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Glossary
Issue 5 June 2000 GL-5
CVFE
Coding Violation Far-End — An indication returned to the transmitting terminal that an
errored block has been detected at the receiver terminal of a terminal other than the
one to which you are physically connected.
D
DACS III-2000
Digital Access and Cross-Connect System that provides clear channel switching at
either the DS3 or the STS-1 rates, eliminating the need for manual DSXs.
DACS IV-2000
Digital Access and Cross-Connect System that provides electronic DS3/STS-1 or DS1/
VT1.5 cross-connect capability, eliminating the need for manual DSXs.
DCC
Data Communications Channel — The embedded overhead communications channel
in the SONET line. It is used for end-to-end communications and maintenance. It car-
ries alarm, control, and status information between network elements in a SONET net-
work.
DCE
Data Communications Equipment — In a data station, the equipment that provides the
signal conversion and coding between the Data Terminating Equipment (DTE) and the
line. The DCE may be separate equipment or an integral part of the DTE or of interme-
diate equipment. A DCE may perform other functions usually performed at the network
end of the line.
DDM-1000
Lucent Technologies’s Dual DS3 Multiplexer — A digital multiplexer that multiplexes
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 elec-
tronics 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 direc-
tion" is from the fiber toward the DSX.
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