CN103002351B - Data in network data transmission system send front end - Google Patents
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Abstract
According to embodiments of the invention, the data providing a kind of network data transmission system send front end, this network data transmission system adopts IP Signal Transparent Transmission Technology completely, from data send front end to data receiving terminal, namely to register one's residence be all passive fiber networking, these data send front end and comprise: data processing module, for encoding to the data of such as audio frequency and video etc. and IP packing, to generate IP packet; And convergence switch, its transmitting-receiving mouth is forced to be arranged to only send out, for exporting described IP packet to transmission network for transmitting described IP packet with 1Gb or more speed one-way transparent with the form of IP broadcast or multicast.
Description
Technical field
The present invention relates to communication technical field, the data particularly related in a kind of network data transmission system send front end.
Background technology
1, analog catv
The development of analog catv network (its transmission means as shown in Figure 7) is the process that wireless simulation transmission of television technology and radio access technology are moved on cable network.By adopting adjacent frequency technology and additional channel technology, substantially increase transmission channel quantity.
Fig. 8 shows the schematic diagram of the wireless transmission of simulated television, the wireless transmission mechanism of simulated television is that the audio/video flow that will transmit is modulated on the channel carrier frequency of regulation in advance by modulator, then transmitter by modulated carrier frequency to spatial emission, under the effect of antenna in the form of an electromagnetic wave at space propagation to TV (needing very strong transmitting power), TV receives the electromagnetic wave of transmitting terminal by antenna, demodulation is carried out by demodulator, reproduced image and sound accompaniment selected the frequency that will see by tuner frequency-selecting function after.
Fig. 9 shows the schematic diagram of the wire transmission of simulated television, the cable transport mechanism of simulated television is that the audio-video signal that will transmit is modulated on the channel carrier frequency of regulation in advance by modulator, then after having line amplifier to be amplified by modulated signal by co-axial cables transport to television set (not needing very strong through-put power), television set directly receives by tuner the high-frequency signal that co-axial cables transport comes, and demodulate audio-video signal by demodulator, reproduced image and sound accompaniment selected the frequency that will see by its frequency-selecting function after.
Simulated television wireless transmission and the difference of simulated television wire transmission are that transmission medium is different.
Simulated television wireless transmission and the common ground of simulated television wire transmission are that transmission mechanism is identical, and transmitting terminal transmits on the signal madulation that will transmit to carrier frequency, and receiving terminal reappears the signal be transmitted after carrying out demodulation.
Simulated television wireless transmission and simulated television wire transmission all must adopt modulation-demodulation technique (its general principle is as shown in Figure 10), this is because: broadcast transmission analog signal, the identifier that analog signal does not have oneself, is only had and is identified by carrier frequency.First demodulator finds the carrier frequency modulated by institute's signal transmission, demodulates transmitted signal after carrier frequency is removed, and therefore carrier frequency is the unique identification finding institute's signal transmission.Meanwhile, no matter how the frequency of signal transmission and amplitude change, carrier frequency is single-frequency, so it is unified to make the parameter of transmission circuit obtain, improves efficiency of transmission, greatly improves antijamming capability.
The advantage of analog catv is: one is owing to have employed adjacent frequency technology and additional channel technology, and the channel quantity of transmission is increased; Two is owing to have employed wire transmission, and effectively inhibit the reflex of space propagation, transmission quality is greatly improved.
The shortcoming of analog catv is: one is owing to adopting modulation technique, affecting by spacing wireless channel, and physical channel number is much smaller than planning channel number; Two is adopt analog-modulated technology, is difficult to maintenance operation index; Three is charge poor controllability, is difficult to guarantee service quality.
2, digital cable TV
What digital cable network transmitted is digital television signal.Figure 11 shows the schematic diagram of the transmission means of digital cable TV.As shown in figure 11, to digital television signal carry out compression coding multiplexing after, through digital modulator carry out modulation rear line transmission.User side television set does not possess digital demodulation function, additional Set Top Box to receive.
The advantage of digital cable TV is: one is still to utilize original analog network to transmit, but originally can transmit in the bandwidth of a set of analog television program, can transmit 6-8 cover digital television programs; Two is that toll administration is controlled, is conducive to improving service quality; Three is be conducive to network bi-directional, carries out more value-added service.
