CN101094375A - Method and device for carrying out remote both way communications by using cable TV network - Google Patents
Method and device for carrying out remote both way communications by using cable TV network Download PDFInfo
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Abstract
The apparatus comprises: a bidirectional data communication device and a network adapter. Said network adapter is mounted on the user end; said bidirectional communication device is mounted on the node of cable TV distribution network. It also comprises a bidirectional repeater and a bandwidth detector. Said bandwidth detector automatically detects the available unused bandwidth in the cable TV distribution network, and allocates said unused bandwidth to the bidirectional data communication.
Description
Technical field
The invention belongs to the data communication field, more specifically, relate to a kind of existing cable television distribution network that utilizes, carry out the method and apparatus of remote both way communications.
Background technology
In recent years, the demand growth of home data service is very swift and violent, traditional wired telephone network can not satisfy the demand of data communication gradually, and then cost is too expensive again to set up new cable system again, and people are seeking a kind of more efficient and cheap solution always.Cable television network is the hybrid network of optical fiber and cable, and its leading portion adopts optical fiber, and the back segment distribution network adopts cable, it is through for many years construction, connect huge numbers of families, user resources, user management are all quite ripe, are one and are applicable to the huge resource of carrying out transfer of data.For cable television network is used for data communication, people had thought many ways, as CMTS+Cable Modem system, were the two-way data communication systems of the used cover comparative maturity of the U.S..Its operation principle be data signal modulation on specific channel, share circuit with the broadcasting of cable TV stream, it and broadcast singal are adjacent relations, so its available in theory bandwidth " extruding " from television channel comes out, and are subjected to more restriction.And different frequency ranges is taked in its up-downgoing, is asymmetric thereby cause transmission, and as the used commercial system of the U.S., up-downgoing speed all can not satisfy the application of broadband data communication.Characteristics of this system are the head ends that local side apparatus is placed on fiber optic network, need do the transformation of two-wayization on the circuit, and the required cost of dilatation is very big.
The applicant was once applying for one before this about utilizing existing cable TV network to carry out the patent of data communication, application number is 200610053043.1, the method of this application comprises two-way data communication equipment and network adapter, network adapter is installed in user terminal, two-way data communication equipment is installed on the distribution network node of cable television network, mixing/the separation module and the bandwidth detector that wherein also comprise broadcast singal/data-signal, bandwidth detector detects the sub-band of not using in the available bandwidth of cable of cable TV distribution network automatically, uses it for two-way data communication;
At down direction, data-signal is converted on the sub-band of aforementioned not usefulness at the two-way data communication equipment that is arranged in the distribution network node, mix with broadcast singal then, mixed signal is transferred to the network adapter that is positioned at user terminal by cable television distribution network.Network adapter is identified for the channel that data are passed on automatically, more described mixed signal is separated into broadcast singal and data-signal, and converts data traffic signals to packet, sends to the data processing equipment of user terminal;
At up direction, the network adapter of user terminal is utilized and aforesaidly with sub-band data traffic signals is not sent to the two-way data communication equipment that is positioned at the distribution network node, then these packets is sent to the corresponding network device destination by data communication apparatus.
This method has been utilized existing Internet resources preferably, and the up-downgoing data channel is symmetrical, does not disturb mutually, and bandwidth is wide, can satisfy the requirement of broadband application.In some actual cable TV networks, because its coverage distance is often far,, when construction network, be equiped with amplifier usually in the line for avoiding signal attenuation, be used to strengthen broadcast singal.And this amplifier can't be when the data needed two-way signaling, therefore for realizing the telecommunication of whole network, on the basis of the method and apparatus of above-mentioned both-way communication, do further to extend.
Summary of the invention
The purpose of this invention is to provide a kind of can be with amplifier coexistence, utilize cable television network to carry out the method for remote both way communications.
Another object of the present invention is to use this method, and a kind of device that utilizes cable television network to carry out remote both way communications is provided.
