List of terms 239
Nortel Integrated Conference Bridge Service Implementation Guide
flexibility to make changes to the system's parameters without
revising the hardware.
ISM
Incremental Software Management.
LAN
Local Area Network.
LED
Light Emitting Diode.
LEN
Line Equipment Number (CS 2100/Meridian SL-100 equivalent of
TN).
Main DN
The directory number that conferees dial to enter the conference
when using direct access.
MAP
Maintenance and Administration Position.
MAU
Medium Access Unit.
MMI
Man-Machine Interface.
MPU
Microprocessor Unit.
MTBF
Mean Time Between Failure. A measure of reliability: the time that a
user may reasonably expect a device or system to work before an
incapacitating fault occurs. Also, the average number of hours
between one random failure and the next under stated conditions.
MTTR
Mean Time To Repair.
OA&M
Operations, Administration, and Maintenance.
ONP
One Night Process. This is a term to define upgrades that occur over
a single night when traffic is slower than during the day.