WO2007139422A1 - Système destiné à la transmission d'informations en duplex utilisant une ligne de communication à double fil - Google Patents

Système destiné à la transmission d'informations en duplex utilisant une ligne de communication à double fil Download PDF

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Publication number
WO2007139422A1
WO2007139422A1 PCT/RU2006/000277 RU2006000277W WO2007139422A1 WO 2007139422 A1 WO2007139422 A1 WO 2007139422A1 RU 2006000277 W RU2006000277 W RU 2006000277W WO 2007139422 A1 WO2007139422 A1 WO 2007139422A1
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WO
WIPO (PCT)
Prior art keywords
output
input
transformer
amplitude
communication line
Prior art date
Application number
PCT/RU2006/000277
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English (en)
Russian (ru)
Inventor
Alexander Viktorovich Shadrin
Original Assignee
Federalnoe Gosudarstvennoe Unitarnoe Predpriyatie 'rosysky Federalny Yaderny Tstentr - Vserossysky Nauchno-Issledovatelsky Institut Tekhnicheskoi Fiziki Akademika E.I. Zababakhina'
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Publication date
Application filed by Federalnoe Gosudarstvennoe Unitarnoe Predpriyatie 'rosysky Federalny Yaderny Tstentr - Vserossysky Nauchno-Issledovatelsky Institut Tekhnicheskoi Fiziki Akademika E.I. Zababakhina' filed Critical Federalnoe Gosudarstvennoe Unitarnoe Predpriyatie 'rosysky Federalny Yaderny Tstentr - Vserossysky Nauchno-Issledovatelsky Institut Tekhnicheskoi Fiziki Akademika E.I. Zababakhina'
Priority to RU2008126119/09A priority Critical patent/RU2381627C1/ru
Priority to PCT/RU2006/000277 priority patent/WO2007139422A1/fr
Publication of WO2007139422A1 publication Critical patent/WO2007139422A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0266—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling
    • H04L25/027—Arrangements for providing Galvanic isolation, e.g. by means of magnetic or capacitive coupling specifically for telegraph signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/0335—Arrangements for removing intersymbol interference characterised by the type of transmission
    • H04L2025/03356—Baseband transmission

Definitions

  • the technical field The invention relates to the field of information transmission via wire lines and can be used for lines up to 3000 meters or more in length and is intended primarily for use in information collection and processing systems with a central point and remote peripheral terminals, including security systems with their high requirements for the reliability of communication channels.
  • State of the art is intended primarily for use in information collection and processing systems with a central point and remote peripheral terminals, including security systems with their high requirements for the reliability of communication channels.
  • relatively large computer systems or similar information processing complexes comprise one or more central computers that communicate with a variety of peripheral devices. Often, such devices are located at a distance of several hundred or thousands of meters from the computer. With a long length of communication lines, various problems arise due to shape distortion and signal attenuation. If the link is poorly matched, there may be failures at the ends due to signal reflections. In addition, long communication lines make it difficult to use a single power source for central and remote devices. Therefore, each device must be equipped with its own power source.
  • two pairs of wires are usually used, a pair for each direction.
  • the allocation of four wires is quite expensive. Therefore, two-wire systems were proposed in which the same pair of wires is used alternately: during the first time interval for transmitting information in one direction, during the second time interval for transmitting information in the other direction. In such a configuration, the total information transfer rate can only be saved by doubling the transfer rate of each device.
  • duplex two-wire systems that allow the simultaneous transmission and reception of information.
  • two-wire systems are known, equipped with schemes for separating received and transmitted signals, described, for example, in USSR author's certificate N ° 564728 "Device for duplex signal transmission", authors G.D. Davydov, N.M. Chernigin, V.N. Titov, V.N. Egorov. MQK H 04 L 5/14 published 07/01/07, Bulletin N ° 25, and in the USSR author's certificate N ° 1264362 "Device for duplex signal transmission", authors V.G. Osipov, I.K. Safonov.
  • a duplex system is known, equipped with a circuit for suppressing transmitted signals in the receiving path, described in US Pat.
  • Adolf, Assigpeee Siemeps Aktiepgessellshaf (Mupish, Germapu), Ipt. Cl. H 04 L 5/14, Date: March 15, 1977.
  • This system uses bridge separation circuits with balancing resistances.
  • interruptions in the reception of information are possible due to insufficient suppression of the transmitted signals at the receiver input, as well as due to interference in the communication line.
  • duplex tripsmiss mesapism for digital digit telepopes ipptors: Dapel C. Umpa, Assigpee: ITT Corroratiop (New York, USA), Ipt. Cl. H 04 In 1/56, Priority date: JuIy 1, 1986. This system is selected as a prototype.
  • the prototype uses a biphasic coding method with a zero value of the constant component. This allows the use of galvanic transformer isolation of system devices with a communication line. Suppression schemes are made using complex resistive circuits.
