CN102970195A - Data transmission system and method for access network (AN) based on Ethernet over coax (EOC) - Google Patents
Data transmission system and method for access network (AN) based on Ethernet over coax (EOC) Download PDFInfo
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- CN102970195A CN102970195A CN2012104318921A CN201210431892A CN102970195A CN 102970195 A CN102970195 A CN 102970195A CN 2012104318921 A CN2012104318921 A CN 2012104318921A CN 201210431892 A CN201210431892 A CN 201210431892A CN 102970195 A CN102970195 A CN 102970195A
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Abstract
The invention belongs to the technical field of the AN and particularly relates to a data transmission system and a method for the AN based on the EOC. The system comprises a router switch, a control/media access control (MAC)/framing module, a modulator, a demodulator, a receiving/transmitting module of a downstairs grounding box device system; and a transmitter/separator, a modem, a set top box (STB) and a floor splitter of a floor system. The method includes frequency range division and data transmission; IP data are subjected to framing and packaging after passing a router, mixed with digital television signals, and subjected to high-frequency filter, filtered digital television and IP data signals are transmitted to the floor splitter through a coaxial cable, and the splitter sends the signals to all users on the floor respectively; and the separator on the user side separates digital television signals to the STB and IP data signals to the modem from the received signals. According to the system and the method, digital television and IP transmission can be performed simultaneously; the method is simple, easy to implement and efficient; and the cost is low.
Description
Technical field
The invention belongs to technical field of access networks, be specifically related to data transmission system and the method for the Access Network of a kind of support digital television signal based on EOC and IP Data Concurrent transmission.
Background technology
The radio and television Access Network namely refers to exchange to machine wire apparatus all between the user terminal, is the physical support of transfer of data.Radio and television need to serve as above key player, bring into play its important function, then must be by this physical support of Access Network.Access Network is being born the substantial responsibility that transmits broadcast and television information.Access Network design good and bad, whether whether simplify easy row, high efficiency, directly determined the radio and television result of broadcast; Simultaneously, the cost of following the Access Network design to implement to bring is also restricting the input that enterprise implements for Access Network.
Along with China NGB(China Next generation broadcasting network) proposition and the integration of three networks (telecommunications network, computer internet and the cable television network three fusion development of concept, interconnect, and progressively be integrated into the unified communication network in the world, the multiple services such as voice, data and radio and television are provided simultaneously for the client) carrying out, a hundred flowers blossom for the technology of Access Network and design, and HFC, the MoCA of the EPON of optical fiber access, the wifi of wireless access, coaxial pair of cable access and HomeplugAV of power line access etc. are wherein arranged.
Each technology has their quality, the present invention pays close attention to the trend of the integration of three networks, structure in conjunction with the existing Access Network of present broadcasting and TV, based on IEEE P1901 standard (physical layer (PHY) that IEEE P1901 working group passed through broadband power line communication in 2009 and the standard motion of media access control layer (MAC), and the first standard in issue working group in 2010), mainly realize a kind of Access Network design of carrying out simultaneously Digital Television and IP transmission.
Summary of the invention
The object of the present invention is to provide a kind of simple, efficiently, cheaply based on data transmission method and the system of the Access Network of EOC, in order to carry out simultaneously Digital Television and IP transmission.
The data transmission system of the Access Network based on EOC provided by the invention, comprise: land case device systems and floor system downstairs, wherein, the case device systems that lands downstairs comprises: router switch, control/MAC/ framing " module, modulator, demodulator, acceptance/emission " module, the floor system comprises: the transmitter/separator of user side, modulator-demodulator, set-top box, and floor splitter.
The data transmission method of the Access Network based on EOC provided by the invention, the concrete steps that are based on above-mentioned data transmission system are as follows:
One, frequency range is divided
Adopt active low frequency Eoc technology, frequency range according to concrete agreement support, the low frequency part of frequency range reasonably is assigned as four sections: uplink band, protection frequency range, IP data band and digital TV data frequency range, wherein uplink band is the low frequency part in three sections; Peek word bands of television signals two ends width is that 500kHZ is as the protection frequency range.
Two, data path transmission
1, the IP data are transferred to " control/MAC/ framing " module and are carried out framing and encapsulation through router switch;
2, after the encapsulation framing, send " accept/emission " module to through modulator, and after digital signal mixes, carry out High frequency filter, Threshold is the peak of uplink band, namely leaches Digital Television and the IP data-signal transmits to coaxial cable;
3, coaxial cable arrival floor splitter, splitter are sent to signal respectively each user of floor;
4, the separator of user side is isolated digital television signal to set-top box with the signal that receives, and isolates the IP data-signal to modulator-demodulator;
If 5 have upstream data, modulator-demodulator is passed to transmitter, transmitter is passed to the floor splitter, owing to may there be simultaneously upstream data again of a plurality of users, so the floor splitter adopts time division multiplexing, user's upstream data is sent to through coaxial cable lands " accepting/emission " module of case downstairs, accept transmitter module and carry out low-pass filtering, the frequency band of upstream data leached give demodulator, the demodulator deblocking is given " router switch " after tearing frame open, reach the IP data network.
