Filter
Top Products
EXP-INTF (Expansion Interface Circuit Pack)
Issue 1 June 2005 1181
Figure 65: 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 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 manner 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) on page 2046 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.
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