CN1787519B - Apparatus for realizing data transmitting and data access system thereof - Google Patents
Apparatus for realizing data transmitting and data access system thereof Download PDFInfo
- Publication number
- CN1787519B CN1787519B CN 200410098424 CN200410098424A CN1787519B CN 1787519 B CN1787519 B CN 1787519B CN 200410098424 CN200410098424 CN 200410098424 CN 200410098424 A CN200410098424 A CN 200410098424A CN 1787519 B CN1787519 B CN 1787519B
- Authority
- CN
- China
- Prior art keywords
- data
- transmission
- signal
- transfer
- ethernet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Small-Scale Networks (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
This invention provides a device for realizing data transmission and a data access system including: applying Homeplug technology on a wire TV coaxial net, carrying out data conversion between data based on Ethernet protocol and Homeplug protocol to transmit the RF signals based on the Homeplug protocol in a coaxial cable, so that, the wire TV coaxial net can realize data access for the user end so as to provide a new method for connecting wire TV and data access to users.
Description
Technical field
The present invention relates to the digital television techniques in the field of network communication, be specifically related to data transmission device and connecting system in the digital television system.
Background technology
In the prior art, the data insertion system networking schematic diagram of realization data communication as shown in Figure 1 in HFC (hybrid fiber coax).
In Fig. 1, realize among the HFC that the data insertion system of data communication mainly comprises: CMTS (CableModem Termination System cable modem local side) equipment, upconverter, OSS (OperationSupport System webmaster/operations support systems) and CM (Cable Modem cable modem).
CMTS equipment is that the hfc plant data insert local side apparatus, is the connection device of the analog radio frequency network of data network and HFC, and its major function comprises: network data forwarding, protocol processes and rf modulations demodulation etc.
Upconverter is a cable television network wideband frequency conversion equipment, and the descending analog intermediate frequency signal that CMTS is exported transforms on the arbitrary television channel of cable TV.
OSS Server (webmaster/operations support systems server) provides the required various server supports of the equipment control of system and network and system's operation such as DHCP (Dynamic Host ConfigurationProtocol DHCP), TFTP (Trivial File Transfer Protocol TFTP), ToD (Time Of Day, server constantly), LOG servers such as (log servers).
CM connects HFC and user terminal, and its major function comprises: data forwarding, protocol processes and modulation etc. between HFC and user data network or the data equipment.
Present HFC data insertion system, owing to need carry out the transformation of two-way transmission capabilities to the existing coaxial cable net, so early stage the construction cost height, when rate into family is low, need carry out two-wayization transformation to all users, and, because the coaxial fitting quality requirement is higher, makes the follow-up maintenance workload big, thereby makes the single channel integrated cost higher; In addition, because there is the noise collection effect effect in this method, influenced the bandwidth and the performance of system, and its upstream bandwidth is narrower, when rate into family is higher, is unfavorable for the developing interactive video traffic, user satisfaction is low.
Summary of the invention
The invention provides a kind of device and data insertion system of realizing transfer of data, higher with the network rebuilding cost that the data insertion system of realizing data communication in HFC that overcomes prior art exists, as to safeguard inconvenience shortcoming.
For achieving the above object, technical scheme provided by the invention comprises:
A kind of device based on coaxial cable realization transfer of data comprises:
Transceiver module: be connected with the outside respectively by data signal line, coaxial cable, the data that external transmission is come based on Ethernet protocol, based on the radio signal transmission of Homeplug agreement to modular converter, simultaneously, the data that modular converter transmission is come based on Ethernet protocol, transfer to the outside by data signal line, coaxial cable respectively based on the radiofrequency signal of Homeplug agreement;
Modular converter: the data based on Ethernet protocol that the transmission of described transceiver module is come are converted to radio signal transmission based on the Homeplug agreement to described transceiver module, simultaneously, the radiofrequency signal based on the Homeplug agreement that the transmission of described transceiver module is come is converted to transfer of data based on Ethernet protocol to described transceiver module.
Described transceiver module further comprises:
Ethernet interface unit: be connected with outside by data signal line, described modular converter and the next data based on Ethernet protocol of external transmission are carried out exchanges data;
Frequency conversion and balanced unit: be connected with outside by coaxial cable, the radiofrequency signal based on the Homeplug agreement that described modular converter transmission comes is carried out transmitting by coaxial cable after the Frequency-variable Modulation according to predetermined frequency band, simultaneously, the radiofrequency signal based on the Homeplug agreement after the Frequency-variable Modulation that external transmission is come carries out transferring to modular converter after equilibrium, the frequency conversion demodulation.
Described modular converter comprises:
Ethernet crosspoint: the data of transmitting between connected transceiver module, the realization of Homeplug agreement and the MAC layer interface unit respectively based on Ethernet protocol are carried out packet switch/bag transmit;
The Homeplug agreement realizes and MAC layer interface unit: carry out data transaction and transmitting-receiving processing to what transmit between connected radio frequency interface unit, the Ethernet crosspoint respectively based on the data of Homeplug agreement with based on the data of Ethernet protocol;
Radio frequency interface unit: carry out conversion process based on the data of Homeplug agreement with based on the radiofrequency signal of Homeplug agreement to what transmit between connected Homeplug agreement realization and MAC layer interface unit, the transceiver module respectively.
