AT&T MERLIN LEGEND Release 3.1, System Programming Manual

Page: 869 / 887

Glossary
GL–22
System Programming
R
RAM
(random-access memory) Computer memory in which an
individual
byte
or range of bytes can be addressed and
read or changed without affecting other parts of memory.
read-only memory
See
ROM
.
Remote Access
System feature that allows an outside caller to gain access
to the system, almost as if at a system extension.
restore
Procedure whereby saved and archived system
programming is reinstated on the system, from a floppy
disk or
memory card
. See also
backup
.
ring generator
Circuit pack added to the power supply that generates a
high-voltage, 20–30 Hz signal to ring a telephone.
riser cable
Cable that runs between floors in a multistory building and
connects wiring closets.
RS-232
Physical interface, specified by the Electronics Industries
Association (
EIA
), that transmits and receives
asynchronous
data at distances of up to 50 feet (15 m).
robbed-bit signaling
Signaling in which the least significant
bit
of every sixth
frame per channel is used for signaling in that channel.
ROM
(read-only memory) Computer memory that can be read
but cannot be changed.
S
SAA (Supplemental Alert Adapter) Device that permits -48-VDC
alerting equipment to be connected to an analog multiline
telephone jack so that people working in noisy or remote
areas of a building can be alerted to incoming calls.
SA buttons Telephone buttons that provide a single interface to users
for both internal and external calling.
SDN (Software Defined Network) AT&T private networking
service created by specialized software within the public
network.