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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Glossary
Page GL-10
Dialed Number
Identification
Service
See
DNIS
.
dial-out code Digit (usually a ) 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
.
Digital Signal 1 See
DS1
.
digital subscriber
line
See
DSL
.
digital switch
element
See
DSE
.
digital
transmission
Mode of transmission in which the information to be
transmitted is first converted to digital form and then
transmitted as a serial stream of pulses. See also
analog
transmission
.
DIP switch (dual in-line package) Switch on a 400EM module used to
select the signaling format for tie-line transmission. Also
used on other equipment for setting hardware options.
direct facility
termination
(DFT) See
personal line
.
Direct Inward Dial See
DID.
Direct-Line
Console
See
DLC
.
Direct Station
Selector
See
DSS
.