The shortcoming of digital cable TV is: transmission means is still failed break away from modulation-demodulation technique, thus there is following problem: one is still affect by spacing wireless channel, and physical channel number is much smaller than planning channel number; Two is that the later stage cannot meet bandwidth demand to when high definition or 3D Polarizations for Target Discrimination in Clutter because the bandwidth of planning is 1000M; Three is because radio network is unidirectional network, along with business development must carry out bidirectional transformation, could realize carrying out of interactive service.
To sum up, the transmission of broadcast television signal is registered one's residence mode, experienced by from analogue radio transmissions, simulation wire transmission to the pattern of digital cable transmission.At present, no matter be analogue radio transmissions, simulation wire transmission or Digital Television wire transmission, what transmission mechanism adopted is all mode tv baseband signal being modulated to broadcasting transmitting again after on carrier frequency.
3, cable TV network bidirectional transformation
Along with the development of digital cable TV, the transmission bandwidth of cable TV network, network bi-directional change into the new problem for we face.
1), EPON(EthernetPassiveOpticalNetwork, ethernet passive optical network)+LAN(LocalAreaNetwork, local area network (LAN)) mode
The condition realized: Fiber-To-The-Building head or optical fiber are to unit, and its networking logic as shown in figure 12.
The mode realized: two-wire is registered one's residence, and namely coaxial line and category-5 cable are registered one's residence simultaneously.
The advantage of which: one be original Coaxial Network quality meet prerequisite under need not change; Two be broadcasting and TV on the basis that legacy network retains, built again a carrier-class data network; Three is that standard is unified, meets NGB(NextGenerationBroadcastingNetwork completely, Next generation broadcasting network) technical standard.
The shortcoming of which: one is because built again a carrier-class data network on the basis of former network, strengthens cost and the difficulty of network bi-directionalization transformation; Two is increased care costs, safeguards that two throw the net.
2), EPON+EOC(EthernetoverCoax, Ethernet on coaxial cable) mode
The condition realized: Fiber-To-The-Building head or optical fiber are to unit, and its networking logic as shown in figure 13.
The mode realized: utilize data modulation technique or data base-band transmission technology that original coaxial line can be utilized to complete bidirectional transformation.
The advantage of which: one is register one's residence still to utilize the original coaxial line of broadcasting and TV, reduces the difficulty of construction that net changes; Two be net change cover cost low.
The shortcoming of which is: standard disunity, and bandwidth of registering one's residence is low, as standard of registering one's residence by category-5 cable bandwidth demand is proposed time, cover cost and cost sharp increase of registering one's residence.
3), CMTS(CableModemTerminalSystems, Cable Modem Terminal System) mode, i.e. HFC(HybridFiber-Coax, hybrid fiber/ coax, HFC) network mode
The condition realized: Fiber-To-The-Building head or FTTC, its networking logic as shown in figure 14.
The mode realized: utilize data modulation technique that original coaxial line can be utilized to complete bidirectional transformation.
The advantage of which: one is register one's residence still to utilize the original coaxial line of broadcasting and TV, reduces the difficulty of construction that net changes; Two be net change cover cost low; Three is that standard is unified.
The shortcoming of which is: bandwidth of registering one's residence is low, as standard of registering one's residence by category-5 cable bandwidth demand is proposed time, cover cost and cost sharp increase of registering one's residence.
4, broadcasting and TV fiber entering household
Along with the development of digital cable TV, the fiber entering household of cable TV network also becomes the new problem that we face.
1), radio network and data network mixing are registered one's residence
Implementation: by digital TV broadcast signal and VOD(VideoOrderDisplay, video request program) program request plug-flow signal is through QAM(QuadratureAmplitudeModulation, quadrature amplitude modulation) and IPQAM modulation after, carry out light modulation again to 1550nm wavelength, and after being amplified to certain luminous power, the PONOLT(OpticalLineTerminal transmitted with data, optical line terminal) the such as 1490/1310nm wavelength that exports registered one's residence by light passive mode after carrying out conjunction ripple, and its networking logic is as shown in figure 15.
End product: can existing product be utilized, such as existing Set Top Box, optical receiver (small-power enters house type), ONU(OpticalNetworkUnit, optical network unit) add independent light channel-splitting filter etc. and solve.Also integration product can be used, namely Set Top Box, optical receiver (small-power enters house type), ONU, optical branching filter integration.
The advantage of which is, makes full use of the standard a nd norm of original technical system, easily realizes.
