AT&T 3.0 manual Dss Dte, Eia

Glossary

DS1(Digital Signal Level 1) Bit -oriented signaling interface that multiplexes twenty-four 64-kbps channels into a single 1.544-Mbps stream.

DSS

DTE

(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.

(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.

E

E&M signaling	Trunk supervisory signaling, used between two
	communications systems, in which signaling information is
	transferred through 2-state voltage conditions (on the Ear
	and Mouth leads) for analog applications and through two
	bits for digital applications, See also tie trunk.
EIA	(Electronic Industries Association)
EIA-232-D	Physical interface, specified by the HA, that transmits and
	receives asynchronous data at speeds of up to 19.2-kbps
	over cable distances of 50 ft. (15 m.)
Electronic Switching	See ESS.
System
endpoint	Final destination in the path of an electrical or
	telecommunications signal.

Maintenance and Troubleshooting GL–13