144 Core Optic Splice Joint Closure Horizontal Types 4 in 4 out F016 are used to distribute, splice, and store the outdoor optical cables which enter and exit from the ends of the closure. There are two connection ways:direct connection and splitting connection. This joint closure is designed to effectively distribute and splice outdoor optical cables at the entry and exit points. With both direct and splitting connection options, it provides versatile and reliable functionality for your network need.