AT&T MERLIN LEGEND Release 3.1, Руководство по системному программированию

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Glossary
GL–6
System Programming
central office See CO .
Centrex Set of system features to which a user can subscribe on
telephone trunks from the local telephone company.
channel Telecommunications transmission path for voice and/or
data.
channel service unit See CSU .
checksum Sum of ones in a sequence of ones and zeros used to
detect or correct errors in data transmission.
circuit-switched
data call Data call made through an exclusively established and
maintained connection between
data stations .
class of restriction See COR .
clock
synchronization Operation of digital facilities from a common clock.
CMS (Call Management System) DOS-based application that
simulates the actions of a system operator by answering
and distributing calls. Also produces reports for call
analysis.
CO (central office) Location of telephone switching equipment
that provides local telephone service and access to toll
facilities for long-distance calling.
coaxial cable Cable consisting of one conductor, usually a small copper
tube or wire within and insulated from another conductor of
larger diameter, usually copper tubing or copper braid.
codec (coder-decoder) Device used to convert analog signals
such as speech, music, or television to digital form for
transmission over a digital medium and back to the original
analog form.
common channel
signaling See CCS .
communications
system Software-controlled processor complex that interprets
dialing pulses, tones, and or keyboard characters and
makes the proper interconnections both inside and
outside. Consists of a computer, software, a storage
device, and
carriers with special hardware to perform the
actual connections. Provides voice and/or data
communications services, including access to public and
private networks, for telephones and other equipment. Also
referred to in this guide as “system,” short for MERLIN
LEGEND Communications System.