DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506 Issue 1
April 2000
Glossary and abbreviations
1631
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 sy nchronization 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 info rmation is
transferred through 2-state voltage conditions (on the E and M leads) for analog applications and through a
single bit for digital applications.
EAS
See "Expert Agent Selection".
ECC
Error Correct Code
ECMA
European Computer Manufacturers Association
EEBCDIC
Extended Binary-Coded Decimal Interexchange Code
EFP
Electronic power feed
EI Expansion interface
EIAElectronic Industries Association