Instruction manual

Glossary
conversion
resource
COR
CO trunk jack
CRC
CSU
cyclic
redundancy
check
D4 framing
format
data channel
data
communications
equipment
data hunt group
data rate
data terminal
data terminal
equipment
DCE
D-channel
DCP
See modem pool.
(Class of restriction) The 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 Automatic Callback queuing.
A jack that connects an outside trunk to the
communications system control unit.
(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.
A 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.
See DCE.
See DHG.
See bit rate.
An I/O device that can be connected to the
communications system control unit via an interface.
See DTE.
(Data communications equipment) Equipment such as
modems or data modules used to establish, maintain, and
terminate a connection between the communications
system and data terminal equipment, such as printers, host
computers, or workstations.
A 16-kbps or 64-kbps channel that carries signaling
information or data on a BRI or PRI.
(Digital Communications Protocol) An AT&T proprietary
protocol to transmit both digitized voice and data over the
same communications link. A DCP link is made up of two
64-kbps information (I) channels and one signaling (S)
channel to the B- and D-channels used in an ISDN.
Glossary GL-7