SNI-BD (SNI Circuit Pack)
Issue 1 May 2002
8-1437555-233-143
If software is unable to communicate with an EPN EI but can communicate with
the connected SNI:
1. Run the test board UUCSS long command on the connected SNI and fix
any problems found.
2. Perform the manual loopback procedure for the EPN EI.
When the connection to the SNI circuit pack is via fiber, a short length of
optical fiber is required for this procedure. If a metallic cable is used in the
connection, the metallic connector must be removed from the back of the
carrier, and a lightwave transceiver connected in its place. The short
length of optical fiber can then be used.
If this procedure is run on both endpoints on a fiber link (Expansion
Interface circuit packs or Switch Node Interface circuit packs), and both
check out fine, then the failure is most likely in the connection (fiber or
metallic) itself if neither endpoint circuit pack is busied out, but the link
remains inactive.
1. Busyout the circuit pack (Expansion Interface or SNI) using the
busyout board UUCSS command.
2. Disconnect the transmit and receive fiber pair from the lightwave
transceiver behind the circuit pack (Expansion Interface or Switch
Node Interface) slot.
NOTE:
Note which is the transmit fiber and which is the receive fiber
for proper re-connection at the end of this procedure. The
fiber connected to the transmit side of the lightwave
transceiver on one 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 spare fiber jumper cable, interconnect the transmit and
receive jacks of the lightwave transceiver as shown in Figure 8-84
on page 8-1438.
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. This is necessary so that
the testing of the Expansion Interface or SNI circuit pack is
done within connectivity guidelines so that test results are not
influenced due to the cable length not meeting requirements.
4. Go to the front of the cabinet and inspect the yellow LED.
■ If the yellow LED flashes on at a rate of once per second, the
(Expansion Interface or Switch Node Interface) circuit pack or
transceiver should be replaced.
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