CN214315444U - Multimedia amplifier compatible with MoCA, CMTS and CATV signals - Google Patents
Multimedia amplifier compatible with MoCA, CMTS and CATV signals Download PDFInfo
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- CN214315444U CN214315444U CN202022991904.9U CN202022991904U CN214315444U CN 214315444 U CN214315444 U CN 214315444U CN 202022991904 U CN202022991904 U CN 202022991904U CN 214315444 U CN214315444 U CN 214315444U
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Abstract
The utility model belongs to the technical field of the cable TV, the multimedia amplifier of concretely relates to compatible MoCA, CMTS and CATV signal. The device comprises two distributors, a radio frequency relay, a load resistor, a high-pass filter circuit, a low-pass filter circuit and a MoCA low-pass filter; the distributor is connected with the radio frequency relay; the radio frequency relay is connected with the high-pass filter circuit, the radio frequency relay is connected with the load resistor, and the low-pass filter circuit is connected with the radio frequency relay; the high-pass filter circuit is connected with the MoCA low-pass filter; the MoCA low-pass filter is connected with the CMTS, the downstream output end and the upstream input end of the CATV signal, and the MoCA low-pass filter is connected with the low-pass filter circuit. The utility model discloses compatible MoCA, CMTS and CATV signal for digital television signal, MoCA2.0 signal and DOCSIS3.1 signal can be transmitted and two-way enlargies in same root coaxial cable, satisfies the demand of user's family multi-media, has the characteristics of wide application prospect.
Description
Technical Field
The utility model belongs to the technical field of the cable TV, the multimedia amplifier of concretely relates to compatible MoCA, CMTS and CATV signal.
Background
The daily life of modern families is inseparable from the network density, and with the continuous improvement of multimedia requirements of families, the network requirements of users become more and more diversified, and cable television network coaxial cables often have CATV digital television signals, also have broadband internet MoCA signals and CMTS signals based on a DOCSIS system. However, the existing coaxial cable cannot be compatible with MoCA, CMTS and CATV signals at the same time, and cannot meet the multimedia requirement of the user home. Therefore, it is necessary to design a device that is compatible with MoCA, CMTS and CATV signals at the same time.
For example, the system for integrating three networks of trusted coaxial cable based on SOC, low cost and low power consumption described in chinese utility model with application number CN200820088222.3, is composed of a local side device, a user side device and a network management system, and realizes multi-user access in MAC by using TDMA (time division multiple access) mode. Although the whole network coverage of HFC (coaxial cable optical fiber hybrid network) network under an optical station can be realized, the broadband access, the safety certification and the safety management of the last 1000 m user can be completed, the EPON, the GPON or the optical fiber transceiver is connected with a core broadband network, the broadband access of cable television users can be completed by cooperative work, and the three-network integration of bidirectional television, IPTV and the like can be realized, the defects are that the coaxial cable system of the patent can only be compatible with MoCA and CATV signals at the same time, but can not be compatible with MoCA, CMTS and CATV signals at the same time.
SUMMERY OF THE UTILITY MODEL
The utility model relates to an overcome prior art, current coaxial cable can't be compatible MoCA, CMTS and CATV signal simultaneously, can't satisfy the problem of user's family to the multimedia demand, provide one kind can make present digital television signal, MoCA2.0 signal and DOCSIS3.1 signal can transmit and two-way enlargeing in same root coaxial cable, satisfy the multimedia demand of user's family's compatible MoCA, CMTS and CATV signal's multimedia amplifier.
In order to achieve the purpose of the utility model, the utility model adopts the following technical scheme:
the multimedia amplifier compatible with MoCA, CMTS and CATV signals comprises two distributors, a radio frequency relay, a load resistor, a high-pass filter circuit, a low-pass filter circuit and a MoCA low-pass filter; the downstream signal input ends of the two distributors are connected with downstream signals of MoCA, CMTS and CATV signals; the upstream signal output ends of the two distributors are connected with upstream signals of MoCA, CMTS and CATV signals; one downlink signal output end of the two distributors is connected with a downlink signal input end of the radio frequency relay; the other downlink signal output end of the two distributors is a MoCA signal output end after signal distribution; one downlink signal output end of the radio frequency relay is connected with the input end of the high-pass filter circuit, the other output end of the radio frequency relay is connected with the load resistor, and the output end of the low-pass filter circuit is connected with the uplink signal input end of the radio frequency relay; the output end of the high-pass filter circuit is connected with the MoCA low-pass filter; one end of the MoCA low-pass filter is connected with the CMTS, the downstream output end and the upstream input end of the CATV signal, and the other end of the MoCA low-pass filter is connected with the input end of the low-pass filter circuit; and the uplink signal output end of the radio frequency relay is connected with the uplink signal input ends of the two distributors.
