Lucent Technologies MERLIN LEGEND 6 System Manager's Manual page 434

MERLIN LEGEND Communications System Release 6.0
System Manager's Guide 555-660-118
Glossary
Digital Signal 1
digital subscriber
line
digital switch
element
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
See DS1 .
See DSL .
See DSE .
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 .
(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 .
See DSS .
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, transfer calls, make
outside calls for users with outward calling restrictions, set
up conference calls, and monitor system operation.
(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.
Device connected to a basic telephone jack and used at an
unattended extension or front desk.
(disk operating system)
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.
(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
February 1998
Page GL-10