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Glossary and Abbreviations
Issue 5 January 1998 GL-31555-230-024
one listed directory number (LDN). A tributary switch is connected to the main switch via tie
trunks, but has its own attendant positions and LDN.
maintenance
Activities involved in keeping a telecommunications system in proper working condition: the
detection and isolation of software and hardware faults, and automatic and manual recovery from
these faults.
management terminal
The terminal that is used by the system administrator to administer the switch. The terminal may
also be used to access the BCMS feature.
major alarm
An indication of a failure that has caused critical degradation of service and requires immediate
attention. Major alarms are automatically displayed on LEDs on the attendant console and
maintenance or alarming circuit pack, logged to the alarm log, and reported to a remote
maintenance facility, if applicable.
Manual-In work mode
One of four agent work modes: the mode in which an agent is ready to process another call
manually.
See
Auto-In Work mode for a contrast.
MAP
Maintenance action process
MAPD
Multiapplication platform for DEFINITY
MA-UUI
Message-Associated User-to-User Signaling
Mbps
Megabits per second
M-Bus
Memory bus
Mbyte
Megabyte
MCC
Multicarrier cabinet
MCS
Message Center Service
MCT
Malicious Call Trace
MCU
Multipoint control unit
MDF
Main distribution frame
MDM
Modular data module
MDR
Message detail record