5-2 List Of Terms - Northern Telecom DMS-100 Series Maintenance Manual

5-2 List of terms

DS30A link
A 32-channel transmission link between the line concentrating module and
the controllers, for example, a PCM30 line group controller, in the
DMS-100 Family.
Dual-tone multifrequency (DTMF) signaling
DTMF is a signaling method that employs set combinations of two specific
voice-band frequencies. One frequency is selected from a group of four low
frequencies, and the other frequency is selected from a group of three or four
relatively high frequencies.
Erlang
An international unit of the average traffic intensity (occupancy) of a facility
during a period of time, usually a busy hour.
Frame supervisory panel (FSP)
An FSP accepts the frame battery feed and ground return from the power
distribution center and distributes the battery feed, through subsidiary fuses
and feeds, to the shelves of the frame or bay in which it is mounted. The
FSP also contains alarm circuits.
LEN
See Line equipment number (LEN)
Line concentrating array (LCA) shelf
An LCA shelf is a unit contained in a line concentrating module (LCM). It
consists of a power converter, an LCM processor card, a digroup control
card, and a maximum of five line drawers, either PCM30 or standard line
drawers.
Line concentrating equipment (LCE) frame
An LCE frame is a single-bay frame that contains two line concentrating
modules, as well as baffle and fuse panels and a frame supervisory panel.
Line concentrating module (LCM)
An LCM is a peripheral module that performs low-level functions, for
example, line scanning and ringing. It interfaces a maximum of 600 digital
exchange lines or 640 analog lines with the line group controller.
Line equipment number (LEN)
A LEN is a seven-digit function reference that identifies line circuits.
297-2101-504 Standard 02.01 December 1991