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Glossary:
Installation and Upgrades for G700 with S8300 or S8700
555-234-100 — Issue 3 — May 2003
333
E1
E1 is a European digital transmission format that was devised by the ITU-TS and named by the Conference of European
Postal and Telecommunication Administration (CEPT). E1 is the equivalent of the North American T-carrier system
format. E2 through E5 are carriers in increasing multiples of the E1 format. The E1 signal format carries data at a rate of
2.048 million bits per second, and can carry 32 channels of 64 Kbps each. E1 carries at a somewhat higher data rate than
T1, which carries 1.544 million bits per second. The reason for this higher rate is that E1, unlike T1, does not do bit-
robbing, and all 8 bits per channel are used to code the signal. E1 and T1 can be interconnected for international use. The
E2 signal format carries four multiplexed E1 signals with a data rate of 8.448 million bits per second. The E3 signal
format 16 E1 signals with a data rate of 34.368 million bits per second.
E2
See E1
.
E3
See E1
.
ear and mouth (E&M) signaling
Trunk supervisory signaling that is used between two communications systems. E&M 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.
EAS
See
Expert Agent Selection (EAS).
EBCDIC
See Extended Binary-Coded Decimal Interexchange Code (EBCDIC)
.
ECC
Error correct code
echo return loss (ERL)
The difference between a frequency signal and the echo on that signal as the signal reaches the destination.
ECMA
European Computer Manufacturers Association
EFP
Electronic power feed
EI
Expansion interface
EIA
See Electronics Industries Association (EIA)
.
EIA-232
A physical interface specified by the Electronic Industries Association (EIA). EIA-232 transmits and receives
asynchronous data at speeds of up to 19.2 kilobits per second over cable distances of up to 50 feet. EIA-232 replaces RS-
232 protocol in some Avaya MultiVantage applications.
EIDE
See Enhanced Integrated Drive Electronics (EIDE)
.
electromagnetic interference (EMI)
Interference in signal transmission that is caused by the radiation of electrical fields and magnetic fields.