Nortel DMS-100 Series Application Manual page 394

10-2 List of terms
failure rate
The rate per working unit per unit time at which persistent malfunctions of
equipment occur. Failure rate is the reciprocal of mean time between
failures (MTBF).
integrated services line module (ISLM)
A line concentrating module that supports ISDN line cards. The ISLM
works in association with the ISDN access controller.
ISLM
See integrated services line module.
LCM
See line concentrating module.
LIM
See link interface module.
line concentrating module (LCM)
A peripheral module that interfaces the line trunk controller or line group
controller and up to 640 subscriber lines, using two to six DS30A links.
line module (LM)
A peripheral module that provides speech and signaling interfaces for up to
640 subscriber lines. It consists of line drawers, a line module controller,
and a frame supervisory panel.
link interface module (LIM)
A peripheral module that controls messaging between link interface units
(LIU) in a link peripheral processor (LPP). The LIM also controls messages
between the LPP and the DMS-bus. An LIM consists of two local message
switches (LMS) and two frame transport buses (F-bus). One LMS normally
operates in a load sharing mode with the other LMS. This ensures LIM
reliability in the event of an LMS failure because each LMS has adequate
capacity to carry the full message load of an LPP. Each LMS uses a
dedicated F-bus to communicate with the LIUs in the LPP.
link interface unit (LIU)
A peripheral module that processes messages entering and leaving a link
peripheral processor through an individual signaling data link.
297-1001-330 Standard 11.04 June 1998