CN1056024C - Comprehensive service network for cable television - Google Patents
Comprehensive service network for cable television Download PDFInfo
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- CN1056024C CN1056024C CN95102280A CN95102280A CN1056024C CN 1056024 C CN1056024 C CN 1056024C CN 95102280 A CN95102280 A CN 95102280A CN 95102280 A CN95102280 A CN 95102280A CN 1056024 C CN1056024 C CN 1056024C
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Abstract
The present invention relates to a multifunctional comprehensive service network for a cable television, which is composed of an optical cable or a coaxial cable. On a network of the cable television of the existing single cable, a bidirectional (an interactive type) data communication function is increased by using a mode of frequency splitting and is compatible with a baseband computer network; a data transmission rate is higher than 10Mbps, the radius of a transmission coverage area exceeds 60 kilometers, and design accords with IEEE802 international standard. The present invention is characterized in that in user nodes, the multifunctional comprehensive service network comprises a computer, a network card for playing the effect of a control interface of a communication protocol and a special radio frequency modem for combining the network card to use. Users can realize interactive data communication and the transmission of multimedia information between the users or the front ends of other task nodes in the service network by the device in the nodes.
Description
The present invention relates to a kind of comprehensive service network for cable television, especially relate to the comprehensive service network for cable television of high data rate in order to bi-directional transmission of information, be equipped with the function expansion that computer of the present invention, interface network interface card and dedicated modem make existing cable television network by user's node and server inter-node thereof at existing cable television network, realize between the different node in this net, and two-way data communication between node and the front end and multimedia messages transmission.
Technology with the multiple information of existing C ATV Network Transmission was known already, for example the disclosed patent application of WO93/11635 it utilize existing picture transmission network transmission multimedia communication information and realized that the comprehensive multipurpose of cable TV transmission network uses; The and for example disclosed patent application of US5208665, it when transmitting general pattern program and information, also can realize the service of multiple business, for example subscriber's TV shopping, visual telephony and health consultation or the like with existing C ATV net.Undoubtedly, in the past for the frequency spectrum resource that uses CATV rationally and effectively that is developed as of the comprehensive utilization of existing CATV net, improve its function aspects useful experience is provided, but the at present existing network of being realized by the comprehensive utilization that CATV is netted mostly has some shortcomings like this, low as speed, purposes specially is difficult for and other Web-compatible, shortcomings such as scope is little and involve great expense, the content that has two pieces of patent documentations listed above of the CATV integrated services network state of the art with basic reflection now is an example, the former gigantic project and be difficult for compatible, and the latter's range of application only is confined to transfer of data among a small circle, and type service is limited.
The objective of the invention is to overcome deficiency of the prior art, utilize existing CATV net constitute high compatible, easy to operate, on a large scale, multiduty integrated services network, it can realize the function of bidirectional high speed communication, thereby can realize such as multiple functions such as compunication, video/audio program request, monitor alarm, audio-visual education programme, Entertainment, e-mail, information retrieval, video telephone, electronic business transaction, stock and futures exchange, teletext, domestic medicines data, literal, sound, image with existing cable television network.
Specifically, the present invention adopts the CATV communication network of existing tree, in each server node and user's node and front end, increase a computer and a network interface card that plays the effect of communications protocol control interface, dispose a special-purpose radio-frequency modulator-demodulator again, thereby make the CATV cable network of the daily TV programme of original one-way transmission be transformed into transmitted in both directions Computer Data Communication net based on the frequency division multiplexing of this wired network.Like this, the user who is in the different node place can use its node network interface card and microcomputer separately to carry out interactively communication with the user at another node place or the front end of server node and network, and can realize any business service that this network passes loading capability that do not exceed simultaneously, real realization will have the CATV cable network now and become multimedia messages information transmitted highway transmission network.
In addition, owing to have good compatibility for existing software according to the microcomputer and the network interface card at use node of the present invention place, thereby provide great convenience for promotion and application of the present invention.Again owing to, vast domestic consumer is taken like a shot in the popularization of selecting for use on making of microcomputer and network interface card and the method for operation.
