CN101568004A - CATV integrated access system - Google Patents
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- CN101568004A CN101568004A CNA2008100366525A CN200810036652A CN101568004A CN 101568004 A CN101568004 A CN 101568004A CN A2008100366525 A CNA2008100366525 A CN A2008100366525A CN 200810036652 A CN200810036652 A CN 200810036652A CN 101568004 A CN101568004 A CN 101568004A
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Abstract
The invention discloses a CATV integrated access system which comprises a head-end network controller and a user terminal connected with each other through a cable television coaxial cable. The head-end network controller is connected with a passive optical communication system; and the user terminal is connected with a set-top box, a PC machine or a home exchanger. In the system, a point (NC) to multipoint (CPE) communication is realized between NCs and CPEs by means of a coaxial cable system of a CATV operator; the NC is used as a network controller and deposed in a corridor or an apparatus box to realize high-speed data communication among CPEs, and coordinates the data communication of each CPE and bandwidth management. The whole system uses the MoCA technology compatible to MoCA standard. As a user terminal apparatus, the CPE is capable of being mounted in any CATV interface in the house of a user as a data communication terminal of the whole system to carry out a high-speed data communication with the NC and be managed by the NC.
Description
Technical field:
The present invention relates to cable TV signal transmission and access technology, particularly a kind of CATV integrated access system.
Background technology:
At present, it is the domestic and international research focus that the access of MoCA and coaxial cable is used always, and the maturity of correlation technique waits the check of actual environment.As far back as at the end of last century, some local cable television operators of China also have some operators utilizing the HomePNA3.0 technology to do network rebuilding trial just in test DOCSIS technology recently.Comprise CISCO, Motorola, Huawei Technologies are are all researched and developed in this field in interior how tame manufacturer.
At some problems that run in the practical application, relevant technology specifically has the following aspects also under study for action:
1. the problem of service quality
Traditional cable TV network is that design is used for transmitting broadcast TV program, does not have clear and definite requirement for bi-directional service, and the access technology on the current cable network exists bandwidth low on service quality, and it is limited to cover number of users, disturbs problems such as big:
(1) bandwidth problem:
DOCSIS: with relatively leading at present DOCSIS2.0 standard is example, theoretical downlink bandwidth of the shared 56M in 500 families and 30.72M be uplink bandwidth in theory, and in the network operation of reality, this numeral is 36M and 10M, general user's actual bandwidth peak value is about descending 700K, about up 240K.Broadband service is at present generally used, and this bandwidth not only can not satisfy present demand, more can't satisfy following demand.And this has been on the basis of the network rebuilding.The theoretical bandwidth of DOCSIS3.0 can be 3 times of DOCSIS2.0, but needing increases taking of broadcasting channel resource, and network is had higher requirement, at present also at the small-scale test phase, need more time to go checking, true also proof is not suitable for the national conditions of China.
WiFi and HomePlug technology are all used the OFDM technology, also can reach the data transfer rate of hundreds of Mbps in theory, but how to be applicable to the network of cable TV, need the time to go checking.
The MoCA technology adopts the EOFDM technology, band width in physical reaches 50MHz, totally 256 subcarriers, each subcarrier can (comprise BPSK from BPSK to QAM128 is adjustable according to environment, QPSK, 8PSK, QAM16, QAM32, QAM64, QAM128), single channel physical transmission rate reaches 270Mbps, and actual data throughout is up to 130Mbps, MoCA1.1 can reach 175Mbps, and can in same coaxial cable, use nearly 4-8 channel simultaneously, reach the above data throughout of 1Gbps, can satisfy the growth requirement of the 5-10 of operator.
(2) cover the number of users problem:
Each optical node of DOCSIS technology covers the user at most to 500 families, can form funneling effect after surpassing, and causes the collapse of whole network, and this is a unavoidable bottleneck.Because shared bandwidth is limited, in actual applications, every user's effective bandwidth also has bigger bottleneck, thereby causes value-added service effectively to carry out.
HomePNA designs for home network, and there is inadequate natural endowment number of users support aspect.
