The indoor optical receiver — also referred to as an indoor optical node or fiber optic receiver — is the active device installed at the fiber termination point inside a building, equipment room, or distribution cabinet, where it receives the modulated optical signal from the. The indoor optical receiver — also referred to as an indoor optical node or fiber optic receiver — is the active device installed at the fiber termination point inside a building, equipment room, or distribution cabinet, where it receives the modulated optical signal from the. Indoor Optical Cable is intended primarily for use within an environmentally controlled structure (e., home, commercial, or controlled environment vault) to transport optical signals within that structure. Indoor cables may also be designed and rated for limited outdoor use, often between. Indoor fiber cable is the backbone of modern communication networks within buildings, providing the high-speed data transmission necessary for everything from business operations to home entertainment. 103 describes characteristics, construction and test methods for optical fibre cables for indoor applications. Thus the cables are generally designed to provide high tensile strength, crush resistance and to withstand temperature changes between -40°C and +70°C with attenuation changes as low as possible.