JP2016143936A - Communication device and communication system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that suppresses increase of the circuit scale while adapting to two types of transmission paths.SOLUTION: A first terminal 48 is connectable to a power line 16. A second terminal 56 is connectable to an exclusive line 18. Power of a signal to be transmitted to another communication device which is connected from the first terminal 48 through the power line 16 is different from power of a signal to be transmitted to the other communication device which is connected from the second terminal 56 through the exclusive line 18. The format of a signal to be transmitted to the other communication device which is connected from the first terminal 48 through the power line 16 is common to the format of a signal to be transmitted to the other communication device which is connected from the second terminal 56 through the exclusive line 18.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a communication technique, and more particularly to a communication apparatus connectable to a plurality of networks and a communication system using the same.

  PLC (Power Line Communication) is a technology that uses a power line as a communication line. Since the PLC uses an existing power line, it is expected as a technology that can realize a high-speed communication of 100 Mbps or more without newly laying a communication line. However, the PLC is different in the state of the communication line depending on the structure of the house where the communication is performed, and is easily affected by noise caused by the life rhythm. In order to improve the communication quality under such circumstances, it has been proposed to use a coaxial line and a power line in combination (see, for example, Patent Document 1).

JP 2010-232843 A

  In order to use two types of transmission paths, the communication device needs to be equipped with a communication function corresponding to each transmission path. However, if a plurality of communication functions are implemented, the circuit scale in the communication device becomes large.

  The present invention has been made in view of such a situation, and an object thereof is to provide a technique for suppressing an increase in circuit scale while supporting two types of transmission paths.

  In order to solve the above problems, a communication device according to an aspect of the present invention can be connected to a first terminal connectable to the first network and a second network different from the first network connectable to the first terminal. Second terminal. The power of the signal transmitted from the first terminal to the other communication device connected via the first network is transmitted from the second terminal to the other communication device connected via the second network. Unlike the signal power, the format of the signal transmitted from the first terminal to the other communication device connected via the first network is the same as the format of the signal transmitted from the second terminal to the other communication device connected via the second network. It is the same as the format of the signal transmitted to it.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, it is possible to suppress an increase in circuit scale while supporting two types of transmission paths.

It is a figure which shows the structure of the communication system which concerns on Example 1 of this invention. It is a figure which shows the structure of the communication apparatus of FIG. It is a figure which shows the format of the packet signal transmitted in the communication system of FIG. It is a figure which shows the structure of the analog process part of FIG. It is a figure which shows the structure of the analog process part which concerns on Example 2 of this invention. It is a figure which shows the structure of the analog process part which concerns on Example 3 of this invention.

Example 1
Before describing the present invention in detail, an outline will be described. Embodiment 1 of the present invention relates to a communication system including a plurality of communication devices. In order to improve communication quality, communication apparatuses are connected by a power line, and are also connected by a line other than the power line, for example, a wireless line or a wired line. Here, for example, it is assumed that they are connected by a wired line, particularly a dedicated line. Therefore, the communication device communicates with other communication devices by PLC and dedicated line communication. As described above, when a function for executing two types of communication is mounted on a communication device, the circuit scale of the communication device increases. In order to suppress an increase in circuit scale, the communication apparatus according to the present embodiment is configured as follows.

  The format of the packet signal used in the PLC is the same as the format of the packet signal used in leased line communication. On the other hand, the transmission power defined in the PLC is different from the transmission power defined in the leased line communication. Therefore, the communication apparatus generates a packet signal for PLC and dedicated line communication in the same circuit, and changes only the amplification factor when transmitting it. Therefore, even if it is a case where it respond | corresponds to two types of communication, the increase in a circuit scale is suppressed.

  FIG. 1 shows a configuration of a communication system 100 according to Embodiment 1 of the present invention. The communication system 100 includes a first communication device 10a, a second communication device 10b, a third communication device 10c, an Nth communication device 10n, the Internet 12, and a PC (Personal Computer) 14 collectively referred to as the communication device 10. 1PC14a, 2nd PC14b, Nth-1PC14n-1, the power line 16, and the exclusive line 18 are included.

