JP2000252888A - Ethernet (registered, trademark) adapter device using house power wiring as transmission line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compose a network of network equipment using Ethernet, without any Ethernet-dedicated transmission line by detecting an AC data signal on a house power wire with a voltage close to the maximum value of a full-wave rectified signal in three states of presence, absence, and collision. SOLUTION: A mixed AC signal waveform is inputted from a house power wire 1 to a high-pass filter 7, and an AC source voltage signal waveform is subtracted to obtain an amplified AC data signal waveform. This is inputted to an attenuator 8 and attenuated with the amplification factor of an amplifier 17 of an output circuit 4 to obtain an AC data signal waveform, which is inputted to a data absence comparator 11, a data presence voltage comparator 11, and a data collision voltage comparator 12 and is compared with a voltage close to the maximum voltage value of the waveform. Then the three states of data presence and absence, and collision on the house power wire 1 are detected. The detected states are inputted to an existent Ethernet adapter circuit 5 through a data control line 19 and are used as the criterion for CSMA/CD transmission control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Ethernet adapter device which uses a power supply indoor wiring as a transmission line, follows a CSMA / CD control system as a transmission control system, and realizes the control system using an AC signal. is there.

[0002]

2. Description of the Related Art A conventional Ethernet adapter device requires a dedicated transmission line. For this reason, when installing equipment using Ethernet in an environment where a dedicated transmission line is not laid, it has to be laid together with the dedicated transmission line.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power supply system in which an indoor power supply wiring is connected to an Ethernet power supply so that network equipment utilizing the Ethernet can easily construct a network in an environment in which a dedicated Ethernet transmission line is not laid. An object of the present invention is to provide an Ethernet adapter device used as a transmission line.

[0004]

SUMMARY OF THE INVENTION The present invention comprises a transmitting means, a receiving means, and a CSMA / CD detecting means in addition to the existing means for controlling CSMA / CD transmission by digital signals. Means for converting Ethernet communication data, which is a digital signal, into an AC signal (hereinafter AC data signal), means for amplifying the AC data signal, and mixing the AC data signal with an AC power supply voltage signal to form a mixed AC signal Means for converting and transmitting the AC data signal from the mixed AC signal input from the power supply indoor wiring, a means for attenuating the AC data signal, and a means for attenuating the AC data signal. Means for converting a signal into a digital data signal.
/ CD detecting means for extracting an AC data signal from the mixed AC signal input from the power supply indoor wiring, means for attenuating the AC data signal, means for performing full-wave rectification on the AC data signal, and means for performing full-wave rectification on the AC data signal. With the voltage near the maximum value of the signal, the state of the AC data signal on the power supply indoor wiring has data,
This is an Ethernet adapter device that uses a power supply indoor wiring as a transmission line and includes means for detecting in three states of no data and data collision.

In the present invention, the conversion time when the means for converting Ethernet communication data, which is a digital signal, into an AC data signal converts one bit in the digital signal into an AC data signal is expressed by the following equation (10). The AC signal representing 0 in the digital signal is represented by the following equation 1.
An AC signal represented by 2 and representing 1 in a digital signal is converted as represented by the following Expression 13.

[0006]

Tc = 1 / (2 × f) (Equation 1) Tc: Conversion time f: Frequency of power supply voltage signal

[0007]

Es = V × sin (ω × t) (Equation 2) Es: power supply voltage signal V: maximum voltage of power supply voltage f: frequency of power supply voltage signal t: time ω: 2 × π × f

[0008]

E0 = e × sin (A × ω × t + ψ0) (Equation 3) AC signal representing E0: 0 e: Modulation signal voltage ψ0: Phase difference with respect to Es A: Arbitrary constant

[0009]

E1 = e × sin (9 × A × ω × t + ψ1) (Equation 4) AC signal representing E1: 1 ψ1: phase difference with respect to Es

In the present invention, the means for mixing the AC data signal with the AC power supply voltage signal is such that the mixing of the AC data signal and the power supply voltage signal is represented by Equations (5) and (6). , In Equation 5, $ 0 in E0
Is 0 or π / 2, and the following Expressions 2, 4, and 6
Is characterized in that ψ1 in E1 is 0 or π / 2.

[0011]

E0s = E0 + Es (Equation 5) E0s: 0-wave mixed AC signal

[0012]

E1s = E1 + Es (Equation 6) E1s: One-wave mixing AC signal

[0013]

E0 = e × sin (A × ω × t + ψ0) (Equation 3) AC signal representing E0: 0 e: Modulation signal voltage ψ0: Phase difference with respect to Es A: Arbitrary constant ω: 2 × π × ff: frequency of power supply voltage signal t: time

[0014]

E1 = e × sin (9 × A × ω × t + ψ1) (Equation 4) AC signal representing E1: 1 ψ1: phase difference with respect to Es

[0015]

Es = V × sin (ω × t) (Equation 2) Es: power supply voltage signal V: maximum voltage of power supply voltage

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG.
(A personal computer incorporating a network protocol such as TCP / IP or a computer incorporated in an electric appliance or the like) is connected to the Ethernet adapter device 21 via the control line and the communication data signal line 6 to transmit and receive Ethernet data.

