AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 355

Glossary
codec
common channel
signaling
communications
system
control unit
console
CONVERSANT
conversion
resource
COR
Coverage
CRC
CSU
cyclic redundancy
check
(coder-decoder) 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 .
Software-controlled processor complex that interprets
dialing pulses, tones, and or keyboard characters and
makes the proper interconnections both inside and
outside. Consists of a computer, software, a storage
device, and carriers with special hardware to perform the
actual connections. Provides voice and/or data
communications services, including access to public and
private networks, for telephones and other equipment.
Also referred to in this guide as "system," short for
MERLIN LEGEND Communications System.
Processor module , power supply modules , line/trunk and
extension modules , carrier s, and housing of the system.
Refers to telephone and adjuncts (if any) at operator or
system programmer extension.
Entry-level voice response application that automatically
answers and routes calls and executes telephone
transactions.
See modem pool .
(class of restriction) Various types of restrictions that can
be assigned to remote access trunks or barrier codes.
These restrictions consist of calling restrictions, ARS
Facility Restriction Levels ( FRL s), Allowed Lists,
Disallowed Lists, and Automatic Callback queuing.
Set of system features that can determine how extensions'
calls are covered when the person at the extension is busy
or not available.
(cyclic redundancy check) An error-detection code used
on DS1 facilities with the extended superframe format
( ESF ).
(channel service unit) Equipment used on customer
premises to provide DS1 facility terminations and signaling
compatibility.
See CRC .
GL–7
System Planning