CN1373606A - Bidirectional data network transmission system based on coaxial cable of cable TV - Google Patents
Bidirectional data network transmission system based on coaxial cable of cable TV Download PDFInfo
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- CN1373606A CN1373606A CN01109285A CN01109285A CN1373606A CN 1373606 A CN1373606 A CN 1373606A CN 01109285 A CN01109285 A CN 01109285A CN 01109285 A CN01109285 A CN 01109285A CN 1373606 A CN1373606 A CN 1373606A
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Abstract
A bidirectional data network transmission system based on the coaxial cable of cable TV is composed of a client end, a head end, a repeater and a by-pass device. The bidirectional communication between client end and head end is conducted via the by-pass device of amplifier and the repeater. Said head end is connected to the backbone of metropolitan-area IP network. The client end is connected to the IP terminal of user.
Description
The present invention relates to a kind of bidirectional data network transmission system based on cable tv coax.
The urgency that broadband networks is built is along with the fast development of Internet (the Internet), constantly being doubled of number of netizens, and network economy is ready to appear already.Development of E-business will be improved our business environment greatly; Video telephone, tele-medicine, remote teaching, the virtual network shopping, video request program, network value added services such as online broadcast also have been eager to have a try, and wait in expectation and enter users big family early.Everything nothing does not require that interference networks in the future will carry hundreds of times to current network loaded information amount.Because present internet is to build on the basis of original telecommunications network, the telecommunications network that grows up based on speech business can not satisfy the requirement of above-mentioned network value added business to the network bandwidth but meanwhile.That is to say that present interference networks have become the bottleneck that network economy further develops, have only the bandwidth problem that solves the Internet as early as possible, just can make network that the huge motive force of economy is fully played out.
1. the construction bottleneck of broadband networks
It is generally acknowledged that broadband network should be made up of the intercity IP backbone in broadband, metropolitan area, broadband IP backbone and broadband access network.
1) construction of intercity IP backbone is very fast.Because declining to a great extent of fast development of optical fiber and fiber plant price, based on the solution of the intercity IP network of optical fiber technology comparative maturity, so the construction of the intercity key IP network in current various countries is all very fast.The basic network company that several families of current China are large-scale--China Telecom, UNICOM, Netcom, Jitong etc.--is also all in the intercity backbone IP network of being devoted to build oneself.
2) though the key IP network in metropolitan area is started late in the construction of China, gained all newcoming advantage.The communication network of Chinese city and cable TV network have all been laid a large amount of optical fiber, have formed the basic boom of metropolitan area IP backbone, do not need a large amount of investments just can build up the key IP network in metropolitan area and put into operation.
3) broadband access network then is the main bottleneck of the construction of current broadband networks.It all is narrow band access that original interference networks insert, and the interference networks of every household is inserted become that broadband access--this is a global technical barrier, just well-known " last kilometer " problem.Certainly, it is a best solution that optical fiber is registered one's residence, but huge input and long construction period definitely are " Distant water cannot quench present thirst ".
2. how to solve " last kilometer problem "
Last kilometer problem is a global technical barrier, and the way of solution is nothing more than two:
1) rewiring this be the ultimate broadband solution of registering one's residence.Optical fiber is registered one's residence, and it all is to solve the broadband access problem by rewiring that Fiber-To-The-Building limit, Category-5 twisted pair are registered one's residence etc.But rewiring is a very great engineering, need to drop into a large amount of man power and materials, and or not can realize in the short time.Rewiring has the threat that destroys the finishing effect for the dwelling house of having fitted up, also may cut off original buried wirring (particularly power line), and also there is inconvenience in the stay-at-home cooperation of resident family.The U.S. plans to finish optical fiber in 2015 and registers one's residence, and this shows the difficulty of rewiring.Another problem of rewiring is can not merge with existing access network to use, thus the inconvenience that brings business to carry out to operator.
2) original line attachment transformation
By transforming at the enterprising line width band of original line attachment, satisfy network user's broadband demand of present stage, should be present best solution.The U.S. has done many explorations in this respect, all is to be based on existing line attachment to realize that the broadband registers one's residence based on the DSL technology of communication network with based on the CABLE MODEM technology of cable TV network.But these technology are based on the network configuration of the U.S. rather than according to the network actual conditions development and Design of China, so from the Practice in China situation, result of use is not very desirable.
3. the present situation of China Broadcast ﹠ Television net
The construction of two more than ten years is crossed by China Broadcast ﹠ Television Netcom, has built up substantially at a high speed and wide television signal transmission system.Now, by the connecting system of Broadcasting Cable Network--the special coaxial cable of registering one's residence, Broadcasting Cable Network can be sent to huge numbers of families with TV programme like a dream.Coverage is than also wide many of telecommunications network.
Aspect the access of registering one's residence, Broadcasting Cable Network is than the congenital advantage with high bandwidth of telecommunications network.The broadcasting and TV system is as long as transform its connecting system, the network bandwidth of 30-40M just can be provided for the cable TV subscriber, the user just can enjoy the bandwidth applications service of high speed Internet access and VOD (video request program) etc. at once, and the broadband network system of Broadcasting Cable Network framework on original key fiber optic network can carry related service fully.
