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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Glossary and Abbreviations
Page GL-20
duplication
The use of redundant components to improve availability. When a duplicated subsystem fails, its
backup redundant system automatically takes over.
duplication option
A system option that duplicates the following: control carrier containing the SPE, EI circuit packs in
carriers, fiber-optic cabling between port networks, and center-stage switch in a CSS-connected
system.
DWBS
DEFINITY Wireless Business System
DXS
Direct extension selection
E
E1
A digital transmission standard that carries traffic at 2.048 Mbps. The E1 facility is divided into 32
channels (DS0s) of 64 kbps information. Channel 0 is reserved for framing and synchronization
information. A D-channel occupies channel 16.
E & M
Ear and mouth (receive and transmit)
EA
Expansion archangel
EAL
Expansion archangel link
ear and mouth (E & M) signaling
Trunk supervisory signaling, used between two communications systems, whereby signaling
information is transferred through 2-state voltage conditions (on the E and M leads) for analog
applications and through a single bit for digital applications.
EBCDIC
Extended Binary-Coded Decimal Interexchange Code
ECC
Error Correct Code
ECMA
European Computer Manufacturers Association
EFP
Electronic power feed
EI
Expansion interface
EIA
Electronic Industries Association