MERLIN LEGEND Communications System Release 7.0
System Programming
555-670-111
Issue 1
April 1999
Glossary
GL-12
E
DSL
Digital Subscriber Line
. 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.
E&M Signaling
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
.
EIA
Electronic Industries Association
.
EIA-232-D
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 meters).
Electronic
Switching System
See
.
Endpoint
Final destination in the path of an electrical or
telecommunications signal.
Enhanced Service
Center
Application that sends calls to available agents in a calling
group. The Enhanced Service Center places calls in queue,
plays announcements, tracks agent activity and availability,
and provides real-time reports.
ESF
Extended Superframe Format
.
PRI
framing format
consisting of individual frames of 24 eight-bit slots and one
signal bit (193 bits) in a 24-frame extended superframe.
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.
ETR Telephone
Enhanced tip/ring telephones (Series 4) supported in
MERLIN LEGEND Release 7.0 and later.