The HomePlug technology designs for powerline systems, and adaptive problem is arranged in coaxial cable applications, mainly shows to disturb greatly, and network-adaptive ability and managerial ability are poor.
Because profit glad " CATV integrated access system " adopts advanced modulation technique and reasonable frequency to distribute, and can significantly improve the ability that the user effectively covers, and solves the last 300 meters access problem of radio and TV operator.
(3) interference problem:
Because prior art adopts low frequency up more, the mode that high-frequency is descending, and because the complexity of cable TV network, there is interference problem in other transmission signals (comprising numeral and anolog TV signals and data-signal) in low frequency upward signal pair and the network, how to solve interference, improving the performance of whole network, is the problem that everyone is studying.The Frequency Design of moistening glad " CATV integrated access system " has been avoided this problem fully, and all uplink and downlink signals all on the frequency of existing broadcast singal, can not produce any interference problem to other signals.
2. Sheng Ji problem
How to solve system upgrade problem in the future, it also is the problem that everybody is paying close attention to, be mainly reflected in two aspects, one is that DOCSIS has been 3.0 till now, on the angle of technology, between supreme substantially again lift-off, the HomePNA technology has also developed into 3.0, but never has too big improvement in business promotion, and subsequent product is in confused situation, HomePlug mainly uses in the face of power line, does not also have the experience of large scale deployment aspect coaxial cable applications.From the sustainability angle of operation, must dispose a generation, a development generation is followed the tracks of a generation, does not have the tame operator can be oneself tying up on the technical foundation that does not have clear and definite technology path figure.From the technology path figure that can see now, the technology path figure of MoCA is very stable always, and industry alliance is also in the expansion that does not stop, for definite target will also be arranged future.
3. the problem that merges with Optical Access Network
At present nearly all cable television operators are at the deployed fiber Access Network, basic demand is to accomplish FTTC, Fiber-To-The-Building will be accomplished in place with good conditionsi, from the angle of userbase, require system can use the middle adjustment flexibly of the scale of unified technology from tens families to several one hundred houses.From the angle of economy and realizability, DOCSIS is fit to the access about 500 families, and HomePNA supports 64 families at most.MoCA can adapt to the 31-512 family, and can expand as the case may be.
4. the problem that merges with digital television business
Access Network is laid by cable TV network operator, except providing the broadband access function to the user, must merge with digital television business, implement the "Three-in-One Network", or Tripe is Play, allows the user realize function on a unified interface, enjoys service.Have several problems to need to consider here:
(1) voice service
It is the problem that any operator must face in future that voice service cheaply is provided, and when handling VoIP, safety and QoS are key factors.
(2) streaming media service
No matter be present video request program, still in the future two-way video phone and " blog " business, streaming media service all are the new directions determined of the Internet and digital television business in the future, how to define bandwidth and QoS, satisfying future to the streaming media service based on individuality, is an important problem.
(3) recreation
Recreation has been a huge industry, and the Internet has promoted the development of interactive game, and Digital Television will be brought the huge opportunity of another recreation development, and how define grid satisfies the development of Digital Television recreation, need do long-term planning.
Summary of the invention:
In view of the limitation of above-mentioned prior art and the development trend of cable TV access technology, the purpose of this invention is to provide a kind of CATV integrated access system.This system is in existing cable TV network, the technology of multiple innovations such as integrated use MoCA technology, converter technique, OFDM (OFDM) technology, embedded software technology and radio circuit designing technique is developed the integrated digital connecting system of cable television network.With to run into again laying-out, bandwidth availability ratio in the transformation of traditional cable TV network digital bidirectional low different, this system has utilized MoCA as primary access technology, taken into full account the technical characterstic of MoCA and to its safety, service quality in interior every requirement, make existing cable TV network operator realize that by simple device upgrade data at a high speed insert, and the opportunity of the large-scale promotion of the domestic and international Digital Television of combination, promote the cable TV bidirectional rebuilding, on cable TV network, implement the "Three-in-One Network".
In addition because this system is based on general MoCA chip development, during design with reference to the data-interface of various access net systems, make this project can to support various access platforms and the business on the cable TV network.
