General Configuration; Line Concentrating Module - Nortel DMS-100 Series Maintenance Manual

1-2 Maintenance overview

General configuration

A standard DMS-100 switch single-bay equipment frame houses the RLCM.
The RLCM frame contains the following main components:
The lower part of the frame contains the LCM. The LCM consists of two
line concentrating arrays (LCA). Cooling baffles and fuse panels
accompany the LCAs. The upper part of the RLCM frame contains the HIE
shelf, the RMM shelf, and the FSP. The FSP provides power control and
alarm circuits for the LCM, HIE, and RMM shelves. The FSP also provides
power for the ringing generators (RG) in the HIE shelf. Refer to the RLCM
frame, shelf, and panel arrangement figure for the layout of the RLCM
equipment frame.

Line concentrating module

The LCM occupies shelf positions 04 and 21 of the RLCM frame. The dual
unit LCM contains two LCA shelves. The 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 allow air circulation for
convectional cooling and carry sets of five +5V, +15 and –48V fuses for the
line drawers. These panels also carry a pair of fuses for the ringing voltage
outputs (RA, RB). Each LCA shelf has a processor, digroup controller,
power converter, and five line drawers.
Each line drawer connects a maximum of 64 line cards, one for each analog
subscriber line that the RLCM services. The 64 line cards consist of two
groups of 32. Each group of 32 line cards is a line subgroup (LSG).
The figure "RLCM Frame, Shelf, and Panel Arrangement" identifies the 10
line drawers and the 20 LSGs in the 2 LCA shelves.
The number of line drawers times the number of line cards for each drawer
determines the maximum number of lines that can connect to an RLCM.
The number of line drawers is 10. The number of line cards for each drawer
is 64. The maximum number of lines is 640.
297–8351–550 Standard 04.01 August 1999
standard two-shelf line concentrating module (LCM)
single-shelf remote maintenance module (RMM)
host interface equipment (HIE) shelf
frame supervisory panel (FSP)