This draft Recommendation specifies the functional requirements of High performance Network over Coax (HiNoC) for high-speed data transmission over coaxial network in cable industry. IP technology is one of the foreseeable trends of next generation broadcasting network which needs fully support triple-play services, and rapidly increasing bandwidth demands for multi-channel video services. Therefore, it is necessary to define the functional requirements of HiNoC. This document contains descriptions for functional requirements of general system, physical layer and MAC layer function over coaxial network connected with Fiber To The Building. It also provide HiNoC operation-deployment scenario and use case as appendixes.