Patch cords are fiber made cords also known as fiber optical cables covered with connectors at the end that allow it to be connected to an optical telecommunication or a CATV equipment. It is used to connect the optical transmitter, receiver, PON boxes. Regularly used and widely applied in optical fiber management system.Racks are used for storage of servers, network switches, routers, DVR/NVR, telecommunications, hardware and other application devices that make efficient use of space and other resources.