Glossary
GL-12 Issue 3 June 2000
LS
Low Speed
M
Main
Slots on the DDM-2000 shelf in which the OLIU circuit packs are installed.
Maintenance Subnetwork
A maintenance subnetwork consists of a CO (or gateway network element), a local DDM-2000 and
all remote DDM-2000s connected via SONET DCC that are enabled.
Midspan Meet
The capability to interface between two lightwave terminals of different vendors. This applies to
high-speed optical interfaces.
MD
Mediation Device
MJ
Major Alarm
MM
Multimode
MML
huMan-Machine Language defined by ITU-TSS, formerly CCITT.
MN
Minor Alarm
MPEG
Moving Picture Experts Group
MSDT
Multi-Services Distant Terminal
MTBF
Mean Time Between Failures
MTBMA
Mean Time Between Maintenance Activities
Multiplexing
The process of combining several distinct digital signals into a single composite digital signal.
Mult
Multiplying — The cascading of signals in a bay. In the MULT mode, the DS1 external reference can
be cascaded to other shelves in a bay using Mult cables. Normally starting with the bottom shelf
(Number 1) and working towards the top of the bay.
MUX
Multiplex
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