CN201550240U - Bidirectional digital television network and access system thereof - Google Patents

Bidirectional digital television network and access system thereof Download PDF

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Publication number
CN201550240U
CN201550240U CN2009202607193U CN200920260719U CN201550240U CN 201550240 U CN201550240 U CN 201550240U CN 2009202607193 U CN2009202607193 U CN 2009202607193U CN 200920260719 U CN200920260719 U CN 200920260719U CN 201550240 U CN201550240 U CN 201550240U
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China
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signal
access unit
moca
distribution network
telecommunication
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Expired - Fee Related
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CN2009202607193U
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Chinese (zh)
Inventor
李刚
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Shenzhen Coship Electronics Co Ltd
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Shenzhen Coship Electronics Co Ltd
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Abstract

The utility model discloses a bidirectional digital television network and an access system thereof. The access system comprises a first access unit and a second access unit, wherein the first access unit is connected to an optical fiber arterial grid, the second access unit is connected with the first access unit through a first coaxial distribution network and connected with a user end through a second coaxial distribution network, the first access unit is used for modulating light signals received on the optical fiber arterial grid to electric signals and radio frequency signals, the signals are output to the second access unit through the first coaxial distribution network after being mixed, the second access unit is used for separating and demodulating mixed signals output by the first access unit, and the electric signals are modulated again and are output to the user end through the second coaxial distribution network after being mixed with the radio frequency signals which are demodulated. The bidirectional digital television network comprises a business platform layer, a business gathering layer, a household user layer and the access system. The bidirectional digital television network and the access system can greatly improve the network data transmission speed, and have extremely low reconstruction cost.

