Appendix
E -
Glossary
E-3
E
Eb/No
Eb/No
Ratio
Eb
= energy per bit
No
= noise power density per Hz. The bit error
rate (BER) for digital data is a decreasing function of this ratio.
Eb
is the energy
of an information bit.
Eb
is measured in Joules, or equivalently in Watts per
Hertz.
EEPROM
E
lectrical
E
rasable
P
rogrammable
R
ead
O
nly
M
emory. This equipment
component is used to record and store data that needs to be retained when the
equipment is powered down.
E&M
E
ar
&
M
outh (literally) – The signaling leads used to carry telephone circuit
signaling or indicate circuit activity or status.
F
FDMA
F
requency
D
ivision
M
ultiple
A
ccess – A technique where multiple users can
access a common resource (e.g. satellite) by each being allocated a distinct
frequency for operation. See also TDMA.
FEC
F
orward
E
rror
C
orrection – A process whereby data being transmitted over a
communications link can have error correction bits added which may be used at
the receiving end to determine/correct any transmission errors which may occur.
FIFO
F
irst
I
n
F
irst
O
ut – A simple buffer or queue technique whereby data queued
the longest is transmitted first.
FTP
F
ile
T
ransfer
P
rotocol – An application for transferring computer files over the
Internet. See also TFTP.
FXO
F
oreign e
X
change
O
ffice – a 2 wire telephone interface that looks like a line
originating from a telephone exchange. See also FXS.
FXS
F
oreign e
X
change
S
ubscriber – a 2 wire telephone interface that looks like a
line coming from a telephone instrument. See also FXO.
G
G.729
ITU standard for
LD-CELP
(
L
ow
D
elay –
C
ode
E
xcited
L
inear
P
rediction)
voice encoding at 8kb/s.
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