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Glossary
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CCITT - International Telephone and Telegraph Consultative Committee
An international advisory committee under United Nations' sponsorship that has composed and
recommended for adoption worldwide standards for international communications. Recently
changed to the International Telecommunications Union Telecommunications Standards Sector
(ITU-TSS).
Channel
A logical signal within a port. For example, for an EC-1 port, there is one STS-1 channel and
sometimes 28 VT1.5 channels. See Port.
Channel State Provisioning
A feature that allows a user to suppress reporting of alarms and events during provisioning by
supporting multiple states (automatic, in-service and not monitored) for VT1.5 and STS-1 channels.
See Port State Provisioning.
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.
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D
DACS III-2000
Digital Access and Cross-Connect System that provides clear channel switching at either the
DS3/E3 or the STS-1 rates, eliminating the need for manual DSXs.
DACS IV-2000
Digital Access and Cross-Connect System that provides electronic DS3/E3/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 conversion and coding between the data
terminal equipment (DTE) and the line. The DCE may be separate 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-2000
Lucent's first generation SONET multiplexers that multiplex DS1, DS3/E3, 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.
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365-372-403R5.1
Issue 1 November 2008
Terms and Definitions
G L- 1 7
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