Described Ethernet crosspoint is replaceable to be:
Ethernet Transmit-Receive Unit: be connected with described transceiver module, host CPU and Routing Protocol unit respectively, and receive and dispatch processing in the data of transmitting between according to Ethernet protocol under the control of host CPU and Routing Protocol unit based on Ethernet protocol to transceiver module, host CPU and Routing Protocol unit;
Host CPU and Routing Protocol unit: realize being connected with described Ethernet Transmit-Receive Unit, Homeplug agreement respectively with MAC layer interface unit, according to tentation data exchange and routing algorithm the data of transmitting between connected Ethernet Transmit-Receive Unit, the realization of Homeplug agreement and the MAC layer interface unit respectively based on Ethernet protocol are carried out packet switch/bag forwarding, simultaneously, monitoring is based on the operating state of other unit in the device of coaxial cable realization transfer of data, statistics, record traffic load, and according to network management protocol service parameter is managed.
Described device also comprises:
Radio frequency duplex mixing module: be connected with balanced unit with described frequency conversion, and be connected with outside by coaxial cable, the cable TV radiofrequency signal that radiofrequency signal and external transmission based on the Homeplug agreement after the Frequency-variable Modulation of described frequency conversion and balanced unit transmission are come is mixed, and transmit by coaxial cable, simultaneously, radiofrequency signal after the Frequency-variable Modulation that the reception external transmission is come based on the Homeplug agreement, and transfer to described frequency conversion and balanced unit.
A kind of data insertion system of realizing transfer of data comprises:
Signal gathering processing unit: be connected with metropolitan area network, metropolitan area network is transmitted the next extremely corresponding data insertion equipment of the transfer of data based on Ethernet protocol, simultaneously, transfer to metropolitan area network behind the convergence that the data insertion equipment transmission is next based on Ethernet protocol;
At least one data insertion equipment: promptly at least one realizes the device of transfer of data based on coaxial cable, the data based on Ethernet protocol that signal gathering processing unit transmission is come are converted to the radiofrequency signal based on the Homeplug agreement, and according to after the frequency band Frequency-variable Modulation of cable television network with the cable TV radiofrequency signal mixed transport of its reception to signal branch equipment, simultaneously, radiofrequency signal equilibrium after the Frequency-variable Modulation that described signal branch device transmission is next based on the Homeplug agreement, the frequency conversion demodulation, and be converted to data based on Ethernet protocol, transfer to the signal gathering processing unit;
At least one signal branch equipment: the hybrid radio frequency signal that the data insertion equipment transmission is come transfers to connected user terminal access device and video terminal respectively, simultaneously, after the Frequency-variable Modulation that user terminal access device transmission is come based on the radio signal transmission of Homeplug agreement to data insertion equipment;
At least one user terminal access device: promptly at least one realizes the device of transfer of data based on coaxial cable, the radiofrequency signal equilibrium based on the Homeplug agreement, frequency conversion demodulation after the Frequency-variable Modulation in the hybrid radio frequency signal that the signal branch device transmission is come also is converted to transfer of data based on Ethernet protocol to user terminal, simultaneously, the data based on Ethernet protocol that user terminal transmission is come are converted to the radiofrequency signal based on the Homeplug agreement, and transfer to signal branch equipment after the frequency band Frequency-variable Modulation according to cable television network.
Described signal gathering processing unit comprises:
Fiber optical transceiver: receive the light signal that metropolitan area network comes by Optical Fiber Transmission based on Ethernet protocol, and transfer to Ethernet switch, simultaneously, receive the data that the Ethernet switch transmission comes, and it is transmitted through the fiber to metropolitan area network based on Ethernet protocol;
Ethernet switch: fiber optical transceiver is transmitted the next extremely corresponding data insertion equipment data of the transfer of data based on Ethernet protocol, simultaneously, transfer to fiber optical transceiver behind the convergence that the data insertion equipment transmission is next based on Ethernet protocol;
Described signal gathering processing unit also comprises:
Optical receiver: the cable TV light signal that the transmission of cable television network sub-headend is come is converted to radio signal transmission to radio frequency amplifier;
Radio frequency amplifier: the radiofrequency signal amplification back that described optical receiver transmission is come transfers to each data insertion equipment by the cable TV distribution network.
Described user terminal comprises: computer, IP phone terminal, set-top box or personal digital assistant.
Description by technique scheme as can be known, device of the present invention is by carrying out data transaction based on the data of Ethernet protocol with between based on the data of Homeplug agreement, by will in coaxial net, transmitting based on the radiofrequency signal modulation back of Homeplug agreement, effectively avoided utilizing power line when data communication, the communication quality wave phenomenon that causes owing to reasons such as load, electrical noises; Make the present invention realize high-quality transfer of data, provide a kind of new approaches for realizing that by the cable TV coaxial net data insert by coaxial cable; Data insertion system of the present invention has effectively utilized existing coaxial net resource, the line that multiple business such as cable TV, data access are provided is to the family solution, this technical scheme has been avoided the transformation of a large amount of two-way transmission capabilities to existing cable television network equipment, has saved the improvement cost in network early stage; Because user terminal of the present invention can be connected with the user terminal access device by USB mouth or Ethernet interface etc., make that the follow-up maintenance workload is little, maintenance cost is low; The present invention adopts distributed networking, by being arranged at building, corridor, floor etc. respectively, a plurality of data insertion equipments locate, frequency by data insertion equipment, the modulation of user terminal access device, data access, effectively reduced the influence of influx noise, and distributed networking of the present invention has improved the effective bandwidth of single household upstream data service; Thereby realized improving the utilance of cable TV network resource by technical scheme of the present invention, reduced the catv net reform cost, reduced the single channel integrated cost, improved the purpose of user satisfaction.