Preferably, the high-pass filter circuit includes a first high-pass filter, a downstream amplifier, and a second high-pass filter; the input end of the first high-pass filter is connected with the downlink signal output end of the radio-frequency relay; the output end of the first high-pass filter is connected with the input end of the downlink amplifier; the output end of the downlink amplifier is connected with the input end of the second high-pass filter; and the output end of the second high-pass filter is connected with the MoCA low-pass filter.
Preferably, the cutoff frequency parameters of the first high-pass filter and the second high-pass filter are both 54 MHz.
Preferably, the low-pass filter circuit includes a first low-pass filter, an up-link amplifier, and a second low-pass filter; the MoCA low-pass filter is connected with the input end of the first low-pass filter; the output end of the first low-pass filter is connected with the input end of the uplink amplifier; the output end of the uplink amplifier is connected with the input end of the second low-pass filter; and the output end of the second low-pass filter is connected with the uplink signal input end of the radio-frequency relay.
Preferably, the cutoff frequency parameters of the first low-pass filter and the second low-pass filter are both 42 MHz.
Preferably, the cut-off frequency parameter of the MoCA low-pass filter is 1002 MHz.
Preferably, the downstream signal input end and the upstream signal output end of the two distributors are the same port.
Preferably, the load resistor is grounded; the resistance value of the load resistor is 75 ohms.
Compared with the prior art, the utility model, beneficial effect is: (1) the utility model is used for the user terminal, the working frequency range of the CMTS and CATV downlink signal can reach 54MHz-1002MHz, the working frequency range of the CMTS and CATV uplink signal can reach 5MHz-42MHz, and the working frequency range of the MoCA signal can reach 1125MHz-1675 MHz; (2) the utility model discloses compatible MoCA, CMTS and CATV signal for digital television signal, MoCA2.0 signal and DOCSIS3.1 signal can be transmitted and two-way enlargies in same root coaxial cable, satisfies the demand of user's family multi-media, has extensive application prospect.
Drawings
Fig. 1 is a schematic diagram of a multimedia amplifier compatible with MoCA, CMTS and CATV signals according to the present invention.
In the figure: the device comprises two distributors 1, a radio frequency relay 2, a first high-pass filter 3, a downlink amplifier 4, a second high-pass filter 5, a first low-pass filter 6, an uplink amplifier 7, a second low-pass filter 8, a MoCA low-pass filter 9 and a load resistor 10.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be obtained from these drawings without inventive effort.
Example 1:
as shown in fig. 1, the multimedia amplifier compatible with MoCA, CMTS and CATV signals includes two distributors 1, a radio frequency relay 2, a load resistor 10, a first high pass filter 3, a downstream amplifier 4, a second high pass filter 5, a first low pass filter 6, an upstream amplifier 7, a second low pass filter 8 and a MoCA low pass filter 9; the downstream signal input ends of the two distributors are connected with downstream signals of MoCA, CMTS and CATV signals; the upstream signal output ends of the two distributors are connected with upstream signals of MoCA, CMTS and CATV signals; one downlink signal output end of the two distributors is connected with a downlink signal input end of the radio frequency relay; and the other downlink signal output end of the two distributors is a MoCA signal output end after signal distribution.
The input end of the first high-pass filter is connected with the downlink signal output end of the radio-frequency relay; the output end of the first high-pass filter is connected with the input end of the downlink amplifier; the output end of the downlink amplifier is connected with the input end of the second high-pass filter; the output end of the second high-pass filter is connected with the MoCA low-pass filter; and the other output end (NC end) of the radio frequency relay is connected with a load resistor, the load resistor is grounded, and the resistance value of the load resistor is 75 ohms. The first high-pass filter, the downlink amplifier and the second high-pass filter form a high-pass filter circuit. The cutoff frequency parameters of the first high-pass filter and the second high-pass filter are both 54 MHz.
