Demand test descriptions and error codes - Avaya Support

Figure 29: Fiber Link with DS1 Converter Complex
EI
(TN570)
or
SNI
(TN573)
EI In-Service Mechanism
EXP-INTF (Expansion Interface Circuit Pack)
METALLIC CABLE or
METALLIC CABLE or
OPTICAL FIBER 1 to 4 DS1 FACILITIES
OPTICAL FIBER
DS1C DS1C
(TN574) (TN574)
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 list config carrier to verify
that the board is recognized by software.
2. The EI must have a fiber link administered to it. Use list fiber-link to verify that 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.
! CAUTION:
CAUTION: If previous requirements 1 and 2 have been met, and the amber LEDs are
flashing in a mer that appears to confirm that the EI 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 SNI circuit pack that is
the neighbor of the EI circuit pack in question (see SNI-BD (SNI Circuit Pack) for
more details).
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 PN 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.
EI
(TN570)
Issue 5 May 2009 431