Description of drawings
Fig. 1 is the data insertion system networking schematic diagram of realizing data communication in HFC of prior art;
Fig. 2 is the Homeplug connecting system networking schematic diagram of prior art;
Fig. 3 is a logic diagram 1 of realizing the device of transfer of data based on coaxial cable of the present invention;
Fig. 4 is a logic diagram 2 of realizing the device of transfer of data based on coaxial cable of the present invention;
Fig. 5 is a data insertion system networking schematic diagram of realizing transfer of data based on coaxial cable of the present invention.
Embodiment
Core of the present invention is: it is online that the Homeplug technology is applied to cable TV coaxial, by based on the data of Ethernet protocol with based on the data transaction between the data of Homeplug agreement, based on the data of Homeplug agreement and based on the conversion between the radiofrequency signal of Homeplug agreement, the Frequency-variable Modulation of radiofrequency signal, balanced, frequency conversion demodulating process make device of the present invention realize utilizing coaxial cable to carry out the purpose of transfer of data.And then provide a kind of wideband data connecting system of in cable television network, realizing data communication, this wideband data connecting system makes full use of existing cable TV coaxial net, with less network rebuilding cost, realized the solution of a line of multiple business such as cable TV, wideband data access to the family.
At first the Homeplug technology is simply introduced below, the Homeplug technology is utilized common power line building network, and the line data communication of going forward side by side also is referred to as PLC (Power Line Communication power line communication).The Homeplug technology is passed through the PLC device loads on the power line of transmission current with data, as long as there is the place of electricity that data are just arranged.
Owing to use the Homeplug technology to realize that data communication need not to lay the new network of registering one's residence in large scale, and need not long-time maintenance, therefore use the Homeplug technology to realize that data communication can realize that low cost, height cover, non-maintaining broadband access operation is served.
At present, main " the Homeplug Powerline Alliance Industry Specification 1.0 " specification that adopts realizes the PLC scheme.The bandwidth of operation of Homeplug equipment is generally 14Mbps, relatively is fit to average family and uses.
HPA is formulating the technical specification of follow-up Homeplug AV Version, the work bandwidth of Homeplug equipment has significantly and improves, reach 85Mbps and more than, and QoS (service quality) and HDTV (HDTV (High-Definition Television)) transmission demand are the directions that the Homeplug technology is made great efforts, and it will satisfy the bandwidth demand of family to media flow transmission gradually.
The networking schematic diagram of Homeplug data insertion system as shown in Figure 2.
The capital equipment of Homeplug data insertion system network comprises in Fig. 2: LANSWITCH (Ethernet switch), Homeplug Router (being operated in the Homeplug equipment of router pattern), HomeplugBridge (being operated in the Homeplug equipment of network bridge mode) and Power Strip (electric power plug socket) etc.Its networking model is comparatively simple, also very is convenient to expansion.
LANSWITCH has the uplink optical fiber interface, and be connected to the Internet network by trunk fiber, LANSWITCH also has more downlink Ethernet interface, is connected with Homeplug Router respectively, and the quantity between LANSWITCH and the Homeplug Router becomes convergence relation.
Homeplug Router is generally the cut-in convergent equipment of user open air, be used to realize the route bridging function between a PLC subnet and the external network, have power line modulation function, and use a special frequency channel, its physical layer Digital Transmission bandwidth can reach 14Mbps.
Homeplug Bridge is generally the indoor networking terminal node equipment of user, and its purposes and occupation mode are similar to Modem, and user terminal such as the PC etc. of Homeplug Bridge by netting twine cable too and user links to each other.Homeplug Bridge is the same with Homeplug Router also to have power line modulation function, and uses a special frequency channel, and its physical layer Digital Transmission bandwidth can reach 14Mbps.
Power Strip is the family expenses common apparatus, is generally the power supply interface of power consumption equipment, the interface equipment that transmits as the communication of Homeplug Bridge simultaneously in data insertion system.
The logic diagram 1 of the device of realizing transfer of data based on coaxial cable of the present invention as shown in Figure 3.
In Fig. 3, realize that based on coaxial cable the device of transfer of data mainly comprises: transceiver module 300 and modular converter 310.
The major function of transceiver module 300 is realized by Ethernet interface unit 301, frequency conversion and balanced unit 302.
The major function of modular converter 310 is realized by Ethernet crosspoint 311, the realization of Homeplug agreement and MAC layer interface unit 312, radio frequency interface unit 313.
The Homeplug agreement realizes and the major function of MAC layer interface unit 312 comprises: to carrying out data transaction and transmitting-receiving processing based on the data of Homeplug agreement with based on the data of Ethernet protocol between connected radio frequency interface unit 313 and the Ethernet exchanging unit 311 respectively; Be about to data based on Ethernet protocol that 311 transmission of Ethernet exchanging unit come and be converted to transfer of data based on the Homeplug agreement to radio frequency interface unit 313, the data based on the Homeplug agreement that 313 transmission of radio frequency interface unit are come are converted to transfer of data based on Ethernet protocol to Ethernet exchanging unit 311.
