Alcatel-Lucent 1665 Installation Manual page 396

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 DMX 2.5G Multiplexer 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.
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 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 DMXs serve as hosts supporting up to 16 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 can be mapped
directly into an EC-1 (DS3 based EC-1).
ECI - Equipment Catalog Item
The bar code number on the faceplate of each circuit pack used by some inventory systems.
ES - Errored Seconds
A performance monitoring parameter.
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G L - 1 8 365-372-304R7.1
Issue 1, November 2007