An integrated unit for fiber management a protection function. Fiber Rack-Mount Enclosure shall be designed to house, organize and manage fiber terminations, connections, and patching in all applications. The efficient design of the splice area and bulkhead allows for maximum density while using just 1RU, 2RU or 4RU of valuable rack space. They support both cross-connect and interconnect architecture, and provide interfaces between outside plant cables and transmission. The 1RU FIS Rack Mount Enclosure accommodates (3) LGX adapter plates, modules or cassettes. Slide out trays and removable front and back doors allow easy access to the patch bay. So, which type should be used for your data.