The major function of radio frequency interface unit 313 comprises: the Homeplug agreement that connects realizes and MAC layer interface unit 312, frequency conversion and balanced unit 302 respectively, finishes based on the data of Homeplug agreement and based on functions such as modulation processing between the radiofrequency signal of Homeplug agreement and radiofrequency signal gain controlling.Be about to the Homeplug agreement realizes and 312 transmission of MAC layer interface unit come data based on the Homeplug agreement and be converted to radio signal transmission based on the Homeplug agreement to frequency conversion and balanced unit 302, the radiofrequency signal based on the Homeplug agreement that frequency conversion and balanced unit 302 transmission are come is converted to transfer of data based on the Homeplug agreement to realization of Homeplug agreement and MAC layer interface unit 312.
The major function of frequency conversion and balanced unit 302 comprises: received RF interface unit 313 transmits the radiofrequency signal based on the Homeplug agreement of coming, and according to the band plan of cable television network the radiofrequency signal based on the Homeplug agreement is carried out Frequency-variable Modulation.Radiofrequency signal after the Frequency-variable Modulation is transferred to the outside by coaxial cable, simultaneously, after the radiofrequency signal based on the Homeplug agreement after the Frequency-variable Modulation that frequency conversion and balanced unit 302 come external transmission is carried out equilibrium, frequency conversion demodulation process, will be based on the radio signal transmission of Homeplug agreement to radio frequency interface unit 313.
In actual applications, this device is a kind of device of having simplified, and can effectively reduce the transfer of data cost.Ethernet crosspoint 311 in this device can be replaced into: Ethernet Transmit-Receive Unit and host CPU and Routing Protocol unit.Thereby realize the Equipment Management Function of some enhancings, as monitor the operating state of other each unit in this device, statistics, record traffic load, and according to network management protocol service parameter is managed etc.
Because the main at present transmission cable TV signal of the coaxial cable of cable television network, so, device of the present invention also should transmit cable TV signal when utilizing the coaxial cable transmission of data signals, so device of the present invention also comprises: radio frequency duplex mixing module.
Be described below in conjunction with 4 pairs of devices of radio frequency duplex mixing module, Ethernet Transmit-Receive Unit and host CPU and Routing Protocol unit that comprise of the present invention of accompanying drawing.
The logic diagram 2 of the device of realizing transfer of data based on coaxial cable of the present invention as shown in Figure 4.
In Fig. 4, realize that based on coaxial cable the device of transfer of data comprises: radio frequency duplex mixing module 400, Ethernet interface unit 401, Ethernet Transmit-Receive Unit 402, host CPU and Routing Protocol unit 403, Homeplug agreement realize and MAC layer interface unit 404, radio frequency interface unit 405, frequency conversion and balanced unit 406.
The major function of Ethernet interface unit 401 comprises: the data of transmitting between connected signal gathering processing unit, the Ethernet Transmit-Receive Unit 402 respectively based on Ethernet protocol are carried out data exchange processing.
The major function of Ethernet Transmit-Receive Unit 402 comprises: according to Ethernet protocol the data of transmitting between network interface unit 401, host CPU and the Routing Protocol unit 402 very much based on Ethernet protocol are being received and dispatched processing under the control of host CPU and Routing Protocol unit, be specially: receive the data that 401 transmission of Ethernet interface unit come based on Ethernet protocol, and transfer to host CPU and Routing Protocol unit 403, receive the data that host CPU and 403 transmission of Routing Protocol unit come, and transfer to Ethernet interface unit 401 based on Ethernet protocol.The major function that above-mentioned Ethernet Transmit-Receive Unit 402 is finished also usually is integrated in host CPU and the Routing Protocol unit 403 and realizes by software program, for ease of clear statement, still the two equivalence can be divided into two functional units on the logic diagram.
The major function of host CPU and Routing Protocol unit 403 comprises: according to the related exchange and the routing algorithm of data communication, Ethernet Transmit-Receive Unit 402 and Homeplug agreement realize and MAC layer interface unit 404 between finish second layer packet switch or the 3rd layer bag seek the footpath function.Simultaneously, the function of this unit also has, and the operating state of other unit of apparatus of the present invention is monitored and controls, and the service load state is carried out statistic record, carries out that service parameter reports and adjustment etc. according to network management protocol.
The Homeplug agreement realizes and the major function of MAC layer interface unit 404 comprises: handle finishing based on the data transmit-receive of Homeplug protocol data according to the Homeplug agreement under the control of host CPU and Routing Protocol unit 403 and between the radio frequency interface unit 405, and carry out the data transmit-receive processing by the ethernet link layer interface protocol between host CPU and the Routing Protocol unit 403.
Description in the major function of radio frequency interface unit 405 such as the accompanying drawing 3 is not described in detail at this.
The major function of frequency conversion and balanced unit 406 comprises: the radiofrequency signal based on the Homeplug agreement that 405 transmission of radio frequency interface unit come is carried out Frequency-variable Modulation according to the standard bands of cable television network in the coaxial cable, and with the radio signal transmission after the Frequency-variable Modulation to radio frequency duplex mixing module 400, the radiofrequency signal based on the Homeplug agreement after the Frequency-variable Modulation that 400 transmission of radio frequency duplex mixing module are come is carried out equilibrium, frequency conversion demodulation process, and with after balanced, the frequency conversion demodulation based on the radio signal transmission of Homeplug agreement to radio frequency interface unit 405.
Radio frequency duplex mixing module 400 is connected with outside by coaxial cable, its major function comprises: with mixing based on the radiofrequency signal of Homeplug agreement and the cable TV radiofrequency signal of its reception after the Frequency-variable Modulation of frequency conversion and balanced unit 406 transmission, and transfer to the outside by coaxial cable, simultaneously, after the Frequency-variable Modulation that the outside is come by coaxial cable transmission based on the radio signal transmission of Homeplug agreement to frequency conversion and balanced unit 406.
