High-speed coaxial digital access system

Abstract

The invention provides a high-speed coaxial digital access system, which is mainly formed by a hardware system and a software system, wherein the hardware adopts an IXP420 processor of the INTEL company and externally connects a Flash and a SDRAM via an address / data bus to form a processor small system, adopts a data interface to control a 4-channel signal processing unit (EN3011) to integrate the received / sent signals of a signal receiving and sending unit (EN1010) to provide the data bandwidth required by users, the utility model utilizes an Ethernet switching unit to provide device data access and device maintenance, provides a serial interface for the device maintenance, and provides a network management unit for real-timely monitoring the device operation state, the performance and the like and deploying and maintaining the device in real time, and the software system can realize automatic search to join in a network management system, and can realize configuration management, security management, fault management, performance management and remote update, thereby effectively realizing the integration of three networks.

Description

technical field [0001] The present invention relates to a digital access system, especially a high-speed coaxial digital access system (High speed Ethernet Cable Link, HECL for short) that uses wired coaxial cables to form a network and transmits the last 300 meters of data in three networks. . Background technique [0002] With the advancement of science and technology and the rapid development of Internet technology, data broadband technology has achieved unprecedented development, but the optimization and transformation of data broadband technology is costly and technically difficult. The ten-year investment of the two-way HFC network in the United States is almost 100 billion US dollars , with an average of US$1,500 per household. Facing the actual situation in my country, if the radio and television industry carries out the two-way transformation of the HFC network, the investment will be extremely huge. The current broadband data transmission technologies mainly include...

AI Technical Summary

Problems solved by technology

And the problem of low frequency interference is serious

[0007] EoC (Ethernet over Coax): Use the low frequency band (5 ~ 65MHz) of the cable TV coaxial cable network to transmit baseband Ethernet signals, the transmission rate is 10Mbps half-duplex, and the bandwidth is shared, and the transmission distance is relatively short, which obviously cannot meet the requirements

[0008] MoCA's c.LINK: can provide 31 users to share 100Mbps bandwidth. For future HDTV, the 20M bandwidth required by each user cannot be satisfied by the current C.link

[0009] Although FTTB (fiber-to-the-building) + LAN can realize the integration of three networks, there are social problems in the popularization of this solution because of the information privacy problem and the difficulty in residential wiring under the traditional Ethernet technology system. From the looks of it, the traditional Ethernet is a local area network rather than an access network. It is a peer-to-peer network without network management. For the requirements of the local access network for public users, LAN access has defects such as access distance less than 100 meters, too many active nodes, difficult management, and poor network reliability in terms of technology and networking, so this access technology is difficult further large-scale development

[0010] Although FTTC+xDSL can realize the integration of three networks, its special technical characteristics are: the higher the rate, the shorter the available distance. Therefore, in the actual line environment, the transmission distance of ADSL is difficult to exceed 5km. The new ADSL2 and extended ADSL2+ support The net downlink data rate can reach 16-25Mbps, and the uplink rate can reach more than 800kbps. However, when the access distance of ADSL2 / 2+ is greater than 7km and there is crosstalk, the uplink rate on the 0.4mm telephone copper cable can only guarantee 128kbps, the downlink rate is only guaranteed to be 192kbps, and the bandwidth cannot support the full service network

[0011] Although HFC+Cable Modem can realize the integration of three networks, its technical characteristics are: the point-to-multipoint star / tree coaxial cable network has the problems of upstream frequency band congestion, serious upstream noise interference (funnel effect) and shared bandwidth. To overcome these difficulties, we have to reduce the size of optical nodes, for example, from 2,000 households to 500-300 households. Even so, due to bandwidth sharing, the average transmission rate of each household is not enough to support high-speed interactive services, so the Cable Modem system is better than There is no advantage over ADSL system

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