Description

A kind of bidirectional digital television network and connecting system thereof
Technical field
The utility model relates to the digital television techniques field, particularly a kind of bidirectional digital television network and connecting system thereof.
Background technology
Traditional cable TV network is a unidirectional broadcast network, development along with information technology, the multiple network architecture of unidirectional TV network being carried out bidirectional rebuilding has appearred at present, as shown in Figure 1, for of the prior art based on low-frequency active EOC (Ethernet Over Coax, Ethernet transmits on coaxial line) the bidirectional digital television network framework, whole system is divided into four layers, ground floor is the business platform layer, comprises broadband services platform, charge system platform, digital television business platform and other business platforms; The second layer is the service convergence layer, comprises optical sender, OLT (Optical Line Terminal, optical line terminal), fiber optic backbone net, cable television network and broadband network; The 3rd layer is that sub-district corridor Access Layer comprises EPON ONU (Ethernet Passive Optical Network Optical Network Unit, Ethernet passive optical network unit), optical receiver, EOC local side apparatus and coaxial distribution network; The 4th layer is that domestic consumer's layer comprises EOC user side, STB (Set Top Box, set-top box) and PC.It is 5~30MHz that low-frequency active EOC uses frequency range, and transmission rate is 85Mbit/s, and transmission range can reach 500m.Therefore, as seen adopt low frequency EOC technology, make this bilateral network framework have the limited shortcoming of downlink bandwidth, and it is few to open number of users, an EOC local side is with 40 EOC terminals at most.
As shown in Figure 2, be the bidirectional digital television network framework based on MOCA technology (Multimedia Over CoaxAlliance, multimedia coaxial cable alliance) of the prior art, it equally also comprises four layers, wherein, the business platform layer is identical with the network architecture shown in Figure 1 with the service convergence layer.Its sub-district corridor Access Layer comprises EPON ONU, optical receiver and MOCA local side apparatus and coaxial distribution network, and its domestic consumer's layer comprises MOCA user side, STB and PC.MOCA is found in January, 2004, and the founder is Cisco, Comcast, EchoStar, Entropi, Motorola and Toshiba etc.The technical foundation of MOCA 1.0 standards is based on the c-link technology of U.S. Entropic company, this technology is used 800~1500MHz frequency range, each channel bandwidth is 50MHz, every section coaxial cable is supported 29 channels at most, a MOCA local side apparatus can be supported a plurality of channels, and each local side apparatus can be supported 31 MOCA ustomer premises access equipments again.Two-way physical transmission rate can reach 400Mbps in each 50MHz channel, and behind the use multichannel, the MOCA technology can obtain the speed of 1Gbps.Because this bilateral network framework need adopt 800~1500MH frequency range, but be the frequency range of 5~1000MHz at China's existing coaxial cable network, do not support the MOCA technology, therefore, this scheme makes the cost of the network rebuilding very high.
The utility model content
Technical problem to be solved in the utility model is: a kind of connecting system of bidirectional digital television network is provided, and it can improve message transmission rate, and network rebuilding cost is lower.
For addressing the above problem, the utility model discloses a kind of bidirectional digital television network connecting system, comprises first access unit that is connected to the fiber optic backbone net, connects first access unit and second access unit that is connected user side by the second coaxial distribution network by the first coaxial distribution network; Described first access unit is used for being modulated into the signal of telecommunication and radiofrequency signal with from the online light signal that receives of fiber optic backbone, mixes the back and outputs to second access unit by the first coaxial distribution network; Described second access unit is used for the mixed signal of first access unit output is separated and demodulation, and the signal of telecommunication modulated to mix with the radiofrequency signal after the described demodulation once more then outputs to user side by the second coaxial distribution network.
Wherein, described first access unit comprises EPON ONU, optical receiver and MOCA local side; Described EPON ONU is connected the fiber optic backbone net with optical receiver, described MOCA local side connects EPON ONU and optical receiver; Described EPONONU is used for the light signal of fiber optic backbone net output is converted to the signal of telecommunication; Described optical receiver is used for light signal is converted to radiofrequency signal; Described MOCA local side is used for the signal of telecommunication is modulated to the frequency range of 800~1500MHz, and mixes with radiofrequency signal, is transferred to the first coaxial distribution network.
Wherein, described second access unit comprises MOCA user side and low frequency EOC local side, described MOCA user side connects the MOCA local side by the first coaxial distribution network, is used for isolating radiofrequency signal from the mixed signal of MOCA local side output, and the signal of telecommunication of demodulation 800~1500MHz frequency range; Described low frequency EOC local side connects the MOCA user side, is used for the signal of telecommunication of MOCA user side demodulation is modulated to the low frequency signal of telecommunication, and outputs to the second coaxial distribution network after the radiofrequency signal of mixing MOCA user side output.
Wherein, described user side is a low frequency EOC user side, connects described low frequency EOC local side by the second coaxial distribution network, be used for isolating the radiofrequency signal and the low frequency signal of telecommunication from the mixed signal of low frequency EOC local side output, and the demodulation low frequency signal of telecommunication.
Wherein, the frequency range of the described first coaxial distribution network is at 800~1500MHz.
