Esa Hardware - Nortel DMS-100 Series Maintenance Manual

3-4 ESA maintenance overview
This part of the DMS CC data is a snapshot required for ESA call
processing. The translations data in the snapshot are static data. The RLCM
ESA mode is not entered until the ESA processor receives static data.
The download of the static data to the ESA CC from the DMS CC truncates
some translation data. Static data are not true parts of the DMS CC and the
system only supports basic calls. During RLCM ESA mode, the system
supports plain old telephone service (POTS) and Meridian Digital Centrex
(MDC) subscriber lines.
The ESA processor has a nailed-up direct communication link with the DMS
CC when the RLCM is not in ESA operation. The link is not available
during ESA operation. The ESA processor establishes the nailed-up
connection with the DMS CC after the links are restored. The DMS CC
must instruct the ESA processor to exit ESA. The ESA processor is the only
processor at the RLCM that can communicate with the DMS CC during
ESA exit.

ESA hardware

Feature package NTX154AA for the RLCM equipment frame has two
possible configurations.
1. The NT6X45AF based ESA package consists of three pieces of
equipment:
2. The NTMX45AA based ESA package consists of two pieces of
equipment. This package includes an ESA processor that enables duplicate
Nxx in ESA mode and provides firmware downloads. This card has
8 Mbyte of on-card memory. With this package, the ESA memory card is
not needed and slot 14 has a filler plate.
For a block diagram of an RLCM with the ESA hardware, refer to the figure
"RLCM with ESA hardware block diagram."
297–8351–550 Standard 04.01 August 1999
one ESA memory card (NT6X47AC), slot 14
one ESA processor card (NT6X45AF), slot 15
one ESA clock and tone card (NT6X75AA), slot 16
one ESA processor card (NTMX45AA), slot 15
one ESA clock and tone card (NT6X75AA), slot 16