AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 267

Glossary
channel
Channel
Service Unit
circuit-switched
data call
clock
synchronization
CMS
CO
codec
common-
channel
signaling
communications
system
control unit
conversion
resource
CRC
CSU
A telecommunications transmission path for voice and/or
data.
See CSU.
A data call made via a connection exclusively established
and maintained between data stations for the duration of
the data call.
The operation of digital facilities from a common clock.
(Call Management System) A DOS-based application that
simulates the actions of a system operator by answering
and distributing calls. CMS also produces management
reports for call analysis.
(Central office) The location of telephone switching
equipment that provides local telephone service and
access to toll facilities for long distance calling.
(Coder-decoder) A device used to convert analog signals
such as speech, music, or television to digital form for
transmission over a digital medium and back to the original
analog form.
See CCS.
The software–controlled processor complex that interprets
dialing pulses, tones, and/or keyboard characters and
makes the proper interconnections both inside and outside
the system. The communications system itself consists of a
digital computer, software, a storage device, and carriers
with special hardware to perform the actual connections. A
communications system provides voice and/or data
communications services, including access to public and
private networks, for telephones and data terminals on a
customer's premises.
The housing, carriers, power supply, processor, and
modules of a communications system.
See modem pool.
(Cyclic redundancy check) An error-detection code used
on DS1 facilities with the ESF format.
(Channel Service Unit) Equipment used at a customer's
premises to provide DS1 facility terminations and signaling
compatibility.
Glossary GL-5