Lucent Technologies 555-661-150 manual Dlc, Dnis, Dos, DS0, DS1

MERLIN LEGEND Communications System Release 6.1		Issue 1
Network Reference 555-661-150	August 1998
Glossary
	Page GL-10
Digital Signal 1	See DS1.
digital subscriber	See DSL.
line
digital switch	See DSE.
element
digital	Mode of transmission in which the information to be
transmission	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	(DFT) See personal line.
termination
Direct Inward Dial	See DID.
Direct-Line	See DLC.
Console
Direct Station	See DSS.
Selector
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	Device connected to a basic telephone jack and used at an
unit	unattended extension or front desk.
DOS	(disk operating system)
drop-and-insert	A device that can be installed between systems connected
equipment	by tandem PRI trunks or T1-emulatedtandem tie trunks to
	allow fractional use of the facility, that is, use of fewer than
	23 of the PRI B-channelsor 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.