  The communication system 100 includes N communication devices 10. N may be an arbitrary number. For example, the maximum number is “128”. The communication apparatuses 10 are connected to each other by a power line 16 that is a first network, and are also connected to each other by a dedicated line 18 that is a second network. Here, the power line 16 and the dedicated line 18 are provided independently. The power line 16 and the dedicated line 18 are shown as a single line, but are actually two or more conductors. In particular, it is assumed that the dedicated line 18 is a pair cable. Note that one of the plurality of communication devices 10, for example, the first communication device 10a corresponds to a parent device, and the remaining communication devices 10 correspond to child devices. For example, the parent device manages the connection state (link information) with the child device.

  The first communication device 10 a is connected to the Internet 12, and the other communication device 10 is connected to the PC 14. Here, the Internet 12, the PC 14, and the communication device 10 are connected by Ethernet (registered trademark). With such a configuration, for example, the first PC 14a accesses the Internet 12 via the second communication device 10b, the power line 16, the dedicated line 18, and the first communication device 10a. Note that a telephone, a television receiver, and a recording device may be connected to the communication device 10 instead of the PC 14. Moreover, the communication apparatus 10 may not be arrange | positioned independently but may be incorporated in an electric equipment. Examples of electrical devices are home appliances such as telephones, television receivers, recording devices, video decks, and set-top boxes, and office equipment such as PCs, fax machines, and printers.

  FIG. 2 shows the configuration of the communication device 10. The communication device 10 includes a circuit module 20 and a switching power supply 22. The circuit module 20 includes a first coupling collectively referred to as an RJ 30, a first PHY unit 32, a MAC unit 34, a second PHY unit 36, a control unit 38, an analog processing unit 42, a first transformer 44, and a coupling capacitor 46. Capacitor 46 a, second coupling capacitor 46 b, first terminal 48, second transformer 54, and second terminal 56. Further, the communication device 10 is connected to a power plug 50 and the power plug 50 is connected to a power outlet 52.

  The switching power supply 22 is connected to the first transformer 44 and further connected to the power line 16 via the first terminal 48, the power plug 50, and the power outlet 52. The switching power supply 22 generates a + 1.2V voltage 90, a + 3.3V voltage 92, and a + 12V voltage 94 based on the power supplied from the first transformer 44, and a + 1.2V voltage 90, a + 3.3V voltage 92, A + 12V voltage 94 is supplied to the circuit module 20. The switching power supply 22 includes, for example, a switching transformer and a DC-DC converter (both not shown).

  The circuit module 20 executes a relay process between communication using Ethernet (registered trademark) and PLC or dedicated line communication. Note that the PLC or leased line communication may be collectively referred to as “network communication”. Hereinafter, the direction of relaying from Ethernet (registered trademark) communication to network communication is referred to as a “first direction”, and the direction of relaying from network communication to Ethernet (registered trademark) communication is referred to as a “second direction”. The RJ 30 is a modular jack and can be connected to a cable that supports Ethernet (registered trademark) communication. The RJ 30 receives an Ethernet (registered trademark) signal from the Internet 12 or the PC 14 (not shown) as processing in the first direction. The RJ 30 outputs the received Ethernet (registered trademark) signal to the first PHY unit 32. The RJ 30 inputs an Ethernet (registered trademark) signal from the first PHY unit 32 and transmits the Ethernet (registered trademark) signal to the Internet 12 or the PC 14 as processing in the second direction.

  The first PHY unit 32 inputs an Ethernet (registered trademark) signal from the RJ 30 as processing in the first direction. The first PHY unit 32 converts an Ethernet (registered trademark) signal from a physical layer to a MAC (Media Access Control) layer. The first PHY unit 32 outputs an Ethernet (registered trademark) signal (hereinafter also referred to as an “Ethernet (registered trademark) signal”) converted into the MAC layer to the MAC unit 34. The first PHY unit 32 inputs an Ethernet (registered trademark) signal from the MAC unit 34 as processing in the second direction. The first PHY unit 32 converts the Ethernet (registered trademark) signal from the MAC layer to the physical layer. The first PHY unit 32 outputs an Ethernet (registered trademark) signal converted to the physical layer to the RJ 30. In addition, since a well-known technique should just be used for the conversion of the Ethernet (trademark) signal between a physical layer and a MAC layer, description is abbreviate | omitted here.