For realizing first purpose of the present invention, the technical scheme that is adopted is such: utilize cable television network to carry out the method for both-way communication, comprise two-way data communication equipment and network adapter, network adapter is installed in user terminal, two-way data communication equipment is installed on the distribution network node of cable television network, mixing/the separation module and the bandwidth detector that wherein also comprise broadcast singal/data-signal, bandwidth detector detects the sub-band of not using in the available bandwidth of cable of cable TV distribution network automatically, uses it for two-way data communication;
At down direction, data-signal is converted on the sub-band of aforementioned not usefulness at the two-way data communication equipment that is arranged in the distribution network node, mix with broadcast singal then, mixed signal is transferred to the network adapter that is positioned at user terminal by cable television distribution network.Network adapter is identified for the channel that data are passed on automatically, more described mixed signal is separated into broadcast singal and data-signal, and converts data traffic signals to packet, sends to the data processing equipment of user terminal;
At up direction, the network adapter of user terminal is utilized and aforesaidly with sub-band data traffic signals is not sent to the two-way data communication equipment that is positioned at the distribution network node, then these packets is sent to the corresponding network device destination by data communication apparatus;
It is characterized in that: between two-way data communication equipment and network adapter, both-way trunk is installed, described both-way trunk comprises two adjustable multiplexers and a two-way signaling adjusting device, two adjustable multiplexers are in the two ends of repeater, be connected with the two-way signaling adjusting device respectively, and with network on original amplifier and connecing; When mixed signal arrives repeater, at first the adjustable multiplexer by front end is decomposed into data-signal and broadcast singal with it, broadcast singal arrives the adjustable multiplexer of rear end after original amplifier amplifies, data-signal arrives the adjustable multiplexer of rear end after the two-way signaling adjusting device is amplified, mix the back again with broadcast singal again and continue transmission.
Further, the two-way signaling adjusting device can be to be made of two modulator-demodulators and two frequency converters, position relation by adjustable multiplexer-frequency converter-modulator-demodulator-modulator-demodulator-frequency converter-adjustable multiplexer realizes being electrically connected the transmission of the line data signal of going forward side by side; Modulator-demodulator transmits control signal to frequency converter approaching with it and adjustable multiplexer simultaneously.
Two-way data communication equipment can be installed on the arbitrary node of cable of cable TV distribution network; One group of two-way data communication equipment is corresponding to a plurality of network adapter that are installed in user terminal.
Further, network adapter is by the dedicated channel that detects or the message mechanism specified data is communicated by letter.At receiving terminal, network adapter is separated mixed signal, thereby produces cable tv broadcast signal and data traffic signals, and converts data traffic signals to packet.At transmitting terminal, network adapter utilizes one or more data channels to carry out transmitting uplink data.
In mixed process, broadcast singal and data-signal are respectively through mixed behind the variable band-pass filter of different settings; In separation process, be separated into broadcast singal and data-signal behind the variable band-pass filters of mixed signal through two different settings;
Bandwidth detector is by carrying out the analyzing and processing that frequency scanning, energy measuring and thresholding are determined to the cable tv broadcast signal; as find that the bandwidth ratio data channel of blank subband and both sides boundary belt sum thereof are wide, then select this sub-band to be used to transmit mixed signal.
The information that is used for data transmission channel is sent to network interface adapter by pilot channel, wherein, pilot signal in pilot channel uses the spread spectrum mode to implement to transmit, comprise direct sequence spread spectrum or frequency-hopping spread spectrum spread spectrum, or transmit by a fixing pilot channel that outside cable television spectrum, is provided with.
Network interface adapter detects data transmission channel voluntarily, and wherein, two-way data communication equipment periodically transmits an index signal by the data channel that has defined, so that network adapter is sought data channel and carried out time and Frequency Synchronization; Network adapter detects index signal in the usable subband one by one by the frequency that changes adjustable multiplexer.
