Instruction manual

MERLIN LEGEND Communications System Release 5.0
System Planning
555-650-112
Issue 1
June 1997
Glossary
Page GL--7
E
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.
EIA (Electronic Industries Association)
Electronic
Switching System
See ESS .
endpoint Final destination in the path of an electrical or
telecommunications signal.
ESS (Electronic Switching System) Class of central office ( CO )
switching systems developed by Lucent Technologies in
which the control functions are performed principally by
electronic data processors operating under the direction of
a stored program.
expansion carrier Carrier added to the control unit when the basic carrier
cannot house all of the required
modules. Houses a power
supply module and up to six additional modules.
extension An endpoint on the internal side of the communications
system. An extension can be a telephone with or without an
adjunct. Also called “station.” See also
data workstation.
extension jack An analog, digital, or tip/ring physical interface on a module
in the control unit for connecting a telephone or other
device to the system. Also called “station jack.”
extension
programming
Programming performed at an extension to customize
telephones for personal needs; users can program features
on buttons, set the telephone ringing pattern, and so on.
See also
centralized telephone programming and system
programming
.