Glossary
GL-6 Issue 3 June 2000
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 inter-
faces: 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. There can also be
a GNE.
DSX
Digital Cross-Connect Panel — A panel designed to interconnect equipment that operates at a des-
ignated rate. For example, a DSX-3 interconnects equipment operating at the DS3 rate.
DSXBIU
Digital Signal Cross-Connect Backplane Interface Unit
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.
Dual 0x1 Cross-Connection
In a single-homed application, the DDM-2000 OC-3/OC-12 Multiplexer uses a dual 0x1 cross-con-
nection to map the VT1.5 channels between the DDM-2000 FiberReach OC-3 and the DDM-2000
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