GL-6
Issue 9 October 1998
363-206-204
GLOSSARY
DDM-1000
Lucent Technologies’s Dual DS3 Multiplexer — A digital multiplexer that multi-
plexes DS1, DS1C, or DS2 signals into a DS3 signal or into an optical signal.
DDM-2000
Lucent Technologies’s network multiplexer that multiplexes DS1, DS3, or EC-1
inputs into EC-1, OC-3 or OC-12 outputs.
Default Provisioning
The parameter values that are preprogrammed into a circuit pack, shelf or other
electronics before it is shipped from the factory. Usually, these values can be set to
other values in the field, if desired.
Demultiplexing
A process applied to a multiplexed signal for recovering signals combined within it
and for restoring the distinct individual channels of these signals.
DEMUX
Demultiplexer - The electronics that accomplishes demultiplexing. "the DEMUX
direction" is from the fiber toward the DSX.
Digital Multiplexer
Equipment that combines by time-division multiplexing several digital signals into
a single composite digital signal.
DPLL
Digital Phase-Locked Loop.
DRI
Dual Ring Interworking.
DS1
Digital Signal Level 1 (1.544 M/bs.) This level contains24 DS0 (24 digitized voice
channels at 64 kBs/s each) channels plus overhead.
DS1 Circuit Pack
The DS1 interface circuit pack that is inserted into the OS-3 shelf and interfaces to
the DSX-1 panel.
DS3
Digital Signal Level 3 (44.736 M/bs). This level contains 28 DS1 signals plus over-
head.
DS3 Circuit Pack
The DS3 circuit pack that is inserted into the OS-3 shelf and interfaces to the
DSX-3 panel.
DSn
Digital Signal Rate n — One of the possible digital signal rates at DDM-2000 inter-
faces: DS1 (1.544 Mb/s), DS3 (44.736 Mb/s).
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