List of terms 239

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.

Nortel Integrated Conference Bridge Service Implementation Guide

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Nortel Networks 555-4001-135, 553-3001-358 manual Len, Main DN