Data-signal be converted to aforementioned not with or the sub-band of appointment on transmit, wherein, the modulated demodulator of frequency synthesizer is controlled and is produced a certain characteristic frequency; The information of relevant watt level is fed back in the modulator-demodulator in the transmission link, and modulator-demodulator then adjusts its output in view of the above so that the power output of frequency converter maintains a certain scope; And the time division duplex switch is controlled by modulator-demodulator.
Repeater can be used regeneration type and repeat type.The regeneration type repeater is the data-signal decoding that receives from two-way data communication equipment (or network adapter) and form packet, to two-way data communication equipment (or network adapter) passback answer signal, then packet is converted to the network adapter (or two-way data communication equipment) of data to appointment again.Correctly receive packet when this network adapter (or two-way data communication equipment), it also can return an answer signal to repeater.(for example amplifying or filtering) directly regulated, remedies or repaired to the repeat type repeater from the radio-frequency (RF) data signal that two-way data communication equipment (or network adapter) receives, and then the radio-frequency (RF) data signal that regulates transferred out.Under the fully high situation of the quality of radio-frequency (RF) data signal, the Signal Regulation step can be saved.
The information that is used for data transmission channel is sent to repeater by pilot channel by two-way data communication equipment, wherein, pilot signal in pilot channel uses the spread spectrum mode to implement to transmit, comprise direct sequence spread spectrum or frequency-hopping spread spectrum spread spectrum, or transmit by a fixing pilot channel that outside cable television spectrum, is provided with.
Repeater detects data transmission channel voluntarily, and wherein, two-way data communication equipment periodically transmits an index signal by the data channel that has defined, so that repeater is sought data channel and carried out time and Frequency Synchronization; Repeater detects index signal in the usable subband one by one by the frequency that changes adjustable multiplexer.
Repeater and network adapter or and next repeater between transmission, used channel can be same as be used for described repeater and two-way data communication equipment or and a last repeater between channel transmitted, wherein said repeater can with the information that is used for data transmission channel that transmits from two-way data communication equipment or a last repeater with identical, similar or different modes directly (repetitions) or indirectly (regeneration) past network adapter or with next repeater biography.Repeater and network adapter or and next repeater between transmission, used channel also can be inequality in be used for described repeater and two-way data communication equipment or and a last repeater between channel transmitted, obtain indication in the information that is used for data transmission channel that wherein used channel can transmit from two-way data communication equipment or a last repeater, or by described repeater specified data channel voluntarily, or the data channel that has defined, and the information that will be used for data transmission channel passes toward network adapter or with next repeater in above-mentioned a certain mode.
At transmitting terminal, when initial data packets will pass, two-way data communication equipment (or network adapter) at first converted thereof into the form of transmits data packets, then described transmits data packets was converted to the radio-frequency (RF) data signal transmission.This process is called packing.At receiving terminal, two-way data communication equipment (or network adapter) at first radio-frequency (RF) data signal is converted to transmits data packets, then described transmits data packets is converted to initial data packets.This process is called unpacks.
If enable the regeneration type repeater, will utilize the network packet trunk protocol.The detailed process that this agreement is used to define the form of transmits data packets and packing and unpacks.The network packet trunk protocol transmits the carrying data of initial data packets as transmits data packets after packet header of inserting transmits data packets and check code.Perhaps, initial data packets is at first handled the carrying data be re-used as transmits data packets through overcompression and is transmitted.The check code of transmits data packets can be reused the check code field of initial data packets, but the check code value will begin to recomputate from the transmits data packets head.Moreover initial data packets at first is divided into a plurality of data cells, and each data cell is transmitted as the carrying data of a transmits data packets.At receiving terminal, data cell is reassembled into initial data packets.The form of transmits data packets adopts existing industrial standard, for example the WDS packaged type of IP Tunnel packaged type or IEEE 802.11.The transmits data packets head comprises contents such as sending network appliance address field, reception network appliance address field, data packet length field, data priority field and burst indication field.The network appliance address field is used to identify a certain two-way data communication equipment, repeater or network adapter.The data packet length field is used to indicate the length of transmits data packets.The data priority field is represented the priority that initial data packets is transmitted in cable television network.The burst indication field is used to indicate the burst type, as initial burst, middle burst or last burst, so that receiving terminal carries out the initial data packets assembling.
