Alcatel-Lucent 1665 Installation Manual page 392

Glossary
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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, 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.
Digital Multiplexer
Equipment that combines time-division multiplexing several digital signals into a single composite
digital signal.
DRI - Dual Ring Interworking
Two ring networks interconnected at two common nodes.
Drop and Continue
A technique that allows redundant signal appearances at two central offices in a DRI network,
allowing protection against central office failures.
DS1
Digital Signal Level 1 (1.544 Mb/s).
DS1(28) Circuit Pack
The DS1(28) circuit pack interfaces to the DSX-1 panel.
DS3
Digital Signal Level 3 (44.736 Mb/s).
DS3/EC-1 Circuit Pack
The DS3/EC-1 circuit pack interfaces to the DSX-3 panel.
DSn - Digital Signal Rate n
One of the possible digital signal rates at Alcatel-Lucent 1665 DMX interfaces: DS1 (1.544 Mb/s)
or DS3 (44.736 Mb/s).
DSNE - Directory Services Network Element
A designated network element that is responsible for administering a database that maps network
element names (TIDs) to addresses (NSAPs - network service access points) in an OSI subnetwork.
There can be one DSNE per ring. Can also be a GNE.
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GL - 1 8
Terms and definitions
Alcatel-Lucent 1665 DMX R9.0
365-372-304R9.0 Issue 2
July 2010