CN202798700U - Wideband access transmission trunk equipment based on HomePlugAV technique - Google Patents
Wideband access transmission trunk equipment based on HomePlugAV technique Download PDFInfo
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- CN202798700U CN202798700U CN 201220383846 CN201220383846U CN202798700U CN 202798700 U CN202798700 U CN 202798700U CN 201220383846 CN201220383846 CN 201220383846 CN 201220383846 U CN201220383846 U CN 201220383846U CN 202798700 U CN202798700 U CN 202798700U
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Abstract
The utility model relates to a wideband access transmission trunk equipment based on HomePlugAV technique, which comprises a bidirectional filter for separating and mixing signals, a demodulator-modulator module for demodulation, restoration and regeneration of a downlink signal and modulation of an uplink signal, and a modulator-demodulator module for modulation of the downlink signal and demodulation, restoration and regeneration of the uplink signal, wherein one end of a first bidirectional filter is connected with an input port of trunk equipment; the other end of the first bidirectional filter is connected with the demodulator-modulator module; one end of a second bidirectional filter is connected with an output port of the trunk equipment; the other end of the second bidirectional filter is connected with the modulator-demodulator; the first bidirectional filter is further connected with the second bidirectional filter; and the demodulator-modulator module is connected with the modulator-demodulator module. The wideband access transmission trunk equipment based on the HomePlugAV technique has the advantages that: the trunk equipment performs modulation, demodulation and signal transformation to realize signal regeneration, therefore remote transmission is realized; and plug and play can be realized based on the original network, so the problem about bidirectional modification of intermediate-remote transmission and expansion in wired television is solved.
Description
Technical field
The utility model relates to a kind of broadband access transmission trunking equipment based on the HomePlugAV technology, belongs to broadcasting and TV broadband connections field.
Background technology
In radio, TV and film industries along with deepening continuously of Two-way Network transformation of hybred fiber-coax (Hybrid Fiber Coax:HFC) carried out.The cable access technology becomes one of key technology of building Next generation broadcasting network.Cable access technology (EoC) is based on coaxial cable, carries the technology of Ethernet service and other integrated services by various digital modulation techniques, realizes the consumer wideband access of Next generation broadcasting network.The cable access technology of main flow adopts based on the HomePlugAV scheme at present, utilize this technology to carry out cable TV network broadband, Two-way transformation, can effectively bring into play cable television network bandwidth, cost advantage low, that easily popularize, be conducive to cable TV network and build into huge numbers of families' multimedia information platform, satisfy many-sided demand of various circles of society's demand and numerous residents, further recommend the integration of three networks.
Adopt the HomeplugAV scheme to carry out Two-way Reconstruction in CATV Network, the place suitable with number of users in early days, this scheme technical advantage is very obvious.But by simple network reforming equipment plug and play.But the increase along with the deep and number of users of transforming exists the transformation bottleneck in some place.Exist the characteristics such as number of users is few, distance in remote small towns, because itself characteristic of EoC technology antidamping ability when distance is excessive descends, hang terminal quantity under the local side shortcomings such as certain limitation are arranged.Satisfy this part demand by changing on a large scale net, exist the problems such as construction cost height.
Summary of the invention
The purpose of this utility model is to solve the problem that present bilateral network transformation faces when long Distance Transmission or the transformation of remote small towns, a kind of broadband access transmission trunking equipment based on the HomePlugAV technology is provided, realize long Distance Transmission by broadband access transmission trunking principle, and can carry out dilatation to number of users.
According to the technical scheme that the utility model provides, described broadband access transmission trunking equipment based on the HomePlugAV technology comprises: for separating of with the first bidirectional filter of mixed signal and the second bidirectional filter, be used for downstream signal demodulation reducing/regenerating and upward signal modulation the demodulation modulation module, be used for the modulation /demodulation module of downstream signal modulation and upward signal demodulation reducing/regenerating; Described the first bidirectional filter one end connects the input port of trunking, the first bidirectional filter other end connects the demodulation modulation module, the second bidirectional filter one end connects the output port of trunking, the second bidirectional filter other end connects the modulation /demodulation module, the first bidirectional filter also is connected with the second bidirectional filter, and described demodulation modulation module is connected with the modulation /demodulation module.
Described demodulation modulation module comprises the first coupling circuit, the first AFE (analog front end) drive circuit, the first data link transceiver, the output of described the first coupling circuit connects the first AFE (analog front end) drive circuit by the first low pass filter, the output of the first AFE (analog front end) drive circuit connects the first data link transceiver by the second low pass filter, the output of the first data link transceiver connects the first AFE (analog front end) drive circuit, and the output of the first AFE (analog front end) drive circuit connects the first coupling circuit.
