Point-to-multipoint coaxial cable Ethernet transmission method, system and transmission apparatus

Abstract

The invention provides a point-to-multipoint supported Ethernet transmission method, a transmission system and a transmission device, which are applied to the distribution net of coaxial cables. The method includes that attenuation characteristic parameters between the access point of the Ethernet and the distribution net of the coaxial cables and between coaxial endpoints are determined. The sending and receiving parameters in the access point of the distribution net of the coaxial cables and the physical layer of the coaxial endpoints are calculated according the attenuation characteristic parameters. The frequency resources which are occupied by the access point of the Ethernet and the physical layer of the coaxial endpoints and a sending and receiving level are arranged according to the sending and receiving parameters. Under the premise of not influencing basic simulated television and digital businesses and based on a wired coaxial network, the new Ethernet transmission method is adopted by the invention to support the point-to-multipoint transmission of the baseband Ethernet on the present television coaxial networks. Particularly, the cost of the two-way reconstruction is low. Therefore, the invention is especially applied to the developing countries with dense population.

Description

technical field [0001] The invention relates to a point-to-multipoint Ethernet transmission method, in particular to a point-to-multipoint coaxial cable Ethernet transmission method, in particular, a point-to-multipoint cable TV coaxial distribution An Ethernet transmission method, a transmission system and a transmission device thereof for the network. Background technique [0002] In the existing cable TV fiber coaxial network (HFC), the TV program is transmitted from the front end to the optical node of the TV network close to the user through the optical fiber (generally, an optical node covers 300 to 500 users in the surrounding area). After the optical signal is converted into an electrical signal at the node, the TV signal is transmitted to each resident's home through the residential building through the coaxial cable distribution network. As people's demand for two-way transmission of new services (for example, interactive digital TV, broadband services such as dat...

AI Technical Summary

Problems solved by technology

[0021] However, when the access point on the coaxial distribution network transmits to the coaxial terminals of multiple TV users, the access point of the network is connected to each coaxial terminal, but the coaxial terminals are not connected to each other. , That is to say, the coaxial terminals of multi-TV users on the coaxial distribution network sometimes cannot detect the signals sent by each other to determine whether the transmission medium conflicts

Therefore, the above-mentioned Ethernet MAC layer protocol CSMA / CD cannot be used on the TV coaxial distribution network at this time

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