Glossary
Issue 3 June 2000
GL-5
CV
Coding Violation (a performance-monitoring parameter)
CVFE
Coding Violation Far-End — An indication returned to the transmitting terminal that an errored block
has been detected at the receiving terminal.
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 carries alarm, control,
and status information between network elements in a SONET network.
DCE
Data Communications Equipment — In a data station, the equipment that provides the signal con-
version and coding between the data terminal equipment (DTE) and the line. The DCE may be sep-
arate equipment or an integral part of the DTE or of intermediate equipment. A DCE may perform
other functions usually performed at the network end of the line.
DDM-Plus
Lucent’s optical and electrical DS1 transport system. DDM-Plus transports up to four DS1s per pair
of optical fiber and can provide T1 extension over existing copper wires.
DDM-1000
Lucent's Dual DS3 Multiplexer — A digital multiplexer that multiplexes DS1, DS1C, or DS2 signals
into a DS3 signal or a 90 Mb/s or 180 Mb/s optical signal.
DDM-2000
Lucent's next generation network multiplexers that multiplex DS1, DS3, or EC-1 inputs into EC-1,
OC-1, OC-3, or OC-12 outputs.
Default Provisioning
The parameter values that are preprogrammed as shipped from the factory.
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 DEMUX direction" is from the fiber toward the DSX.
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