2026 RJ45 and POE Pinout Guide
In today's connected world, we're all linked together. The pinout definitions for the most basic RJ45 interface (commonly called crystal head) may be essential reference material for engineering or troubleshooting. However, the POE protocol built on RJ45 is also frequently used in video surveillance, device power supply, and other applications. This article briefly summarizes the different pin definitions in RJ45 interfaces and POE specifications to help engineers with quick reference.