Esa Hardware - Nortel DMS-100 Series Maintenance Manual

4-4 ESA maintenance overview
communicate with the DMS CC during ESA exit. The DMS CC must instruct
the ESA processor to exit ESA.
During ESA mode, the system processes calls through the ESA processor. The
ESA processor contains the ESA CC, a software module that imitates the DMS
CC and handles line-to-line call processing. The ESA CC contains a subset
of the translation data found in the DMS CC.
This subset is a snapshot of the DMS CC data needed for ESA call processing.
The translation data in the snapshot data are static data. The system does not
enter OPM ESA mode until the ESA processor is loaded with static data.
The ESA processor has a nailed-up direct communication link with the DMS
CC when the OPM 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 OPM
that can communicate with the DMS CC during ESA exit.
Download of the static data to the ESA CC from the DMS CC truncates some
translation data. Static data are not true subsets of the DMS CC and the system
only supports basic calls. During OPM ESA mode, the system supports plain
old telephone service (POTS) and Meridian Digital Centrex (MDC) subscriber
lines.

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:
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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.
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Refer to the figure below for a block diagram of an OPM with the ESA
hardware.
297-8361-550 Standard 04.02 December 2004
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