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Glossary
Remote Access
restore
ring generator
riser cable
RS-232
robbed-bit signaling
ROM
S
SAA
SA buttons
SDN
SID
System feature that allows an outside caller to gain access
to the system, almost as if at a system extension.
Procedure whereby saved and archived system
programming is reinstated on the system, from a floppy
disk or memory card. See also backup.
Circuit pack added to the power supply that generates a
high-voltage, 20–30 Hz signal to ring a telephone.
Cable that runs between floors in a multistory building and
connects wiring closets.
Physical interface, specified by the Electronics Industries
Association (EIA), that transmits and receives
asynchronous data at distances of up to 50 feet (15 m).
Signaling in which the least significant bit every sixth
frame per channel is used for signaling in that channel.
(read-only memory) Computer memory that can be read
but cannot be changed.
(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.
Telephone buttons that provide a single interface to users
for both inside and outside calling.
(Software Defined Network) AT&T private networking
service created by specialized software within the public
network.
(station identification)
GL–28 Maintenance and Troubleshooting