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Glossary
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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).
DS3/E3
Digital Signal Level 3 (44.736 Mb/s).
DS3/E3/EC-1 Circuit Pack
The DS3/E3/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 1850 TSS-5 interfaces: DS1 (1.544 Mb/s)
or DS3/E3 (44.736 Mb/s).
DSX - Digital Cross-Connect Panel
A panel designed to interconnect to equipment that operates at a designated rate. For example, a
DSX-3 interconnects equipment operating at the DS3/E3 rate.
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.
Dual Homing
A network topology in which two Alcatel-Lucent 1850 shelves serve as hosts supporting up to 8
OC-3 rings or 4 OC-12 rings. Each OC-3 and OC-12 ring is interconnected between the two
separate hosts.
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E
EC-1, EC-n - Electrical Carrier
The basic logical building block signal with a rate of 51.840 Mb/s for an EC-1 signal and a rate of
n times 51.840 Mb/s for an EC-n signal. An EC-1 signal can be built in two ways: A DS1 can be
mapped into a VT1.5 signal and 28 VT1.5 signals multiplexed into an EC-1 (VT1.5 based EC-1),
or a DS3/E3 can be mapped directly into an EC-1 (DS3/E3 based EC-1).
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GL - 1 8
Terms and Definitions
365-372-403R5.1
Issue 1 November 2008
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