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G L O S S A R Y
G L - 2 2
365-372-334 R2.0
Issue 4, November 2004
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Free Running
An operating condition of a clock in which its local oscillator is not locked to an
internal synchronization reference and is using no storage techniques to sustain its
accuracy.
FT-2000
Lucent’s SONET OC-48 Lightwave System.
Function Unit
Refers to any circuit pack that is designated for Function-Group-C of the
Metropolis
®
DMXplore shelf.
G
GNE - Gateway Network Element
A network element that has an active X.25 link. Can also be a DSNE.
H
Hairpin Routing
A cross-connection within the same function unit (intra-function unit).
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 DS or DS3 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.
Summary of Contents for Metropolis DMXplore
Page 8: ... C O N T E N T S v i i i 365 372 334 R2 0 Issue 4 November 2004 ...
Page 16: ... T A B L E S x v i 365 372 334 R2 0 Issue 4 Novmeber 2004 Glossary ...
Page 286: ... Backplane Pin Replacement Replacement Methods D 1 0 365 372 334 R2 0 Issue 4 November 2004 ...
Page 292: ... Installation Checklist Overview E 6 365 372 334 R2 0 Issue 4 November 2004 ...
Page 326: ... G L O S S A R Y G L 3 0 365 372 334 R2 0 Issue 4 November 2004 ...