The shortcoming of which is, although achieve fiber entering household, A platform transmission means still fails to break away from modulation-demodulation technique, thus there is following problem: one is still affect by spacing wireless channel, and physical channel number is much smaller than planning channel number; Two is that the later stage cannot meet bandwidth demand to when high definition or 3D Polarizations for Target Discrimination in Clutter because the bandwidth of planning is 1000M.
2), IPTV technology is adopted to register one's residence completely
Implementation: after digital TV broadcast signal and VOD program request plug-flow signal being broken into IP bag, together transmitted by PONOLT with other IP data-signals.Wherein digital TV broadcast signal transmits in IP group ripple mode, and VOD program request plug-flow signal is with the transmission of IP point broadcast mode, and its networking logic as shown in figure 16.
End product: can utilize existing product, such as existing IP Set Top Box, ONU etc. solve.Also integration product can be utilized, namely IP Set Top Box, ONU integration.
The advantage of which: one is the standard a nd norm making full use of existing IP technical system, easily realizes; Two is depart from traditional modulation-demodulation technique, there is not the maintenance issues of frequency interference and radio-frequency (RF) index.
The shortcoming of which is, because eliminate modulation-demodulation technique, same decrement and a set of program bandwidth of lower transmission increase 4--5 doubly, increase the bandwidth pressure (during a multiplex stream 38M, only needing 8M transmission bandwidth after QAM modulation) of IP metropolitan area network.
In sum, be necessary to research and develop a kind of new broadcasting and TV fiber entering household technology, the advantage of former radio network can be played, can merge completely with IP technology again.
Summary of the invention
the problem that invention will solve
As mentioned above, the present invention is intended to provide the data in a kind of new network data transmission system to send front end, this network data transmission system can play former radio network advantage, can merge completely with IP technology again, thus a perfect solution broadcasting and TV fiber entering household difficult problem, and these data transmission front end is one of key point realizing above-mentioned IP broadcast or multicasting technology.
for the scheme of dealing with problems
To achieve these goals, according to embodiments of the invention, the data providing a kind of network data transmission system send front end, this network data transmission system adopts IP transparent transmission broadcast technology completely, from data send front end to data receiving terminal, namely to register one's residence be all passive fiber networking, these data send front end and comprise: data processing module, for encoding to the data of such as audio frequency and video etc. and IP packing, to generate IP packet; And convergence switch, its transmitting-receiving mouth is forced to be arranged to only send out, for exporting described IP packet to transmission network for transmitting described IP packet with 1Gb or more speed one-way transparent with the form of IP broadcast or multicast.
Preferably, described IP packet is the audio, video data bag by such as 1550nm wavelength one-way transmission.
the effect of invention
The data that the embodiment of the present invention provides send front end and make corresponding network data transmission system can adopt IP broadcast or multicast completely, being all passive optical-fiber network, fully phasing out modulation-demodulation technique from front end to registering one's residence.By adopting IP broadcast or multicasting technology that audio, video data is broken into IP packet, sending front end from data and adopting passive fiber networking completely to data receiving terminal, substantially increasing the network operation stability of data receiving terminal.On the other hand, owing to eliminating modulation /demodulation equipment, avoid noise and nonlinear distortion that modulation /demodulation equipment brings, it also avoid space interference problem, no longer there is frequency restriction, and the bandwidth of radio network can be expanded to 10G, 20G by 1G.
