AT&T MERLIN LEGEND Release 3.1 Maintenance And Troubleshooting Manual page 394

Glossary
control unit
console
CONVERSANT
conversion resource See modem pool .
COR
Coverage
CRC
CSU
cyclic redundancy
check
D
D4 framing format
Data-channel
Processor module , power supply modules , line/trunk and
extension modules , carriers , and housing of the system.
Refers to telephone and adjuncts (if any) at an operator or
system programmer extension.
Voice response application that automatically answers and
routes calls and executes telephone transactions.
(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 ( FRLs ), Allowed Lists,
Disallowed Lists, and pool dial out restrictions.
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 .
Framing format consisting of a sequence of individual
frames of 24 eight- bit slots and one signal bit (193 bits) in
a 12-frame superframe. See also ESF .
See D-channel .
Maintenance and Troubleshooting
GL–9