Avaya Definity SI Maintenance Manual page 1555

EXP-INTF (Expansion Interface Circuit Pack)
Expansion Interface Manual Loop Back Procedure
This procedure is to be used when an Expansion Interface circuit pack cannot be
tested by software. This is usually when the Expansion Interface circuit pack is in
the EPN and the EPN is down. A spare length of fiber jumper cable is required for
this procedure.
If this procedure is run on both Expansion Interface circuit packs of a link, and
both check out fine, then the failure is most likely in the fiber itself if neither
Expansion Interface circuit pack is busied out, but the link remains inactive.
1. Busyout the Expansion Interface circuit pack using the busyout board
PCSS command.
2. Disconnect the transmit and receive fiber pair from the lightwave
transceiver on the back of the Expansion Interface circuit pack slot. Note
which is the transmit fiber and which is the receive fiber for proper
reconnection at the end of this procedure.
3. Using a spare fiber jumper cable, interconnect the transmit and receive
jacks of the lightwave transceiver as shown in
10-770
4. Go to the front of the cabinet and inspect the yellow LED.
5. Replace faulty component(s) and reconnect the original fiber. Be sure to
reconnect the fibers properly as noted in Step 3.
6. Release Expansion Interface circuit pack with release board PCSS.
555-233-123
on the following page.
If the yellow LED is on steady, this Expansion Interface circuit pack
and the lightwave transceiver are functioning properly.
If the yellow LED is off, reseat the circuit pack. For the TN776, if the
yellow LED comes on steady after the red LED has gone off, the
Expansion Interface circuit pack and the lightwave transceiver are
functioning properly. For the TN570 [G1V5], if the yellow LED is off
steady after the red and green LEDs have gone off, the Expansion
Interface circuit pack and the lightwave transceiver are functioning
properly.
If the yellow LED flashes on at a rate of once per second, the
Expansion Interface circuit pack or transceiver should be replaced.
If the yellow LED flashes on at a rate of 5 times per second, the
Expansion Interface circuit pack or the lightwave transceiver may
need replacement. This condition may also be due to a faulty
system clock on the network containing this Expansion Interface
circuit pack. Refer to the procedure described in the preceding
"Relationship Between Expansion Interface and Tone-Clock Circuit
Packs" on page 10-651 section for further details.
Figure 10-29 on page
Issue 4 May 2002 10-769