Technical problem to be solved in the utility model is: a kind of bidirectional digital television network is provided, and it can improve message transmission rate, and network rebuilding cost is lower.
A kind of bidirectional digital television network, comprise business platform layer, service convergence layer, domestic consumer's layer and be connected the service convergence layer and domestic consumer's layer between connecting system; Described connecting system comprise the fiber optic backbone net that is connected to the service convergence layer first access unit, connect first access unit and second access unit that is connected the user side of domestic consumer's layer by the second coaxial distribution network by the first coaxial distribution network; Described first access unit is used for being modulated into the signal of telecommunication and radiofrequency signal with from the online light signal that receives of fiber optic backbone, mixes the back and outputs to second access unit by the first coaxial distribution network; Described second access unit is used for the mixed signal of first access unit output is separated and demodulation, and the signal of telecommunication modulated to mix with the radiofrequency signal after the described demodulation once more then outputs to user side by the second coaxial distribution network.
Wherein, described first access unit comprises EPON ONU, optical receiver and MOCA local side; Described EPON ONU is connected the fiber optic backbone net with optical receiver, described MOCA local side connects EPON ONU; Described EPON ONU is used for the light signal of fiber optic backbone net output is converted to the signal of telecommunication; Described optical receiver is used for light signal is converted to radiofrequency signal; Described MOCA local side is used for the signal of telecommunication is modulated to the frequency range of 800~1500MHz, and mixes with radiofrequency signal, is transferred to the first coaxial distribution network.
Wherein, described second access unit comprises MOCA user side and low frequency EOC local side, described MOCA user side connects the MOCA local side by the first coaxial distribution network, is used for isolating radiofrequency signal from the mixed signal of MOCA local side output, and the signal of telecommunication of demodulation 800~1500MHz frequency range; Described low frequency EOC local side connects the MOCA user side, is used for the signal of telecommunication of MOCA user side demodulation is modulated to the low frequency signal of telecommunication, and outputs to the second coaxial distribution network after the radiofrequency signal of mixing MOCA user side output.
Wherein, described user side is a low frequency EOC user side, connects described low frequency EOC local side by the second coaxial distribution network, be used for isolating the radiofrequency signal and the low frequency signal of telecommunication from the mixed signal of low frequency EOC local side output, and the demodulation low frequency signal of telecommunication.
Wherein, the frequency range of the described first coaxial distribution network is at 800~1500MHz.
Compared with prior art, the utlity model has following beneficial effect: the utility model is by being divided into connecting system two access units, after first access unit is modulated into the speed higher signal with fiber-optic signal, pass through the demodulation of second access unit again, and be modulated into the signal that can on traditional coaxial distribution network, transmit again, therefore only need to transform the first coaxial distribution network, just can improve network data transmission speed greatly, and improvement cost is also very low.
Description of drawings
Fig. 1 is the bidirectional digital television network Organization Chart based on EOC of the prior art;
Fig. 2 is the bidirectional digital television network Organization Chart based on MOCA of the prior art;
Fig. 3 is a bidirectional digital television network Organization Chart of the present utility model;
Fig. 4 is a bidirectional digital television network connecting system structure chart of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
Embodiment 1
As shown in Figure 3, the bidirectional digital television network of present embodiment, it comprises business platform layer, service convergence layer, connecting system and domestic consumer's layer, described business platform layer comprises broadband services platform, charge system platform, digital television business platform and other business platforms, and the business platform layer is used to submit to video frequency program, charge service and other value-added services; Described service convergence layer comprises optical sender and OLT, is used for that the various data of business platform layer and signal are modulated into fiber-optic signal and transmits on the net at fiber optic backbone, and in the present embodiment, can for wavelength the fiber optic backbone net of 1550nm and 1310nm.Domestic consumer's layer comprises low frequency EOC user side, the PC that is connected to the EOC user side and STB.
As shown in Figure 4, the bidirectional digital television network connecting system of present embodiment comprises first access unit that is connected to the fiber optic backbone net, connects first access unit and second access unit that is connected the EOC user side by the second coaxial distribution network by the first coaxial distribution network; Described first access unit is used for being modulated into the signal of telecommunication and radiofrequency signal with from the online light signal that receives of fiber optic backbone, and the signal of telecommunication and radiofrequency signal output to second access unit by the first coaxial distribution network after mixing; Described second access unit is used for the signal of telecommunication of first access unit output and the mixed signal of radiofrequency signal are separated and demodulation, and the signal of telecommunication is modulated once more and mixes with the radiofrequency signal after the described demodulation and then output to the EOC user side by the second coaxial distribution network.