Described modulation /demodulation module comprises CPU management, the second data link transceiver, the second AFE (analog front end) drive circuit, the second coupling circuit, the output of described the second coupling circuit connects the second AFE (analog front end) drive circuit by the 3rd low pass filter, the output of the second AFE (analog front end) drive circuit connects the second data link transceiver by the 4th low pass filter, the output of the second data link transceiver connects the second AFE (analog front end) drive circuit, the output of the second AFE (analog front end) drive circuit connects the second coupling circuit, and described the second data link transceiver also is connected with CPU management.
Be connected by radio circuit or radio frequency cable between described the first bidirectional filter, the second bidirectional filter and demodulation modulation module, the modulation /demodulation module; Connect by the standard ethernet line between described demodulation modulation module and the modulation /demodulation module.
The utility model has the advantages that: the utility model but can effectively prolong the EoC transmission range take the EoC modulation technique as the basis.By modulation /demodulation and the signal reducing/regenerating to primary signal, thereby in the situation of guaranteed performance, realize long Distance Transmission and dilatation demand.But plug and play on the legacy network basis with respect to network being carried out extensive expensive transformation, can solve the difficult problem that broadcasting and TV face fast, cheaply by the utility model.
Description of drawings
Fig. 1 is the utility model overall circuit block diagram.
Fig. 2 is the topological diagram under the typical application scenarios of the present utility model.
Fig. 3 is the circuit structure diagram of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing and example the utility model is described further.
As shown in Figure 1, the designed trunking of the utility model comprises: the first bidirectional filter 301-1, the second bidirectional filter 301-2, demodulation modulation module 302, modulation /demodulation module 303; Wherein the first bidirectional filter 301-1, the second bidirectional filter 301-2 for separating of and mixed signal, be positioned at the input and output port of relaying; Demodulation modulation module 302 is used for downstream signal demodulation reducing/regenerating, the upward signal modulation; Modulation /demodulation module 303 is used for downstream signal modulation, upward signal demodulation reducing/regenerating.Described the first bidirectional filter 301-1 one end connects the input port of trunking, the first bidirectional filter 301-1 other end connects demodulation modulation module 302, the second bidirectional filter 301-2 one end connects the output port of trunking, the second bidirectional filter 301-2 other end connects modulation /demodulation module 303, the first bidirectional filter 301-1 also is connected with the second bidirectional filter 301-2, and described demodulation modulation module 302 is connected with modulation /demodulation module 303.
The first bidirectional filter 301-1, the second bidirectional filter 301-2 have the radiofrequency signal function of mixing 2 kinds of different frequency bands, have simultaneously the function that the mixed signal of input is separated.
Be connected by radio circuit or radio frequency cable between described the first bidirectional filter 301-1, the second bidirectional filter 301-2 and demodulation modulation module 302, the modulation /demodulation module 303; Connect by the standard ethernet line between described demodulation modulation module 302 and the modulation /demodulation module 303.
As shown in Figure 3, described demodulation modulation module 302 comprises the first coupling circuit 401-1, the first AFE (analog front end) drive circuit 402-1, the first data link transceiver (MAC/PHY) 403, and the IP downstream signal is advanced demodulation, and the IP upward signal is modulated.The output of described the first coupling circuit 401-1 connects the first AFE (analog front end) drive circuit 402-1 by the first low pass filter 404-1, the output of the first AFE (analog front end) drive circuit 402-1 connects the first data link transceiver 403 by the second low pass filter 404-2, the output of the first data link transceiver 403 connects the first AFE (analog front end) drive circuit 402-1, and the output of the first AFE (analog front end) drive circuit 402-1 connects the first coupling circuit 401-1.
Described modulation /demodulation module 303 comprises CPU management (central processing unit) 406, the second data link transceiver (MAC/PHY) 405, the second AFE (analog front end) drive circuit 402-2, the second coupling circuit 401-2, the IP downstream signal is advanced modulation, the IP upward signal is carried out demodulation, and CPU406 has the function that whole trunking is managed simultaneously.The output of described the second coupling circuit 401-2 connects the second AFE (analog front end) drive circuit 402-2 by the 3rd low pass filter 404-3, the output of the second AFE (analog front end) drive circuit 402-2 connects the second data link transceiver 405 by the 4th low pass filter 404-4, the output of the second data link transceiver 405 connects the second AFE (analog front end) drive circuit 402-2, the output of the second AFE (analog front end) drive circuit 402-2 connects the second coupling circuit 401-2, and described the second data link transceiver 405 also is connected with CPU management 406.
