Avaya 03-300430 User Manual

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:

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 

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