Do briefly bright respectively to the related know-why of system of the present invention below:
1.MoCA correlation technique introduction
MoCA
MoCA is Multimedia over Coax Alliance, is industry standard, and broadband access and home network products scheme based on coaxial cable are provided, the member of MoCA tissue comprises operator, system equipment manufacturer, chip supplier constitutes integrated industrial chain.
The MoCA technology can be utilized the existing coaxial cable network, in conjunction with optical communication technique, comes to provide high-speed wideband to insert to mansion and sub-district with it.
Can oppositely penetrate the cable distributor easily and need not to transform cable system and just can realize both-way communication, strengthen voice greatly, high-speed data inserts, the high-quality experience of HD video triple play.
Take frequency range 800-1550MHz, each channel bandwidth is 50MHz, every section coaxial cable is supported 4-8 channel at most, can connect 31 terminal clients simultaneously on each channel, two-way physical transmission rate can reach 270Mbps in each 50MHz channel, the useful data transmission rate is 130Mbps, and distance can reach 600m.
Adopt the network topology structure of point-to-multipoint, support 31 terminal (CPE) clients and a network management terminal (NC), this network is designed to and can subscribes, and uncontested mode adopts BOSS or dedicated network management software to manage that all contents that will transmit realize in the coaxial cable.
OFDM
OFDM (Orthogonal Frequency Division Multiplexing) OFDM, be MCM (Multi-Carrier Modulation, multi-carrier modulation) a kind of, in extensive use and the various wired and wireless communication system, such as WiFi, DVB-T/DMB-T, 4G (the 4th third-generation mobile communication), MoCA etc.
OFDM has availability of frequency spectrum height, and anti-fading ability is strong, and anti-intersymbol interference ability is strong, is fit to technical characterstics such as high speed data transfer.
2.MoCA technology is applied to cable TV network
Cable TV network also is CATV, generally adopts the networking mode of HFC (Hybrid Fiber Coax) hybrid fiber coax.
In the HFC structure, simple optical fiber is used for the front end of cable television network is linked the residential quarter of 200-1500 family family, these optical fiber are driven by the simulated laser transmitter of front end, and link on the fiber optic receiver and (be generally " node "), usually by telephone pole or user area pedestal.The output of these fiber optic receivers drives the coaxial net of user of a standard.
The HFC architecture is compared with traditional net of being made up of cable, main benefit is that it has eliminated a series of wideband RF amplifier, need be used for the front end of compensating coaxial main line to the signal attenuation of customer group, and these amplifiers are the performance of attenuation factor progressively, and requires a lot of the maintenance.In typical HFC architecture, support the cable television network broadcast program of standard to select, each optical fiber that in the past brings out is loaded with identical signal or channel.By using the passive fiber separator, to drive the multipath reception node, it is positioned at output place of front end generating laser.The HFC CATV network system can utilize single output optical fibre to reuse the bandwidth of interactive service.
Traditional CATV system is an one-way broadcasting network, if carry out bidirectional rebuilding with prior art, can run into following problem: the transmission of upward signal has a great problem, i.e. the interference of irrelevant signal in the bandwidth of traditional 5-30MHZ.This frequency range is loaded with international shortwave broadcasting and many other RF wireless services, and the fiber-coaxial net can cover a lot of square kilometres, has a large amount of bad connectors that gets loose or install, not the port of Zhong Zhiing, the rent of TV shielding in addition.As a big antenna, these signals that scatter and disappear are picked up pass front end back, subsidiary this signal from set-top box.Be dispersed in aerial RF in a large number and disturb, make the up wave band of 5-30MHZ partly be not useable for the signal of set-top box and the communication of interactive services.This interference changes with the variation of time in this day, and with the difference of node in the optical fibre-coaxial cable net difference.Therefore, the transmission strategy of upward signal must be: signal is enough strong, can solve these difficulties or change environment.Need to drop into a large amount of manpower and materials and transform existing network.Simultaneously, existing cable TV bi-directional communication device is also higher.
