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EXP-INTF (Expansion Interface Circuit Pack)
Issue 1 June 2005 1191
If the red LED remains lit, see the previous note under Expansion Interface LEDs on page 1185.
Expansion Interface Manual Loop-Back Procedure
This procedure is to be used when an EI circuit pack cannot be tested by software. This occurs
when the EI circuit pack resides in an out-of-service PN. A short length of optical fiber is
required for this procedure.
If this procedure is run on both endpoints of a fiber link (EI circuit packs or SNI circuit packs),
and both check out fine, then the failure is most likely in the fiber itself, assuming neither
endpoint circuit pack is busied out and the link remains inactive.
1. Busyout the circuit pack (EI or SNI) with the busyout board location.
2. Disconnect the transmit and receive fiber pair from the lightwave transceiver on the back of
the circuit pack (EI or SNI) slot.
Note:
Note: The fiber connected to the transmit side of the lightwave transceiver on one EI
circuit pack should be connected to the receive side of the lightwave transceiver
on the circuit pack on the opposite end of the fiber.
3. Using a fiber jumper cable, interconnect the transmit and receive jacks of the lightwave
transceiver as shown in Figure 66: Interconnection of Lightwave Transceiver Transmit/
Receive Jacks on page 1192.
Note:
Note: Make sure that the total length of the fiber jumper cable does not exceed the
maximum length recommended for the fiber link connections between cabinets.
Using cable lengths not within connectivity guidelines can adversely affect test
results.
7. Wait 5 minutes for SNI-BD, SNI-PEER,
FIBER-LK, and DS1C-BD alarms to clear,
or enter clear firmware-counters
a-pnc or b-pnc.
Use the letter designation of the PNC that
holds the replaced component (the
standby PNC).
8. Enter status pnc. If either PNC’s state of health (SOH) is
not “functional,” consult PNC-DUP (PNC
Duplication) on page 1851.
9. Enter release pnc.
Step Action Explanation / Caution
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