DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-786EXP-INTF (Expansion Interface Circuit Pack)
9
Figure 9-41. Fiber Link with DS1 Converter Complex
EI In-Service Mechanism
In order for calls to be routed through a given EPN, the EI that is part of the
connectivity to that EPN 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 determine if the board is recognized by software.
2. The EI must have a fiber link administered to it. Use the
list fiber-link
command to determine if this EI circuit pack has a fiber administered to it.
3. The EI must have established a LAPD link to its neighbor (the circuit pack
on the “other end” of the fiber link). This neighbor can be another EI or an
SNI (Switch Node Interface).
!
CAUTION:
If requirements 1 and 2, above, have been met, and the yellow LED s
are flashing in a manner that appears to confirm that the Expansion
Interface circuit pack has established a LAPD 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 Switch Node Interface circuit pack that is the neighbor of the
Expansion Interface circuit pack in question (see SNI-BD
Maintenance Documentation for more details).
Once an EI has been put into service, if any of the above listed “in-service”
criteria become untrue, the EI is taken out of service, and service to that port
network is not available.
METALLIC CABLE or METALLIC CABLE or
EI
EI (TN570)
(TN570)
or
SNI
(TN573)
DS1C DS1C
(TN574) (TN574)
OPTICAL FIBER OPTICAL FIBER 1 to 4 DS1 FACILITIES