The networking schematic diagram of the wideband data connecting system of realizing data communication based on the Homeplug agreement in the cable TV coaxial net of the present invention as shown in Figure 5.
In Fig. 5, of the present inventionly realize that at cable television network the data insertion system of data communication comprises: signal gathering processing unit, at least one data insertion equipment, at least one signal branch equipment, at least one user terminal access device based on Homeplug.
With data insertion equipment is as shown in Figure 4 device, and user terminal access device device as shown in Figure 3 is an example, and wideband data connecting system of the present invention is elaborated.
The signal gathering processing unit is connected with the cable television network sub-headend of IP metropolitan area network, HFC (hybrid fiber/ coax, HFC) respectively, and the signal gathering processing unit mainly is made up of fiber optical transceiver, Ethernet switch, optical receiver, radio frequency amplifier.
Fiber optical transceiver is connected with Ethernet switch with the IP metropolitan area network respectively, and the data based on Ethernet between IP metropolitan area network and the Ethernet switch are received and dispatched processing by optical fiber.
Ethernet switch can be the standard switching equipment of Ethernet, its major function is: the data based on Ethernet that transmission comes to each data insertion equipment converge, and have that the ethernet standard switching equipment has usually its subordinate's subnet is carried out functions such as subnet division, subnet isolation.
Optical receiver is connected with radio frequency amplifier with the cable television network sub-headend of HFC respectively, and the major function of optical receiver is: the next cable TV light signal of cable television network sub-headend transmission of HFC is converted to radiofrequency signal, transfers to radio frequency amplifier.
After the radio frequency amplifier cable TV radiofrequency signal that transmission comes to optical receiver is amplified, transfer to cable television distribution network.
The signal gathering processing unit generally can be arranged at sub-district machine room etc. and locate.The signal gathering processing unit generally can corresponding a plurality of data insertion equipments.
Data insertion equipment is connected with Ethernet switch, radio frequency amplifier and signal branch equipment respectively.The general corresponding signal branch equipment of data access device, signal branch equipment usually can cascade to obtain more signal branch.Data insertion equipment is the routing module in the data insertion system of the present invention, its major function comprises: to carrying out data transaction based on the radiofrequency signal of Homeplug agreement with based on the data of Ethernet protocol such as the data of IEEE802.3 agreement after the Frequency-variable Modulation of its reception, and transmit, finishing the access of user terminal access device, and the user terminal access device is controlled, managed.
Though data insertion equipment adopts the related protocol of Homeplug, but no longer adopt power line mode to carry out transfer of data, but adopt coaxial cable system to carry out the radio signal transmission of Homeplug agreement, so, data insertion equipment is when transmitting based on the radiofrequency signal of Homeplug agreement, need standard bands according to the cable television network of coaxial cable, between 5MHz～1GHz, to carry out frequency conversion for after the radiofrequency signal of this frequency band based on the radiofrequency signal of Homeplug agreement, transfer to signal branch equipment by coaxial cable.After data insertion equipment receives radiofrequency signal after the Frequency-variable Modulation that the signal branch device transmission comes, should be with after its equilibrium, frequency conversion demodulation, being converted to data based on the Homeplug agreement, be converted to transfer of data based on Ethernet protocol again to Ethernet switch.
Data insertion equipment can be arranged at sub-district main line, corridor, floor of cable TV network etc. flexibly and locate.
Signal branch equipment is connected with data insertion equipment, user terminal access device, video terminal such as traditional tv etc. respectively.The corresponding data access device of signal branch equipment, signal branch equipment can corresponding a plurality of video terminals, the user terminal access device.
Signal branch equipment can be the branch equipment of standard in the cable television network, and main line, corridor, floor that can be arranged at cable TV network etc. located.
The major function of signal branch equipment comprises: the radiofrequency signal that the data insertion equipment transmission comes is shunted, transfer to connected user terminal access device and video terminal such as traditional tv etc. respectively, simultaneously, signal branch equipment transfers to connected data insertion equipment after the next radiofrequency signal of connected each user terminal access device transmission is converged.
The purposes and the occupation mode of user terminal access device are similar to Modem, generally can be arranged in the user family, ground such as office.The user terminal access device is connected with user terminal such as computer, set-top box etc. with signal branch equipment respectively, a user terminal access device can connect a plurality of user terminals, the user terminal access device provides interfaces such as USB mouth or Ethernet interface, make things convenient for the connection of user terminal, and make things convenient for follow-up maintenance work.
The major function of user terminal access device comprises: isolate the radiofrequency signal based on the Homeplug agreement after the Frequency-variable Modulation from the hybrid radio frequency signal that the signal branch device transmission is come, and with the radiofrequency signal after the Frequency-variable Modulation based on the Homeplug agreement carry out corresponding equilibrium, the mediation protocol conversion is separated in frequency conversion, be converted to data, and transfer to user terminal based on Ethernet protocol.Simultaneously, the user terminal access device also needs the data based on Ethernet protocol that user terminal transmission comes are converted to radiofrequency signal based on the Homeplug agreement, and according to the standard bands of the cable television network of coaxial cable to carrying out transferring to signal branch equipment by coaxial cable after the Frequency-variable Modulation based on the radiofrequency signal of Homeplug agreement.
