A detailed description of the patch panel Belden: Belden patch. Patch features in recent years, the construction of the actual work of optical communication through the use of several products of comparison, we believe that patch selection should focus on the following aspects. (1) the capacity of a patch panel should be such that the core cable core within the maximum number of innings complete shelves, where possible circumstances, may be interconnected on a few relatively large number of cables in a rack, to facilitate the deployment of the optical path. Meanwhile MDF capacity should correspond to the number of common core cable series, so when you use can reduce or avoid the mismatches caused by patch wasted capacity. (2) as a function of the type of patch cable line terminal equipment should have four basic functions. After the fixed-function cable into the rack, its outer sheath and strengthen the core to be mechanically fixed, the installation of ground protection components, make ends conservation treatment, and fiber are grouped and protection. After the accommodating function of fiber optic cable in the lead and tail welding cable, optical fiber coiled excess stored and protected fusion splices. Deployment feature on the associated pigtail connector plugged into the adapter, and the adapter on the other side of the optical light path to achieve the docking connector. Adapters and connectors should be able to insert a flexible, pull; light path can be freely deployed and tested. Storage function provides for a variety of cross-connection of the optical cable between the storage racks, so that they can rule neatly placed. Within the patch should be adequate space and ways to make this part of the optical cable traces a clear, easy to adjust, and can meet the requirements of the minimum bend radius. With the development of fiber optic networks, patch existing functionality can not meet the new demands. Some manufacturers will be some of the fiber-optic network components such as splitters, WDM and optical switches, etc. directly to the patch installation. Thus, even if these components easily applied to the network, gave patch adds functionality and flexibility. MDF is divided into: 8 patch, patch panels 12, 24 patch panels, patch panels 48