Lucent Technologies 555-661-150 manual Cms

MERLIN LEGEND Communications System Release 6.1		Issue 1
Network Reference 555-661-150	August 1998
Glossary
	Page GL-6
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 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.
clock	When digital signals are transmitted over a
synchronization	communications link, the receiving end must be
	synchronized with the transmitting end to receive the digital
	signals without errors using clock synchronization. A
	system synchronizes itself by extracting a timing signal
	from an incoming digital stream. All the digital facilities in a
	network operate from a single common clock, preferably a
	port connected to a digital PSTN facility on a hub system or
	a system that connects two network systems. In this case,
	all digital facilities specify a loop clock source. One system
	in a network may be specified as a local clock source when
	no functioning digital facility in the network is connected to
	the PSTN. All other digital facilities then use this clock and
	specify their clock sources as loop. Primary, secondary,
	and tertiary clock sources are specified to allow backup
	synchronization in the event that the primary source is out
	of service.
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.