International Line Concentrating Module; Host Interface Equipment Shelf - Nortel DMS-100 Series Maintenance Manual

International line concentrating module

The LCM occupies shelf positions 04 and 21 of the PRLCM frame. The dual
unit LCM contains two LCA shelves. LCA-0 is always the bottom array or
shelf and LCA-1 is the top array of the LCM.
Baffle and fuse panels above each LCA permit air circulation for convectional
cooling and carry sets of five +5V, +15V and -48V fuses for the line drawers,
as well as a pair of fuses for the ringing voltage outputs (RA and RB). Each
LCA shelf is equipped with a processor, digroup controller, power converter,
and five line drawers.
Each line drawer connects up to 64 line cards, one for each analog subscriber
line serviced by the PRLCM. The 64 line cards are divided into two groups of
32. Each group of 32 line cards is called a line subgroup (LSG).
The 10 line drawers and the 20 LSGs in the 2 LCA shelves are identified in the
previous figure.
The maximum number of lines (640) that may be connected to an PRLCM is
derived from the number of line drawers (10) times the number of line cards in
a drawer (64).

Host interface equipment shelf

The HIE occupies a single shelf at position 38 in the PRLCM frame. The HIE
allows the LCA shelves of the PRLCM to connect both to the RMM and to the
host office. The HIE shelf contains the following components:
• two ringing generators
• two line control cards (LCC)
• two to three PCM30 interface cards
• two power converters
• one emergency stand-alone (ESA) control complex
Ringing generators
The two ringing generators occupy slots 01 to 08 in the HIE. Each generator
is four slots wide.
The ringing generators contain the frequency circuits that generate ringing
signals to subscriber line cards on the LCA shelves.
The ringing generators also contain automatic number identification (ANI)
and coin generator circuits that check for two- or four-party ANI, and for coin
presence in prepay coin telephones.
DMS-100 Family OPM Maintenance Manual XPM14 and up
PRLCM overview 3-3