Instruction manual

MERLIN LEGEND Communications System Release 5.0
Maintenance and Troubleshooting
555-650-140
Issue 1
June 1997
Glossary
Page GL-9
CCS (common-channel signaling) Signaling in which one
channel of a group of channels carries signaling
information for each of the remaining channels, per-
mitting 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
telephone
programming
Programming of features on individual telephones;
performed at a central location by the system
manager.
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 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.