Described first access unit comprises EPON ONU, optical receiver and MOCA local side; Described EPON ONU is connected the fiber optic backbone net with optical receiver, described MOCA local side connects EPON ONU and optical receiver; Described EPON ONU is used for the light signal of fiber optic backbone net output is converted to the signal of telecommunication of 100Mbps; Described optical receiver is used for that cable TV signal with light signal partly is converted to can be in the radiofrequency signal of 110~860MHz of transmission over coaxial cable; Described MOCA local side is used for the signal of telecommunication of 100Mbps is modulated to the frequency range of 800~1500MHz, and mixes with the radiofrequency signal of 110~860MHz, is transferred to the first coaxial distribution network.
Described second access unit comprises MOCA user side and low frequency EOC local side, described MOCA user side connects the MOCA local side by the first coaxial distribution network, be used for the mixed signal of MOCA local side output is separated, the signal of telecommunication of 800~1500MHz wherein is demodulated into the signal of telecommunication of 100Mbps, isolates the radiofrequency signal of 110~860MHz; Described low frequency EOC local side connects the MOCA user side, is used for the signal of telecommunication of 100Mbps is modulated to the low frequency signal of telecommunication of 2~30MHz, and the radiofrequency signal of mixing 110~860MHz outputs to the second coaxial distribution network.
Described low frequency EOC user side connects described low frequency EOC local side by the second coaxial distribution network, is used for the radiofrequency signal that the low frequency signal of telecommunication with 2~30MHz is demodulated into the ethernet signal of 100Mbps and isolates 110~860MHz.The described signal of telecommunication and radiofrequency signal be respectively by PC and STB modulation, can realize surfing the Net and see the function of TV.
The hop that first access unit of present embodiment connects the first coaxial distribution network of second access unit adopts the band transmissions of 800~1500MHz, belong to the noiseless frequency range, the interference that is subjected in the signals transmission is significantly reduced, effectively improve the quality of signal transmission.Because the signal of telecommunication of MOCA technical finesse can only be in the transmission over coaxial cable of 800~1500MHz, therefore, in the present embodiment, the first coaxial distribution network is the frequency range of 800~1500MHz.
Because the MOCA technology can be supported on each channel and can connect 31 terminals simultaneously, each channel maximum has the physical data speed of 400Mbps, distance can reach 600m, therefore, compared to existing technology, the utility model can connect more user, and message transmission rate is higher, transmission quality is also higher, can support the promotion and application of value-added services such as HDTV (High-Definition Television) and two-way interaction program request.
Because adopting the EOC technology that the modulating and demodulating signal of MOCA equipment output is become can be at the signal of the transmission over coaxial cable of the existing 5-1000Mhz of China, thereby can transform the part of the second coaxial distribution network, greatly reduce network rebuilding cost.
In the present embodiment, first access unit can be arranged in the optical node of residential quarter, the optical node that the first coaxial distribution network can be arranged on the residential quarter is between each building of sub-district, second access unit can be arranged in the building, and the second coaxial distribution network is the existing coax network that is connected between relay point and each domestic consumer.Because central machine room and optical node in the existing sub-district all are arranged on the nearer place from the building basically, an optical node probably is responsible for 3 to 4 buildings, therefore the distance general hundreds of rice of each optical node from the building need the auxilliary netting twine that establish shorter, and the cost of transforming the first coaxial distribution network is just very low.
Embodiment 2
In the present embodiment, first access unit comprises ONU, optical receiver and UWB (Ultra-Wideband, ultra broadband) local side apparatus, and second access unit comprises UWB ustomer premises access equipment and EOC local side apparatus.
Present embodiment is compared with embodiment 1, is to have replaced the MOCA technology with the UWB technology generation.UWB is a kind of without carrier wave, and the mode that adopts extremely short pulse of the time interval to communicate is also referred to as impulse radio, time domain or carrierfree communication.This communication mode occupied bandwidth is very wide, and because the power density of frequency spectrum is minimum, can in the scope about 10 meters, realize the message transmission rate of hundreds of Mbit/s to number Gbit/s, has strong interference immunity, the transmission rate height, many advantages such as very bandwidth is wide, consumed power is little, sending function is little are mainly used in indoor communications, high-speed wireless LAN at present, fields such as home network, cordless telephone, safety detection, radar.After UWB carried out frequency reducing, also can on coaxial wire, transmit, and transmission rate can reach several Gbit/s.
Embodiment 3
In the present embodiment, first access unit comprises ONU, optical receiver and Wi-Fi (Wireless Fidelity, WiMAX) local side apparatus, and second access unit comprises Wi-Fi ustomer premises access equipment and EOC local side apparatus.
Present embodiment is compared with embodiment 1, is to have replaced the MOCA technology with the Wi-Fi technology generation.After UWB carried out frequency reducing, also can on coaxial wire, transmit, and transmission rate is suitable with the MOCA technology.
More than lift preferred embodiment; the purpose of this utility model, technical scheme and advantage are further described; institute is understood that; the above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all within spirit of the present utility model and principle; any modification of being done, be equal to replacement, improvement etc.; all should be included within the protection range of the present utility model; the interest field that the utility model is advocated should be as the criterion so that the utility model application scope is described, but not only limits to the foregoing description.

