Commo connections with the radio to your box are by means of a single RJ45 breakout board and a single RJ12 connector, the two mounted in the rear from the box. Commo from the box to your microphone is by means of a single RJ12 connector, which can be utilizing only 3 of your 6 wires: mic ground, hot, and 5v.The U8G is undoubtedly an upgraded Varia