Along with popularizing of Digital Television, cable TV must carry out bidirectional rebuilding, to adapt to following business and service competition.The MoCA technology is used for existing catv network, and having does not need existing hfc plant is transformed, and equipment price is cheap, easy to maintenance and high bandwidth, the easily characteristics of upgrading.Utilize the characteristics of catv network broadcasting service efficient stable simultaneously, on the existing network basis, the cost that less input is carried out the miscellaneous service of bi-directional digital television, and the technical guarantee of high speed development in following 10 years is provided for cable television operators.
Introduction and analysis by above-mentioned know-why, CATV integrated access system of the present invention comprises head end network controller (Network Controller, be called for short NC) and two kinds of equipment of user terminal (CPE), two kinds of equipment connect by cable tv coax.Wherein, the head end network controller is connected with passive optical communications system (EPON ONU), and user terminal (CPE) links to each other with set-top box, PC or family's switch.
Its structure of head end network controller in the said system comprises Ethernet interface, coaxial cable interface, Ethernet PHY chip, network processing unit, Flash flash memory (nonvolatile memory), sdram memory, MoCA NC processor and frequency conversion chip.Wherein, network processing unit is connected with Ethernet PHY chip, flash, sdram memory and MoCA NC processor respectively.In addition, MoCA NC processor also is connected with the frequency conversion chip, and is connected with coaxial wire by coaxial cable interface.Ethernet interface directly is connected with netting twine by Ethernet interface with Ethernet PHY chip.
Its structure of user terminal in the said system comprises Ethernet interface, coaxial cable interface, Ethernet PHY chip, main control chip, Flash flash memory, MoCA NC processor and frequency conversion chip.Wherein, main control chip is connected with Ethernet PHY chip, flash and MoCA NC processor respectively.In addition, the MoCANC processor also is connected with the frequency conversion chip, and is connected with coaxial wire by coaxial cable interface.Ethernet interface directly is connected with netting twine by Ethernet interface with Ethernet PHY chip.
In addition, in front end (head end) equipment and terminal (user terminal) equipment that system of the present invention comprised:
1, the mode realization ratio of headend equipment and terminal equipment employing TDMA (time division multiple access) is 1:31.
2, headend equipment links to each other with access net system, and terminal equipment links to each other with digital TV set-top box or digital television, and the middle Cable Network network that adopts connects.
3, in system design, by with the docking of the integrated realization of network management system and operator network management system, whole system can be safeguarded, can run.
4, at the design aspect of headend equipment and user side:
(1) all adopt the chip of Entropic company, wherein front-end processor is EN3211 and EN1011, and the client accesses terminal and adopts EN3230 and EN1010 as acp chip.
(2) interconnected by the mode and the external equipment of Ethernet.
(3) operating system adopts built-in Linux 2.6.15 kernel.
The beneficial effect of system of the present invention is as follows:
1, the MoCA technology is applied to cable TV network and inserts, can replace existing wire cable access device fully, under situation about transforming, can directly in existing cable TV network, use, reduced network construction cost:
The manpower and materials that the cable TV two-way network house of correction need drop into are maximum investments during whole digital television bidirectional is transformed, it also is the present problem of the maximum that run into of all cable television operators, this programme does not need existing network is transformed, adopt the MoCA technology to be applied to cable TV network, the two-way solution of high bandwidth, high reliability is provided, reduce the initial stage network construction cost, reduced investment risk.
2, adopt this project product, realized that not only the high-speed wideband in the cable TV network inserts (single-frequency is put 31 families and shared the 270Mbps bandwidth), can significantly reduce the maintenance cost of operator simultaneously:
Realized in the high-speed wideband access in existing cable TV network, because based on general MoCA technology, system is simple, easily upgrading, easy care has significantly reduced the operating cost of operator, makes operator that carrying out of sustainable business and providing of good service can more be provided.
3, adopt this project product to realize that on family's coaxial cable multimedia is interconnected:
Along with popularizing of Digital Television and popularizing of the PC of family and other digital multimedia devices, digital home will no longer be a notion.This project product and system scheme have been set up digitized bridge between PC, Digital Television and media gateway, can ensure the seamless link of HD digital media content, make the user pass through the enjoyment that this access platform can be enjoyed digital multimedia.
