AT&T MERLIN LEGEND Release 3.1, System Programming Manual

Page: 856 / 887

Glossary
System Programming
GL–9
dial plan Numbering scheme for system extensions, lines, and
trunks.
dial-repeating tie
trunk See delay-dial start tie trunk .
DID (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.
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 Signal 0 See DS0 .
Digital Signal 1 See DS1 .
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
Dialing See DID.
Direct-Line Console See DLC .
Direct Station
Selector See DSS .
display buttons Buttons on an MLX display telephone used to access the
telephone’s display.