For realizing second goal of the invention, the technical scheme that is adopted is such: utilize cable television network to carry out the device of both-way communication, comprise cable television distribution network, on the distribution network node of cable television network, two-way data communication equipment is installed, it is connected with service provider's core network on the one hand, be connected with cable television distribution network by coaxial cable or All other routes on the other hand, which comprises at least a modulator-demodulator, a bandwidth detector, a frequency converter and an adjustable multiplexer, modulator-demodulator is connected to core network, and be connected with adjustable multiplexer by frequency converter, realize the transmitted in both directions of data-signal thus; On the other hand, bandwidth detector detects the broadcast singal of cable television distribution network, is connected with modulator-demodulator simultaneously, and to its transmission channel information, modulator-demodulator also links to each other with adjustable multiplexer with frequency converter, transmits control signal to them; Adjustable multiplexer receives the broadcast singal from cable television distribution network simultaneously, and it is mixed with data-signal from frequency converter;
At user terminal network adapter is installed, which comprises at least a modulator-demodulator, a frequency converter and an adjustable multiplexer, adjustable multiplexer receives the signal of automatic network, the television terminal that connects the user on the one hand, be used to teleview, connect user's data equipment by frequency converter, modulator-demodulator on the other hand, realize the transmitted in both directions of data-signal; Modulator-demodulator is connected with adjustable multiplexer simultaneously, transmits control signal;
It is characterized in that: between two-way data communication equipment and network adapter, both-way trunk is installed, described both-way trunk comprises two adjustable multiplexers and a two-way signaling adjusting device, two adjustable multiplexers are in the two ends of repeater, be connected with the two-way signaling adjusting device respectively, and with network on original amplifier and connecing; When mixed signal arrives repeater, at first the adjustable multiplexer by front end is decomposed into data-signal and broadcast singal with it, broadcast singal arrives the adjustable multiplexer of rear end after original amplifier amplifies, data-signal arrives the adjustable multiplexer of rear end after the two-way signaling adjusting device is amplified, mix the back again with broadcast singal again and continue transmission.
Further, the two-way signaling adjusting device can be to be made of two modulator-demodulators and two frequency converters, position relation by adjustable multiplexer-frequency converter-modulator-demodulator-modulator-demodulator-frequency converter-adjustable multiplexer realizes being electrically connected the transmission of the line data signal of going forward side by side; Modulator-demodulator transmits control signal to frequency converter approaching with it and adjustable multiplexer simultaneously.
Repeater can be used regeneration type and repeat type.The regeneration type repeater comprises at least two modulator-demodulators, two frequency converters and two adjustable multiplexers, realizes the two-way relay transmission of data-signal; Wherein modulator-demodulator is connected to network by frequency converter and adjustable multiplexer on the one hand, and modulator-demodulator arrives another modulator-demodulator by certain connection (for example Ethernet) on the other hand.Adjustable multiplexer receives the mixed signal of automatic network or is transferred to the mixed signal of network, connects the broadcast singal amplifier on the one hand, connects modulator-demodulator by frequency converter on the other hand.
The repeat type repeater comprises at least one two-way signaling adjuster and two adjustable multiplexers, realizes the two-way relay transmission of data-signal; Wherein each end of two-way signaling adjuster respectively is connected to network by an adjustable multiplexer.
Described adjustable multiplexer is made up of at least two variable band-pass filters, filter is controlled by frequency control signal by modulator-demodulator, wherein at least one is opened cable TV signal and radio-frequency (RF) data signal is sealed, and at least one seals cable TV signal the rf data signal at clear.
