Ethernet chassis connectors can be fixed in a rack or flightcase and connected to the well-known RJ45 network connector. The special Ethercon connectors are extra-solid, reliable, well-built varieties, made by Neutrik. The A version is the most compact and comes at the lowest price, the B version is more robust and the D version is extra-reliable. The CAT6 is specifically intended for CAT6 cables. Ethercon chassis connectors perfectly match the special Ethercon plugs. Also check out the categories UTP Cable and Ethernet Cable Connector.