4, in existing cable television system, realized not transforming the comprehensive access solution of existing network, can effectively reduce operation cost, implemented the "Three-in-One Network" by the MoCA technology.
Description of drawings:
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the internal structure block diagram of head end network controller in the system of the present invention.
Fig. 2 is the internal structure block diagram of user terminal in the system of the present invention.
Fig. 3 is the structured flowchart of NC software.
Fig. 4 is the system schematic of EPON+MoCA set-top box+broadband access method of introducing in the system embodiment of the present invention.
Fig. 5 is the system schematic of the EPON+MoCA broadband access method introduced in the system embodiment of the present invention.
Fig. 6 is the system schematic of the EPON+MoCA set-top box point broadcast mode introduced in the system embodiment of the present invention.
Embodiment:
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
According to the foregoing invention content, describe concrete technical scheme below in detail:
Referring to Fig. 1 and Fig. 2, the NC in the native system has adopted EN3211 and the EN1011 chipset of Entropic, and EN3211 is the MoCA protocol processor, adopt pci interface to link to each other with network processing unit, can handle the Bandwidth Management up to 31 terminals, QoS control is up to the data throughout of 130Mbps.EN1011 is the frequency conversion chip, the baseband signal of EN3211 is converted to the MoCA radiofrequency signal of 800MHz to 1550MHz.
Primary processor adopts the IXP420 network processing unit of Intel, and dominant frequency is 266MHz, and disposal ability is 400DMIPS, and pci interface is arranged, communication interfaces such as MII Ethernet interface.Be used for handling ethernet communication, the network management system client adopts built-in Linux operating system, and version is 2.6.15.
The structured flowchart of concrete NC software is referring to Fig. 3:
Hardware driving is each hardware device directly, and these hardware devices are abstracted into are upper strata operating system and drive the software interface that uses, respectively operating system and IP stack on hardware driving, operating system is responsible for mixing system resource and maintenance system operation, it on operating system the protocol stack of MoCA, be responsible for the normal operation of MoCA agreement on operating system, data packet unpacks and resource allocation.IP stack is responsible for the processing of IP communication aspects, on be UPD protocol stack and tcp protocol stack, be responsible for the processing of UDP bag and TCP bag, on MoCA, IP and tcp protocol stack MoCA background program and middleware, the MoCA background program is used for monitoring the operation of MoCA system, middleware is responsible for the more unified software interface of the corresponding one-tenth of system information is kept supplying a layer application software and called.On middleware, be the SNMP client and the Web control client of webmastering software, finish the work of network management and aspects such as online management, upgrading.
In addition, NC and CPE realize point (NC) to multiple spot (CPE) data communication by the coaxial cable system of cable television operators, and NC is deployed in corridor or the equipment box as network controller, and realize high-speed data communication between each CPE, and coordinate each CPE data communication, Bandwidth Management.Whole system adopts the MoCA technology, with the MoCA operating such.CPE is as subscriber terminal equipment, can be installed in the user family on any one cable TV interface, carries out high-speed data communication and accepts the management of NC as the data communication terminal of whole system and NC.
In real system inserts, except EPON+MoCA set-top box+broadband access (referring to Fig. 4) mode, also have EPON+MoCA broadband access (referring to Fig. 5) and EPON+MoCA set-top box program request (referring to Fig. 6) mode.
Fig. 4 is the application example of EPON+MoCA set-top box program request+broadband access, link to each other with the ONU of GEPON system at the system headend NC of optical node place, the bi-directional data signal of coaxial cable output mixes by the broadcast singal of duplexer with the output of light station, in coaxial cable system, transmit, at the user terminal place, CPE is connected in the coaxial cable system, carry out data communication with system headend NC, and data are connected to switch with the form of Ethernet, be connected with PC with set-top box (STB) respectively by switch, realize the function of program request of set-top box two-way video and PC broadband access online simultaneously.Being applicable to both needs to carry out video request program, needs the client of broadband access network business again.