Described frequency converter is at least by wave filter, amplifier, and frequency mixer, compound interchanger or composite filter, and frequency synthesizer forms, wherein, frequency synthesizer and time division duplex switch are controlled by modulator-demodulator; The power output size is fed back in the modulator-demodulator by feedback line in the transmission link.
The two-way data communication equipment on the distribution network node of being installed in comprises the multichannel ethernet transceiver, organizes modulator-demodulator more, bandwidth detector, frequency converter and adjustable multiplexer, modulator-demodulator in each group is connected with the multichannel ethernet transceiver respectively, carry out bidirectional data communication, thereby constitute the mixing/separation equipment of multichannel.
The two-way data communication equipment that is installed on the distribution network node also can comprise a modulator-demodulator, a bandwidth detector, a frequency converter, a distributor and a plurality of adjustable multiplexer, frequency converter is connected with a plurality of adjustable multiplexers by distributor, is extended to multichannel equipment.
The present invention has increased the two-way signaling adjusting device and original amplifier is used, with broadcast singal with amplify respectively after data-signal separates, make amplifier can not cause obstacle like this to mixed signal; Solve simultaneously the problem of signal attenuation in the transmission again, made the present invention can be used for long-range both-way communication, can realize goal of the invention.
Description of drawings
Fig. 1 is a schematic flow sheet of the present invention.
Fig. 2 is the embodiment of a repeater.
Fig. 3 is the embodiment of another repeater.
Fig. 4 is a transmission trunking schematic diagram.
Fig. 5 is a transmits data packets example.
Embodiment
Referring to Fig. 1.Two-way data communication equipment 3 of the present invention is installed on the distribution network node of cable television network, it is connected with cable television network 1 on the one hand, be connected with service supply network 2 on the other hand, service provision network 2 is by network management server 21, SNTP server 22, ftp server 23, Vod server 24, Web server 25, e-mail service device 26, aaa server 27 compositions such as grade; The data-signal of the signal of cable television network and service supply network is after two-way data communication equipment place is mixed, send in the user family by cable television distribution network, the network adapter 4 that is installed in the user family is separated into broadcast singal and data-signal with mixed signal, broadcast singal sends to television set 5, or sending to television set 5 through set-top box 51, data-signal sends to computer 6.
Referring to Fig. 2.This is a repeat type repeater, and it is made up of adjustable multiplexer 74 and two-way signaling adjuster 75.Adjustable multiplexer is decomposed into broadcast singal 72 and data-signal 71 with mixed signal 70, broadcast singal 72 amplifies through original amplifier 73,75 in two-way signaling adjuster is directly regulated the data-signal 71 that receives, remedies or is repaired, and then the data that regulates is gone out.When network adapter when two-way data communication equipment send data, also can carry out similar program.Under the fully high situation of the quality of radio-frequency (RF) data signal, the two-way signaling adjuster can save and directly two adjustable multiplexers be connected together with radio frequency cable.
Referring to Fig. 3.This is a regeneration type repeater, and it is made up of adjustable multiplexer 74 and two-way signaling adjuster 75, and wherein two-way signaling adjuster 75 comprises two frequency converters 76 and two modulator-demodulators 77 again.Adjustable multiplexer is decomposed into broadcast singal 72 and data-signal 71 with mixed signal 70, broadcast singal 72 amplifies through original amplifier 73,71 of data-signals are decoded by the modulator-demodulator A in the repeater and are formed packet, and connect by Ethernet and to give modulator-demodulator B in the repeater data packet delivery.Modulator-demodulator B converts packet to data-signal again to be mixed with broadcast singal once more by adjustable multiplexer, is transferred to the network adapter of appointment again.When network adapter is correctly received packet, it also can return an answer signal to repeater.When network adapter when two-way data communication equipment send data, also can carry out similar program.
