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Glossary
GL-6 Issue 1 December 1997
DEMUX
Demultiplexer - "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.
DLC
Digital Loop Carrier
DPLL
Digital Phase-Locked Loop
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 M/bs)
DS1 Circuit Pack
The DS1 interface circuit pack interfaces to the DSX-1 panel.
DS3
Digital Signal Level 3 (44.736 M/bs)
DS3 Circuit Pack
The DS3 circuit pack interfaces to the DSX-3 panel.
DSn
Digital Signal Rate n — One of the possible digital signal rates at DDM-2000 OC-3 and
OC-12 interfaces: DS1 (1.544 Mb/s) or DS3 (44.736 Mb/s).
DSX
Digital Cross-Connect Panel — A panel designed to interconnect equipment that
operates at a designated rate. For example, a DSX-3 interconnects equipment operating
at the DS3 rate.
DT
Distant Terminal
DTE
Data Terminating Equipment — That part of a data station that serves as a data source
(originates data for transmission), a data sink (accepts transmitted data), or both.
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