Lucent Technologies Metropolis Installation Manual page 517

Terms and Definitions
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365-372-304
Issue 7, March 2003
Holdover
An operating condition of a network element in which its local oscillator is not
locked to any synchronization reference but is using storage techniques to
maintain its accuracy with respect to the last known frequency comparison
with a synchronization reference.
I IC - Internal Clock
Used in synchronization messaging.
ID
See shelf ID and site ID.
IR - Intermediate Reach
A term used to describe distances of 15 to 40 km between optical transmitter
and receiver without regeneration. See long reach.
IS - In Service
One possible state of a DS1, DS3, or EC-1 port. Other possible states are
"auto" (automatic) and "nmon" (not monitored).
J Jitter
Timing jitter is defined as short-term variations of the significant instants of a
digital signal from their ideal positions in time.
L LBO - Line Build Out
An equalizer network between the DMX 2.5G Multiplexer 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.
Lucent Technologies - Proprietary
See notice on first page
Glossary
G L - 2 3