AT&T MERLIN LEGEND Release 3.0 System Programming And Maintenance Manual page 97

Glossary
CAT
CCITT
CCS
centralized telephone
programming
central office
Centrex
channel
channel service unit
checksum
circuit-switched data
call
restriction
class of
(Call Accounting Terminal) Standalone unit with
a built-in microprocessor and data buffer that
provides simple call accounting at a low cost.
(International Telegraph and Telephone
Consultative Committee)
(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.
Programming of features on individual
telephones; performed at a central location by
the system manager. See also system
programming and extension programming.
See CO.
Set of system features to which a user can
subscribe on telephone trunks from the local
telephone company.
Telecommunications transmission path for
voice and/or data.
See CSU.
Sum of ones in a sequence of ones and zeros
used to detect or correct errors in data
transmission.
Data call made through an exclusively
established and maintained connection
between data stations.
See COR.
System Programming and Maintenance (SPM) GL-7