But existing Broadcasting Cable Network does not have the perfect control management system.Existing coaxial cable has only been born the downlink broadcast task of TV signal, adopt and share the formula transmission, thereby can not control single user's information flow-rate, so, the catv charge difficulty is perplexing Broadcasting Cable Network always, carries out the network insertion service and estimates also to have bigger difficulty.This present situation requires the broadcasting and TV system to find a kind of practical ways as early as possible, and the network broadband access service is provided, and wins new interests from the value-added service aspect of network and increases.
4. the broadband solution analysis of existing Access Network
1) based on the broadband solution of the existing Access Network of telecommunications
(1) ISDN is because the line design self of isdn dialup network access has been subjected to the restriction of 64K capacity, although telecommunications is attempting utilizing various technology that the speed of telephone wire is improved, such as the 2B+D of ISDN, 30B+2D etc., equipment at the following two ends of the situation that does not change circuit is given up, thereby speed is improved.But these effort also can only be expanded the existing network bandwidth and are 128K.And this lifting can not become truly " broadband ", and it can not satisfy the requirement of ecommerce, VOD program request broadband value-added service.
(2)ADSL
The ADSL technology is to be used in the world the existing telephone network is carried out a kind of current technology that transform in the broadband.Utilize this asymmetric transmission, can realize upstream bandwidth 800K, downlink bandwidth 8M.ADSL (asymmetric linear loop system) technology can be accomplished 10MHz, 8MHz, 6MHz on original circuit.But in order to realize the ADSL technology, at first will set up adsl loop road system and install equipment additional at the circuit two ends, the initial outlay of this transformation is quite big.And this technology exists the information passback time interference signal, and big logarithm cable outlet rate is not high, wants to improve speed again and also there is bigger difficulty in upgrade-system behind one-time construction.
This renovation technique should satisfy the demand of present stage people to the online bandwidth from the angle of bandwidth.But the construction cost of this transformation is so high.Price factor becomes the biggest obstacle that China Telecom extensively promotes the ADSL technology.
2) based on the broadband solution of broadcasting and TV Access Network
The cable television operators of developed country mainly are to use CABLE MODEM technology to solve the problem of cable TV subscriber's broadband access network.This technology is that coaxial cable trunk and coaxial cable amplifier are carried out bidirectional rebuilding, coaxial cable exit huge numbers of families increases a terminal equipment that is called as CABLE MODEM, CABLE MODEM links to each other with computer or set-top box in the family, the realization upstream bandwidth is 1M, downlink bandwidth is the asymmetric transmission of 30M, and numerous users share this bandwidth and realize high speed Internet access.The same with the ADSL technology, price becomes the obstacle of this technology popularization too.
The Another reason that CABLE MODEM technology is difficult to promote is its return noise problem.Because the limitation of time division technique, its return noise can't be well solved.From the situation of domestic pilot, the test effect of this technology is not very good.
Based on above-mentioned analysis, no matter be existing ADSL technology, or CABLE MODEM technology, not very good in the test situation of China.Our analyze and research real structure of existing access network of China on the basis of the access network system of existing telecommunications network and Broadcasting Cable Network, is developed the solution that the broadband access that meets China's actual conditions is transformed.
An object of the present invention is to provide a kind of cheaply based on the bidirectional data network transmission system of cable tv coax.
Operation principle of the present invention is as follows: native system comprises head end, bypass apparatus, repeater and client.Head end links to each other at a high speed with the metropolitan area backbone network by the Ethernet interface of standard, and the metropolitan area backbone network links to each other with INTERNET, and links to each other with bypass apparatus by coaxial cable; Bypass apparatus only allows the two-way intercommunication of data-signal, and the TV signal of simulation can't be passed through bypass apparatus, and still by original unidirectional amplifier, the transmission of TV signal is not subjected to the influence of bypass apparatus to TV signal; The place excessive in the data signal levels decay increases repeater, guarantees the normal transmission of data-signal; Client links to each other with the IP terminal equipment by the Ethernet interface of standard, and client is by above-mentioned repeater, bypass apparatus, head end and MAN and INTERNET high-speed interconnect simultaneously.
Simultaneously, because the present invention relates to just with the transformation of shaft portion, and usually under the situation of China the length of coaxial cable have only the 1-3 kilometer, the present invention becomes transmission problem about one 3 kilometers with the transmitted in both directions problem reduction of cable television system, makes system cost descend greatly.
Description of drawings
Fig. 1 is the schematic diagram that the bidirectional data network transmission system based on cable tv coax of the present invention is shown.
As shown in fig. 1, native system comprises head end 2, bypass apparatus 4, repeater 3 and client 1.
Bypass apparatus 4 is connected in parallel on the unidirectional amplifier 7 of existing cable television system.On mechanism, bypass apparatus 4 is equivalent to a bridge, and 4 of bypass apparatus copy data-signal the other end of bypass apparatus 4 to from an end of bypass apparatus 4, and analog signal is not owing to possess the feature of data-signal, bypass apparatus 4 does not allow analog signal to pass through, and analog signal is by unidirectional amplifier.Thereby bypass apparatus 4 is two-way straight-through for data-signal, ends for the analog signal high resistant.