Accompanying drawing explanation
Fig. 1 sends the networking logic diagram of the network data transmission system of front end for comprising the data provided according to the embodiment of the present invention;
The network data transmission system of the data transmission front end that Fig. 2 provides according to the embodiment of the present invention for employing comprises realizes the block diagram of IP broadcast or multicast fiber entering household solution;
Fig. 3 sends the block diagram of front end for the data that provide according to one embodiment of the invention;
Fig. 4 sends the block diagram of front end for the data that provide according to another embodiment of the present invention;
Fig. 5 sends the block diagram of the data receiving terminal in the network data transmission system of front end for comprising the data provided according to one embodiment of the invention;
Fig. 6 sends the block diagram of the data receiving terminal in the network data transmission system of front end for comprising the data provided according to another embodiment of the present invention;
Fig. 7 is the transmission schematic diagram of analog catv in prior art;
Fig. 8 is the schematic diagram of the wireless transmission of simulated television in prior art;
Fig. 9 is the schematic diagram of the wire transmission of simulated television in prior art;
Figure 10 is the schematic diagram of modulation-demodulation technique in prior art;
Figure 11 is the transmission schematic diagram of digital cable TV in prior art;
Figure 12 be in prior art EPON+LAN mode realize cable TV network bidirectional transformation for the networking logic diagram of Guang Zhandao building head ONU to unit;
Figure 13 be in prior art EPON+EOC mode realize cable TV network bidirectional transformation for the networking logic diagram of Guang Zhandao building head;
Figure 14 be in prior art CMTS mode (hfc plant) realize cable TV network bidirectional transformation for the networking logic diagram of Guang Zhandao building head;
Figure 15 adopts radio network and data network to mix the networking logic diagram that the mode of registering one's residence realizes broadcasting and TV fiber entering household;
Figure 16 is the networking logic diagram adopting IPTV technology to realize broadcasting and TV fiber entering household;
Figure 17 is the networking logic diagram of cable tv broadcast net; And
Figure 18 is the networking logic diagram of IPTV multicast network.
Embodiment
As mentioned above, the present invention is intended to provide a kind of new network data transmission system, its can play former radio network advantage, can merge completely with IP technology again.To first introduce the difference of radio network and IP network below.
Figure 17 shows the networking logic diagram of cable tv broadcast net.As can be seen from Figure 17, the bandwidth of initiator, transmission network bandwidth, bandwidth of registering one's residence are identical, and the bandwidth sum transmission network bandwidth of initiator does not increase with the increase of user.That is, all users under an initiator share the bandwidth sum transmission network bandwidth of initiator.
Figure 18 shows the networking logic diagram of IP network.As can be seen from Figure 18, the bandwidth sum transmission network bandwidth of initiator is identical, but not identical with bandwidth of registering one's residence, and the bandwidth sum transmission network bandwidth of initiator increases with the increase of user.
As can be seen here, the advantage of radio network is: band wide screen shared by radio network, and establishing of MAN cost is low.The shortcoming of radio network is: radio network is unidirectional network, does not possess interactive service function, needs bidirectional transformation could meet multiple interactive service.
On the other hand, the advantage of IP network is: IP network is Two-way Network, can support multiple interactive service.The shortcoming of IP network is: when IP network carries out cable television service, and the construction cost of metropolitan area network is risen sharply.As transmitted high-definition-television signal, and the transmission bandwidth of every programs is pressed 10M calculating, the IP network copy-point of a 100G can only provide 8000 concurrent streams.The demand that the city at 100 general-purpose families then needs the copy-point building 100G MAN transmission network and 125 100G could meet each user to watch simultaneously, its construction cost is higher.
In view of this, the basic ideas that the data that comprising provides according to the embodiment of the present invention send the network data transmission system of front end are: make full use of the advantage that radio network huge numbers of families share broadcast bandwidth, cancel the modulation-demodulation technique affecting bandwidth demand in current CHINA RFTCOM Co Ltd, the IP broadcast of employing audio/video flow or multicast mode substitute the pattern to broadcasting again after audio/video flow modulation, from front end to the IP broadcast or the multicast that all adopt and realize audio/video flow at passive fiber networking of registering one's residence.This solution extremely can be easy to solve the transmission bandwidth of cable network, network bi-directional, realize the difficult problem of CHINA RFTCOM Co Ltd fiber entering household.
Fig. 1 shows and comprises the networking logic diagram that the data provided according to the embodiment of the present invention send the network data transmission system of front end.Fig. 2 shows the block diagram utilizing the network data transmission system comprising the data transmission front end provided according to the embodiment of the present invention to realize broadcasting and TV fiber entering household.As shown in Figure 1 and Figure 2, the key of this network data transmission system is to adopt IP broadcast or multicasting technology completely, being all passive fiber networking, fully phasing out modulation-demodulation technique from front end to registering one's residence.
Specifically, the network data transmission system that the data that comprising provides according to the embodiment of the present invention send front end comprises: data send front end, comprise the convergence switch that transmitting-receiving mouth is forced to be arranged to only send out, for encoding to the data of such as audio frequency and video etc., IP packing, and IP packet to be exported via convergence switch with the form of IP broadcast or multicast; Transmission network, for 1Gb or more (such as 2.125Gb, 2.5Gb or 10Gb) speed one-way transparent transmission of IP data bag; Access Network, comprises the first switch for broadcast switch or multicast switch, for obtaining IP packet via the first switch from transmission network; And data receiving terminal, for obtaining IP packet from Access Network, IP packet is unpacked, decoded, thus playing audio-video data.Wherein, preferably, described IP packet is with the audio, video data bag of 1Gb or more (such as 2.125Gb, 2.5Gb or 10Gb) speed by such as 1550nm wavelength one-way transmission.
