Lucent Technologies MERLIN LEGEND Release 6.1 System Manager's Manual page 438

MERLIN LEGEND Communications System Release 6.1
System Manager's Guide 555-661-118
Glossary
door answering
unit
DOS
drop-and-insert
equipment
DS0
DS1
DSL
DSS
DTE
DTMF signaling
E
E&M signaling
EIA
EIA-232-D
Electronic
Switching System
endpoint
Device connected to a basic telephone jack and used at an
unattended extension or front desk.
(disk operating system)
A device that can be installed between systems connected
by tandem PRI trunks or T1-emulated tandem tie trunks to
allow fractional use of the facility, that is, use of fewer than
23 of the PRI B-channels or 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.
(Digital Signal 0) Single 64-kbps voice or data channel.
(Digital Signal 1) Bit -oriented signaling interface that
multiplexes twenty-four 64-kbps channels into a single
1.544-Mbps stream.
(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.
(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 two-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 EIA , that transmits and
receives asynchronous data at speeds of up to 19.2-kbps
over cable distances of 50 feet (15 m).
See ESS .
Final destination in the path of an electrical or
telecommunications signal.
Issue 1
August 1998
Page GL-11