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Menu Post
To Vehicle Detector
MENU SPKR
ALT ALERT
ALERT OUT
MENU SPKR
SHIELD
MIC
MIC
AUDIO OUT
3M Base Station
MENU
SPEAKER
MENU
MIC
COM
12V UNREG
VEH DET
MENU
SPKR
MENU
SPKR
MENU
SPKR
MENU
SPKR
SHLD SHLD
MIC IN MIC OUT
1
2
3
4
55
4
3
2
1
MIC OUTMIC IN
MENU INTERCOM
COM MIC IN
VEH DET MIC IN
SHLD SHLD
MIC OUT COM
MENU
SPKR
MIC OUT
AUDIO IN
A121 Noise Reduction Module
3M Audio-Level Control
Figure 3. Wiring for 3M C760/960/1060 Base Station with 3M Audio-Level Control Module
3M D15/D30 Intercom
Menu Post
A121 Noise Reduction Module
MENU
MIC
MENU
SPKR
MENU
SPKR
MENU
SPKR
MENU
SPKR
MENU
SPKR
SHLD SHLD
MIC IN MIC OUT
1
2
3
4
55
4
3
2
1
MIC OUTMIC IN
MENU INTERCOM
SPEAKER
MIC
MIC
SHIELD
SPEAKER
Figure 4. Wiring for 3M D15/D30 Intercom