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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Glossary
Page GL-9
D-channel (Data-channel) 16- or 64-kbps channel that carries
signaling information or data on a
PRI
or
BRI
.
dedicated feature
buttons
The imprinted feature buttons on a telephone: Conf or
Conference, Drop, Feature, HFAI (Hands Free Answer on
Intercom), Hold, Message, Mute or Microphone, Recall,
Speakerphone or Spkrphone, and Transfer.
delay-start tie
trunk
Tie trunk
or
tandem 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 “dial-
repeating tie trunk.”
desktop
videoconferencing
system
A system application that allows face-to-face,
simultaneous video and voice communications between
individuals and requires high-speed
data transmission
facilities. See also
group videoconferencing system.
DFT (direct facility termination) See
personal line
.
DHG (data hunt group) Group of analog or digital
data stations
that share a common access code. Calls are connected in
a round-robin fashion to the first available data station in
the group.
dial access See
feature code
.
Dialed Number
Identification
Service
See
DNIS
.
dial-out code Digit (usually a 9) or digits dialed by telephone users to get
an outside line.
dial plan Numbering scheme for system extensions, lines, and
trunks.
dial-repeating tie
trunk
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 “dial-repeating tie trunk.”
DID (Direct Inward Dial) Service that transmits from the
telephone company central office and routes incoming calls
directly to the called extension,
calling group
, or outgoing
line/trunk
pool
, bypassing the system operator.
DID trunk 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.
digital Representation of information in discrete elements such as
off and on or zero and one. See also
analog transmission
.
Digital
Communications
Protocol
See
DCP
.
digital data station See
ISDN terminal adapter data station.
Digital Signal 0 See
DS0
.