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 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. When the connection to the Expansion Interface
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 of 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 fiber itself, assuming neither endpoint circuit
pack is busied out and the link remains inactive.
1. Busyout the circuit pack (Expansion Interface or Switch Node Interface)
using the
busyout board UUCSS
command.
2. Disconnect the transmit and receive fiber pair from the lightwave
transceiver on the back of the circuit pack (Expansion Interface or Switch
Node Interface) slot.
NOTE:
The fiber connected to the transmit side of the lightwave transceiver
on one Expansion Interface 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 9-42
.
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.
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.
■ If the yellow LED flashes on at a rate of five times per second, the
circuit pack (Expansion Interface or Switch Node Interface) 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.
