A method of making a branch fiber optic cable assembly, comprising: (a) providing a main fiber optic cable extending along an axial direction, the main fiber optic cable (2) including a plurality of inner cords juxtaposed to each other, and an outer jacket sleeved. A method of making a branch fiber optic cable assembly, comprising: (a) providing a main fiber optic cable extending along an axial direction, the main fiber optic cable (2) including a plurality of inner cords juxtaposed to each other, and an outer jacket sleeved. The optical cable assembly, connectorized fiber cable is used in almost all applications for optical networks. It provides flexible connections between cables, devices and equipment. The individual cables with connectors at one or both ends are bundled. Our extensive offering of fiber optic cables, connectors, cassettes, enclosures, patch cords, cable assemblies, cable distribution products and accessories deliver high performance, reliability, and scalability. Our cable assemblies include the latest industry innovations in radio frequency. Our active optical cable assembly portfolio provides greater cable flexibility and longer reach, as compared to both traditional passive copper solutions and emerging active copper (ACC/AEC) solutions, supporting high performance computing, data center, and networking interconnect applications. An optical submarine branching unit for branching a trunk cable into first and second branch cables, including a pressure housing having a cylinder and first and second covers, a branching circuit unit accommodated in the pressure housing, a first feed through assembly mounted to the first cover so.