AT&T System 25 User Manual
Page 428
GLOSSARY
Switch
The software-controlled communications processor complex that
interprets dialing pulses/tones/keyboard characters and makes the
proper interconnections both within the system and outside the
system. The switch itself consists of a digital computer, software,
storage device (memory), and associated circuit packs
hardware necessary to perform the actual connections.
Switchhook
and special
The button(s) on a voice terminal located under the receiver. A user
typically goes “off-hook” to place or answer a call by picking up the
receiver and goes “on-hook” (hangs up) to end a call.
The RS-232C DTE peripheral equipment used to enter and change
system translations.
Synchronization
System
System
Coordinated timing whereby all switches,
multiplexer operate from the same stable
process assures that the transmit and the
achieve proper bit alignment.
Administrator
channel banks, and
clock reference. The
distant receive node
A person responsible for specifying and administering features and
services for the system.
R e s t o r e
A process that allows stored data to be written from a tape into the
system memory (normally after a cold start).
T 1
The T1 carrier system is a high speed, time division multiplexed,
digital transmission facility capable of transmitting voice and data at
1.544 Mbps. In System 25, T1 can replace up to 24 analog trunks,
offering improved quality, cost savings, and enhanced features.
G-15