| 摘要 |
<p>Disclosed is an HFC network based broadband access system. The system includes a front-end access system,an HFC network and a terminal access system, wherein the front-end access system is provided with a CMFTS and a CDC, and the terminal access system is provided with a CMF and a transmission medium to a user terminal. The CMFTS is connected to an IP backbone network via a switch. There exist a mixer, an optical transmitter, a photoelectric conversion node, an up-converter, an optical receiver and an uplink distributor between CMFTS and CMF. By improving the network structure, network device and network bandwidth distribution of a DOCSIS network system, the bandwidth of the uplink channel is enlarged, uplink noises from an access cable are blocked, the transmission capacity of the network is enhanced, the functions of video stream multiplexing and de-multiplexing in the uplink and downlink channels are provided, a hybrid transmission of uplink data, voice and video is ensured, and the needs of triple network convergence are adapted to while ensuring the normal operation of devices such as the current analogue TV, EQAM, set top box, etc.</p> |
