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ATM cell is an information packet
containing 53 bytes of data traffic and additional ''overhead"
defining the virtual circuits and paths over which the data are to
Bandwidth is the part of a
frequency band occupied by a communications channel. Sometimes the
term is used to describe the number of bits per second transmitted
in a channel.
Bent pipe is a satellite
communications system that transmits to an Earth station
essentially the same signal it receives from another Earth
BER (bit-error rate) is the
probability that a bit is received in error.
Bit is a binary unit of
bps (bits per second) refers to the
speed at which data is generated by a source or transmitted over a
communications channel. Measurements are often stated in units of
103 bits per second (kilobits or
kbps) or 106 bits per second
(megabits or Mbps).
Byte is a unit of 8 bits.
C4I (command, control, communications,
computing, intelligence) is a military concept encompassing all the
functions and capabilities sought in an advanced communications
CDMA (code division multiple
access) is a technique that allows many users to share the same
radio spectrum. A sequence of pseudo-random bits, known as a code,
spreads the information signal over a much larger range of
frequencies than is occupied by the original information signal.
See FDMA, TDMA, spread spectrum.
CDPD (cellular digital packet data)
is a packet-switched network that uses one or more channels in an
analog cellular telephone system.
Cell refers to a geographic region
within which cellular telephone subscribers can communicate with a
particular base station (site). Cell radius ranges from 0.5-15
kilometers depending on the density of the subscribers and the
extent of topological obstructions.
CELP (code excited linear
prediction) is a technique for encoding voice.
CMOS (complementary metal oxide
semiconductor) is an inexpensive, low-power integrated circuit
CONDOR is a National Security
Agency program designed to develop and demonstrate secure voice and
secure net broadcast services, using STU III-compatible units, over
the commercial cellular infrastructure.
COTS (commercial off-the-shelf)
refers to readily available commercial technologies and
CSMA/CD (carrier-sense multiple
access with collision detection) is a