Monroe Electronics 988 - Manual (Page 14)

14
Installation
Connect the telephone cable to the RJ-11 plug, two wires for balanced audio from
the screw terminals marked AFSK/AUDIO to the balanced input of the
encoder/decoder audio input, and the power supply wires to the + and – screw
terminals marked for power. The white wire is the + wire.
If your audio input is unbalanced, connect a wire to the AFSK/AUDIO terminal
nearest to the power terminals, and connect this wire to the audio input on your
encoder/decoder. Then connect a wire from the terminal marked GND nearest to
the power terminals, and connect this to the ground on your encoder/decoder.
Plug in the power supply.
Make sure that your encoder/decoder has been set to accept an audio input from
the terminals you have wired it to, and is configured to accept signals from this
input as if they were from a separate radio receiver.
Note: During setup, you may want to disable the output from the encoder/decoder
so that no alarms are displayed through the cable system.