Below by signal flow data insertion system of the present invention is described in detail.
The down direction of signal flow: by the IP metropolitan area network by Optical Fiber Transmission come based on data with big fidonetFido, at first transfer to the signal gathering processing unit, receive by the fiber optical transceiver of signal gathering processing unit, fiber optical transceiver will receive based on the transfer of data of Ethernet protocol to Ethernet switch.
Ethernet switch will be based on the extremely corresponding data insertion equipment of the transfer of data of Ethernet protocol.
The next cable TV light signal of cable television network sub-headend transmission by HFC, at first transfer to the signal gathering processing unit, optical receiver by the signal gathering processing unit receives, optical receiver transfers to radio frequency amplifier after the cable TV light signal that receives being converted to the radiofrequency signal of cable TV, and by radio frequency amplifier the radiofrequency signal of cable TV is amplified, transfer to all data insertion equipments that are connected with the signal gathering processing unit by cable television distribution network.
Data insertion equipment receives the data based on Ethernet protocol, the next cable TV radiofrequency signal of radio frequency amplifier transmission that the Ethernet switch transmission comes, data insertion equipment at first will be converted to the data based on the Homeplug agreement based on the data of Ethernet protocol, to be converted to radiofrequency signal again based on the data of Homeplug agreement based on the Homeplug agreement, then according to the standard bands of the cable television network of cable with its Frequency-variable Modulation after, mix with the cable TV radiofrequency signal, and transfer to the signal branch equipment of data insertion equipment correspondence by coaxial cable.
Signal branch equipment receiving data access device transmits the hybrid radio frequency signal of coming, and it is transferred to connected all video terminals and user terminal access device respectively.
The user terminal access device receives the hybrid radio frequency signal that the signal branch device transmission is come, radiofrequency signal from this hybrid radio frequency signal after the isolated Frequency-variable Modulation based on the Homeplug agreement, and the radiofrequency signal based on the Homeplug agreement after this Frequency-variable Modulation carried out equilibrium, frequency conversion demodulation, simultaneously the radiofrequency signal based on the Homeplug agreement after balanced, the frequency conversion demodulation is converted to based on the transfer of data of Ethernet protocol to user terminal such as computer, IP phone terminal, set-top box, personal digital assistant etc.
The up direction of signal flow:
User terminal will be based on the transfer of data of Ethernet protocol to connected user terminal access device.
The data based on Ethernet protocol that the user terminal access device comes the user terminal transmission are converted to the data based on the Homeplug agreement, be converted into radiofrequency signal based on the Homeplug agreement, and according to the band plan of cable television network with its Frequency-variable Modulation after, transfer to connected signal branch equipment by coaxial cable.
After the radiofrequency signal based on the Homeplug agreement after the Frequency-variable Modulation that signal branch equipment comes the transmission of each user terminal access device converges, transfer to data insertion equipment by coaxial cable.Radiofrequency signal after the Frequency-variable Modulation that the transmission of data insertion equipment received signal branch equipment comes based on the Homeplug agreement, and it is carried out equilibrium, frequency conversion demodulation, simultaneously the radiofrequency signal based on the Homeplug agreement after equilibrium, the frequency conversion demodulation is converted to data, transfers to Ethernet switch based on Ethernet protocol.
Ethernet switch converges the next data based on Ethernet protocol of each data insertion equipment transmission of its reception, and transfers to fiber optical transceiver.
Fiber optical transceiver is transmitted through the fiber to the IP metropolitan area network with the data based on Ethernet protocol that the Ethernet switch transmission comes.
Though described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, and the claim of application documents of the present invention comprises these distortion and variation.
Claims (10)
1. a device of realizing transfer of data is characterized in that, comprising: transceiver module and modular converter, wherein:
Transceiver module: be connected with the outside respectively by data signal line, coaxial cable, the data that external transmission is come based on Ethernet protocol, based on the radio signal transmission of Homeplug agreement to modular converter, simultaneously, the data that modular converter transmission is come based on Ethernet protocol, transfer to the outside by data signal line, coaxial cable respectively based on the radiofrequency signal of Homeplug agreement;
Modular converter: the data based on Ethernet protocol that the transmission of described transceiver module is come are converted to based on the radiofrequency signal of Homeplug agreement and transfer to described transceiver module, simultaneously, the radiofrequency signal based on the Homeplug agreement that the transmission of described transceiver module is come is converted to transfer of data based on Ethernet protocol to described transceiver module.
2. a kind of device of realizing transfer of data as claimed in claim 1 is characterized in that described transceiver module further comprises:
Ethernet interface unit: be connected with outside by data signal line, described modular converter and the next data based on Ethernet protocol of external transmission are carried out exchanges data;
Frequency conversion and balanced unit: be connected with outside by coaxial cable, the radiofrequency signal based on the Homeplug agreement that described modular converter transmission comes is carried out transmitting by coaxial cable after the Frequency-variable Modulation according to predetermined frequency band, simultaneously, the radiofrequency signal based on the Homeplug agreement after the Frequency-variable Modulation that external transmission is come carries out transferring to modular converter after equilibrium, the frequency conversion demodulation.
