 What is CAT 6A RJ45 wiring? The majority of structured cabling is terminated using the RJ45 termination standard. The RJ45 termination standard is found in CAT 5E through to CAT 6A. In the categories above CAT 7, similar elements of the RJ45 connector are still present with the addition of four additional connection points. However, all the categories still plug into one another and are therefore backward compatible. There are eight core colors within the connector and these are split into four pairs. These pairs are twisted together and the tightness of the twists increases by category. The colors pairs are blue, green, orange, and brown. These are consistent throughout the cable, module, and patch panel. Also, they are consistent through structured cabling categories. Therefore, regardless of the structured cabling category, transmission still occurs.