Cable TV integrated services network according to the present invention comprises transmission cable, amplifier, distributor, splitter and user's node and the webserver node of front end information source, tree; In all user's nodes and server node, all comprise a computer, a network interface card that plays the communication protocol control interface effect, and a special-purpose radio-frequency modulator-demodulator.In said network interface card, include a private communication protocol processor, a transceiver controller, a transceive data transducer, a decision circuit, a transcoder and a clock-signal generator.Here the private communication protocol of being said is meant the agreement that adopts token bus (transmission).Said special-purpose radio-frequency modulator-demodulator comprises the input and output loop that joins with cableport, and first branch road loop-coupled with this, that constitute by precoder, modulator and band pass filter, and second branch road that constitutes by another band pass filter, frequency converter, intermediate frequency amplifier and demodulator and baseband waveform treatment circuit thereof.Said transmission cable can adopt coaxial cable commonly used, also can adopt optical cable to constitute the transmission network of tree, and on transmission means, adopt the data transfer mode of the single cable of frequency division two-way (interactive mode), and positive and negative two-way band segmentation wherein can be low partitioning scheme, also can be middle partitioning scheme, even can be the frequency division mode of implementing at high band.Adopt method of the present invention and computer, interface network interface card and modulator-demodulator are put in the device of existing CATV node, can realize being higher than the message transmission rate of 10Mbps, and constituted a Broadband Computer Networks compatible fully with the base band computer network, and in whole design, meet the international standard of IEEE802, give full play to the tolerance limit ability of network on the implementation, and avoided the mutual collision of subscriber signal to greatest extent.
Come below to be further described with reference to figures 1 through 4 pairs of comprehensive service networks of the present invention, wherein,
Fig. 1 is the topology diagram of system;
Fig. 2 is the allocation plan of user's node;
Fig. 3 is the block diagram that the network interface card among Fig. 2 constitutes;
Fig. 4 is the formation block diagram of modulator-demodulator of the present invention.
With reference to figure 1, it shows according to the present invention a Broadband Computer Networks system of design, be one on the basis of cable TV, utilize coaxial cable and or optical cable realize the computer network system that two channels of Frequency Division Multiplexing system are set up.Satisfy the international standard of IEEE802 in design.
In Fig. 1, send node and convert the data message that microcomputer will transmit to be loaded with this information high-frequency signal through modulator-demodulator, it passes to network front end through some branches transmission cable along transmission cable/optical cable data feedback channel, become descending high-frequency signal there, by being input to the microcomputer that receives node after trunk cable/optical cable, distributor, splitter, the branch cable demodulation, whole transport process is along shown in the direction shown in Fig. 1 dotted arrow.These two nodes can also carry out reverse link communication by similar approach, and when execution was communicated by letter in the other direction, each node was being carried out opposite transmission-receiving function.
Fig. 2 is illustrated in the configuration block diagram at user's node of the present invention place.As shown in the figure, remove usually outside the television receiver at CATV node place, this moment, the node place also included microcomputer, the network interface card that is connected with this microcomputer as communication terminal (receiving/send out), and a modulator-demodulator that is connected between network interface card and the interface box.The user at any online node place only needs to be equipped with the equipment as figure, thereby common CATV net is become data communication network.When sending terminal, the user is by computer keyboard input transmission information, after the processing of network interface card, delivers to modulator-demodulator and networks and be sent to the purpose terminal; Modulator-demodulator, network interface card and microcomputer as the same preparation of the inter-node of receiving terminal are being carried out the operation opposite with transmitting terminal.Like this, with alternant way, the user on different node can utilize existing CATV net to realize two-way alternate communication.
Fig. 3 is the formation block diagram of network interface card shown in the presentation graphs 2.It comprises a communication controler, and reception is from the transceiver controller of this controller output signal, a transcoder and the decision circuit that data are provided to controller.For computer, network interface card has constituted a private communication interface circuit, to realize broadband data communication.It can make a clamp and directly insert in the bus duct in the computer and link to each other with the bus of microcomputer.The communication controler that is made of single-chip microcomputer (for example adopting UM90166 and series of products) links to each other with microcomputer bus, sends out the receiving literary composition with speed that can be higher than 10Mbps and the length that can reach 508 bytes.Its performed bus protocol mainly contains 5 kinds of master data forms, i.e. token (ITT), buffering area inquiry (FBE), message (PAC), affirmation replied (ACK) and denied replying (NAK).When node when sending terminal, after bus arrives communication controler, will receive and dispatch control signal and clock signal and transmission data through transceiver controller and transcoder by the data of microcomputer input again and send modulator-demodulator, deliver to network then.Otherwise when node during as receiving terminal, the data of coming from modulator-demodulator are sent to decision circuit and enter microcomputer terminal through communication controler again.
The above-mentioned Broadband Computer Networks of mentioning that microcomputer constituted is compatible mutually with the base band computer network, and can move multiple network softwares such as current popular Novell, LANMANAGER, UNIX, TGP/IP, NFS, so just the popularization for multi-functional communications service network involved in the present invention has brought convenience.
