Avaya S8700 Maintenance Manual page 1490

Maintenance-Object Repair Procedures
METALLIC CABLE or
OPTICAL FIBER
EI
(TN570)
or
SNI
(TN573)
Figure 8-38. Fiber Link with DS1 Converter Complex
EI In-Service Mechanism
In order for calls to be routed through a given PN, the EI that is part of the
connectivity to that PN must be put into service. In order for an EI to be put into
service, the following criteria must be met:
1. The EI must be recognized by software (inserted). Use the list config
carrier command to verify that the board is recognized by software.
2. The EI must have a fiber link administered to it. Use the list fiber-link
command to verify that this EI circuit pack has a fiber administered to it.
3. The EI must have established a LAP-D link to its neighbor (the circuit pack
on the "other end" of the fiber link). This neighbor can be another EI or an
SNI.
!
Once an EI has been put into service, if any of the previously listed in-service
criteria become untrue, the EI is taken out of service, and service to that port
network is not available.
In a system that is configured with PNC duplication active, taking an EI out of
service that is on the active PNC will, if all other things on the active and standby
PNC are equal (i.e., both PNCs are equally healthy, the standby PNC is not
busied out, the PNC is not locked by software), result in a PNC interchange.
8-768 Issue 1 May 2002
1 to 4 DS1 FACILITIES
DS1C
(TN574)
CAUTION:
If previous requirements 1 and 2 have been met, and the amber
LEDs are flashing in a manner that appears to confirm that the EI
circuit pack has established a LAP-D link to its neighbor, the circuit
pack still may not be "in service". The requirement is that it must
have the CORRECT neighbor on the other end of the fiber. Care
must be taken when connecting the fibers to the back of the carriers
so that fibers are connected to the correct circuit packs. In a Center
Stage Switch configuration, run the "configuration audit" test against
the SNI circuit pack that is the neighbor of the EI circuit pack in
question (see ''SNI-BD (SNI Circuit Pack)''
METALLIC CABLE or
OPTICAL FIBER
DS1C
(TN570)
(TN574)
for more details).
555-233-143
EI