Lucent Technologies Metropolis DMXplore, Руководство по установке, Страница: 319 / 330

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G L O S S A R Y
G L - 2 3
365-372-334 R2.0
Issue 4, November 2004
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L LBO - Line Build Out
An equalizer network between the Metropolis
®
DMXplore and the DSX panel. It
guarantees the proper signal level and shape at the DSX panel.
LED - Light Emitting Diode
Used on a circuit pack faceplate to show failure (red) or service state. It is also used
to show the alarm and status condition of the system.
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.
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.
M Main
The two slots (M-1 and M-2) on the Metropolis
®
DMXplore 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.