Nortel DMS-100 Series Maintenance Manual page 58

1-46 Maintenance overview
RMM control card
The RMM control card (NT6X74AB), located in slot 02, is required in the
RMM. The RMM control card acts as an interface between the line
concentrating array shelves and the test trunks, service circuits, and alarm
circuits of the RMM. The RMM control card is responsible for the
processing of DMS-X messages, trunk messages, and pulse code modulation
(PCM) data.
Power converters
Two types of power converters are required in the RMM shelf, as follows:
The multi-output power converter, occupying slots 17 and 18 of the RMM,
provides a regulated, common-ground dc power supply that has five
different outputs (+24 V, +12 V, +5 V, -15V, and –5V). The other power
converter, located in slot 20, the rightmost slot of the RMM, provides a
regulated 5-V/40-A power supply to the RMM shelf.
The group codec (NT2X59AA), located at the far left of the RMM shelf in
slot 01, is a required card. It encodes analog samples from the RMM trunk
circuits into PCM code words, and decodes the PCM words from the host or
RLCM-EDC lines into analog samples.
Provisionable maintenance and service cards
Slots 03–16 of the RMM can be provisioned with various maintenance, test,
and service circuits. The number and types of these cards depend on
engineering needs. These provisionable cards are as follows:
297-8381-550 Standard 02.02 April 1999
multi-output power converter (NT2X09)
5-V/40-A power converter (NT2X06)
Remote Metallic Test Access, Remote (MTA) (NT3X09AA). The
remote MTA provides metallic connections between test access points in
the line circuits and testing equipment. It consists of a two-wire metallic
matrix with four horizontal busses and eight vertical. One horizontal bus
is connected to the MTA bus for the 320 line circuits in LCA-0 and the
other to a similar MTA bus in LCA-1. Two horizontals are unused. The
verticals are connected to service circuits or spare line circuits. Host
office circuits provide MTA functions during normal RLCM-EDC
operation.
Metallic Test Access (MTA) (NT3X09BA). The MTA performs the
same functions as the NT3X09AA, but has eight horizontal buses as well
as eight vertical buses.