Among the present invention, in the data path transmit stage, described IP data are through before the router switch, and the step of IP transfer of data is as follows:
1, scanning: when a new cable modem access network and after starting, cable modem will scan all downstream frequencys, seek discernible standard control information bag.
2, range finding: in order to realize synchronously, cable modem is determined the distance of it and user side by range finding.All medium access control protocols have a system-level clock, send ranging information to control each cable modem.
3, obtain the IP address: cable modem sends the DHCP request at backward channel.Head end router is transmitted to the dhcp address server with it after receiving the DHCP request.Server is beamed back an IP address to router, and router records and notify the user address.User such as sequence number that router also will be identified and store M AC address and cable are transferred the demodulator that flies swiftly is necessary address informations all.
After range finding, determining uplink and downlink frequency and IP address, cable modem just can carry out exchanges data.
Among the present invention, the frequency range of concrete agreement support is 7.5MHz-65MHz, and uplink band is 7.5MHz-10.5MHz; The digital TV data frequency range is 30MHz-65MHz.
The data transmission method of the Access Network based on EOC provided by the invention can carry out Digital Television and IP transmission simultaneously
,It is simple, and efficient, cost is low.
Description of drawings
Fig. 1 access net system structural diagrams.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
Be illustrated in figure 1 as the access net system structural diagrams.
According to demand and the development trend of China's Broadcasting Cable Network, the present invention adopts the scheme of " optical fiber+HomePlug AV(or based on IEEE P1901 host-host protocol) " as transmission and access technology.
At first, optical fiber is main trend as backbone transport, and the low-loss advantage of high bandwidth is arranged.The construction object of " light entering and copper back " above mentioned is complied with this trend just.But when setting up network propulsion to the residential quarter or Lou Dongshi, the cost of optical fiber increases sharply, and a lot of selection schemes is arranged this time.
HomePlug AV standard usable spectrum uses 917 subcarriers at 2-28MHz.Digital television signal uses MPEG-2 compressed encoding and QAM modulating mode.If we get the frequency band of a 6MHz, with frequency band two ends width be the frequency range of 500kHz as guard band, remaining 5MHz frequency range is carried out the 256QAM modulation.Because the code efficiency of 256QAM is 8bit/Hz, thereby total capacity is 40Mb just.Remove the 4Mb bandwidth of the required reservation of EDC error detection and correction, remaining 36Mb bandwidth can be supported 8 digital existing-quality television program channels that left and right sides quality is higher.Consider may changing of digital television signal, when not having a lot of image detail, the image file that obtains by compression is less, so just can utilize the frequency band that saves to carry out other data transfers.
If according to above way, the digital television signal that can transmit does not still reach requirement, therefore change the chip based on IEEE P1901.
Chip usable spectrum based on IEEE1901 can reach 7.5MHz-65MHz, and QAM modulation can reach 4096QAM, and is good in the coaxial cable performance.
Get the 30MHz-65MHz frequency range among the present invention as the transmission of digital television signal, 500kHz is still left as guard band in its both sides, use the 4096QAM modulating mode, so total capacity is 34 * 12=408Mb.Except the shared 40Mb frequency range of EDC error detection and correction, remaining 368Mb frequency range enough provides about 80 left and right sides quality higher existing-quality television program channel, or is more normal quality programs, and can satisfy the demand of using now.
Among the present invention, upstream band: 7.5MHz-10.5MHz.
Except the frequency band that has distributed, remaining 11MHz-30MHz frequency band can be used as the IP transfer of data.Specific implementation can be divided into following basic step:
(1) scanning: when a new cable modem access network and after starting, cable modem will scan all downstream frequencys, seek discernible standard control information bag.
(2) range finding: in order to realize synchronously, cable modem is determined the distance of it and user side by range finding.All medium access control protocols have a system-level clock, send ranging information to control each cable modem.
(3) obtain the IP address: cable modem sends the DHCP request at backward channel.Head end router is transmitted to the dhcp address server with it after receiving the DHCP request.Server is beamed back an IP address to router, and router records and notify the user address.User such as sequence number that router also will be identified and store M AC address and cable are transferred the demodulator that flies swiftly is necessary address informations all.
After range finding, determining uplink and downlink frequency and IP address, cable modem just can carry out exchanges data.
Among the present invention, suppose to have simultaneously IP data and digital television signal to transmit, the IP data are carried out framing and encapsulation through behind the router, after then mixing with digital television signal, intercepted to the signal of 11MHz at 7.5MHz, through again framing and encapsulation of demodulator.The signal that is higher than 11HMz through Optical Fiber Transmission to the building node, transfer to each user by coaxial cable, through separator the signal more than the 30MHz is transferred to set-top box, 11MHz gives modulator-demodulator to the signal of 30MHz.
Above-mentioned example only for signal, in the situation of not violating the principle of the invention and thought, to change and the modification that above-mentioned example is done, all should be regarded as within protection scope of the present invention.
