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Glossary
DS1
DSS
DTE
DTMF signaling
E
E&M signaling
EIA
EIA-232-D
Electronic Switching
System
endpoint
(Digital Signal Level 1) Bit -oriented signaling interface that
multiplexes twenty-four 64-kbps channels into a single
1.544-Mbps stream.
(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.
(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.
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.
(Electronic Industries Association)
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.)
See ESS.
Final destination in the path of an electrical or
telecommunications signal.
Maintenance and Troubleshooting GL–13