The Ethernet adapter device 21 is configured as shown in FIG. 1, and four processing portions of a CSMA / CD detection circuit 2, a signal input circuit 3, a signal output circuit 4, and an existing Ethernet adapter circuit 5 use an AC signal. The point of the present invention is that CSMA / CD transmission is performed on the power supply indoor wiring 1.

CSMA / CD transmission control is based on IEEE802.
This is a transmission control for Ethernet defined in No. 3 and used in digital lines.

The CSMA / CD detection circuit 2 will be described with reference to FIGS. The CSMA / CD detection circuit 2 includes a high-pass filter 7, an attenuator 8, a full-wave rectifying filter 9, a voltage comparator without data 10, a voltage comparator with data 11, and a data collision voltage comparator 12. The mixed AC signal waveform 23 is input from the power supply indoor wiring 1 to the high-pass filter 7. In the high-pass filter 7, the mixed AC signal waveform 23
Is subtracted from the AC power supply voltage signal waveform 24 and converted into an amplified AC data signal waveform 25. The amplified AC data signal waveform 25 is input to the attenuator 8 and is output from the amplifier 17 in the output circuit 4.
, And the AC data signal waveform 26
Is converted to The AC data signal waveform 26 is input to the full-wave rectification filter 9 and is converted into a full-wave rectification waveform 27.
The full-wave rectified waveform 27 is input to each of the voltage comparator 10 without data, the voltage comparator 11 with data, and the data collision voltage comparator 12, and is compared with a voltage near the maximum voltage value of the waveform. Three states of no data, data present, and data collision are detected. At this time, the detection voltage of the voltage comparator 10 without data is 0 (V), and the detection voltage of the voltage comparator 11 with data is e in Expressions 3 and 4.
(V), and the detection voltage in the data collision voltage comparator 12 is 2 × e (V). The detected state is transmitted to the existing Ethernet adapter circuit 5 through the data control line 19.
And is used as a reference for determination of CSMA / CD transmission control.

The signal output circuit 4 will be described with reference to FIGS. The signal output circuit 4 and the existing Ethernet adapter circuit 5 are connected by a data bus 20 and a data control line 19. The signal output circuit 4 includes an FSK modulator 18, an amplifier 17,
The tuner 16 is provided. A digital data signal waveform 27 is input from the existing Ethernet adapter circuit 5 through the data bus 20 to the signal output circuit 4, and a conversion start command is input through the data control line 19. The signal output circuit 4 thereby obtains the digital data signal waveform 2
7 is converted into a mixed AC signal waveform 31 and transmitted to the power supply indoor wiring 1. The process of conversion is described as follows. The digital data signal waveform 27 input from the existing Ethernet adapter circuit 5 is input to the FSK modulator 18.
In the FSK modulator 18, the digital data signal waveform 27
To the AC data signal waveform 28. The FSK modulation (modulation) method is a method for converting a digital signal into an AC signal, and is an existing modulation (modulation) method. In the present invention, F
In the SK modulator 18, the conversion time in the modulation from the 1-bit digital signal waveform 32 in the OFF state to the zero wave 34 and the modulation in the modulation from the 1-bit digital signal waveform 33 in the ON state to the one wave 35 are represented by Expression 1. Are conversion times 36 and 37, which are 1/1 of the power supply voltage signal waveform.
Equal to two cycle times 38. The AC data signal waveform 28 is input to the amplifier 18, amplified at an arbitrary amplification factor B, and converted into an amplified AC data signal waveform 29. The amplified AC data signal waveform 29 is input to the tuner 16 and mixed with the power supply voltage signal waveform 30. At this time, the 0-wave 34 and the 1-wave 35 are adjusted so that the power supply voltage signal waveform 30 is mixed at the point where the power voltage signal waveform 30 intersects with 0 V, and becomes a mixed AC signal waveform 31.

The signal input circuit 3 will be described with reference to FIGS. The signal input circuit 3 and the existing Ethernet adapter circuit 5 are connected by a data bus 20 and a data control line 19. The signal input circuit 3 includes a high-pass filter 13, an attenuator 14, and an FSK demodulator 15. The mixed AC signal waveform 39 input to the signal input circuit 3 from the power supply indoor wiring 1 is converted into a digital data signal waveform 43.
The signal input circuit 3 supplies a digital data signal waveform 43 to the existing Ethernet adapter circuit 5 through the data bus 20.
And reports the end of the conversion via the data control line 19. The process of conversion is described as follows. The mixed AC signal waveform 39 is supplied from the power supply indoor wiring 1 to the high-pass filter 13.
Is input to In the high-pass filter 13, the power supply voltage signal waveform 40 whose signal cycle is less than A × f (Hz) in Expressions 3 and 4 is removed, and is converted into an amplified AC data signal waveform 41. The amplified AC data signal waveform 41 is input to the attenuator 14 and attenuated, and the AC data signal waveform 42
Is converted to The rate of attenuation is equal to the amplification factor B specified for the amplifier 17 of the output circuit 5. The AC data signal waveform 42 attenuated by the attenuator 14 is input to the FSK demodulator 15. In the FSK demodulator 15, the AC data signal waveform 4
2 is converted into a digital data signal waveform 43, and this signal is input to the existing Ethernet adapter circuit 5.

