Many ask from where exactly the RJ45 term and interface originated, not to mention how and why it became the de facto interface for copper balanced twisted-pair Ethernet connections and why they can be wired in different ways.
The Ubiquitous RJ-45
Many ask from where exactly the RJ45 term and interface originated, not to mention how and why it became the de facto interface for copper balanced twisted-pair Ethernet connections and why they can be wired in different ways.