  The MAC unit 34 has a bridge function for an Ethernet (registered trademark) signal, for example, a layer 2 switch function. Therefore, the first PHY unit 32 that is to perform communication by Ethernet (registered trademark) is connected to one side of the MAC unit 34. Further, a second PHY unit 36 that is to perform network communication is connected to the other side of the MAC unit 34. The MAC unit 34 executes layer 2 frame exchange according to the destination MAC address included in the Ethernet (registered trademark) signal. Here, as described above, the frame that the MAC unit 34 inputs and outputs with the first PHY unit 32 is called an Ethernet (registered trademark) signal, but the MAC unit 34 inputs and outputs with the second PHY unit 36. The frame is called a “network signal”. Therefore, the MAC unit 34 inputs an Ethernet (registered trademark) signal from the first PHY unit 32 and outputs a network signal to the second PHY unit 36 as processing in the first direction. On the other hand, as a process in the second direction, the MAC unit 34 inputs a network signal from the second PHY unit 36 and outputs an Ethernet (registered trademark) signal to the first PHY unit 32.

  The second PHY unit 36 executes modulation / demodulation processing for network communication. Here, the PLC and the dedicated line communication commonly execute multi-carrier communication using a plurality of subcarriers such as an OFDM (Orthogonal Frequency Division Multiplexing) scheme. Note that wavelet transform may be used for the processing of the OFDM method, or FFT (Fast Fourier Transform) may be used.

  The second PHY unit 36 inputs a network signal from the MAC unit 34 as processing in the first direction. The second PHY unit 36 generates an OFDM signal by performing inverse wavelet transform or IFFT (Inverse FFT) on the network signal. The second PHY unit 36 converts the OFDM signal from a digital signal to an analog signal. Further, the second PHY unit 36 outputs the OFDM signal converted into an analog signal (hereinafter also referred to as “network signal”) to the analog processing unit 42.

  The second PHY unit 36 inputs the network signal from the analog processing unit 42 as the processing in the second direction. The second PHY unit 36 converts the network signal from an analog signal to a digital signal. The second PHY unit 36 generates a serial signal by performing wavelet transform or FFT on the OFDM signal that is a network signal converted into a digital signal. Further, the second PHY unit 36 outputs a serial signal (hereinafter also referred to as “network signal”) to the MAC unit 34.

  Here, a network signal transmitted between the second PHY unit 36 and the analog processing unit 42 will be described with reference to FIG. FIG. 3 shows a format of a packet signal transmitted in the communication system 100. A preamble is arranged at the head of the packet signal. The preamble is used on the receiving side for timing synchronization, transmission path estimation, and the like. The header arranged in the subsequent stage of the preamble includes physical layer control information. The payload arranged after the header corresponds to data in the physical layer, and includes a MAC layer frame, that is, a MAC layer network signal. As described above, the format of the packet signal is commonly used in the PLC and the leased line communication. Returning to FIG.

  The analog processing unit 42 performs band limitation and amplification on the network signal. Here, the configuration of the analog processing unit 42 will be described with reference to FIG. FIG. 4 shows the configuration of the analog processing unit 42. The analog processing unit 42 includes a transmission filter 70, a first transmission amplification unit 72 a collectively referred to as a transmission amplification unit 72, a second transmission amplification unit 72 b, and a first reception filter 74 a generally referred to as a reception filter 74. , A second receiving filter 74b, a first receiving amplifying unit 76a and a second receiving amplifying unit 76b collectively referred to as a receiving amplifying unit 76.

  As processing in the first direction, the transmission filter 70 receives a network signal from the second PHY unit 36. The transmission filter 70 is a band limiting filter or a low-pass filter, and limits the band of the input network signal. The first transmission amplifying unit 72 a amplifies the network signal whose band is controlled by the transmission filter 70, and outputs it to the first transformer 44. Further, the amplified network signal is output from the first transformer 44 to the first terminal 48. Here, the signal to be processed in the first transmission amplifying unit 72a is a signal in the PLC. The second transmission amplifying unit 72 b amplifies the network signal whose band is controlled by the transmission filter 70, and outputs it to the second transformer 54. Further, the amplified network signal is output from the second transformer 54 to the second terminal 56. Here, the signal to be processed in the second transmission amplifying unit 72b is a signal in leased line communication.