Referring to Fig. 4.Two-way data communication equipment and network adapter are with the form of network packet trunk protocol definition transmits data packets and packing and the detailed process of unpacking.Two-way data communication
Equipment and network adapter are transmitted after packet header of inserting transmits data packets and check code 81 with the carrying data of initial data packets 80 as transmits data packets.
Referring to Fig. 5.The transmits data packets head comprises contents such as sending network appliance address field, reception network appliance address field, data packet length field, data priority field and burst indication field.The network appliance address field is used to identify a certain two-way data communication equipment, repeater or network adapter.The data packet length field is used to indicate the length of transmits data packets.The data priority field is represented the priority that initial data packets is transmitted in cable television network.The burst indication field is used to indicate the burst type, as initial burst, middle burst or last burst, so that receiving terminal carries out the initial data packets assembling.
Claims (15)
1. utilize cable television network to carry out the method for both-way communication, comprise two-way data communication equipment and network adapter, network adapter is installed in user terminal, two-way data communication equipment is installed on the distribution network node of cable television network, mixing/the separation module and the bandwidth detector that wherein also comprise broadcast singal/data-signal, bandwidth detector detects the sub-band of not using in the available bandwidth of cable of cable TV distribution network automatically, uses it for two-way data communication;
At down direction, data-signal is converted on the sub-band of aforementioned not usefulness at the two-way data communication equipment that is arranged in the distribution network node, mix with broadcast singal then, mixed signal is transferred to the network adapter that is positioned at user terminal by cable television distribution network.Network adapter is identified for the channel that data are passed on automatically, more described mixed signal is separated into broadcast singal and data-signal, and converts data traffic signals to packet, sends to the data processing equipment of user terminal;
At up direction, the network adapter of user terminal is utilized and aforesaidly with sub-band data traffic signals is not sent to the two-way data communication equipment that is positioned at the distribution network node, then these packets is sent to the corresponding network device destination by data communication apparatus;
It is characterized in that: between two-way data communication equipment and network adapter, both-way trunk is installed, described both-way trunk comprises two adjustable multiplexers and a two-way signaling adjusting device, two adjustable multiplexers are in the two ends of repeater, be connected with the two-way signaling adjusting device respectively, and with network on original amplifier and connecing; When mixed signal arrives repeater, at first the adjustable multiplexer by front end is decomposed into data-signal and broadcast singal with it, broadcast singal arrives the adjustable multiplexer of rear end after original amplifier amplifies, data-signal arrives the adjustable multiplexer of rear end after the two-way signaling adjusting device is amplified, mix the back again with broadcast singal again and continue transmission.
2. the method for claim 1, it is characterized in that: repeater is the regeneration type repeater, data-signal decoding that receives from two-way data communication equipment (or network adapter) and formation packet, to two-way data communication equipment (or network adapter) passback answer signal, then packet is converted to the network adapter (or two-way data communication equipment) of data to appointment again.
3. the method for claim 1, it is characterized in that: repeater is for repeating type repeater, the radio-frequency (RF) data signal that receives from two-way data communication equipment (or network adapter) is directly regulated, remedied or repairs, then the radio-frequency (RF) data signal that regulates is transferred out.
4. as claim 2 or 3 described methods, it is characterized in that: the information that is used for data transmission channel is sent to repeater or network interface adapter by pilot channel, wherein, the target pilot signal uses the spread spectrum mode to implement to transmit in pilot channel, comprise connecing sequence spread spectrum or frequency-hopping spread spectrum spread spectrum, or transmit by a fixing pilot channel that outside cable television spectrum, is provided with.
5. method as claimed in claim 4, it is characterized in that: repeater or network interface adapter detect data transmission channel voluntarily, wherein, two-way data communication equipment periodically transmits an index signal by the data channel that has defined, so that repeater or network adapter are sought data channel and carried out time and Frequency Synchronization; Repeater or network adapter detect index signal in the usable subband one by one by the frequency that changes adjustable multiplexer.
