Noise Reduction Module Model A125 Installation Instructions Description The 3M A125 Noise Reduction board (3M part number 78-9236-6453- 2) improves the inbound intelligibility of an intercom system by reducing environm ental backgrou nd noise from vehicles, airplanes, noisy intersections, wind, etc.

2 ***Important installation notice*** Starting with serial number 125002477, the A125 Noise Reduction Module, Internal has a wider ribbon cable plug. A limited number of these Noise Reduction Modules have two indivi dual ribbon cable plugs. The wider ribbon cable plug(s) are too wide to fit into the blue 20-pi n base station receptacle.

3 System Configuration The A125 Noise Reduction board is configured by two jum per switches, (JMP1 and JMP2), shown in Table 1. Jumper Position Position A Position B JMP1 * Separate microphone & s.

4 Status Indication The condition of the red LED on the 3M C960 base station indi cates the current status of the unit. The LED can be off, blink at defined intervals, or be constantly lit.