AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 359

Glossary
E
E&M signaling
EIA
EIA-232-D
Electronic
Switching System
endpoint
ESF
ESS
expansion carrier
ExpressRoute 1000
extension
extension jack
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.
(extended superframe format) Framing format consisting
of individual frames of 24 eight- bit slots and one signal bit
(193 bits) in a 24-frame extended superframe. See also D4
framing format.
(Electronic Switching System) Class of central office ( CO )
switching systems developed by AT&T in which the control
functions are performed principally by electronic data
processors operating under the direction of a stored
program.
Carrier added to the control unit when the basic carrier
cannot house all of the required modules. Houses a power
supply and up to six additional modules.
Data communications device that allows connection
between an RS-232 DTE device and the control unit using
MLX extension jacks on the 008 MLX or 408 GS/LS-MLX
module.
An endpoint on the internal side of the communications
system. An extension can be a telephone with or without
an adjunct. See also data station.
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.
GL–11
System Planning