  The regulation of transmission power in PLC is different from the regulation of transmission power in leased line communication. For example, the former is defined as 10 mW and the latter is defined as unlimited. Therefore, the power of the signal transmitted from the first terminal 48 to the other communication device 10 connected via the power line 16 is transmitted from the second terminal 56 to the other communication device 10 connected via the dedicated line 18. On the other hand, it is smaller than the power of the signal transmitted. Corresponding to this, the amplification factor of the first transmission amplification unit 72a is set to be smaller than the amplification factor of the second transmission amplification unit 72b. Here, the analog processing unit 42 outputs a network signal to both the first transformer 44 and the second transformer 54. Therefore, transmission of a signal from the communication device 10 to another communication device 10 is performed by PLC and dedicated line communication.

  As the processing in the second direction, the first reception filter 74 a receives the network signal from the first transformer 44. The first reception filter 74a is a band limiting filter and limits the band of the input network signal. The first reception amplifying unit 76a amplifies the network signal band-limited by the first reception filter 74a and outputs it to the second PHY unit 36. Signals to be processed in the first reception filter 74a and the first reception amplification unit 76a are signals in the PLC. The second reception filter 74b receives the network signal from the second transformer 54. The second reception filter 74b is a band limiting filter and limits the band of the input network signal. The second reception amplifying unit 76b amplifies the network signal band-limited in the second reception filter 74b and outputs it to the second PHY unit 36. Signals to be processed in the second reception filter 74b and the second reception amplification unit 76b are signals in dedicated line communication. Returning to FIG.

  A coupler is configured by combining the first transformer 44 and the coupling capacitor 46. The coupler is connected to the first terminal 48, and the first terminal 48 can be connected to the power line 16. The first transformer 44 receives a network signal from the analog processing unit 42 as processing in the first direction. The first transformer 44 superimposes the network signal on the power on the power line 16. Here, one of the two signal lines to the first terminal 48 is grounded. Therefore, one of the two signal lines is grounded and the other is a single voltage. On the other hand, as a process in the second direction, the first transformer 44 extracts a network signal from the power on the power line 16 and the power on which the network signal is superimposed. The first transformer 44 outputs a network signal to the analog processing unit 42.

  By such processing in the first direction, the network signal is transmitted from the first terminal 48 to the power line 16 via the power plug 50 and the power outlet 52. On the other hand, the network signal is received by the first terminal 48 from the power line 16 through the power plug 50 and the power outlet 52 by the processing in the second direction.

  The second transformer 54 is connected to the second terminal 56, and the second terminal 56 can be connected to the dedicated line 18. The second transformer 54 receives the network signal from the analog processing unit 42 as the processing in the first direction. The second transformer 54 converts the input signal into a differential signal and outputs the differential signal to the second terminal 56. Here, since the differential signal is transmitted through the two signal lines to the second terminal 56, the two signal lines are grounded. On the other hand, the second transformer 54 receives the differential signal from the second terminal 56 and converts it as processing in the second direction. The second transformer 54 outputs the converted signal to the analog processing unit 42.

  By such processing in the first direction, a network signal that is a differential signal is transmitted from the second terminal 56 to the dedicated line 18. On the other hand, a network signal that is a differential signal is received from the dedicated line 18 to the second terminal 56 by the processing in the second direction. The control unit 38 controls operations for the MAC unit 34, the second PHY unit 36, and the analog processing unit 42.

  This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of any computer, and in terms of software, it can be realized by a program loaded in the memory, but here it is realized by their cooperation. Draw functional blocks. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms only by hardware, or by a combination of hardware and software.

