Lucent Technologies 6.1 manual Ccitt, Ccs

MERLIN LEGENDCommunications System Release 6.1		Issue 1
System Planning 555-661-112	August 1998
Glossary
	Page GL-6
CCITT	(International Telegraph and Telephone Consultative
	Committee)
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.
Centralized Voice	The sharing of a voice messaging system by two or more
Messaging	directly connected MERLIN LEGEND systems in a private
	network. Available beginning in Release 6.1.
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	See CSU.
unit
checksum	Sum of ones in a sequence of ones and zeros used to
	detect or correct errors in data transmission.
circuit-switched	Data call made through an exclusively established and
data call	maintained connection between data stations.
class of restriction	See COR.
clear data channel	Clear data channels (also called unrestricted data
	channels) allow the transmission of occurrences of more
	than seven contiguous zero bits. If a clear data channel is
	requested and only restricted channels are available, the
	call will be rejected. See also restricted data channel.