Repeater 3 is by not having the gain band pass filter, being made up of gain high pass and low pass bidirectional filter.TV signal is not by having the gain band pass filter, transmission insusceptibly on the frequency range of 65-550MHz.Data-signal amplifies transmission by high pass and the low pass bidirectional filter that gain is arranged.
Do not need to carry out bidirectional rebuilding based on the existing one-way CATV transmission system of the present invention, just can realize that the long-term high speed of terminal use and INTERNET is connected.
Although specifically described implementation of the present invention hereinbefore, scope of the present invention is not limited by these details.
Claims (7)
1. the bidirectional data network transmission system based on cable tv coax is characterized in that comprising head end (2), bypass apparatus (4), repeater (3) and client (1), wherein:
Head end (2) links to each other at a high speed with the metropolitan area backbone network by the Ethernet interface of standard, and links to each other with bypass apparatus (4) by coaxial cable;
Bypass apparatus (4) makes data-signal can two-wayly pass through amplifier;
At the excessive coaxial cable place of data-signal decay, increase repeater (3), repeater amplifies again to the data-signal of decay;
Client (1) links to each other with repeater (3), bypass apparatus (4), the head end (2) of front end by the coaxial cable order.
2. the bidirectional data network transmission system of cable tv coax according to claim 1 is characterized in that, head end (2) is connected in parallel on the existing cable television system, and head end (2) sends and accept data-signal at the non-broadcasting channel of cable TV.
3. the bidirectional data network transmission system of cable tv coax according to claim 1, it is characterized in that, bypass apparatus (4) is to the data-signal two-way admittance, and do not allow analog signal to pass through, to the TV signal high-barrier from, make data-signal two-way by bypass apparatus, TV signal is passed through amplifier.
4. the bidirectional data network transmission system of cable tv coax according to claim 3 is characterized in that, bypass apparatus (4) copies to the other end with data-signal from the one end, thereby realizes the two-way admittance of data-signal.
5. the bidirectional data network transmission system of cable tv coax according to claim 1, it is characterized in that, repeater (3) only strengthens amplification to data-signal in the excessive place of data-signal decay with data-signal, does not influence the one-way transmission of TV signal simultaneously.
6. the bidirectional data network transmission system of cable tv coax according to claim 1 or 5, it is characterized in that, repeater (3) is by not having the gain band pass filter, being made up of gain high pass and low pass bidirectional filter, TV signal is not by there being the gain band pass filter, and data-signal amplifies transmission by high pass and the low pass bidirectional filter that gain is arranged.
7. according to the bidirectional data network transmission system of the described cable tv coax of claim 1, it is characterized in that, client (1) links to each other with terminal equipment by the Ethernet interface of standard, and client links to each other with MAN and Internet by above-mentioned repeater (3), bypass apparatus (4), head end (2) simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01109285A CN1373606A (en) | 2001-03-06 | 2001-03-06 | Bidirectional data network transmission system based on coaxial cable of cable TV |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01109285A CN1373606A (en) | 2001-03-06 | 2001-03-06 | Bidirectional data network transmission system based on coaxial cable of cable TV |
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| CN1373606A true CN1373606A (en) | 2002-10-09 |
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| CN01109285A Pending CN1373606A (en) | 2001-03-06 | 2001-03-06 | Bidirectional data network transmission system based on coaxial cable of cable TV |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008086670A1 (en) * | 2007-01-15 | 2008-07-24 | Hangzhou H3C Technologies Co., Ltd. | Ethernet receiving and sending device based on coaxial cable network and ethernet transmitting method |
| CN101227294B (en) * | 2007-01-15 | 2010-12-01 | 杭州华三通信技术有限公司 | Ethernet transmission method and Ethernet transmitting/receiving device based on coaxial cable network |
| CN101232305B (en) * | 2007-01-23 | 2012-07-25 | 杭州华三通信技术有限公司 | Method and apparatus for adapting Ethernet signal transmission |
-
2001
- 2001-03-06 CN CN01109285A patent/CN1373606A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008086670A1 (en) * | 2007-01-15 | 2008-07-24 | Hangzhou H3C Technologies Co., Ltd. | Ethernet receiving and sending device based on coaxial cable network and ethernet transmitting method |
| CN101227294B (en) * | 2007-01-15 | 2010-12-01 | 杭州华三通信技术有限公司 | Ethernet transmission method and Ethernet transmitting/receiving device based on coaxial cable network |
| CN101227295B (en) * | 2007-01-15 | 2011-02-02 | 杭州华三通信技术有限公司 | Ethernet transmission method and Ethernet transmitting/receiving device based on coaxial cable network |
| CN101232305B (en) * | 2007-01-23 | 2012-07-25 | 杭州华三通信技术有限公司 | Method and apparatus for adapting Ethernet signal transmission |
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