For above-mentioned network data transmission system, transmission network is preferably cable tv broadcast net, and the data of such as audio frequency and video etc. are preferably TS flow data or ASI flow data.In other words, cable tv broadcast end realizes IPization and IP broadcast or multicast.Fully phase out modulation-demodulation technique, signal is flowed to the cable TV TS after code multiplexing scrambling and carries out IP packing, and utilize IP broadcast or multicasting technology to broadcast.
Tool says it, and Fig. 3 shows the block diagram that the data that provide according to one embodiment of the invention send front end, wherein have employed data are encoded, the mode of multiplexing, scrambling process.The data that Fig. 4 shows to be provided according to another embodiment of the present invention send the block diagram of front end, wherein eliminate multiplexer compared with shown in Fig. 3.In addition, the data encryption process in front end is sent for data, encryption technology known arbitrarily can be adopted, such as CA encryption or DRM technology.For IP broadcast or multicast, adopt DRM technological merit higher.
Adopt IP broadcast or the multicast mode of audio and video data streams.First audio and video data streams is broken into IP bag, utilize the such as udp protocol of IP static broadcast technology, real IP streaming can be realized, but the precondition that must meet is: one is to have enough bandwidth of registering one's residence, this and present radio network transmitting terminal bandwidth sum end band of registering one's residence is wide equal large the same, and this condition can be solved by fiber entering household; Two is that terminal has enough disposal abilities, and this is equivalent to tuner and the demodulator of present radio network, and select the frequency and channel that you want in the frequency that can come in broadcast, this condition is now along with 10,000,000,000 process chip commercializations also can be resolved.So IP broadcast or multicast can realize under fiber entering household condition.
The program, because eliminate modulation-demodulation technique, so there is not frequency concept, thus overcomes space interference problem.But need larger Access Network bandwidth.Such as adopt the SD program of the 6M code check of MPEG-2 compression at present, after QAM modulation, 6 programs can be transmitted in 8M bandwidth, but IP mode is transmitted, need to take 36M transmission bandwidth.But, if adopt the optical module of the support 1Gb of technology maturation now or more (such as 2.125Gb, 2.5Gb or 10Gb) speed and support the process chip of 1Gb or more (such as 2.125Gb, 2.5Gb or 10Gb) speed, utilize on the naked fibre of Access Network simultaneously and adopt such as 1550nm wavelength broadcast, Access Network bandwidth is not just subject matter.
The advantage of the program adopts IP broadcast or multicasting technology completely, being all passive fiber networking, substantially increasing the operation stability of Access Network from front end to registering one's residence.Meanwhile, owing to eliminating modulation /demodulation equipment, the noise because modulation /demodulation equipment brings and nonlinear distortion are fully phased out.Owing to eliminating modulation-demodulation technique, not Existential Space interference problem, also without frequency restriction, along with optical module and process chip are constantly upgraded, radio network bandwidth can be expanded from present 1G bandwidth to 10G, 20G, 40G.
In addition, consider data service, adopt three wavelength transmission mechanism in above-mentioned network data transmission system net as shown in Figure 1, such as 1550nm wavelength transmission cable TV IP broadcast or multicast, such as other data service of 1490nm/1310nm wavelength transmission.Thus broadcast audio, video data is with the IP traffic of such as 1Gb or more (such as 2.125Gb, 2.5Gb or 10Gb) speed by such as 1550nm wavelength one-way transmission, and close ripple with the bi-directional transfer of data of the such as 1310nm/1490nm wavelength of PON system via wave multiplexer to transmit on an optical fiber, wherein PON system includes but not limited to EPON, GPON or 10GEPON system.
