JP3192341U - Branching device with MoCA blocking function - Google Patents

Abstract

A branching device having a MoCA cutoff function capable of preventing mutual interference between a frequency signal of 1,125 MHz to 1,675 MHz and a frequency signal of 5 MHz to 1,002 MHz of a cable television is provided.
A branching device having a MoCA cutoff function includes a low-pass filtering unit 10 used to input a frequency signal, a directional coupler 20 used to output the frequency signal, and an input terminal having a directional coupling. The first class divider 30 is connected to the second output terminal of the filter 20 and used to output the frequency signal after being attenuated by the first numerical value, and the input terminal is connected to the output terminal of the first class distributor 30. , And at least one secondary distributor 40 used to output the frequency signal to at least one client connector 48 after a second numerical attenuation.
[Selection] Figure 2

Description

  The present invention relates to a branching device, and more particularly to a branching device having a MoCA cutoff function.

  The current indoor cable TV system uses a cable modem or a set top box system to provide a cable TV with a tap, a splitter, or a house amplifier. Connect to cable and download video signal (with a frequency of about 54MHz to 1000MHz) or transmit data (upstream with a frequency of about 5MHz to 42MHz) into the host computer of the cable television system .

  The Coaxial Cable Multimedia Alliance (MoCA) protocol is an emerging protocol that allows transmission of multimedia video or audio over the current cable television coaxial cable, and its communication frequency band is: 1,125 MHz to 1,675 MHz.

  However, the design of the current branching unit structure uses a frequency signal of 5MHz to 1,002MHz, and when used in the MoCA system, the frequency signal of 1,125MHz to 1,675MHz between clients is in the main branch line input end. There is a possibility that the frequency signals of the two frequency bands may interfere with each other, and further, it affects the quality of the cable television and belongs to the shortage.

  1a and 1b are referred to together, in which FIG. 1a is an explanatory view of insertion loss of a main branch line input end and a main branch line output end of a conventional branching device, and FIG. 1b is a diagram of a conventional branching device. It is insertion loss explanatory drawing between the main branch line input end and a client connector. As shown in Fig. 1a, the insertion loss at ▽ 2 is -7.40dB and the insertion loss at ▽ 3 is -7.78dB between the main branch line input end and main branch line output end of the conventional branching device. The insertion loss of ▽ 4 is -20.1dB. As shown in FIG. 1b, the insertion loss at ▽ 2 is -20.17dB and the insertion loss at ▽ 3 is -21.71dB between the main branch line input end of the conventional branching device and the client connector. The insertion loss is -36.13 dB, the isolation is not good, and the purpose of filtering out frequency signals from 1,125 MHz to 1,675 MHz cannot be achieved.

  In contrast to the above-described defects of the conventional branching device, the present invention provides a branching device having a MoCA blocking function and improves the defect.

Japanese Patent Publication No. 2012-525764

  An object of the present invention is to have a low-pass filtering unit, and efficiently filter the frequency signal of 1,125 MHz to 1,675 MHz, and the frequency signal of 1,125 MHz to 1,675 MHz and the frequency signal of 5 MHz to 1,002 MHz of cable television. It is an object of the present invention to provide a branching device having a MoCA cutoff function that can prevent mutual interference from occurring.

  Another object of the present invention is to provide a branching device having a resistance coil and having a MoCA cutoff function used to connect a system power supply into the main branch line output.

  In order to achieve the above object, the branching device having the MoCA cutoff function of the present application has one end connected to the main branch line input end, inputs a frequency signal, and performs low-pass filtering on the frequency signal. The low-pass filtering unit to be used, its input end connected to the output end of the low-pass filtering unit, its first output end connected to the main branch line output end, and the direction used for outputting the frequency signal A combiner, a first class distributor connected to the second output terminal of the directional coupler and outputting the frequency signal after being attenuated by a first numerical value; and an input terminal connected to the first output terminal And at least one second class distributor connected to the output of the class distributor and used to output the frequency signal to at least one client after a second numerical attenuation.

