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Glossary
Dialed Number
See DNIS.
identification Service
dial-out code
dial plan
dial-repeating tie
trunk
DID
DID trunk
digital
Digital
Communications
Protocol
Digit (usually a
9)
or digits dialed by telephone users to
get an outside line.
Numbering scheme for system extensions, lines, and
trunks.
Tie trunk on which the originating end of the tie trunk
transmits an off-hook signal to the receiving end and waits
for the receiving end to send an off-hook signal followed
by an on-hook signal. Also called “delay dial start tie
trunk.”
(Direct Inward Dialing) Service that transmits from the
telephone company central office and routes incoming
calls directly to the called extension, calling group, or
outgoing trunk pool, bypassing the system operator.
Incoming trunk that receives dialed digits from the local
exchange, allowing the system to connect directly to an
extension without assistance from the system operator.
Representation of information in discrete elements such as
off and on or zero and one. See also analog transmission.
See DCP.
digital data station
See 7500B data station.
Digital Signal 0
See DS0.
Digital Signal 1
See DS1.
digital switch
See DSE.
element
Maintenance and Troubleshooting GL–11