1. Mate one plug of the 3G double-ended cable assembly marked with 3G to the  BNC connector marked with 3G, and mate the other plug to the PCB receptacle marked with 3G.
2. Mate one plug of the 12G double-ended cable assembly marked with 12G  to the  BNC connector marked with 12G , and mate the other plug to the PCB receptacle marked with  12G.

Note:

When mating, align the mating axes between the receptacle and plug, and insert the plug downward and perpendicular into the receptacle.

Do not insert the plug at a slanted angle.