6
APPLICATIONS
Commercial / Industrial Paging System
This application shows a TMA120 being used in a commercial/industrial paging system. Channel #1 is set for
input from the telephone paging line, and is assigned both as a priority channel and manual muting of -20dB.
Channel #2 is set for input from the security paging microphone, which also has a push-to-talk switch wired to
the Mute/Chime terminals of the TMA120. Channel #3 is set for input from the line-level background music
source, and is assigned manual and auto muting of -20dB. Therefore, telephone paging will automatically
mute only the background music, whereas, security paging will manually mute both the background music and
the telephone paging. The TMA120 is set for 'xfmr' output and is connected to a 70V/100V distributed
speaker system.
WARNING: THE ABOVE DIAGRAM SHOWS THE OUTPUT TERMINAL COVER REMOVED FOR CLARITY ONLY. THE COVER
MUST BE INSTALLED WHEN THE UNIT IS ENERGIZED.
