WHAT DOES UG8 LINK ALTERNATIF MEAN?

Commo connections with the radio on the box are by way of one RJ45 breakout board and a person RJ12 connector, equally mounted within the rear of your box. Commo within the box into the microphone is by means of just one RJ12 connector, that's applying only 3 of the 6 wires: mic ground, warm, and 5v.Just one part which i just recognized, and that's