Clear-Com AB-120 - Manual (Page 17)

Clear-Com Communication Systems
AB-120 Announcer Console Instruction Manual
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APPLICATION OF VARIOUS INTERCOM SYSTEM
TYPES
The AB-120 is intended to work with virtually any intercom system.
Options, jumpers, and connectors have been provided for the following
systems.
• Clear-Com party-line
• TW party-line Systems (RTS)
• Other four wire systems
Clear-Com Party-Line
An all Clear-Com party-line system is described as follows:
IFB
IFB is provided by a PIC-4000 two channel IFB system containing
interrupt and non-interrupt functionalities.
INTERCOM
Talkback is provided from one channel of a Clear-Com party-line
system. This single channel is the producer channel. Any announcer
pressing the talkback button would speak into this channel. Any or all
of the announcers may talk at any time as they are summed on the
party-line channel.
Power
Power for the AB-120 is derived from the intercom line, an external DC
supply or optionally from the IFB line.
Figure 1-7: AB-120 Connected to a Clear-Com Party-Line System