3. a kind of device of realizing transfer of data as claimed in claim 1 or 2 is characterized in that described modular converter comprises:
Ethernet crosspoint: the data of transmitting between connected transceiver module, the realization of Homeplug agreement and the MAC layer interface unit respectively based on Ethernet protocol are carried out packet switch/bag transmit;
The Homeplug agreement realizes and MAC layer interface unit: carry out data transaction and transmitting-receiving processing to what transmit between connected radio frequency interface unit, the Ethernet crosspoint respectively based on the data of Homeplug agreement with based on the data of Ethernet protocol;
Radio frequency interface unit: carry out conversion process based on the data of Homeplug agreement with based on the radiofrequency signal of Homeplug agreement to what transmit between connected Homeplug agreement realization and MAC layer interface unit, the transceiver module respectively.
4. a kind of device of realizing transfer of data as claimed in claim 3 is characterized in that, described Ethernet crosspoint is replaceable to be:
Ethernet Transmit-Receive Unit: be connected with described transceiver module, host CPU and Routing Protocol unit respectively, and receive and dispatch processing in the data of transmitting between according to Ethernet protocol under the control of host CPU and Routing Protocol unit based on Ethernet protocol to transceiver module, host CPU and Routing Protocol unit;
Host CPU and Routing Protocol unit: realize being connected with described Ethernet Transmit-Receive Unit, Homeplug agreement respectively with MAC layer interface unit, according to tentation data exchange and routing algorithm the data of transmitting between connected Ethernet Transmit-Receive Unit, the realization of Homeplug agreement and the MAC layer interface unit respectively based on Ethernet protocol are carried out packet switch/bag forwarding, simultaneously, monitoring is based on the operating state of other unit in the device of coaxial cable realization transfer of data, statistics, record traffic load, and according to network management protocol service parameter is managed.
5. a kind of device of realizing transfer of data as claimed in claim 4 is characterized in that described device also comprises:
Radio frequency duplex mixing module: be connected with balanced unit with described frequency conversion, and be connected with outside by coaxial cable, the cable TV radiofrequency signal that radiofrequency signal and external transmission based on the Homeplug agreement after the Frequency-variable Modulation of described frequency conversion and balanced unit transmission are come is mixed, and transmit by coaxial cable, simultaneously, radiofrequency signal after the Frequency-variable Modulation that the reception external transmission is come based on the Homeplug agreement, and transfer to described frequency conversion and balanced unit.
6. a kind of device of realizing transfer of data as claimed in claim 2 is characterized in that described device also comprises:
Radio frequency duplex mixing module: be connected with balanced unit with described frequency conversion, and be connected with outside by coaxial cable, the cable TV radiofrequency signal that radiofrequency signal and external transmission based on the Homeplug agreement after the Frequency-variable Modulation of described frequency conversion and balanced unit transmission are come is mixed, and transmit by coaxial cable, simultaneously, radiofrequency signal after the Frequency-variable Modulation that the reception external transmission is come based on the Homeplug agreement, and transfer to described frequency conversion and balanced unit.
7. a data insertion system of realizing data communication is characterized in that, comprising:
Signal gathering processing unit: be connected with metropolitan area network, metropolitan area network is transmitted the next extremely corresponding data insertion equipment of the transfer of data based on Ethernet protocol, simultaneously, transfer to metropolitan area network behind the convergence that the data insertion equipment transmission is next based on Ethernet protocol;
At least one data insertion equipment: promptly at least one realizes the device of transfer of data based on coaxial cable, the data based on Ethernet protocol that signal gathering processing unit transmission is come are converted to the radiofrequency signal based on the Homeplug agreement, and according to after the frequency band Frequency-variable Modulation of cable television network with the cable TV radiofrequency signal mixed transport of its reception to signal branch equipment, simultaneously, radiofrequency signal equilibrium after the Frequency-variable Modulation that described signal branch device transmission is next based on the Homeplug agreement, the frequency conversion demodulation, and be converted to data based on Ethernet protocol, transfer to the signal gathering processing unit;
At least one signal branch equipment: the hybrid radio frequency signal that the data insertion equipment transmission is come transfers to connected user terminal access device and video terminal respectively, simultaneously, after the Frequency-variable Modulation that user terminal access device transmission is come based on the radio signal transmission of Homeplug agreement to data insertion equipment;
At least one user terminal access device: promptly at least one realizes the device of transfer of data based on coaxial cable, the radiofrequency signal equilibrium based on the Homeplug agreement, frequency conversion demodulation after the Frequency-variable Modulation in the hybrid radio frequency signal that the signal branch device transmission is come also is converted to transfer of data based on Ethernet protocol to user terminal, simultaneously, the data based on Ethernet protocol that user terminal transmission is come are converted to the radiofrequency signal based on the Homeplug agreement, and transfer to signal branch equipment after the frequency band Frequency-variable Modulation according to cable television network.
8. a kind of data insertion system of realizing data communication as claimed in claim 7 is characterized in that, described signal gathering processing unit comprises:
Fiber optical transceiver: receive the light signal that metropolitan area network comes by Optical Fiber Transmission based on Ethernet protocol, and transfer to Ethernet switch, simultaneously, receive the data that the Ethernet switch transmission comes, and it is transmitted through the fiber to metropolitan area network based on Ethernet protocol;
Ethernet switch: fiber optical transceiver is transmitted the next extremely corresponding data insertion equipment data of the transfer of data based on Ethernet protocol, simultaneously, transfer to fiber optical transceiver behind the convergence that the data insertion equipment transmission is next based on Ethernet protocol;
9. a kind of data insertion system of realizing data communication as claimed in claim 8 is characterized in that, described signal gathering processing unit also comprises:
Optical receiver: the cable TV light signal that the transmission of cable television network sub-headend is come is converted to radio signal transmission to radio frequency amplifier;
Radio frequency amplifier: the radiofrequency signal amplification back that described optical receiver transmission is come transfers to each data insertion equipment by the cable TV distribution network.
