DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-794EXP-INTF (Expansion Interface Circuit Pack)
9
clock that was “out of spec.” Issue the
enable synchronization-switch
command. If the EPN is down, reseat the Tone-Clock circuit packs on the
EPN. This action should restore the EPN to service.
Execute Steps 3 and 4 in the order most convenient to you and least
destructive to the customer.
3. Check to see if the fiber optic cable is transmitting properly via the
following procedure on one of the out-of-service links, or use the “Fiber
Fault Isolation Procedure”
in Chapter 5.
a. Carefully record the symptoms (yellow LED pattern and test failing)
that were occurring on the PPN Expansion Interface circuit pack
and the EPN Expansion Interface circuit pack or the connected
Switch Node Interface circuit pack in the case of a Center Stage
system. Clearly indicate which symptoms are occurring on which
Expansion Interface/Switch Node Interface circuit pack.
!
CAUTION:
Before proceeding, note which is the current transmit fiber
and which is the current receive fiber for proper reconnection.
b. Disconnect the transmit and receive fiber pair from the lightwave
transceiver on the back of one of the Expansion Interface circuit
pack slots that is exhibiting symptoms.
c. Connect what was formerly the transmit fiber to the receive jack.
d. Connect what was formerly the receive fiber to the transmit jack.
e. Perform Steps b, c, and d on the opposite end of the fiber and the
lightwave transceiver on the back of the connected Expansion
Interface or Switch Node Interface circuit pack slot.
f. If the symptoms which were formerly occurring on the Expansion
Interface circuit pack that was exhibiting these symptoms are now
occurring on the connected Expansion Interface or Switch Node
Interface circuit pack and vice versa, the fiber is defective and
should be replaced.
4. Determine if the problem is due to a defective Active Tone-Clock circuit
pack. Refer to the preceding list of symptoms to decide which network
contains the suspect Active Tone-Clock.
!
CAUTION:
If you remove the EPN Expansion Interface circuit pack that is active
or that was active when the EPN was last in-service, the Tone-Clock
lead will revert to the default value which will cause the Tone-Clock
circuit pack located in the A carrier to become the Active
Tone-Clock. This characteristic can be deceiving. Replacing or
reseating the Active EPN Expansion Interface circuit pack might
restore the link(s) temporarily. However, if the Tone-Clock circuit pack
