Interface circuit pack.
b. The EPN Expansion Interface circuit pack yellow LED blinks slowly
(In-frame, No Neighbor condition).
If the EPN is in-service, Test #237 fails on this Expansion Interface
circuit pack, but Test #238 passes.