  By implementing the branching device having the MoCA cutoff function of the present application, it has a low-pass filtering unit, efficiently filters the frequency signal of 1,125 MHz to 1,675 MHz, and the frequency signal of 1,125 MHz to 1,675 MHz It can prevent the frequency signal of 5MHz to 1,002MHz of cable TV from generating mutual interference, and it has a resistance coil and is used to connect the system power supply into the main branch line input terminal And so on.

It is insertion loss explanatory drawing between the main branch line input terminal and the main branch line output terminal of the conventional branching device. It is insertion loss explanatory drawing between the main branch line input end of a conventional branching device, and a client connector. It is block explanatory drawing of the branching device which has the MoCA interruption | blocking function of the suitable Example of this application. It is block explanatory drawing of the branching device which has the MoCA interruption | blocking function of the suitable Example of this application. It is circuit explanatory drawing of the 1st class divider | distributor of this application. It is insertion loss explanatory drawing between the main branch line input terminal and the main branch line output terminal of the branching device of this application. It is insertion loss explanatory drawing between the main branch line input end of the branching device of this application, and a client connector. It is explanatory drawing in which the branching device of the suitable Example of this application has a printed circuit board further. It is explanatory drawing in which the branching device of the suitable Example of this application has a shell further.

  In order to make the structure, features and purpose of the present invention more comprehensible, the following detailed description is made with reference to the drawings and preferred embodiments.

  2 to 4 together, FIG. 2 shows a block diagram of a branching device having a MoCA cutoff function of a preferred embodiment of the present application, and FIG. 3 is a circuit diagram of a low-pass filtering unit of the present application. FIG. 4 is a circuit explanatory diagram of the first class distributor of the present application.

  As shown in the figure, the branching device having the MoCA blocking function of the present invention includes a low-pass filtering unit 10, a directional coupler 20, a first-order distributor 30, and at least one second-order distributor 40. Consists of including.

  One end of the low-pass filtering unit 10 is connected to the main branch line input terminal 50 and used to input a frequency signal and perform low-pass filtering on the frequency signal, of which the main branch line input The end 50 is, for example, but not limited to, a coaxial cable connector of a cable television, used to input a radio frequency (RF) signal into a cable (not shown), the frequency of which is For example, it is 5 MHz to 1,002 MHz. Among them, the low-pass filtering unit 10 further includes at least one low-pass filter 11 whose pass frequency band is not limited to this, for example, 5 MHz to 1,002 MHz, The cutoff frequency band is not limited to this, and is, for example, 1,125 MHz to 1,675 MHz.

  The input terminal of the directional coupler 20 is connected to the output terminal of the low-pass filtering unit 10, and the first output terminal 21 is connected to the main branch line output terminal 60 to output the frequency signal. Use. Of these, the main branch line output 60 is, for example, a coaxial cable connector of a cable television, and outputs a radio frequency (RF) signal into the cable (not shown). The frequency used in is not limited to this, but is, for example, 5 MHz to 1,002 MHz.

  The input terminal of the first class distributor 30 is connected to the second output terminal 22 of the directional coupler 20 and is used to output the frequency signal after the first numerical attenuation. Of these, the first numerical value is, for example, 3.5 dB, although not limited thereto.

  The input terminal of the second class distributor 40 is connected to the output terminal of the first class distributor 30 and is used to output the frequency signal to at least one client connector 48 after being attenuated by a second numerical value. Of these, the second numerical value is, for example, 3.5 dB, although not limited thereto. Among them, the frequency of the frequency signal output by the client connector 48 is 5 MHz to 1,002 MHz and 1,125 MHz to 1,675 MHz, of which 5 MHz to 1,002 MHz can be provided for cable TV signal upload and download, Communication can be performed between two clients using the Coaxial Cable Multimedia Federation (MoCA) protocol.

