A router to router crossover cable uses two 8 position connectors and a UTP (Unshielded Twisted Pair) cable with differently wired connectors at each end. Despite the fact that a registered jack simply identifies a form factor rather than a pinout, crossover cables are often incorrectly marketed as “RJ45 crossover cables”. RJ45 is only a form factor, so the RJ45 designation should never be used to describe a wiring pattern.