Fig. 5 is the application example of EPON+MoCA broadband access, link to each other with the ONU of GEPON system at the system headend NC of optical node place, the bi-directional data signal of coaxial cable output mixes by the broadcast singal of duplexer with the output of light station, in coaxial cable system, transmit, at the user terminal place, CPE is connected in the coaxial cable system, carries out data communication with system headend NC, and, realize the demand of PC broadband access online with the PC connection of data with Ethernet.Be applicable to the client who needs the broadband access network business.
Fig. 6 is the application example of EPON+MoCA set-top box program request, link to each other with the ONU of GEPON system at the system headend NC of optical node place, the bi-directional data signal of coaxial cable output mixes by the broadcast singal of duplexer with the output of light station, in coaxial cable system, transmit, at the user terminal place, CPE is connected in the coaxial cable system, carry out data communication with system headend NC, and data are connected to set-top box (STB) with the form of Ethernet, realize the function of set-top box two-way video program request and other two-way value-added services.Be applicable to the user's request that both needs to carry out video request program.
Below be technical parameter setting concrete in the native system implementation process:
Bandwidth: single-frequency is put 31 families and is shared the 270Mbps bandwidth
System platform: 32 embedded systems, built-in Linux, 2.6.15 kernel
Modulation technique: EOFDM
Agreement: DHCP, RTP/RTSP
Safety: AES, TDMA
Configuration and webmaster: HTTP1.0, TFTP, SNMP1.0
More than show and described basic principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (7)
1, CATV integrated access system, this system comprises head end network controller and two kinds of equipment of user terminal, two kinds of equipment connect by cable tv coax; The head end network controller is connected with passive optical communications system, and user terminal links to each other with set-top box, PC or family's switch; It is characterized in that,
Its structure of head end network controller in the described system comprises Ethernet interface, coaxial cable interface, Ethernet PHY chip, network processing unit, Flash flash memory, sdram memory, MoCA NC processor and frequency conversion chip; Network processing unit is connected with Ethernet PHY chip, flash, sdram memory and MoCA NC processor respectively; MoCA NC processor also is connected with the frequency conversion chip, and is connected with coaxial wire by coaxial cable interface; Ethernet interface directly is connected with netting twine by Ethernet interface with Ethernet PHY chip;
Its structure of user terminal in the described system comprises Ethernet interface, coaxial cable interface, Ethernet PHY chip, main control chip, Flash flash memory, MoCA NC processor and frequency conversion chip; Main control chip is connected with Ethernet PHY chip, flash and MoCANC processor respectively; The MoCANC processor also is connected with the frequency conversion chip, and is connected with coaxial wire by coaxial cable interface; Ethernet interface directly is connected with netting twine by Ethernet interface with Ethernet PHY chip.
According to the CATV integrated access system of claim 1, it is characterized in that 2, it is 1: 31 that described system headend equipment and subscriber terminal equipment adopt the mode realization ratio of TDMA; Headend links to each other with access net system, and terminal equipment links to each other with digital TV set-top box or digital television, and the middle Cable Network network that adopts connects.
3, according to the CATV integrated access system of claim 1, it is characterized in that, described system all adopts the chip of Entropic company at headend and subscriber terminal equipment, and wherein front-end processor is EN3211 and EN1011, and the client accesses terminal and adopts EN3230 and EN1010 as acp chip; Mode and external equipment by Ethernet are interconnected; Operating system adopts built-in Linux 2.6.15 kernel.
4, according to the CATV integrated access system of claim 1, it is characterized in that, NC and CPE realize the point-to-multipoint data communication by the coaxial cable system of cable television operators in the described system, NC is as network controller, be deployed in corridor or the equipment box, and realize high-speed data communication between each CPE, and coordinate each CPE data communication, Bandwidth Management; Whole system adopts the MoCA technology, with the MoCA operating such; CPE is as subscriber terminal equipment, can be installed in the user family on any one cable TV interface, carries out high-speed data communication and accepts the management of NC as the data communication terminal of whole system and NC.
5, CATV integrated access system according to claim 1, it is characterized in that, described system can adopt the mode of EPON+MoCA set-top box program request+broadband access, link to each other with the ONU of GEPON system at the system headend NC of optical node place, the bi-directional data signal of coaxial cable output mixes by the broadcast singal of duplexer with the output of light station, in coaxial cable system, transmit, at the user terminal place, CPE is connected in the coaxial cable system, carry out data communication with system headend NC, and data are connected to switch with the form of Ethernet, and be connected with PC with set-top box respectively by switch, realize the function of program request of set-top box two-way video and PC broadband access online simultaneously.