Claims (10)

1. a bidirectional digital television network connecting system is characterized in that, comprises first access unit that is connected to the fiber optic backbone net, connects first access unit and second access unit that is connected user side by the second coaxial distribution network by the first coaxial distribution network; Described first access unit is used for being modulated into the signal of telecommunication and radiofrequency signal with from the online light signal that receives of fiber optic backbone, mixes the back and outputs to second access unit by the first coaxial distribution network; Described second access unit is used for the mixed signal of first access unit output is separated and demodulation, and the signal of telecommunication modulated to mix with the radiofrequency signal after the described demodulation once more then outputs to user side by the second coaxial distribution network.
2. bidirectional digital television network connecting system as claimed in claim 1 is characterized in that, described first access unit comprises EPON ONU, optical receiver and MOCA local side; Described EPON ONU is connected the fiber optic backbone net with optical receiver, described MOCA local side connects EPON ONU and optical receiver; Described EPON ONU is used for the light signal of fiber optic backbone net output is converted to the signal of telecommunication; Described optical receiver is used for light signal is converted to radiofrequency signal; Described MOCA local side is used for the signal of telecommunication is modulated to the frequency range of 800~1500MHz, and mixes with radiofrequency signal, is transferred to the first coaxial distribution network.
3. bidirectional digital television network connecting system as claimed in claim 2, it is characterized in that, described second access unit comprises MOCA user side and low frequency EOC local side, described MOCA user side connects the MOCA local side by the first coaxial distribution network, be used for isolating radiofrequency signal from the mixed signal of MOCA local side output, and the signal of telecommunication of demodulation 800~1500MHz frequency range; Described low frequency EOC local side connects the MOCA user side, is used for the signal of telecommunication of MOCA user side demodulation is modulated to the low frequency signal of telecommunication, and outputs to the second coaxial distribution network after the radiofrequency signal of mixing MOCA user side output.
4. bidirectional digital television network connecting system as claimed in claim 3, it is characterized in that, described user side is a low frequency EOC user side, connect described low frequency EOC local side by the second coaxial distribution network, be used for isolating the radiofrequency signal and the low frequency signal of telecommunication from the mixed signal of low frequency EOC local side output, and the demodulation low frequency signal of telecommunication.
5. as each described bidirectional digital television network connecting system of claim 2 to 4, it is characterized in that the frequency range of the described first coaxial distribution network is at 800~1500MHz.
6. a bidirectional digital television network comprises business platform layer, service convergence layer and domestic consumer's layer, it is characterized in that, also comprises the connecting system that is connected between service convergence layer and the domestic consumer's layer; Described connecting system comprise the fiber optic backbone net that is connected to the service convergence layer first access unit, connect first access unit and second access unit that is connected the user side of domestic consumer's layer by the second coaxial distribution network by the first coaxial distribution network; Described first access unit is used for being modulated into the signal of telecommunication and radiofrequency signal with from the online light signal that receives of fiber optic backbone, mixes the back and outputs to second access unit by the first coaxial distribution network; Described second access unit is used for the mixed signal of first access unit output is separated and demodulation, and the signal of telecommunication modulated to mix with the radiofrequency signal after the described demodulation once more then outputs to user side by the second coaxial distribution network.
7. bidirectional digital television network as claimed in claim 6 is characterized in that, described first access unit comprises EPONONU, optical receiver and MOCA local side; Described EPON ONU is connected the fiber optic backbone net with optical receiver, described MOCA local side connects EPON ONU; Described EPON ONU is used for the light signal of fiber optic backbone net output is converted to the signal of telecommunication; Described optical receiver is used for light signal is converted to radiofrequency signal; Described MOCA local side is used for the signal of telecommunication is modulated to the frequency range of 800~1500MHz, and mixes with radiofrequency signal, is transferred to the first coaxial distribution network.
8. bidirectional digital television network as claimed in claim 7, it is characterized in that, described second access unit comprises MOCA user side and low frequency EOC local side, described MOCA user side connects the MOCA local side by the first coaxial distribution network, be used for isolating radiofrequency signal from the mixed signal of MOCA local side output, and the signal of telecommunication of demodulation 800~1500MHz frequency range; Described low frequency EOC local side connects the MOCA user side, is used for the signal of telecommunication of MOCA user side demodulation is modulated to the low frequency signal of telecommunication, and outputs to the second coaxial distribution network after the radiofrequency signal of mixing MOCA user side output.
9. bidirectional digital television network as claimed in claim 8, it is characterized in that, described user side is a low frequency EOC user side, connect described low frequency EOC local side by the second coaxial distribution network, be used for isolating the radiofrequency signal and the low frequency signal of telecommunication from the mixed signal of low frequency EOC local side output, and the demodulation low frequency signal of telecommunication.
10. as each described bidirectional digital television network of claim 7 to 9, it is characterized in that the frequency range of the described first coaxial distribution network is at 800~1500MHz.
CN2009202607193U 2009-11-20 2009-11-20 Bidirectional digital television network and access system thereof Expired - Fee Related CN201550240U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111654759A (en) * 2020-05-05 2020-09-11 上海云则信息技术有限公司 IP video transmission system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111654759A (en) * 2020-05-05 2020-09-11 上海云则信息技术有限公司 IP video transmission system

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EE01 Entry into force of recordation of patent licensing contract

Assignee: Nantong Coship Electronics Co., Ltd.

Assignor: Shenzhen Tongzhou Electronic Co., Ltd.

Contract record no.: 2011440020331

Denomination of utility model: Bidirectional digital television network and access system thereof

Granted publication date: 20100811

License type: Exclusive License

Record date: 20110907

CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20100811

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