ADEMCO AMC14X Installation And Operating Instructions Manual page 10

14-Inch Color Monitor
The monitor has both composite BNC connectors and Y/C mini DIN
connectors. The BNC connectors are auto terminating. The user can use the
output connector for loop-through video without setting a termination
switch.
The Y/C connectors can be switched between high impedance and 75 Ohm
termination. This allows the user to loop video through the Y/C connector.
2 AMC14