One end of the MoCA low-pass filter is connected with the CMTS, the downstream output end and the upstream input end of the CATV signal; the MoCA low-pass filter is connected with the input end of the first low-pass filter; the output end of the first low-pass filter is connected with the input end of the uplink amplifier; the output end of the uplink amplifier is connected with the input end of the second low-pass filter; the output end of the second low-pass filter is connected with the uplink signal input end (NO end) of the radio-frequency relay; and an uplink signal output end (COM end) of the radio frequency relay is connected with uplink signal input ends of the two distributors. The first low-pass filter, the uplink amplifier and the second low-pass filter form a low-pass filter circuit. The cutoff frequency parameters of the first low-pass filter and the second low-pass filter are both 42 MHz.
Further, the cut-off frequency parameter of the MoCA low-pass filter is 1002 MHz.
The working frequency range of the two distributors is 5MHz-1675MHz, the downstream signal input end and the upstream signal output end are connected with downstream signals and upstream signals of MoCA, CMTS and CATV signals, the working frequency range of the CMTS and CATV downstream signals is 54MHz-1002MHz, the working frequency range of the CMTS and CATV upstream signals is 5MHz-42MHz, and the working frequency range of the MoCA2.0 signal is 1125MHz-1675 MHz.
The radio frequency relay adopts an ARE1309 radio frequency relay, and a downlink signal output end (NO end) of the radio frequency relay is connected with the input end of the first high-pass filter and the output end of the second low-pass filter. The high-pass filter is formed by connecting a plurality of sections of LC lumped-parameter inductors and capacitors in series and parallel, and has the advantages of simple structure, flexible design, convenience in adjustment and low cost. The high-pass filter adopts an inductor and a capacitor on the parallel arms to form a series resonance loop, the capacitor C on the series arms plays a role in stopping low-frequency signals, and the inductor L on the parallel arms plays a role in bypassing the low-frequency signals. By shifting the hollow coil of the high-pass filter, the resonant frequency of each resonant circuit is adjusted to be near 54MHz, high-frequency signals larger than 54MHz can smoothly pass through the high-pass filter, and the high-pass filter has good attenuation characteristic for low-frequency signals smaller than 54MHz, and the boundary of a characteristic curve of the high-pass filter is steep.
The output end of the first high-pass filter is connected with the input end of a downlink amplifier, the downlink amplifier adopts a TAT7461 amplification chip, and the output end of the downlink amplifier is connected with the input end of a second high-pass filter. The second high pass filter is identical to the first high pass filter.
The output end of the second high-pass filter is connected with a MoCA low-pass filter, and downstream signals of the CMTS and the CATV are output after passing through the MoCA low-pass filter. One end of the MoCA low-pass filter is connected with the CMTS, the downstream output end and the upstream input end of the CATV signal.
Upstream signals of the CMTS and the CATV pass through the MoCA low-pass filter and then are connected with the input end of the first low-pass filter, the low-pass filter is a filter formed by connecting a plurality of sections of LC lumped parameter inductors L and capacitors C in series and in parallel, the inductor L on the serial arm of the low-pass filter presents very large inductive reactance to high frequency, so that the signals with very high frequency can be prevented from passing through, and the capacitor C on the parallel arm presents very small capacitive reactance to the signals with very high frequency, so that a bypass effect is realized on the high-frequency signals. By toggling the air core coil of the low pass filter, each resonance frequency point is adjusted to be around 42 MHz. So that low-frequency signals smaller than 42MHz can smoothly pass through the low-pass filter, and high-frequency signals larger than 42MHz have better attenuation characteristic, and the low-pass filter has higher out-of-band selectivity.
The principle of the MoCA low-pass filter is the same as that of the low-pass filter, signals smaller than 1002MHz can smoothly pass through the MoCA low-pass filter, and the signals larger than 1002MHz have better attenuation characteristics, so that the MoCA2.0 signals are isolated in a CMTS and CATV signal channel.
The output end of the first low-pass filter is connected with the input end of the uplink amplifier, the uplink amplifier adopts a BFG35 broadband silicon radio frequency NPN transistor, and two BFG35 amplifying tubes form a push-pull amplifying circuit, so that the linear index of the uplink amplifier is further improved. The output end of the uplink amplifier is connected with the input end of a second low-pass filter, and the second low-pass filter is completely the same as the first low-pass filter.
The output end of the second low-pass filter is connected with the uplink signal input end (NO end) of the radio-frequency relay, the uplink signal output end (COM end) of the radio-frequency relay is connected with the uplink signal input ends of the two distributors, and the uplink signal output ends of the two distributors are used as the downlink signal input end and the uplink signal output end, namely the downlink signal input end and the uplink signal output end of the two distributors are the same port.