  According to the embodiment of the present invention, when the signal formats in the two types of networks are common, only the power of the transmission signal is changed, so that the circuit scale can be increased while supporting the two types of networks. Can be suppressed. In addition, since the signal formats in the two types of networks are common, it is possible to share a circuit before amplification by an analog circuit. In addition, since the circuit up to amplification by the analog circuit is shared, an increase in cost can be suppressed. Moreover, since the transmission amplifying unit is provided so as to correspond to each of the two types of networks and the amplification factors thereof are made different, the power of the transmission signal can be changed. In addition, since a transmission amplification unit and a reception amplification unit are provided for each network, independent analog processing can be executed for each network.

  The outline of one embodiment of the present invention is as follows. The communication device 10 according to an aspect of the present invention includes a first terminal 48 that can be connected to the power line 16 and a second terminal 56 that can be connected to a dedicated line 18 different from the power line 16 to which the first terminal 48 can be connected. Prepare. The power of the signal transmitted from the first terminal 48 to the other communication device 10 connected via the power line 16 is transmitted from the second terminal 56 to the other communication device 10 connected via the dedicated line 18. Unlike the power of the transmitted signal, the format of the signal transmitted from the first terminal 48 to the other communication apparatus 10 connected via the power line 16 is connected from the second terminal 56 via the dedicated line 18. This is the same as the format of signals transmitted to other communication devices 10.

  A first transmission amplification unit 72 a that outputs a signal to the first terminal 48 and a second transmission amplification unit 72 b that outputs a signal to the second terminal 56 may be further provided. The amplification factor in the first transmission amplification unit 72a may be different from the amplification factor in the second transmission amplification unit 72b.

  The communication device 10, the power line 16, the dedicated line 18, and another communication device 10 may be provided.

(Example 2)
Next, Example 2 will be described. As in the first embodiment, the second embodiment relates to a communication system capable of executing PLC and leased line communication. In the second embodiment, in order to reduce the circuit scale as compared with the first embodiment, the two receiving amplifying units provided in the first embodiment are shared. The communication system 100 and the communication device 10 according to the second embodiment are of the same type as those shown in FIGS. Here, it demonstrates centering on the difference with Example 1. FIG.

  FIG. 5 shows a configuration of the analog processing unit 42 according to the second embodiment of the present invention. The analog processing unit 42 includes a transmission filter 70, a first transmission amplification unit 72 a collectively referred to as a transmission amplification unit 72, a second transmission amplification unit 72 b, a reception filter 74, a reception amplification unit 76, and an adjustment unit 78. including. The transmission filter 70 and the transmission amplifying unit 72 execute the same processing as in FIG.

  One end 80 side of the adjustment unit 78 is connected to a point P1 between the second transmission amplification unit 72b and the second transformer 54. The other end 82 side of the adjustment unit 78 is connected to the reception filter 74, and the reception filter 74 connects the opposite side of the side connected to the adjustment unit 78 to the reception amplification unit 76. Further, a point P2 between the other end 82 side of the adjustment unit 78 and the reception filter 74 and a point P3 between the first transmission amplification unit 72a and the first transformer 44 are connected. With such a configuration, one reception filter 74 and one reception amplification unit 76 are arranged, but the path from the first transmission amplification unit 72a to the first transformer 44 and the second transmission amplification unit 72b are arranged. To the second transformer 54 is connected. That is, these routes are connected by a route connecting point P1, point P2, and point P3.

  With this connection, the network signal of the PLC and the network signal of the dedicated line communication can interfere with each other in the processing in the first direction. As described above, the amplification factor in the first transmission amplifying unit 72a is set smaller than the amplification factor in the second transmission amplifying unit 72b according to the regulation of the transmission power between the PLC and the dedicated line communication. Therefore, the influence of the PLC network signal on the leased line communication signal is small, but the influence of the leased line communication network signal on the PLC network signal increases. In order to reduce the influence of the latter, the adjustment part 78 is arrange | positioned.

  The adjustment unit 78 is configured by an attenuator, and attenuates the network signal input from the one end 80 side and the network signal from the second transmission amplification unit 72b in the processing in the first direction. The attenuation amount may be set in advance by experiment, simulation, or the like so that the influence on the PLC network signal does not become a problem. The adjustment unit 78 outputs the attenuated network signal from the other end 82. The attenuated network signal passes through point P2, and then joins the PLC network signal at point P3.

