AT&T Network Adapter 25 Installation And Maintenance Manual page 416

B u f f e r
A circuit or component that isolates one electrical circuit from
another. Typically, a buffer holds data from one circuit or process
until another circuit or process is ready to accept the data.
B u s
A multiconductor electrical path used to transfer information over a
common connection from any of several sources to any of several
destinations.
Bus, Time-Division Multiplex
See Time-Division Multiplex Bus.
Call Appearance
A button on a multiline voice terminal at which a call seems to
appear. Calls may be received, originated, and held at an
appearance. System Access, Personal Lines, Direct Extension
Selection, and Pooled Facilities are examples of call appearances.
Software makes it seem to the terminal user that a line actually is
terminated at the button.
Call Appearance, Voice Terminal
A button labeled with an extension number or line number used to
place outgoing calls, receive incoming calls, or hold calls. Two
light-emitting diodes (LEDs) next to the button show the status of the
call appearance or status of the call.
CCS (Hundred Call Seconds)
A traffic-measuring unit
traffic-handling devices
interruption represents a
Erlang).
Central Office
The location housing telephone switching equipment that provides
local telephone service and access to toll facilities for long-distance
c a l l i n g .
expresses the load of one or more
t h a t
A device used for 1 hour without
load of 36 CCS, which equals 1 erlang (see
GLOSSARY
G-3