Specifications

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15. TALK BACK Switch Bank - Determines if a 70V speaker zone will operate as a two-way hands-free talk back
zone or as a one-way paging zone (see Section 8.3).
16. TALK BACK DELAY - Controls the amount of delay, after speaking stops, before the system switches to the
listen mode during talk back operation (see Section 8.3).
17. TALK BACK VOLUME - Controls the audio level of the talk back signal (see Section 8.3).
18. NOISE REDUCTION - Enables or disables noise reduction during talk back listening. Mutes listen signal when
audio activity is low (see Section 8.3).
19. DATA LINK - Data com port used to control other module assemblies in the PCM paging system. Uses simple
RCA cables to interconnect units. (see LUPCMADD manual)
20. SYS ID - Switch bank used to set unique address of the PCMCPU module when other LUPCMADD assemblies
are used in the paging system.
21. RUN/PROGRAM Switch - Switch must be set to the PROGRAM position before any system programming can
be done. Return to RUN position for normal system operation. Locking plate ensures that switch will not be
accidentally set to program mode. Switch only needs to be changed on the LUPCMALL main assembly.
LUPCMADD assemblies always stay in RUN mode (see Section 8.1).
22. 12V DC Power Jack - PCM system power supply connects to this jack.