Nortel DMS-100 Series Maintenance Manual page 202

5-2 OPM hardware
The LCM contains two shelves called line concentrating arrays (LCA). Each
LCA contains five line drawers. A fully equipped LCM contains ten line
drawers. An LCM supports 640 subscriber lines when the LCM is fully
equipped. Each LCA has a control complex, processor and digroup control
and power converter. The control units operate in a load sharing mode. If one
of the processors fails, the mate processor takes over complete control of the
LCM. If one power converter fails, the power converter that remains can
supply power to all line cards of the LCM.
The OPM contains a dual-unit LCM (NT6X04AA or NT6X04AB), mounted
in an LCM shelf assembly (NT6X0401). The NT6X04AA contains
NT6X51AA processor cards with 64 kbyte of memory and requires the LCM
software load. The NT6X04AB contains NT6X51AB processor cards with
256 kbyte of memory that requires the extended memory LCM (XLCM)
software load. The circuits contained in the LCM are as follows:
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Line cards
Each of the ten line drawers of the LCM contains a pair of line subgroups
(LSG) and a single bus interface card (BIC). Each LSG contains 32 line cards
that support a maximum of 640 subscriber lines. The subscriber line card
types the OPM supports are as follows:
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297-8361-550 Standard 04.01 September 2000
NT6X53AA—Power converter 5V/15V
NT6X51AA, AB—LCM processor and extended LCM processor
NT6X52AA—Digroup controller
NT6X54AA—Bus interface card (BIC) (up to ten)
A maximum of 640 line cards
NT6X17AA, AB, AC—Standard line card type A or NT6X17BA—World
line card
NT6X18AA, AB—Line card type B with and without +48 V (coin, PBX,
and ground-start)
NT6X19AA—Message waiting line card
NT6X20AA—Message waiting power converter
NT6X21AA, AB, AC—Standard line card type C and Meridian business
set line card
NT6X71AA, AB, AC—Data line card (DLC) DMS-100/SC-100
NT6X99AA Integrated bit error rate test (IBERT) line card