  • the system allows power to be supplied to the remote device through the same communication line. However, this system is designed for relatively short lines of the order of 2,000 feet (0.6 km). Such short lines create a slight attenuation and distortion of the waveform and, since the resistive voltage drop is relatively small, power can be supplied from one end of the line to the other.
  • the length of communication lines can reach 3 km. In communication lines with a length of more than 0.6 km, the system performance drops sharply. It may fail to receive information due to insufficient suppression of the transmitted signals at the receiver input, as well as due to incorrect restoration of the waveform and additional distortion of the waveform caused by the magnetization of the transformer cores by the power supply current of the remote device.
  • the objective of the invention is the creation of a simple and reliable duplex two-wire communication system for long lines, intended primarily for use in information collection and processing systems with a central point and remote peripheral terminals, including security systems.
  • the technical result that allows us to solve the problem lies in a higher degree of suppression of the transmitted signal at the input of the receiver, restoration of the shape and amplitude of the signal distorted by the communication line, and maintaining the operability of transformers that provide galvanic isolation of devices from communication lines.
  • the encoders are equipped with an additional output, on which a signal is generated necessary to suppress the transmitted signal at the input of the receiving path, decoders made according to the scheme using analog filtering of decoded signals, the receiving path of each receiving and transmitting device is equipped with an amplitude-frequency correction device, the suppression device at the input of the receiving tract of
  • the central device has a power supply voltage for the remote device in the middle of the transformer output winding
  • the remote device has the power supply removed from the middle of the transformer output winding and applied to the converter generating voltage required to power the remote device.
  • the most optimal implementation of the device is the amplitude-frequency correction in the form of an amplifier, the output of which is connected in series with the first resistor, the first capacitor and the input of the operational amplifier, which is bridged with its output through the second resistance, a tuning resistor is connected to the output of the amplifier, the control input of which is connected through cut a parallel circuit from the third resistor and the fourth resistor and the second capacitor connected in series to the connection point of the first torus and the first capacitor, and the second input of the operational amplifier is grounded.
  • the suppression device at the input of the receiving path of the transmitted signal can be made in the form of an operational amplifier, the non-inverting input of which is connected to the connection point of the transformer primary winding with a two-terminal, the inverting input is connected through resistors to an additional output of the encoder and the output of the operational amplifier, and the output of the operational amplifier is connected with the input of the device of the amplitude-frequency correction.
  • An increase in the length of the communication line entails the following.
  • the longer the communication line the more the amplitude of the received signals decreases and their shape is distorted. This leads to an increase in the probability of decoding errors due to insufficient suppression of the transmitted signal at the decoder input, as well as the effect of interference. Waveform distortion can also lead to incorrect new decoding of signals.
  • the use of noise-resistant decoding schemes requires restoration of the amplitude and shape of the received signal. Therefore, it is necessary to provide better suppression at the input of the receiving path of the transmitted signal, as well as the restoration of the amplitude and shape of the received signals.
  • the two-terminal device determines the line load.
  • Z ' Z% (W 1 AV 2 ) 2 , where W 1 and W 2 are the number of turns in the primary and secondary windings of the transformer, respectively.
  • the restoration of the amplitude and shape of the signals distorted by the communication line is carried out by the device of the amplitude-frequency correction. It is an amplifier, the amplitude-frequency characteristic of which is inverse to the characteristic of the communication line.
  • the device contains a tuning resistor that allows you to adjust the amplitude-frequency response of the device to a specific length of the communication line.
  • the restoration of the amplitude of the signal is carried out using a comparator, which does not allow you to restore the temporal relationships in the signal (i.e., restore the waveform) with large distortions of the waveform introduced by a long line.
  • the ability to supply power to a remote device via a communication line depends on the amount of current consumed by the remote device.
  • This current flows through the windings of the output transformer and, with the indicated connection scheme, leads to the magnetization of the transformer core, which can lead to a violation of the transformer's ability to transmit pulsed information signals without significant distortion.
  • Increasing the length of the communication line leads to an increase in the current flowing through the wires of the communication line, since the voltage supplied to the remote device decreases, and while maintaining the power consumed by the device, the current consumption increases.
  • the power source for the remote device is connected to the middle of the output winding of the transformer of the central transceiver, and in the remote device to the middle of the transformer winding is connected a DC voltage converter that generates the voltage necessary to power the remote device. Due to this inclusion, magnetization of the transformer cores does not occur, which can lead to saturation of the cores and, consequently, to a malfunction of the transformers.
  • Typical Manchester coding is used for synchronous transmission of information when information signals are accompanied by clock signals.
  • the system can also be used to build an asynchronous communication channel, for example, to provide communication between two devices with an RS-232 or NRZ interface. In this case, signals in the communication line are formed only when the value of the transmitted logical signal changes.
  • a device with other circuit solutions can be used, providing duplex mode for the communication line of the required length and supplying power through the communication line.