This trunking utilizes terminating circuit that the network modulation signal is carried out demodulation and is reduced to the standard ethernet signal on the basis of legacy network local side terminal architecture, isolates simultaneously the cable TV signal of the Coaxial Cables that coexists.The standard ethernet signal that restores flows to the local side apparatus in the trunking as input signal, carries out OFDM by the local side circuit and is modulated into the low frequency radio frequency signal, again exports by distribution network.The cable TV signal of separating by relaying flows to local side apparatus in the relaying again by carrying out isolation filter, utilize bidirectional filter to mix, the data radiofrequency signal of the cable TV signal that mixes is continued transmission downwards by the finger assignments network.Utilize the regeneration reducing of trunking, can reach 2 times transmission range of existing equipment.As long as bandwidth is enough, reserve in other words enough bandwidth in theory, can carry out unlimited relaying based on the modulation signal of HomePlugAV technology.For the function that guarantees the unaffected modulation and demodulation circuit part that need to be on trunking of its transport service VLAN and Management VLAN is becomed privileged setting.Allow its transparent transmission should be by its all service VLAN and Management VLAN, to realize interoperability by trunking of professional and management and managerial, realize simultaneously the unified management to relaying and other equipment.
Be illustrated in figure 2 as a typical application scenarios figure based on the broadband access transmission trunking equipment of HomePlugAV technology of the utility model implementation.EoC local side apparatus 101 receives from the radio-frequency signal of wired TV 105 of front end and the ethernet signal 106 of standard under normal circumstances, by carrying out OFDM modulation the ethernet signal of standard is modulated to the radio frequency IP signal that is suitable for the coaxial cable transmission, and be positioned at low-frequency band, be in different frequency bands with cable TV signal.Two kinds of radiofrequency signals are mixed by the bidirectional filter in the EoC local side apparatus 101, and the radiofrequency signal of exporting by coaxial cable had both comprised the radiofrequency signal of watching cable TV, had also comprised the radiofrequency signal through the IP of ovennodulation.IP radiofrequency signal after the modulation is equally applicable to transmit in coaxial cable, and has to a certain degree antidamping and antijamming capability.The radiofrequency signal of mixing is assigned in the user family by original radio frequency distribution network 102, the corresponding EoC terminal equipment 103 of access in user family, isolate IP radiofrequency signal and cable TV signal after the modulation by the bidirectional filter of terminal equipment, demodulation is reduced to the Ethernet baseband signal of standard to the IP radiofrequency signal, by the network interface output of terminal equipment, can carry out broadband services or interactive service etc.Cable TV signal is directly connect TV or the top box that the picks business that can teleview.
When access during based on the broadband access transmission trunking equipment of HomePlugAV technology, its application architecture as shown in Figure 2.Hybrid radio frequency signal by 101 outputs of EoC local side apparatus, its input port with trunking (104) is connected, trunking separates this signal, isolated IP radiofrequency signal is carried out the ethernet signal that demodulation is reduced to standard, this signal is modulated into radio frequency IP signal by trunking (104) again, the cable TV signal of separating by bidirectional filter 301 and input port mixes again, by the finger assignments network 102 continuation transmission downwards of next stage.By the demodulation of relaying, the regeneration that modulation is equivalent to signal, its transfer function and performance are unaffected, and regenerated signal can have same performance and function with original signal, thereby has realized relay transmission, can followingly hang more user simultaneously, realize user's dilatation.
The ethernet signal of standard is two-way signaling, and its uplink and downlink signals can according to circumstances carry out full duplex or half-duplex transmission.What the IP radiofrequency signal after the special nature of radio frequency cable has determined to modulate was carried out is the half-duplex transmission pattern.And cable TV itself belongs to the broadcast type one way signal, need not to do too much discussion.Below analyze respectively the operating state of its up-downgoing with the embodiment of Fig. 3.
For the first bidirectional filter 301-1 of downstream signal input mixed signal 202 through relaying, the IP radiofrequency signal of separating is through the first coupling circuit 401-1 translation difference sub-signal, carry out filtering through corresponding low pass filter again, filtered signal carries out Linear Driving through the first analog front circuit 402-1 and amplifies, again carry out filtering through low pass filter, enter the first data link transceiver 403 of core.The process demodulation has been reduced into the ethernet signal of standard, and this signal again enters the second data link transceiver 405 of modulation /demodulation module 303 and modulates, and the signal after the modulation and front end local side apparatus have same performance.Amplify through the second analog front circuit 402-2, differential signal after the output modulation, again becoming single-ended signal through the second coupling circuit 401-2 is output after radiofrequency signal is passed through the second bidirectional filter 301-2 and cable TV signal is mixed, in finger assignments network 102 access user men, be connected with EoC terminal equipment 103 in the user family.