6, according to the CATV integrated access system of claim 1, it is characterized in that, described system can adopt the mode of EPON+MoCA broadband access, link to each other with the ONU of GEPON system at the system headend NC of optical node place, the bi-directional data signal of coaxial cable output mixes by the broadcast singal of duplexer with the output of light station, in coaxial cable system, transmit, at the user terminal place, CPE is connected in the coaxial cable system, carry out data communication with system headend NC, and, realize the demand of PC broadband access online with the PC connection of data with Ethernet.
7, CATV integrated access system according to claim 1, it is characterized in that, described system can adopt the mode of EPON+MoCA set-top box program request, link to each other with the ONU of GEPON system at the system headend NC of optical node place, the bi-directional data signal of coaxial cable output mixes by the broadcast singal of duplexer with the output of light station, in coaxial cable system, transmit, at the user terminal place, CPE is connected in the coaxial cable system, carry out data communication with system headend NC, and data are connected to set-top box with the form of Ethernet, realize the function of set-top box two-way video program request and other two-way value-added services.
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| CN109348255A (en) * | 2018-10-19 | 2019-02-15 | 广州珠江数码集团股份有限公司 | A method of 4K high-definition program is transmitted using OFDM technology |
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| CN101764801B (en) * | 2009-12-02 | 2014-12-10 | 中兴通讯股份有限公司 | Family information processing method and system |
| CN102164255A (en) * | 2010-01-21 | 2011-08-24 | 约翰·梅扎林瓜联合有限公司 | CATV entry adapter and method for preventing interference with eMTA equipment from MoCA signals |
| CN101882988A (en) * | 2010-06-09 | 2010-11-10 | 广东新一信通信发展有限公司 | Broadband access technique for realizing three networks in one |
| CN101924657B (en) * | 2010-08-31 | 2012-09-05 | 广州杰赛科技股份有限公司 | Method for geographic information-oriented management of MOCA equipment |
| CN101924657A (en) * | 2010-08-31 | 2010-12-22 | 广州杰赛科技股份有限公司 | Method for geographic information-oriented management of MOCA equipment |
| CN102546316B (en) * | 2010-12-20 | 2014-11-19 | 上海大亚信息产业有限公司 | Head-end equipment of Ethernet over coax |
| CN102571386A (en) * | 2010-12-20 | 2012-07-11 | 上海大亚信息产业有限公司 | Upgrading method for EOC terminal equipment |
| CN102571386B (en) * | 2010-12-20 | 2014-10-15 | 上海大亚信息产业有限公司 | Upgrading method for EOC terminal equipment |
| CN102546316A (en) * | 2010-12-20 | 2012-07-04 | 上海大亚信息产业有限公司 | Head-end equipment of Ethernet over coax |
| WO2012146108A1 (en) * | 2011-04-25 | 2012-11-01 | 中兴通讯股份有限公司 | Iptv home network system based on coaxial cables and data processing method therefor |
| CN102186047A (en) * | 2011-04-25 | 2011-09-14 | 中兴通讯股份有限公司 | Coaxial-cable-based Internet protocol television (IPTV) home network system and data processing method thereof |
| CN102186047B (en) * | 2011-04-25 | 2015-06-03 | 中兴通讯股份有限公司 | Coaxial-cable-based Internet protocol television (IPTV) home network system and data processing method thereof |
| CN109417610A (en) * | 2016-10-21 | 2019-03-01 | 华为技术有限公司 | Spread spectrum in cable network |
| CN109348255A (en) * | 2018-10-19 | 2019-02-15 | 广州珠江数码集团股份有限公司 | A method of 4K high-definition program is transmitted using OFDM technology |
| CN109348255B (en) * | 2018-10-19 | 2021-08-03 | 广州珠江数码集团股份有限公司 | Method for transmitting 4K high-definition program by applying OFDM technology |
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