 Do Cat6A cables work with Cat6 and Cat5e? As previously discussed, structured cabling categories will all work with one another due to the RJ45 connector. However, the overall structured cabling link will only work to the limit of its weakest point. Thus, the overall performance of the cabling will be rated as the lowest category that is present in that wiring. However, the transmission will still occur. For example, if a Cat6A cabling link is installed and Cat5e patch leads are used, then the performance is only capable of Cat5e performance. Plus, the overall link loses its ability to transmit 10 gigabit ethernet. This is a common problem we see when clients move into a new building and use their old patch leads from their previous building.