Just in time with descending opposite, the modulation-demodulation circuit of relaying all has two-way function for upward signal, namely both can modulate also and can carry out demodulation.Cable TV carries out one-way transmission, and is just irrelevant with cable TV for the IP upward signal.From the EoC terminal transmission come upward signal separate through the second bidirectional filter 301-2 first, then carry out the signal conversion that single-ended variation is divided by the second coupling circuit 401-2, amplify conditioning through entering the second analog front circuit 402-2 after the low-pass filtering, the the second data link transceiver 405 that again enters modulation /demodulation module 303 behind low-pass filter circuit carries out demodulation, and the signal after the output enters demodulation modulation module 302 first data link transceivers 403 and modulates.Amplify by the first analog front circuit 402-1, after overcoupling, becoming radiofrequency signal through the first bidirectional filter 301-1 transmission that makes progress, be transferred to higher level's local side apparatus 101.
Claims (4)
1. based on the broadband access transmission trunking equipment of HomePlugAV technology, it is characterized in that, comprising: for separating of with first bidirectional filter (301-1) of mixed signal and the second bidirectional filter (301-2), be used for downstream signal demodulation reducing/regenerating and upward signal modulation demodulation modulation module (302), be used for the modulation /demodulation module (303) of downstream signal modulation and upward signal demodulation reducing/regenerating; Described the first bidirectional filter (301-1) end connects the input port of trunking, the first bidirectional filter (301-1) other end connects demodulation modulation module (302), the second bidirectional filter (301-2) end connects the output port of trunking, the second bidirectional filter (301-2) other end connects modulation /demodulation module (303), the first bidirectional filter (301-1) also is connected with the second bidirectional filter (301-2), and described demodulation modulation module (302) is connected with modulation /demodulation module (303).
2. as claimed in claim 1 based on the broadband access transmission trunking equipment of HomePlugAV technology, it is characterized in that: described demodulation modulation module (302) comprises the first coupling circuit (401-1), the first AFE (analog front end) drive circuit (402-1), the first data link transceiver (403), the output of described the first coupling circuit (401-1) connects the first AFE (analog front end) drive circuit (402-1) by the first low pass filter (404-1), the output of the first AFE (analog front end) drive circuit (402-1) connects the first data link transceiver (403) by the second low pass filter (404-2), the output of the first data link transceiver (403) connects the first AFE (analog front end) drive circuit (402-1), and the output of the first AFE (analog front end) drive circuit (402-1) connects the first coupling circuit (401-1).
3. as claimed in claim 1 based on the broadband access transmission trunking equipment of HomePlugAV technology, it is characterized in that: described modulation /demodulation module (303) comprises CPU management (406), the second data link transceiver (405), the second AFE (analog front end) drive circuit (402-2), the second coupling circuit (401-2), the output of described the second coupling circuit (401-2) connects the second AFE (analog front end) drive circuit (402-2) by the 3rd low pass filter (404-3), the output of the second AFE (analog front end) drive circuit (402-2) connects the second data link transceiver (405) by the 4th low pass filter (404-4), the output of the second data link transceiver (405) connects the second AFE (analog front end) drive circuit (402-2), the output of the second AFE (analog front end) drive circuit (402-2) connects the second coupling circuit (401-2), and described the second data link transceiver (405) also is connected with CPU management (406).
4. as claimed in claim 1 based on the broadband access transmission trunking equipment of HomePlugAV technology, it is characterized in that: described the first bidirectional filter (301-1), the second bidirectional filter (301-2) are connected by radio circuit or radio frequency cable between (303) with demodulation modulation module (302), modulation /demodulation module; Connect by the standard ethernet line between described demodulation modulation module (302) and the modulation /demodulation module (303).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220383846 CN202798700U (en) | 2012-08-03 | 2012-08-03 | Wideband access transmission trunk equipment based on HomePlugAV technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220383846 CN202798700U (en) | 2012-08-03 | 2012-08-03 | Wideband access transmission trunk equipment based on HomePlugAV technique |
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| Publication Number | Publication Date |
|---|---|
| CN202798700U true CN202798700U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220383846 Expired - Fee Related CN202798700U (en) | 2012-08-03 | 2012-08-03 | Wideband access transmission trunk equipment based on HomePlugAV technique |
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| Country | Link |
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| CN (1) | CN202798700U (en) |
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- 2012-08-03 CN CN 201220383846 patent/CN202798700U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20210803 |
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| CF01 | Termination of patent right due to non-payment of annual fee |