Claims (4)
1. data transmission system based on the Access Network of EOC, it is characterized in that, comprise: land case device systems and floor system downstairs, wherein, the case device systems that lands downstairs comprises: router switch, control/MAC/ framing " module, modulator, demodulator, acceptance/emission " module, the floor system comprises: the transmitter/separator of user side, modulator-demodulator, set-top box, and floor splitter; Wherein, the flow process of data path transmission is:
(1) the IP data are transferred to " control/MAC/ framing " module and are carried out framing and encapsulation through router switch;
(2) after the encapsulation framing, send " accept/emission " module to through modulator, and after digital signal mixes, carry out High frequency filter, Threshold is the peak of uplink band, namely leaches Digital Television and the IP data-signal transmits to coaxial cable;
(3) coaxial cable arrival floor splitter, splitter are sent to signal respectively each user of floor;
(4) separator of user side is isolated digital television signal to set-top box with the signal that receives, and isolates the IP data-signal to modulator-demodulator;
(5) if upstream data is arranged, modulator-demodulator is passed to transmitter, transmitter is passed to the floor splitter, owing to may there be simultaneously upstream data again of a plurality of users, so the floor splitter adopts time division multiplexing, user's upstream data is sent to through coaxial cable lands " accepting/emission " module of case downstairs, accept transmitter module and carry out low-pass filtering, the frequency band of upstream data leached give demodulator, the demodulator deblocking is given " router switch " after tearing frame open, reach the IP data network.
2. data transmission method based on the Access Network of EOC is characterized in that concrete steps are as follows:
(1) frequency range is divided
Adopt active low frequency Eoc technology, the frequency range of supporting according to concrete agreement is assigned as four sections with the low frequency part of frequency range: uplink band, protection frequency range, IP data band and digital TV data frequency range, and wherein uplink band is the low frequency part in three sections; Digital television signal frequency band two ends width is that 500kHZ is as the protection frequency range;
(2) data path transmission
1. the IP data are transferred to " control/MAC/ framing " module and are carried out framing and encapsulation through router switch;
2. after encapsulating framing, send " accept/emission " module to through modulator, and after digital signal mixes, carry out High frequency filter, Threshold is the peak of uplink band, namely leaches Digital Television and the IP data-signal transmits to coaxial cable;
3. coaxial cable arrival floor splitter, splitter is sent to signal respectively each user of floor;
4. the separator of user side is isolated digital television signal to set-top box with the signal that receives, and isolates the IP data-signal to modulator-demodulator;
If 5. upstream data is arranged, modulator-demodulator is passed to transmitter, transmitter is passed to the floor splitter, the floor splitter adopts time division multiplexing, user's upstream data is sent to through coaxial cable lands " accepting/emission " module of case downstairs, accept transmitter module and carry out low-pass filtering, the frequency band of upstream data is leached give demodulator, the demodulator deblocking is given " router switch " after tearing frame open, reach the IP data network.
3. the data transmission method of Access Network according to claim 2 is characterized in that: in the data path transmit stage, described IP data are through before the router switch, and the step of IP transfer of data is as follows:
(1) scanning: when a new cable modem access network and after starting, cable modem scans all downstream frequencys, seeks discernible standard control information bag.
(2) range finding: in order to realize synchronously, cable modem is determined the distance of it and user side by range finding, and all medium access control protocols have a system-level clock, to control each cable modem transmission ranging information.
(3) obtain the IP address: cable modem sends the DHCP request at backward channel, after head end router receives the DHCP request, it is transmitted to the dhcp address server, server is beamed back an IP address to router, router records and notifies the user address, and user such as sequence number that router also will be identified and store M AC address and cable are transferred the demodulator that flies swiftly is necessary address informations all;
After range finding, determining uplink and downlink frequency and IP address, cable modem just can carry out exchanges data.
4. the data transmission method of Access Network according to claim 2 is characterized in that: the frequency range of described concrete agreement support is 7.5MHz-65MHz, and described uplink band is 7.5MHz-10.5MHz; Described digital TV data frequency range is 30MHz-65MHz.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110808923A (en) * | 2019-09-23 | 2020-02-18 | 华为技术有限公司 | Data transmission method, device, equipment and storage medium of distributed network |
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| CN101500180A (en) * | 2008-02-02 | 2009-08-05 | 普然通讯技术(上海)有限公司 | Method for reporting uplink communication need in real-time |
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| CN1708126A (en) * | 2004-06-09 | 2005-12-14 | 深圳市劲成宽频技术有限公司 | Network management method for optical node of optical fiber coaxle cable mixed network |
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| CN110808923A (en) * | 2019-09-23 | 2020-02-18 | 华为技术有限公司 | Data transmission method, device, equipment and storage medium of distributed network |
| CN115834270A (en) * | 2019-09-23 | 2023-03-21 | 华为技术有限公司 | Data transmission method, device, equipment and storage medium of distributed network |
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Application publication date: 20130313 |