Nortel DMS-100 Series Maintenance Manual page 128

3-6 ESA maintenance overview
NT6X45AF – ESA processor card
This card is the same processor card used in the LTC. The LTC processor
card, when used in the RLCM equipment frame, is called the ESA processor.
NT6X47AC – 4 Mbyte memory card
This card is the same memory card used in the LTC. This card contains
4 Mbyte of memory. The system uses 3 Mbyte of memory for call
processing when the RLCM enters ESA. The 6X47AC is required for ESA
loads for BCS33 and higher.
NT6X75AA – ESA clock and tone card
This card provides the following:
NTMX45AA – ESA processor card
This card is an improvement over the NT6X45AF ESA processor. Eight
megabytes of on-card memory enable duplicate Nxx numbers in ESA mode.
This card also supports in-service firmware downloads. With this ESA
processor, the NT6X47AC ESA memory card is not needed and slot 14 of
the HIE shelf has a filler plate.
NT2X48AB – Digitone receiver card
The Digitone receiver (DTR) card is required in the RMM for ESA
operation. The ESA processor puts the DTRs in service when in ESA and
turns the DTRs off when the DTRs come out of ESA. A single card
4-channel DTR (NT2X48BB) is also used in the RMM for ESA Digitone
calls. In addition to Digitone reception, the RMM provides diagnostics for
the ESA processor. For the location of the DTR cards, refer to the figure
"Remote Maintenance Module Shelf" and the table "Remote Maintenance
Module Cards."
Additional LTC hardware
The additional hardware in feature package NTX154AA for the host LTC is
the messaging card, (NT6X69). This card allows communication with the
ESA processor.
The following figure shows the layout of the cards in the host interface
equipment shelf.
297–8351–550 Standard 04.01 August 1999
a frame pulse for clock generation during ESA mode to replace the lost
DS-1 frame pulse from the host
tones to an LCM during ESA
an interface for the ESA processor to send and receive messages to and
from the host during normal operations. During ESA mode this card
communicates with the two units of the LCM and the RMM.