10. a kind of as claimed in claim 8 or 9 data insertion system of realizing data communication is characterized in that described user terminal is: computer, IP phone terminal, set-top box or personal digital assistant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410098424 CN1787519B (en) | 2004-12-10 | 2004-12-10 | Apparatus for realizing data transmitting and data access system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410098424 CN1787519B (en) | 2004-12-10 | 2004-12-10 | Apparatus for realizing data transmitting and data access system thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1787519A CN1787519A (en) | 2006-06-14 |
| CN1787519B true CN1787519B (en) | 2010-04-21 |
Family
ID=36784822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410098424 Expired - Fee Related CN1787519B (en) | 2004-12-10 | 2004-12-10 | Apparatus for realizing data transmitting and data access system thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1787519B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101155036A (en) * | 2006-09-30 | 2008-04-02 | Thomson宽带研发（北京）有限公司 | Head end equipment of wired access network system |
| GB2446848A (en) * | 2007-01-12 | 2008-08-27 | Technetix Ltd | A filter for providing higher frequency information carrying signals on the same conductor as a lower frequency power carrying signal |
| CN102843601A (en) * | 2012-06-20 | 2012-12-26 | 华为终端有限公司 | Television signal converter |
| CN103634943B (en) * | 2012-08-20 | 2018-09-11 | 中兴通讯股份有限公司 | A kind of WiFi cut-in methods and device |
| CN103428214A (en) * | 2013-08-09 | 2013-12-04 | 无锡路通视信网络股份有限公司 | Multi-protocol implemented coaxial cable Ethernet bridge |
| CN104394046A (en) * | 2014-10-30 | 2015-03-04 | 成都康特电子高新科技有限责任公司 | Anti-line congestion bidirectional HFC (Hybrid Fiber Coaxial) based on broadcast television network |
| CN104394047A (en) * | 2014-10-30 | 2015-03-04 | 成都康特电子高新科技有限责任公司 | High-definition bidirectional HFC (Hybrid Fiber Coaxial) system based on broadcast television network |
| CN104539491A (en) * | 2014-10-30 | 2015-04-22 | 成都康特电子高新科技有限责任公司 | Bilateral HFC (Hybrid Fiber Coax) system based on broadcast television network |
| CN106160758B (en) * | 2016-08-25 | 2018-02-23 | 四川泰立科技股份有限公司 | Wireless non line of sight gigabit Ethernet Transmission system and its transmission method based on 700MHz 1100MHz variable frequencies |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2595095Y (en) * | 2003-01-15 | 2003-12-24 | 达锋科技股份有限公司 | Ethernet communication apparatus and bridge thereof |
| CN1505886A (en) * | 2001-04-26 | 2004-06-16 | ���dz� | Home networking gateway |
-
2004
- 2004-12-10 CN CN 200410098424 patent/CN1787519B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1505886A (en) * | 2001-04-26 | 2004-06-16 | ���dz� | Home networking gateway |
| CN2595095Y (en) * | 2003-01-15 | 2003-12-24 | 达锋科技股份有限公司 | Ethernet communication apparatus and bridge thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1787519A (en) | 2006-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7428238B2 (en) | Broadband network bridging various wiring channels | |
| WO2001080030A1 (en) | System and methods for home network communications | |
| CN104506228B (en) | A kind of WIFI application systems based on satellite communication | |
| CN100576813C (en) | Coaxle cable exchanging system and method | |
| CN101511043B (en) | Synthesis business networking method based on HFC broadband network, and synthesis business optical station equipment | |
| CN101242464A (en) | Wireless access forwarding device | |
| CN102437941B (en) | Ethernet passive optical network (EPON) optical network unit fusing Ethernet over coaxial cable (EoC) function | |
| CN1787519B (en) | Apparatus for realizing data transmitting and data access system thereof | |
| CN101808344A (en) | Ethernet passive electric network | |
| CN102300018B (en) | Television, broadband and telephone transmission system based on cable television HFC (Hybrid Fiber-Coaxial) network | |
| CN201210731Y (en) | Wireless access forwarding equipment | |
| CN101312403A (en) | High-speed coaxial digital access system | |
| CN201374788Y (en) | Integrated service light station | |
| JP3424660B2 (en) | Method of constructing TV reception, Internet connection and premises LAN system using existing TV common reception facilities | |
| CN100496115C (en) | System for implementing data communication based on cable television network | |
| CN200941630Y (en) | HFC net high frequency wide band access system | |
| CN202026322U (en) | Integrated broadband and narrowband cable television bilateral network | |
| US20060048203A1 (en) | Method and device for the bi-directional transmission of electronic data in a television data cable network | |
| CN103782548B (en) | A kind of mixting circuit, business device and mixing operation system | |
| CN200976597Y (en) | Coaxial cable switch system | |
| EP1695479B1 (en) | System for signals distribution to a plurality of users | |
| CN108282387A (en) | A kind of 10,000,000,000 coaxial access systems | |
| CN104378268A (en) | Integrated broadband access system fusing EPON and EOC | |
| CN204305054U (en) | Merge the integrated broadband access system of EPON and EOC | |
| CN106656687A (en) | Wireless access forwarding equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100421 Termination date: 20121210 |