RJ11/RJ12/RJ45 Cables Amphenol Cables on Demand RJ11/RJ12/RJ45 Cables come in CAT5E, CAT6, and CAT6A variations and offer quick and easy installation. These cables offer a variety of colors, lengths, and speeds for Gigabit Ethernet applications. Amphenol’s RJ cables allow engineers to future-proof network performance and improve data integrity in the most severe EMI/RFI environments.