Used for end user lines or trunk lines, and can be deployed and connected to the equipment. The distribution frame is the most important component in the management subsystem, and it is the hub that realizes the cross-connection of the two subsystems, vertical trunk line and horizontal wiring. Patch panels are usually installed on cabinets or walls. By installing accessories, the distribution frame can meet the needs of UTP, STP, coaxial cable, optical fiber, audio and video. The distribution frames commonly used in network engineering include twisted pair distribution frames and optical fiber distribution frames. According to the place of use and purpose, it is divided into two categories: main distribution frame and intermediate distribution frame.