AT&T 3.0 manual Cas, Cat, Ccs

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