The structured flowchart of modulator-demodulator as shown in Figure 4.Pass through network interface card from the data that microcomputer is to be sent, being modulated into after encoded can be at the transmitting high-frequency signal of cable TV upstream channel transmission, and after front end carries out frequency translation, pass through the downlink channel of cable TV again, send to purpose user node according to station address.Deliver to the signal that receives the node terminal through downlink channel and enter the reception path, obtain corresponding reception data,, import MICROCOMPUTER PROCESSING, inquiry, demonstration, printing etc. at last again through the network interface card conversion through amplification, demodulation, shaping.
In sum, according to cable TV integrated services network of the present invention, be by being arranged on the modulator-demodulator in the cable TV node, network interface card and microcomputer make original CATV net expand to and can carry out data through this net from simple transmission TV programme, literal, sound, the bidirectional high speed communication of image, and can store this multiple different information, duplicate, editor and calculation process, thereby just determined integrated services network of the present invention to have the function of some very attractive, for example, computer media communication, VOD, public safety (fire-fighting, security personnel), television teaching, interactive video games (comprising Karaoke), e-mail, information retrieval, video telephone, electronic business transaction, stock, house property, futures exchange, teletext, the domestic system automation, domestic medicine or the like.
Introduced though the present invention is the embodiment with Fig. 1 to Fig. 4, can in the scope of its invention spirit, do many improvement by those skilled in the art, thereby its protection range should be limited by the content of appending claims.
Claims (5)
1, a kind of comprehensive service network for cable television, comprise front end information source, tree transmission electricity/optical cable, amplifier, distributor, splitter and user's node (comprising webserver node), it is characterized in that: in all nodes, comprise a computer, a network interface card that plays the communication protocol control interface effect, and a private cable modulator-demodulator; Network interface card comprises a private communication protocol processor, a transceiver controller, a transceive data transducer, a decision circuit, a transcoder and a clock-signal generator; The private cable modulator-demodulator comprises the input and output loop that joins with electricity/optical cable port, and first branch road loop-coupled with this, that constitute by precoder, modulator and band pass filter, and second branch road that constitutes by another band pass filter, frequency converter, intermediate frequency amplifier, demodulator and baseband waveform treatment circuit.
2, comprehensive service network for cable television according to claim 1 is characterized in that described multi-functional comprehensive service network for cable television is compatible mutually with the base band computer network as a Broadband Computer Networks.
3, comprehensive service network for cable television according to claim 1 is characterized in that described private communication processor is the agreement that adopts token bus (transmission).
4, comprehensive service network for cable television according to claim 1, it is characterized in that described multifunctional comprehensive service network is that mode with single cable two-way (interactive mode) realizes transfer of data, and the frequency band division of positive and negative direction wherein can be low partitioning scheme, also can be middle partitioning scheme, even can be the mode of implementing frequency division at high band.
5, comprehensive service network for cable television according to claim 1 is characterized in that can being higher than 10Mbps through the data rate of this net transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95102280A CN1056024C (en) | 1995-03-13 | 1995-03-13 | Comprehensive service network for cable television |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95102280A CN1056024C (en) | 1995-03-13 | 1995-03-13 | Comprehensive service network for cable television |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1121666A CN1121666A (en) | 1996-05-01 |
| CN1056024C true CN1056024C (en) | 2000-08-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95102280A Expired - Fee Related CN1056024C (en) | 1995-03-13 | 1995-03-13 | Comprehensive service network for cable television |
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| Country | Link |
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| CN (1) | CN1056024C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4234529B2 (en) * | 2003-08-12 | 2009-03-04 | 株式会社東芝 | Cable modem module device and electronic device |
| WO2008052452A1 (en) * | 2006-10-31 | 2008-05-08 | Hangzhou H3C Technologies Co., Ltd. | Configuration method, system and transceiver device for ethernet data transmission |
| CN101174976B (en) * | 2006-10-31 | 2010-09-08 | 杭州华三通信技术有限公司 | Point-to-multipoint coaxial cable Ethernet transmission method, system and transmission apparatus |
| JP4850286B2 (en) * | 2007-07-05 | 2012-01-11 | 三菱電機株式会社 | Digital video transmission system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1063593A (en) * | 1990-09-28 | 1992-08-12 | 内电视文字广播系统有限公司 | Interactive home information system |
| CN1093475A (en) * | 1989-11-09 | 1994-10-12 | 技术交易股份有限公司 | Computing machine and telephone device with user friendly computer interface and functional part |
-
1995
- 1995-03-13 CN CN95102280A patent/CN1056024C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1093475A (en) * | 1989-11-09 | 1994-10-12 | 技术交易股份有限公司 | Computing machine and telephone device with user friendly computer interface and functional part |
| CN1063593A (en) * | 1990-09-28 | 1992-08-12 | 内电视文字广播系统有限公司 | Interactive home information system |
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| Publication number | Publication date |
|---|---|
| CN1121666A (en) | 1996-05-01 |
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