1. Components of a PABX
Time division switch
The heart of the PABX system.
Uses a PCM data stream.
Line cards
Connection to the users.
Connection to extensions,
exchange lines, or tie lines.

2. Components of a PABX
Time division switch
Due to demand on CPU, multiple
processors dist. architecture are
used.
CPU
Controlls overall operation of
the PABX.
Power is maintained by a
backup battery.