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Glossary
campus cable
Cable that runs between buildings connected to the same
communications system.
CAS
(Call Accounting System) DOS- or UNIX System-based
application that monitors and manages
telecommunications costs.
CAT
(Call Accounting Terminal) Stand-alone unit with a built-in
microprocessor and data buffer that provides simple call
accounting at a low cost.
CCS
(common-channel signaling) Signaling in which one
channel of a group of channels carries signaling
information for each of the remaining channels, permitting
each of the remaining channels to be used to nearly full
capacity. In the system’s 100D module, channel 24 can be
designated as the signaling channel for channels 1-23.
centralized
Programming of features on individual telephones;
telephone
performed at a central location by the system manager.
programming
See also system programming and extension
programming.
central office
See CO.
Centrex
Set of system features to which a user can subscribe on
telephone lines/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
Data call made through an exclusively established and
call
maintained connection between data stations.
class of restriction
See COR.
Maintenance and Troubleshooting GL-7