Line Concentrating Module - Nortel DMS-100 Series Maintenance Manual

OPAC hardware 5-7
The voice frequency (VF) and T1 lines connect to the electronics
compartment through NTRX65 Service Protection Center (SPC) modules.
These modules provide surge and lightning protection and electromagnetic
interface (EMI) filtering for the cable connections to the electronics shelves.
Ten SPC modules, or 1000 pairs are possible.
The SPC modules include integral cables with BIX or screw-down
connectors on the end. The connectors secure to a swinging gate. The
swinging gate is part of the serving area interface (SAI). The connectors
accept the wires that enter from outside the cabinet.
Four openings provide cable entry. One conduit is provided for a remote
ground. The NT BIX provides for 1100 outside plant cable pairs.

Line concentrating module

The LCM NT8X04AB, is the basic design building block of the remote
peripheral group. The OPAC connects to the host network over two to six
DS-1 links through a connection controller peripheral. A line group
controller (LGC), a line trunk controller (LTC), or a remote cluster
controller (RCC) are connection controller peripherals.
When the LCM is connected to DS-1 links, the LCM can function at a
distance. DS30A ports of the LCM are mapped to DS-1 interface cards that
connect to the host office. These DS30A ports are on the digraph control
cards (DCCs) of the LCM.
The LCM contains two shelves that are one above the other at the top of bay
0, that hold LCAs. Each LCA consists of a maximum of five line drawers
NT6X05AA. A completely equipped LCM contains ten line drawers. An
LCM supports up to 640 subscriber lines when completely 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 control over the
LCM. If one power converter fails, the power converter that remains can
supply power to all line cards of the LCM.
The OPAC contains a dual-unit LCM NT8X04AB, mounted in an LCM
shelf assembly NT8X0401. The NT8X04AB contains processor cards with
64 kb of memory, that require the LCM software load. The LCM software
load has 256 kb of memory that requires the extended-memory LCM
(XLCM) software load.
DMS-100 Family OPAC Maintenance Manual XPM12 and up