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MERLIN LEGEND Communications System Release 6.1
Network Reference
555-661-150
Issue 1
August 1998
Glossary
Page GL-10
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
.
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)
drop-and-insert
equipment
A device that can be installed between systems connected
by
tandem PRI trunks
or T1-emulated
tandem tie trunks
to
allow fractional use of the facility, that is, use of fewer than
23 of the PRI
B-channels
or fewer than 24 of the T1
channels
. In a PRI facility, the equipment must never drop
Channel 24, the
D-channel
. All channels must still be
programmed and all count towards the system maximum of
80 lines.
DS0 (Digital Signal 0) Single 64-kbps voice or data channel.
DS1 (Digital Signal 1)
Bit
-oriented signaling interface that
multiplexes twenty-four 64-kbps channels into a single
1.544-Mbps stream.