  Further, the branching device having the MoCA blocking function of the present application further includes a resistance coil 70, one end of which is connected to the main branch line input end 50 and the other end connected to the main branch line output end 60. The system power supply is used to connect the main branch line output terminal 60.

  As shown in FIG. 3, the low-pass filtering unit 10 of the present application includes a multi-stage low-pass filter 11 connected in series, and each low-pass filter 11 includes at least one inductor 111, a first capacitor 112, and the like. The second capacitor 113 is connected in parallel and grounded. In the present embodiment, the case where the four-stage low-pass filter 11 is formed in series will be described as an example, but the present invention is not limited to this.

  As shown in FIG. 4, the primary distributor 30 of the present application is composed of two coils 31, 32, two inductors 33, 34, a capacitor 35, and a resistor 36, of which one end of the coil 31 is It connects to the 2nd output end 22 of the direction coupler 20, and the other end of the coil 31 is connected to the ground. One end of the coil 32 is connected to one end of the inductor 33, and the other end of the coil 32 is connected to one end of the inductor 34. One end of the inductor capacitor 35 is connected to the middle of the coil 312 and the coil 323, and the other end of the inductor capacitor 35 is connected to the ground. One end of the resistor 36 is connected to the other end of the inductor 33, the other end of the resistor 36 is connected to the other end of the inductor 34, and both ends of the resistor 36 are respectively connected to the second class. Connect to the input of distributor 40. Of these, the secondary distributor 40 has a structure similar to that of the primary distributor 30, and is not repeated here.

  5a to 5b are also referred to, and FIG. 5a is an explanatory diagram of insertion loss between the main branch line input end and the main branch line output end of the branching device of the present application. FIG. 5b is an explanatory diagram of input loss between the main branch line input end of the branching device of the present application and the client connector. As shown in FIG. 5a, between the main branch line output terminal 50 and the main branch line output terminal of the branching device having the MoCA cutoff function of the present application, the insertion loss at ▽ 2 is −3.77 dB, The insertion loss is -44.73dB, and the insertion loss at ▽ 4 is -51.08dB. As shown in FIG. 5b, between the main branch line output 50 and the client connector 48 of the branching device having the MoCA cutoff function of the present application, the insertion loss at ▽ 2 is -21.29 dB, and the insertion loss at ▽ 3. Is -61.68 dB and the insertion loss at ▽ 4 is -82.80 dB. FIG. 5 a and FIG. 5 b are better compared to the branch of FIG. 1 a and FIG. (40 to 50 dB), and the low-pass filtering unit 10 can achieve the purpose of filtering out frequency signals of 1,125 MHz to 1,675 MHz.

  The operation principle of the branching device having the MoCA cutoff function of the present application is, for example, that, when operating, a cable television frequency signal of 5 MHz to 1,002 MHz input from the main branch line input terminal 50 performs filtering of the low-pass filtering unit 10. Then, the signal can be output to the main branch line output terminal 60 and the input terminal of the first class distributor 30 through the directional coupler 20. The frequency signal of 5 MHz to 1,002 MHz can have an intensity of about 35 dB after further attenuation of the first class distributor 30 and the second class distributor 40 (from the main branch line input terminal 50 to the client connector 48). while). When communication is performed between two clients using the MoCA protocol, the frequency signal of 1,125 MHz to 1,675 MHz is connected to the first-class distributor 30 and the second-class distributor 40 and connected to the first of the directional couplers. 2 is output to the output terminal 22. After passing through the low-pass filtering unit 10, the frequency signal of 1,125 MHz to 1,675 MHz is blocked and does not enter the main branch line input 50, and therefore the 1,125 MHz to 1,675 MHz. Thus, the frequency signal of 1,125 MHz to 1,675 MHz and the frequency signal of 5 MHz to 1,002 MHz of the cable television can be prevented from generating mutual interference.