6. method as claimed in claim 5 is characterized in that: data-signal be converted to aforementioned not with or the sub-band of appointment on transmit, wherein, the modulated demodulator of frequency synthesizer is controlled and is produced a certain characteristic frequency; The information of relevant watt level is fed back in the modulator-demodulator in the transmission link, and modulator-demodulator then adjusts its output in view of the above so that the power output of frequency converter maintains a certain scope; And the time division duplex switch is controlled by modulator-demodulator.
7. as claim 2 or 3 described methods, it is characterized in that: repeater and network adapter or and next repeater between transmission, used channel be same as be used for described repeater and two-way data communication equipment or and a last repeater between channel transmitted, wherein said repeater can repeat the information that is used for data transmission channel that transmits from two-way data communication equipment or a last repeater or regenerate to pass toward network adapter or with next repeater in identical, similar or different modes.
8. as claim 2 or 3 described methods, it is characterized in that: repeater and network adapter or and next repeater between transmission, used channel also can be inequality in be used for described repeater and two-way data communication equipment or and a last repeater between channel transmitted, obtain indication in the information that is used for data transmission channel that wherein used channel can transmit from two-way data communication equipment or a last repeater, or by described repeater specified data channel voluntarily, or the data channel that has defined, and the information that will be used for data transmission channel passes toward network adapter or with next repeater in above-mentioned a certain mode.
9. utilize cable television network to carry out the device of both-way communication, comprise cable television distribution network, on the distribution network node of cable television network, two-way data communication equipment is installed, it is connected with service provider's core network on the one hand, be connected with cable television distribution network by coaxial cable or All other routes on the other hand, which comprises at least a modulator-demodulator, a bandwidth detector, a frequency converter and an adjustable multiplexer, modulator-demodulator is connected to core network, and be connected with adjustable multiplexer by frequency converter, realize the transmitted in both directions of data-signal thus; On the other hand, bandwidth detector detects the broadcast singal of cable television distribution network, is connected with modulator-demodulator simultaneously, and to its transmission channel information, modulator-demodulator also links to each other with adjustable multiplexer with frequency converter, transmits control signal to them; Adjustable multiplexer receives the broadcast singal from cable television distribution network simultaneously, and it is mixed with data-signal from frequency converter;
At user terminal network adapter is installed, which comprises at least a modulator-demodulator, a frequency converter and an adjustable multiplexer, adjustable multiplexer receives the signal of automatic network, the television terminal that connects the user on the one hand, be used to teleview, connect user's data equipment by frequency converter, modulator-demodulator on the other hand, realize the transmitted in both directions of data-signal; Modulator-demodulator is connected with adjustable multiplexer simultaneously, transmits control signal;
It is characterized in that: between two-way data communication equipment and network adapter, both-way trunk is installed, described both-way trunk comprises two adjustable multiplexers and a two-way signaling adjusting device, two adjustable multiplexers are in the two ends of repeater, be connected with the two-way signaling adjusting device respectively, and with network on original amplifier and connecing; When mixed signal arrives repeater, at first the adjustable multiplexer by front end is decomposed into data-signal and broadcast singal with it, broadcast singal arrives the adjustable multiplexer of rear end after original amplifier amplifies, data-signal arrives the adjustable multiplexer of rear end after the two-way signaling adjusting device is amplified, mix the back again with broadcast singal again and continue transmission.
10. device as claimed in claim 9 is characterized in that: described both-way trunk comprises at least two modulator-demodulators, two frequency converters and two adjustable multiplexers for the regeneration type repeater, realizes the two-way relay transmission of data-signal; Wherein modulator-demodulator is connected to network by frequency converter and adjustable multiplexer on the one hand, and modulator-demodulator is connected to another modulator-demodulator on the other hand; Adjustable multiplexer receives the mixed signal of automatic network or is transferred to the mixed signal of network, connects the broadcast singal amplifier on the one hand, connects modulator-demodulator by frequency converter on the other hand.
