DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
Maintenance Object Repair Procedures
9-798EXP-INTF (Expansion Interface Circuit Pack)
9
If the red LED remains lit, see the Note under ‘‘Expansion Interface LEDs’’ above.
Expansion Interface Manual Loopback Procedure
This procedure is to be used whe n an Expansion Interface circuit p ack cannot be
tested by software. This is usually when the Expansion Inter face circuit p ack is in
the EPN and the EPN is down. When the connection to the Expansion Interface
circuit pack is via fiber, a short length of op tical fiber is required for this
procedure. If a metallic cable is used in the c onnection, the metallic c onnector
must be removed from the bac k of the carrier, and a lightwave transc eiver
connected in its p lace. The short length of optic al fiber can then b e used.
If this procedure is run on b oth endpoints of a fiber link (Expansion Interface
circuit packs or Switch Node Interface circ uit packs), and b oth check out fine,
then the failure is most likely in the fiber itself, assuming neither endpoint c ircuit
pack is busied out and the link remains inactive .
1. Busyout the circuit pac k (Expansion Interface or Switch Nod e Interface)
using the busyout board UUCSS command.
2. Disconnect the transmit and receive fiber pair from the lig htwave
transceiver on the back of the circuit pack (Exp ansion Interface or Switch
Node Interface) slot.
NOTE:
The fiber connected to the transmi t side of the lightwave transceiver
on one Expansion Interface circui t pack should be c onnected to the
receive side of the lightwave trans ceiver on the circuit p ack on the
opposite end of the fiber.
3. Using a fiber jumper c able, interconnect the tra nsmit and receive jacks of
the lightwave transceiver as shown in Figure 9-42.
NOTE:
Make sure that the total length of the fiber jump er cable does no t
exceed the maximum length recommended for the fib er link
connections between c abinets. Using ca ble lengths not within
connectivity guid elines can adversely affec t test results.
4. Go to the front of the cabinet and insp ect the yellow LED.
■If the yellow LED flashes on at a rate of once per second , the
(Expansion Interface or Switch Node In terface) circuit p ack or
transceiver should be rep laced.
■If the yellow LED flashes on at a rate of five times per second , the
circuit pack (Exp ansion Interface or Switch Node Inter face) or the
lightwave transceiver may need replacement. This condition m ay
also be due to a faulty system c lock on the network containing this
Expansion Interface circu it pack.