This 4-wire station family with 39 keys is especially made for camera intercom.
It is possible to connect max.10 camera stations KV39 together.
Connector F1 (connector G1 for loop thru) is for camera 1-6
Connector F2 (connector G2 for loop thru) is for camera 7-12
Connector F3 (connector G3 for loop thru) is for camera 13-18
Connector F4 (connector G4 for loop thru) is for camera 19-24
Connector F5 (connector G5 for loop thru) is for camera 25-30
Connector F6 (connector G6 for loop thru) is for camera 31-36
Connector F7 (connector G7 for loop thru) is for camera 37-39
Anyway each camera station can speak with their own cameras or all
camera stations can speak with the same camera.
Each combination is allowed.
For more 4-wire stations with 39 keys see the list on the left-hand side.