Lucent Technologies MERLIN LEGEND Release 7.0 Feature Reference page 1011

MERLIN LEGEND Communications System Release 7.0
Feature Reference 555-670-110
Glossary
Digital Subscriber
Line
Digital
Transmission
DIP Switch
Direct Facility
Termination
Direct Inward Dial
Direct-Line
Console
Direct Station
Selector
Display Buttons
DLC
DNIS
Door Answering
Unit
DOS
Drop-and-Insert
Equipment
DS0
DS1
DSL
See .
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
Transmission .
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.
DFT . See Personal Line
See DID.
See DLC .
DSS
See .
Buttons on an MLX display telephone used to access the
telephone's display.
Direct-Line Console . Telephone used by a system operator
to answer outside calls (not directed to an individual or a
group) and inside calls, to transfer calls, to make outside
calls for users with outward calling restrictions, to set up
conference calls, and to monitor system operation.
Dialed Number Identification Service . Service provided by
AT&T and MCI to route incoming 800 or 900 calls
according to customer-selected parameters, such as area
code, state, or time of call.
Device connected to a tip/ring jack and used at an
unattended extension or front desk.
Disk Operating System .
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.
Digital Signal 0 . Single 64-kbps voice or data channel.
Digital Signal 1 . Bit -oriented signaling interface that
multiplexes twenty-four 64-kbps channels into a single
1.544-mbps stream.
.
Issue 1
April 1999
GL-11
Analog