  On the other hand, in the processing in the second direction, the PLC network signal input from the first transformer 44 is input to the reception filter 74 via the points P3 and P2. The network signal for leased line communication input from the second transformer 54 is input to the reception filter 74 via the point P1, the adjustment unit 78, and the point P2. At this time, the attenuation amount of the adjusting unit 78 is small by the control unit 38 and is set to “0”, for example. The reception filter 74 and the reception amplification unit 76 perform the same processing as in FIG.

  According to the embodiment of the present invention, the adjustment unit is provided in the path connecting the path from the first transmission amplification unit to the first transformer and the path from the second transmission amplification unit to the second transformer. The power leaked to network communication can be reduced. Moreover, since the power leaked to other network communications is reduced, deterioration of communication quality can be suppressed. In addition, since the dedicated line communication signal is attenuated, the influence on the PLC can be reduced. In addition, since the adjustment unit is provided, the reception filter and the reception amplification unit can be shared. In addition, since the reception filter and the reception amplification unit are shared, an increase in circuit scale can be suppressed.

  The outline of one embodiment of the present invention is as follows. An adjustment unit 78 connected at one end 80 side between the second transmission amplification unit 72b and the second terminal 56 and a reception amplification unit 76 connected at the other end 82 side of the adjustment unit 78 are further provided. Good. Between the first transmission amplifying unit 72a and the first terminal 48, and between the other end 82 side of the adjusting unit 78 and the receiving amplifying unit 76, the amplification factor in the first transmission amplifying unit 72a is connected. Is smaller than the amplification factor in the second transmission amplification unit 72b, and the adjustment unit 78 attenuates the signal from the one end 80 side and attenuates the signal from the second transmission amplification unit 72b. You may output from the end 82 side.

(Example 3)
Next, Example 3 will be described. The third embodiment relates to a communication system capable of executing PLC and leased line communication as before. In the third embodiment, in order to reduce the circuit scale more than before, the two transmission amplifying units provided in common are shared. The communication system 100 and the communication device 10 according to the third embodiment are the same type as those in FIGS. Here, it demonstrates centering on the difference with Example 1. FIG.

  FIG. 6 shows a configuration of the analog processing unit 42 according to the third embodiment of the present invention. The analog processing unit 42 includes a transmission filter 70, a transmission amplification unit 72, a reception filter 74, a reception amplification unit 76, and an adjustment unit 78. The transmission filter 70 performs the same processing as the transmission filter 70 of FIG. 4, and the transmission amplification unit 72 performs the same processing as the second transmission amplification unit 72b of FIG. That is, the amplification factor of the transmission amplifying unit 72 is set in accordance with the regulation of transmission power in dedicated line communication.

  The transmission amplifier 72 outputs the amplified network signal to the second transformer 54 in the processing in the first direction. One end 80 side of the adjustment unit 78 is connected to a point P <b> 1 between the transmission amplification unit 72 and the second transformer 54. The other end 82 side of the adjustment unit 78 is connected to the reception filter 74, and the reception filter 74 connects the opposite side of the side connected to the adjustment unit 78 to the reception amplification unit 76. Further, a point P <b> 2 between the other end 82 side of the adjustment unit 78 and the reception filter 74 is connected to the first transformer 44. The network signal output from the transmission amplifier 72 is not only input to the second transformer 54 but also input to the adjustment unit 78 via the point P1.

  In the processing in the first direction, the adjustment unit 78 attenuates the network signal input from the one end 80 side and from the transmission amplification unit 72. The attenuation amount is a value such that the transmission power of the network signal satisfies the regulation of the transmission power of the PLC. The adjustment unit 78 outputs the attenuated network signal from the other end 82. The attenuated network signal is output to the first transformer 44 via the point P2.

  On the other hand, in the processing in the second direction, the PLC network signal input from the first transformer 44 is input to the reception filter 74 via the point P2. The network signal for leased line communication input from the second transformer 54 is input to the reception filter 74 via the point P1, the adjustment unit 78, and the point P2. At this time, the attenuation amount of the adjusting unit 78 is small by the control unit 38 and is set to “0”, for example. The reception filter 74 and the reception amplification unit 76 perform the same processing as the processing in FIG.

