Glossary

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 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

SA buttons

(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.

SDN

(Software Defined Network) AT&T private networking

 

service created by specialized software within the public

 

network.

SID

(station identification)

GL–28Maintenance and Troubleshooting

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AT&T 3.0 manual Rom, Saa, Sdn, Sid