[0023]

According to the present invention, in an environment where a dedicated Ethernet transmission line is not laid, network equipment using Ethernet can easily construct a network.
The power supply indoor wiring can be used as an Ethernet transmission line.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of data processing.

FIG. 2 is a CSMA / CD detection process using an AC signal.

FIG. 3 is a digital / AC signal conversion power supply voltage signal mixing process.

FIG. 4 is an AC / digital signal conversion process for removing a power supply voltage signal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply indoor wiring 2 CSMA / CD detection circuit 3 Signal input circuit 4 Signal output circuit 5 Existing Ethernet adapter circuit 6 Control line and communication data signal line 7 High-pass filter 8 Attenuator 9 Full-wave rectification filter 10 Data-less voltage comparator 11 Voltage comparator with data 12 Data collision voltage comparator 13 High-pass filter 14 Attenuator 15 FSK demodulator 16 Tuner 17 Amplifier 18 FSK modulator 19 Data control line 20 Data bus 21 Ethernet adapter 22 External CPU 23 Mixed AC signal waveform 24 Power supply voltage signal waveform 25 Amplified AC data signal waveform 26 AC data signal waveform 26 Full-wave rectified waveform 27 Digital data signal waveform 28 AC data signal waveform 29 Amplified AC data signal waveform 30 Power supply voltage signal waveform 31 Mixed AC signal waveform 3 2 1-bit digital signal waveform in OFF state 33 1-bit digital signal waveform in ON state 34 0 wave 35 1 wave 36 Conversion time 37 Conversion time 38 1/2 cycle time of power supply voltage signal waveform 39 Mixed AC signal waveform 40 Power supply voltage signal Waveform 41 Amplified AC data signal waveform 42 AC data signal waveform 43 Digital data signal waveform

Claims (3)

[Claims] 1. A transmission means, a reception means, and a CSMA / CD detection means, in addition to the existing means for controlling CSMA / CD transmission control by a digital signal, wherein the transmission means is a digital signal Ethernet communication. Means for converting data into an AC signal (hereinafter AC data signal); means for amplifying the AC data signal; mixing the AC data signal with an AC power supply voltage signal to convert it into a mixed AC signal; The receiving means comprises means for extracting an AC data signal from a mixed AC signal input from the power supply indoor wiring, means for attenuating the AC data signal, and conversion of the AC data signal into a digital data signal. Means for extracting an AC data signal from the mixed AC signal input from the power supply indoor wiring; Means for attenuating the alternating data signal;
Means for full-wave rectifying the AC data signal, and means for detecting the state of the AC data signal on the power supply indoor wiring in three states of data presence, no data, and data collision by a voltage near the maximum value of the full-wave rectification signal An Ethernet adapter device that uses power supply indoor wiring as a transmission line. 2. The means for converting Ethernet communication data, which is a digital signal, into an AC data signal, the conversion time for converting one bit in the digital signal into an AC data signal is represented by the following equation 1. 2. The power supply indoor wiring according to claim 1, wherein the AC signal representing 0 in the signal is represented by the following expression 3, and the AC signal representing 1 in the digital signal is converted as represented by the following expression 4. Ethernet adapter device used as a transmission path. Tc = 1 / (2 × f) (Equation 1) Tc: Conversion time f: Frequency of power supply voltage signal Es = V × sin (ω × t) (Equation 2) Es: Power supply voltage Signal V: Maximum voltage of power supply voltage f: Frequency of power supply voltage signal t: Time ω: 2 × π × f E0 = e × sin (A × ω × t + ψ0) (Equation 3) E0: 0 AC signal e: Modulation signal voltage ψ0: Phase difference with respect to Es A: Arbitrary constant E1 = e × sin (9 × A × ω × t + ψ1) (Equation 4) AC signal representing E1: 1 : Phase difference with respect to Es 3. The means for mixing an AC data signal with an AC power supply voltage signal, wherein the mixing of the AC data signal and the power supply voltage signal is represented by Equations (5) and (6). Ψ0 in E0 is 0 or π
/ 2, and E1 in Equations 2, 4 and 6 below
2. The Ethernet adapter device according to claim 1, wherein ψ1 is 0 or π / 2. E0s = E0 + Es (Equation 5) E0s: 0-wave mixed AC signal E1s = E1 + Es (Equation 6) E1s: One-wave mixed AC signal E0 = e × sin (A × ω × t + ψ0) (Equation 3) AC signal representing E0: 0 e: Modulation signal voltage ψ0: Phase difference with respect to Es A: Arbitrary constant f: Frequency of power supply voltage signal t: Time ω: 2 × π × f E1 = e × sin (9 × A × ω × t + ψ1) (Equation 4) AC signal representing E1: 1 ψ1: phase difference with respect to Es Es = V × sin (ω × t) (Equation 2) Es: power supply voltage signal V: maximum voltage of power supply voltage