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Glossary
GL-12 Issue 3 June 2001
Loop Timing
Loop timing is a special case of line timing. It applies to NEs that have only one OC-N
interface. For example, terminating nodes in a linear network are loop timed. See Line
Timing.
LOP
Loss of Pointer — A failure to extract good data from an STS-1 payload.
LOS
Loss of Signal — The complete absence of an incoming signal.
LR
Long Reach. A term used to describe distances of 40 km or more between optical
transmitter and receiver without regeneration. See intermediate reach.
LS
Low Speed
M
Main
Slots on the DDM-2000 shelf in which the OLIU circuit packs are installed.
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
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