The utility model is used for the user terminal, the working frequency range of the CMTS and CATV downlink signal can reach 54MHz-1002MHz, the working frequency range of the CMTS and CATV uplink signal can reach 5MHz-42MHz, and the working frequency range of the MoCA signal can reach 1125MHz-1675 MHz; the utility model discloses compatible MoCA, CMTS and CATV signal for digital television signal, MoCA2.0 signal and DOCSIS3.1 signal can be transmitted and two-way enlargies in same root coaxial cable, satisfies the demand of user's family multi-media, has extensive application prospect.
The foregoing has been a detailed description of the preferred embodiments and principles of the present invention, and it will be apparent to those skilled in the art that variations may be made in the specific embodiments based on the concepts of the present invention, and such variations are considered as within the scope of the present invention.
Claims (8)
1. The multimedia amplifier compatible with MoCA, CMTS and CATV signals is characterized by comprising two distributors, a radio frequency relay, a load resistor, a high-pass filter circuit, a low-pass filter circuit and a MoCA low-pass filter; the downstream signal input ends of the two distributors are connected with downstream signals of MoCA, CMTS and CATV signals; the upstream signal output ends of the two distributors are connected with upstream signals of MoCA, CMTS and CATV signals; one downlink signal output end of the two distributors is connected with a downlink signal input end of the radio frequency relay; the other downlink signal output end of the two distributors is a MoCA signal output end after signal distribution; one downlink signal output end of the radio frequency relay is connected with the input end of the high-pass filter circuit, the other output end of the radio frequency relay is connected with the load resistor, and the output end of the low-pass filter circuit is connected with the uplink signal input end of the radio frequency relay; the output end of the high-pass filter circuit is connected with the MoCA low-pass filter; one end of the MoCA low-pass filter is connected with the CMTS, the downstream output end and the upstream input end of the CATV signal, and the other end of the MoCA low-pass filter is connected with the input end of the low-pass filter circuit; and the uplink signal output end of the radio frequency relay is connected with the uplink signal input ends of the two distributors.
2. The MoCA, CMTS and CATV signal compatible multimedia amplifier of claim 1, wherein the high pass filter circuit comprises a first high pass filter, a downstream amplifier and a second high pass filter; the input end of the first high-pass filter is connected with the downlink signal output end of the radio-frequency relay; the output end of the first high-pass filter is connected with the input end of the downlink amplifier; the output end of the downlink amplifier is connected with the input end of the second high-pass filter; and the output end of the second high-pass filter is connected with the MoCA low-pass filter.
3. The MoCA, CMTS and CATV signal compatible multimedia amplifier of claim 2, wherein the cutoff frequency parameters of the first and second high pass filters are 54 MHz.
4. The MoCA, CMTS and CATV signal compatible multimedia amplifier of claim 3, wherein the low pass filter circuit comprises a first low pass filter, an upstream amplifier and a second low pass filter; the MoCA low-pass filter is connected with the input end of the first low-pass filter; the output end of the first low-pass filter is connected with the input end of the uplink amplifier; the output end of the uplink amplifier is connected with the input end of the second low-pass filter; and the output end of the second low-pass filter is connected with the uplink signal input end of the radio-frequency relay.
5. The MoCA, CMTS and CATV signal compatible multimedia amplifier of claim 4, wherein the cutoff frequency parameters of the first and second low pass filters are 42 MHz.
6. The MoCA, CMTS and CATV signal compatible multimedia amplifier of claim 5, wherein the MoCA low pass filter has a cutoff frequency parameter of 1002 MHz.
7. The MoCA, CMTS and CATV signal compatible multimedia amplifier of any of claims 1-6, wherein the downstream signal input and the upstream signal output of the two splitters are the same port.
8. The MoCA, CMTS and CATV signal compatible multimedia amplifier of any of claims 1-6, wherein the load resistor is grounded; the resistance value of the load resistor is 75 ohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022991904.9U CN214315444U (en) | 2020-12-14 | 2020-12-14 | Multimedia amplifier compatible with MoCA, CMTS and CATV signals |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022991904.9U CN214315444U (en) | 2020-12-14 | 2020-12-14 | Multimedia amplifier compatible with MoCA, CMTS and CATV signals |
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| Publication Number | Publication Date |
|---|---|
| CN214315444U true CN214315444U (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022991904.9U Active CN214315444U (en) | 2020-12-14 | 2020-12-14 | Multimedia amplifier compatible with MoCA, CMTS and CATV signals |
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| CN (1) | CN214315444U (en) |
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