Lucent Technologies 6.1 manual Dlc, Dnis, Dos, DS0, DS1, Dsl, Dss, Dte

MERLIN LEGENDCommunications System Release 6.1		Issue 1
System Planning 555-661-112	August 1998
Glossary
	Page GL-11
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.
DSL	(Digital Subscriber Line) A Digital Subscriber Line provides
	full-duplex service on a single twisted metallic pair (2-wire)
	at a rate sufficient to support ISDN Basic Rate Access.
DSS	(Direct Station Selector) 60-button adjunct that enhances
	the call-handling capabilities of an MLX-20L or MLX-28D
	telephone used as an operator console.
DTE	(data terminal equipment) Equipment that makes the
	endpoints in a connection over a data connection; for
	example, a data terminal, personal computer, host
	computer, or printer.
DTMF signaling	(dual-tone multifrequency signaling) Touch-tone signaling
	from telephones using the voice transmission path. DTMF
	signaling provides 12 distinct signals, each representing a
	dialed digit or character, and each composed of two
	voiceband frequencies.