AT&T MERLIN LEGEND Communications System Key System Planning Forms Errata Instruction Manual Page 364

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MERLIN LEGEND Communications System Release 5.0
System Planning
555-650-112
Issue 1
June 1997
Glossary
Page GL--6
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.
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 Signal 0 See
DS0
.
Digital Signal 1 See
DS1
.
digital subscriber
line
See
DSL
.
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
.
direct facility
termination
(DFT) See
personal line
.
Direct Inward Dial 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.
DLC (Direct-Line Console) Telephone used by a system
operator to answer outside calls (not directed to an
individual or a group) and inside calls, transfer calls, make
outside calls for users with outward calling restrictions, set
up conference calls, and monitor system operation.
DNIS (Dialed Number Identification Service) Service provided by
AT&T and MCI; it routes incoming 800 or 900 calls
according to customer-selected parameters, such as area
code, state, or time of call.
door answering
unit
Device connected to a basic telephone jack and used at an
unattended extension or front desk.
DOS (disk operating system)
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