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shorter than a computer word. (A) (3) A string that
consists of a particular number of bits, usually 8, that is
treated as a unit, and that represents a character. (4) A
group of 8 adjacent binary digits that represent one
extended binary-coded decimal interchange code
(EBCDIC) character.
C
C. Celsius.
cable loss (optical). The loss in an optical cable
equals the attenuation coefficient for the cabled fiber
times the cable length.
CBR. Constant bit rate.
CCITT. Comité Consultatif International Télégraphique
et Téléphonique. The International Telegraph and
Telephone Consultative Committee.
Class A network. In Internet communications, a
network in which the high-order (most significant) bit of
the IP address is set to 0, and the host ID occupies the
three low-order bytes.
Class B network. In Internet communications, a
network in which the two high-order (most significant and
next-to-most significant) bits of the IP address are set to
1 and 0, respectively, and the host ID occupies the two
low-order bytes.
Class C network. In Internet communications, a
network in which the two high-order (most significant and
next-to-most significant) bits of the IP address are both
set to 1, and the next high-order bit is set to 0. The host
ID occupies the low-order byte.
CLP. Cell loss priority.
community. An administrative relationship between
Simple Network Management Protocol (SNMP) entities.
community name. An opaque string of bytes
identifying a community.
configuration. (1) The arrangement of a computer
system or network as defined by the nature, number,
and chief characteristics of its functional units. More
specifically, the term may refer to a hardware
configuration or a software configuration. (I) (A) (2) The
devices and programs that make up a system,
subsystem, or network.
connect. In a LAN, to physically join a cable from a
station to an access unit or network connection point.
Contrast with
attach.
connection. (1) In data communication, an association
established between functional units for conveying
information. (I) (A) (2) In Open Systems Interconnection
architecture, an association established by a given layer
between two or more entities of the next higher layer for
the purpose of data transfer. (T) (3) In SNA, the
network path that links two logical units (LUs) in different
nodes to enable them to establish communications.
(4) In X.25 communication, a virtual circuit between two
data terminal equipments (DTEs). A switched virtual
circuit (SVC) connection lasts for the duration of a call; a
permanent virtual circuit (PVC) is a permanent
connection between the DTEs. (5) In TCP/IP, the path
between two protocol applications that provides reliable
data stream delivery service. In Internet, a connection
extends from a TCP application on one system to a TCP
application on another system. (6) The path between
two protocol functions, usually located in different
machines, that provides reliable data delivery service.
(7) A logical association between a call participant
(party) and a switch. A party's connection represents
that party's participation in a telephone call.
CPE. Customer premises equipment.
customer-replaceable unit (CRU). An assembly or
part that a customer can replace in its entirety when any
of its components fail. Contrast with
field replaceable
unit (FRU).
D
daemon. A program that runs unattended to perform a
standard service. Some daemons are triggered
automatically to perform their task; others operate
periodically. Synonymous with demon.
data communication. (1) Transfer of information
between functional units by means of data transmission
according to a protocol. (T) (2) The transmission,
reception, and validation of data. (A)
data transfer rate. The average number of bits,
characters, or blocks per unit of time passing between
equipment in a data-transmission system. (I) The rate is
expressed in bits, characters, or blocks per second,
minute, or hour.
Glossary
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