AT&T 7300 series, 7500 series, 7100 series, 2500 series manual Dcs Dmi-Bos, Dmi-Mos, Dmi/Mos, DS1

GLOSSARY GL-11

_______________________________________________________________________________________
_
direct outward dialing	A feature that enables a communications-system telephone user to gain
(DOD)	access to the public network without the assistance of an attendant by
	dialing an access code and receiving a second dial tone. The user can then
	dial the desired public-network number.
distributed	An ETN and/or M/ST network linked in such a way that selected features
communications system	appear to operate as if the network were one system.
(DCS)
DMI-BOS	See digital multiplexed interface with bit-oriented signaling.
DMI-MOS	See digital multiplexed interface with message-oriented signaling.
DMI with message-	Digital-multiplexed-interface (DMI) signaling in which the signaling in
oriented signaling	the 24th channel is based on the definitions of strings of bits that form
(DMI/MOS)	messages. DMI/MOS is similar to the Integrated Services Digital
	Network primary rate interface (ISDN-PRI). Also called message-
	oriented signaling.
DS1	See digital signal level 1.
DS1 robbed-bit signaling	See robbed-bit signaling.
duplex data link	Electronic equipment that permits automatic transmission of digital
	information between two points, in both directions simultaneously. See
	also simplex data link.
EIA interface	A standardized set of signal characteristics (time, duration, etc.) specified
	by the EIA. Normally means a RS-232C interface.
EIA port	A communications systems port circuit with a built-in data module which,
	when used a Z3A ADU at the data terminal equipment (DTE) end of the
	connection, extends the RS-232C serial interface to asynchronous DTE
	over two pairs of standard voice grade wire without need for an
	intervening modem or data module. Also referred to as a Data Line
	Circuit.
electronic tandem	A private network that consists of private and public trunking and
network (ETN)	switching resources. ETNs often span geographic areas and consist of
	private or leased transmission facilities that interconnect the customer’s
	communications systems. An ETN uses Automatic Alternate Routing
	(AAR) with a uniform numbering plan to address the various
	communications systems and telephones in the ETN.
emulation	A technique using software programming that allows one computer or
	digital device to behave like another device.