Alcatel-Lucent 1850 TSS-60 Installation And System Turn-Up Manual page 376

Terms and definitions
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Line Timing
The capability to directly derive clock timing from an incoming OC-N signal while providing
theuser the capability to provision whether switching to an alternate OC-N from a different source
(as opposed to entering holdover) will occur if the OC-N currently used as the timing reference for
that NE becomes unsuitable as a reference. For example, intermediate nodes in a linear network are
line timed. See Loop Timing.
Local
See Near-End.
Locked Cross-Connection
This is a variation of the ring cross-connection that allows the user to lock the path selector to a
specified rotation of the ring. Any signal received from the other rotation of the ring is ignored.
LOF - Loss of Frame
A failure to synchronize to an incoming signal.
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 reciever without
regeneration. See Intermediate Reach.
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M
Main
The two slots (M-1 and M-2) on the Alcatel-Lucent 1850 TSS-60 shelf in which the OC-3 or OC-12
main 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.
Multiplexing
The process of combining several distinct digital signals into a single composite digital signal.
Mult - Multipling
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.
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GL - 2 2
365-372-603R2.0
Issue 1 January 2009