  As shown in FIG. 6, the branching device having the MoCA blocking function of the present application further includes a printed circuit board 80, and includes the low-pass filtering unit 10, the directional coupler 20, the first-order branching device 30, and at least one of them. A member such as the second class distributor 40 is mounted.

  As shown in FIG. 7, the branching device having the MoCA blocking function of the present application further includes a shell 90, the printed circuit board 80, the main branch line input end 50, the main branch line output end 60, and the client. A member such as the connector 48 is accommodated. The shell 90 is not limited to this, and is formed of, for example, a metal material. Therefore, the branching device having the MoCA blocking function of the present application has an inventive step as compared with the conventional branching device.

  As described above, by implementing the branching device having the MoCA cutoff function of the present application, it has a low-pass filtering unit and efficiently filters the frequency signal of 1,125 MHz to 1,675 MHz, and the 1,125 MHz to 1,675 The frequency signal of MHz and the frequency signal of 5MHz to 1,002MHz of cable TV can prevent mutual interference, and it has a resistance coil and connects the system power supply into the main branch line input The book has an inventive step compared to conventional branching devices.

  The detailed description of the present invention according to the above embodiments does not limit the scope of the present invention. Even if a person familiar with the present technology makes changes or adjustments within the scope of the present invention, the important significance of the present invention is not lost and is included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Low-pass filtering unit 11 Low-pass filter 111 Inductor 112 1st capacitor | condenser 113 2nd capacitor | condenser 20 Direction coupler 21 1st output terminal 22 2nd output terminal 30 1st class dividers 31 and 32 Coils 33 and 34 Inductor 35 Capacitor 36 Resistor 40 Second class distributor 48 Client connector 50 Main branch line input terminal 60 Main branch line output terminal 70 Resistance coil 80 Printed circuit board 90 Shell

Claims (8)

A low-pass filtering unit used to connect one end to the main branch line input end, input a frequency signal, and perform low-pass filtering on the frequency signal;
A directional coupler connected to the output end of the low-pass filtering unit, the first output end connected to the main branch line output end, and used to output the frequency signal;
A first class distributor, whose input terminal is connected to the second output terminal of the directional coupler and is used to output the frequency signal after being attenuated by a first numerical value;
At least one secondary distributor used to connect its input to the output of the primary distributor and output the frequency signal to at least one client connector after a second numerical attenuation;
A branching device having a MoCA blocking function. The branching device having a MoCA cutoff function according to claim 1, wherein the frequency signal is 5 MHz to 1,002 MHz. The low-pass filtering unit further includes at least one low-pass filter whose pass frequency band is 5 MHz to 1,002 MHz and whose cut-off frequency band is 1,125 MHz to 1,675 MHz. A branching device having the described MoCA blocking function. The low-pass filtering unit includes a multi-stage low-pass filter connected in series, and each low-pass filter includes at least one inductor, a first capacitor in parallel and a grounded second capacitor. Item 4. A branching device having the MoCA blocking function according to Item 3. 2. The branching device having a MoCA cutoff function according to claim 1, wherein the first-class distributor includes two coils, two inductors, a capacitor, and a resistor, and the first numerical value is 3.5 dB. 2. The branching device having a MoCA cutoff function according to claim 1, wherein the second class distributor includes two coils, two inductors, a capacitor, and a resistor, and the second numerical value is 3.5 dB. And a resistance coil used for connecting a system power supply to the main branch line output terminal, and having one end connected to the main branch line input terminal and the other end connected to the main branch line output terminal. A branching device having the MoCA blocking function according to 1.   The frequency of the frequency signal output by the client connector is 5 MHz to 1,002 MHz and 1,125 MHz to 1,675 MHz, of which 5 MHz to 1,002 MHz can be used for uploading and downloading cable TV signals. The branching unit having a MoCA blocking function according to claim 1, wherein the MHz can cause communication between two clients by a coaxial cable (MoCA) protocol using a coaxial cable.

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