  According to the embodiment of the present invention, since the adjustment unit is provided between the transmission amplification unit and the second transformer, the transmission amplification unit for the two network communications can be shared. In addition, since the transmission amplifying unit for the two network communications is shared, an increase in circuit scale can be suppressed. In addition, since only one amplifying unit is arranged in each of the transmission system and the reception system, an increase in circuit scale can be suppressed.

  The outline of one embodiment of the present invention is as follows. A transmission amplifying unit 72 that outputs a signal to the second terminal 56, an adjustment unit 78 having one end 80 connected between the transmission amplifying unit 72 and the second terminal 56, and the other end 82 side of the adjustment unit 78. A reception amplifying unit 76 connected may be further provided. The other end 82 side of the adjusting unit 78 and the receiving amplifying unit 76 are connected to the first terminal 48, and the adjusting unit 78 is a signal input from the one end 80 side and from the transmitting amplifying unit 72. May be attenuated and output from the other end 82 side.

  In the above, this invention was demonstrated based on the Example. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to each of those constituent elements or combinations of processing processes, and such modifications are also within the scope of the present invention. .

  In the first to fifth embodiments, the first network is the power line 16 and the second network is the dedicated line 18. However, the present invention is not limited to this. For example, as long as the first network and the second network have the same packet signal format, a wireless line, a coaxial cable, or the like may be used. According to this modification, various networks can be used.

  DESCRIPTION OF SYMBOLS 10 Communication apparatus, 12 Internet, 14 PC, 16 Power line, 18 Dedicated line, 20 Circuit module, 22 Switching power supply, 30 RJ, 32 1st PHY part, 34 MAC part, 36 2nd PHY part, 38 Control part, 42 Analog processing part , 44 first transformer, 46 coupling capacitor, 48 first terminal, 50 power plug, 52 power outlet, 54 second transformer, 56 second terminal, 70 transmission filter, 72 transmission amplifier, 74 reception filter 76 receiving amplifier, 78 adjusting unit, 80 one end, 82 other end, 100 communication system.

Claims (5)

A first terminal connectable to the first network;
A second terminal connectable to a second network different from the first network connectable to the first terminal;
The power of the signal transmitted from the first terminal to the other communication device connected via the first network is the power of the signal transmitted from the second terminal to the other communication device connected via the second network. Unlike the power of the transmitted signal,
The format of the signal transmitted from the first terminal to the other communication device connected via the first network is the same as the format of the signal transmitted from the second terminal to the other communication device connected via the second network. A communication apparatus having the same format as a signal transmitted thereto. A first transmission amplifier for outputting a signal to the first terminal;
A second transmission amplifier for outputting a signal to the second terminal;
The communication apparatus according to claim 1, wherein an amplification factor in the first transmission amplification unit is different from an amplification factor in the second transmission amplification unit. An adjustment unit having one end connected between the second transmission amplification unit and the second terminal;
A receiving amplifying unit connected to the other end of the adjusting unit;
Between the first transmission amplifier and the first terminal, and between the other end of the adjustment unit and the reception amplifier,
The amplification factor in the first transmission amplification unit is smaller than the amplification factor in the second transmission amplification unit,
3. The communication apparatus according to claim 2, wherein the adjustment unit attenuates the signal from the second transmission amplification unit that is a signal input from one end side and outputs the signal from the other end side. . A transmission amplifier for outputting a signal to the second terminal;
An adjustment unit having one end connected between the transmission amplification unit and the second terminal;
A receiving amplifying unit connected to the other end of the adjusting unit;
Between the other end side of the adjustment unit and the reception amplification unit is connected to the first terminal,
The communication apparatus according to claim 1, wherein the adjustment unit is a signal input from one end side, attenuates the signal from the transmission amplification unit, and outputs the signal from the other end side. The communication device according to any one of claims 1 to 4,
A first network;
A second network;
The other communication device;
A communication system comprising:

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