11. device as claimed in claim 9 is characterized in that: described both-way trunk comprises at least one two-way signaling adjuster and two adjustable multiplexers for repeating type repeater, realizes the two-way relay transmission of data-signal; Wherein each end of two-way signaling adjuster respectively is connected to network by an adjustable multiplexer.
12. as claim 10 or 11 described devices, it is characterized in that: described adjustable multiplexer is made up of at least two variable band-pass filters, filter is controlled by frequency control signal by modulator-demodulator, wherein at least one is opened cable TV signal and radio-frequency (RF) data signal is sealed, and at least one seals cable TV signal the rf data signal at clear.
13. as claim 10 or 11 described devices, it is characterized in that: described frequency converter is at least by wave filter, amplifier, frequency mixer, compound interchanger or composite filter, and frequency synthesizer is formed, wherein, frequency synthesizer and time division duplex switch are controlled by modulator-demodulator; The power output size is fed back in the modulator-demodulator by feedback line in the transmission link.
14. as claim 10 or 11 described devices, it is characterized in that: the two-way data communication equipment on the distribution network node of being installed in comprises the multichannel ethernet transceiver, organizes modulator-demodulator more, bandwidth detector, frequency converter and adjustable multiplexer, modulator-demodulator in each group is connected with the multichannel ethernet transceiver respectively, carry out bidirectional data communication, thereby constitute the mixing/separation equipment of multichannel.
15. as claim 10 or 11 described devices, it is characterized in that: the two-way data communication equipment that is installed on the distribution network node comprises a modulator-demodulator, a bandwidth detector, a frequency converter, a distributor, with a plurality of adjustable multiplexers, frequency converter is connected with a plurality of adjustable multiplexers by distributor, is extended to multichannel equipment.
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| CNB2006101555898A CN100539677C (en) | 2006-12-29 | 2006-12-29 | Utilize cable television network to carry out the method and apparatus of remote both way communications |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102257733A (en) * | 2008-10-16 | 2011-11-23 | 约翰·梅扎林瓜联合有限公司 | Bandwidth conditioning device |
| CN102938743A (en) * | 2012-10-23 | 2013-02-20 | 国家广播电影电视总局广播科学研究院 | Data transmission method and device |
| US8832767B2 (en) | 2008-10-16 | 2014-09-09 | Ppc Broadband, Inc. | Dynamically configurable frequency band selection device between CATV distribution system and CATV user |
| CN106850143A (en) * | 2013-11-04 | 2017-06-13 | 上海数字电视国家工程研究中心有限公司 | The method for packing and method of calibration of packet |
| CN106888503A (en) * | 2017-03-29 | 2017-06-23 | 武汉米风通信技术有限公司 | A kind of broadcasting and TV frequency spectrum ultra-narrow band Internet of Things time calibrating method and system |
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| US10264325B2 (en) | 2008-10-16 | 2019-04-16 | Ppc Broadband, Inc. | System, method and device having teaching and commerce subsystems |
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| CN102938743A (en) * | 2012-10-23 | 2013-02-20 | 国家广播电影电视总局广播科学研究院 | Data transmission method and device |
| CN102938743B (en) * | 2012-10-23 | 2016-06-15 | 国家广播电影电视总局广播科学研究院 | Data transmission method and device |
| CN106850143A (en) * | 2013-11-04 | 2017-06-13 | 上海数字电视国家工程研究中心有限公司 | The method for packing and method of calibration of packet |
| CN106850143B (en) * | 2013-11-04 | 2020-08-18 | 上海数字电视国家工程研究中心有限公司 | Data packet packaging method and verification method |
| CN106888503A (en) * | 2017-03-29 | 2017-06-23 | 武汉米风通信技术有限公司 | A kind of broadcasting and TV frequency spectrum ultra-narrow band Internet of Things time calibrating method and system |
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| CN100539677C (en) | 2009-09-09 |
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