Tool says it, and as shown in Figure 2, transmission network is also preferably connected with VOD(video request program via router) platform, ISP the Internet and soft switch VoIP platform are one of at least.Correspondingly, Access Network also comprises optical multiplexer, is broadcast switch or the second switch, router, the OLT(optical line terminal of multicast switch) and/or VOD divide platform, make thus: obtain from transmission network, from the data of ISP the Internet and/or soft switch VoIP platform successively via router, the second switch, OLT and optical multiplexer input data receiving terminal; Obtain from transmission network, divide platform, OLT and optical multiplexer to input data receiving terminal via router, the second switch, VOD successively from the data of VOD platform; And to obtain from transmission network, the data that send front end from data are successively via the first switch and optical multiplexer input data receiving terminal.
As can be seen here, due to achieve on same optical fiber can either with the broadcast audio, video data of the one-way transmission IP data packet form of 1Gb or more speed (such as 2.125Gb, 2.5Gb or 10Gb), again can transmitted in both directions PON system data in a conventional manner, the network data transmission system provided according to the embodiment of the present invention also efficiently solves the problem of telecommunications, the Internet and the Broadcasting Cable Network integration of three networks.
In addition, for data receiving terminal, it is via a Fiber connection to Access Network, and the PON system data of transmitted in both directions and coexisting on this root optical fiber with the broadcast audio, video data of the IP data packet form of 1Gb or more speed (such as 2.125Gb, 2.5Gb or 10Gb) one-way transmission are transmitted.Make thus, data receiving terminal at least comprises optical branching filter, PON optical module, PON processing module, the light-receiving supporting 1Gb or more speed (such as 2.125Gb, 2.5Gb or 10Gb) and processing module and network exchange module.Wherein, optical branching filter is in order to be separated the IP broadcast inputted via an optical fiber or multicast audio, video data with other business datum, PON optical module is in order to receive and dispatch other business datum, support that the light-receiving of 1Gb or more speed (such as 2.125Gb, 2.5Gb or 10Gb) and processing module are in order to receive IP broadcast or multicast audio, video data, and network exchange module is in order to branch to suitable data-interface according to type of service by IP broadcast or multicast audio, video data and other business datum.On the other hand, data receiving terminal can adopt the mode of master terminal and secondary terminal to realize, and also can adopt the mode of standardized transmission terminal and application terminal to realize.
Tool says it, Fig. 5 shows the block diagram of the data receiving terminal in the network data transmission system provided according to one embodiment of the invention, wherein have employed the mode of master terminal and secondary terminal, and secondary terminal can be selected in two ways again, i.e. the secondary terminal (directly can use existing commercially available category-5 cable IP Set Top Box) of category-5 cable interconnection system and wireless connectivity pair terminal (directly can use existing commercially available WIFIIP Set Top Box).Fig. 6 shows the block diagram of the data receiving terminal in the network data transmission system provided according to another embodiment of the present invention, wherein have employed the mode of standardized transmission terminal and application terminal, and application terminal can be selected in two ways again, i.e. category-5 cable interconnection system application terminal and wireless connectivity application terminal.
In addition, in order to reduce the cost of data receiving terminal product, proposing Unidirectional light module scheme and customizing IP Unidirectional light module.Tool says it, in data receiving terminal, be preferably the 10Gb light-receiving shown in the optical module of the unidirectional receipts supporting 1Gb or more (such as 2.125Gb, 2.5Gb or 10Gb) speed, such as Fig. 5 and Fig. 6 and processing module for the optical module of the IP packet of input optical signal form, thus the cost of half can be saved compared with the optical module of the current bidirectional transmit-receive generally used.Further preferably, front end is sent in data, for exporting the optical module that the optical module of described IP packet is unidirectional with light signal form, wherein said IP packet is with the audio, video data bag of 1Gb or more (such as 2.125Gb, 2.5Gb or 10Gb) speed by such as 1550nm wavelength one-way transmission.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (1)
1. the data of network data transmission system send a front end, and this network data transmission system adopts IP Signal Transparent Transmission Technology completely, from data send front end to data receiving terminal, namely to register one's residence be all passive fiber networking, these data transmission front end comprises:
Data processing module, for encoding to the audio, video data of cable TV and IP packing, to generate IP packet, described IP packet is the audio, video data bag by 1550nm wavelength one-way transmission; And
Convergence switch, its transmitting-receiving mouth is forced to be arranged to only send out, for exporting described IP packet to cable tv broadcast net for transmitting described IP packet with 1Gb or more speed one-way transparent with the form of IP broadcast or multicast, the optical module exporting described IP packet with light signal form in this convergence switch is the optical module of unidirectional.
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