The PC1001-A3 and PC1002-A3 Cerberus PACE Compact digital audio matrix boards both provide 1 connector ('Mic-S') with 2 switch inputs in the audio area.
The microphone switch connector is used to connect the switch of the <Push-to-Talk> button (PB) on the 'System operating unit and call station' PT1002-A1 hand-held microphone and the hook-off switch indicating that the microphone hangs in place (SW).
Microphone switch connector - 'Mic-S'
The <Push-to-Talk> button on the microphone
The switch indicating that the microphone hangs in place (SW)