  • FIG. 1 shows a general diagram of a system for duplex transmission of information over a two-wire communication line.
  • FIG. 2 a typical method of Manchester (biphasic) coding and waveforms at various points of devices.
  • FIG. Figure 3 shows a possible two-terminal circuit for matching the communication line.
  • FIG. 4 shows a possible diagram of an amplitude-frequency correction device providing restoration of the amplitude and shape of a signal distorted due to passage through a long communication line.
  • FIG. 5 shows waveforms when using the system for asynchronous information transfer.
  • FIG. 6 shows a possible diagram of a device for suppressing a transmitted signal at the input of a receiving path.
  • a duplex information transmission system on a two-wire communication line comprises a central device 1 (located, for example, at a central point of the information collection and processing system) and a remote device 5 connected by a line of two wires 3, 4.
  • Devices 1 and 2 contain encoders 5, digital buffer amplifiers b and 7, transformers 8 connected to bipolar 9 (point A), resistors 10 and 11, amplitude-frequency correction devices 12, decoders 13 made according to the scheme using analog filtering, decoding Mykh signals.
  • the amplitude-frequency correction device 12 and the decoder 10 13 form a receiver 14.
  • the remote device 2 contains a voltage Converter 15.
  • the encoder 5 receives information signals TX, followed by the clock pulses TT.
  • the outputs of the encoder 5 (points B and C) are connected to the inputs of the buffer amplifiers 6 and 7, the outputs of which are connected to series-connected
  • the output of the amplitude-frequency correction device 12 (point F) is connected to the input of the decoder 13, made according to the scheme using analog filtering of decoded signals, providing noise-resistant decoding.
  • output information signals RX are generated, accompanied by clock pulses RT. Voltage U DC for power
  • 25 nii remote device is fed into the middle of the output winding of the transformer 8 of the Central transceiver 1.
  • the remote device 2 is basically identical to the central device 1. The difference is the presence of a voltage converter 15, which generates the voltage necessary to power the remote device 2.
  • the supply voltage to the input 30 of the converter 15 is supplied from the middle of the transformer winding 8 connected to the communication line 3 and 4.
  • the diagrams in figure 2 and 5 illustrate the signals: and - the transmitted logical signal (in Fig.
  • TX TX
  • TX TX
  • T is the total duration of the pairs of pulses of the biphasic code (the duration of the bit interval)
  • b is the signal at the input of the buffer amplifier 6 at point B
  • C is the signal at the input of the buffer amplifier 7 at point C
  • d is the signal on the primary winding of the transformer
  • e is the signal at point A
  • g is the transmitted signal after passing through the communication line (point A ')
  • h is the signal at the output of the amplitude-frequency correction device (point F 1 ) of the remote device; i - decoded signal RX 'at the output of the remote device.
  • the system operates as follows. As shown in FIG. l, TX information signals transmitted, followed by TT clocks, are supplied to encoder 5, which generates output signals at points B, C, D shown in FIG. 2 in diagrams b, c, f, respectively. The signals from points B and C are fed to digital buffer amplifiers 6 and 7 with low output impedance and output levels of logic zero and logic unity, close to the zero voltage and supply voltage of these amplifiers, respectively.
  • the signal transmitted in the line has the form shown in FIG. 2 by diagram d.
  • the specified method of signal formation corresponds to the biphasic coding method of Manchester II.
  • the encoded signal in the line changes between two voltage levels Vi and V 2 .
  • the transition between these levels determines the value of the transmitted bit. For example, as shown in FIG. 2d, the transition from V 1 to V 2 corresponds to the binary “1”, while the transition from V 2 to V 1 corresponds to the binary “O”.
  • a transition is created in the middle of the corresponding bit.
  • V 1 - V 2 so that the value of the constant component of the encoded signal is zero.
  • FIG. 3 A possible bipolar circuit 9 providing good results is shown in FIG. 3.
  • the resistors 16, 17, 18, 19 are connected in series, and a capacitor 20 is connected in parallel to the resistors 18 and 19.
  • the total resistance 10 of the resistors 16 and 17 is equal to the high-frequency cable impedance module.
  • Resistors 16, 17, 18 and l9 in combination with a capacitor 20 provide reproduction of the dependence of the resistance of the two-terminal 9 on the frequency in the desired frequency range.
  • Resistors 16 and 19 provide fine tuning for a particular communication line.
  • the device of the amplitude-frequency correction 12 (in Fig. L), providing restoration of the amplitude and shape of the signal distorted due to passage through the communication line 3 and 4, can be performed according to the scheme shown in Fig. 4.
  • the output of the amplifier 21 is connected to the first output of the tuning resistor 22, the second output of which is connected to the ground, and to the first output of the second resistor 23, the second
  • the swarm output of which is connected to the first output of the first capacitor 24 (designed to eliminate the constant component in the output signal of the device for suppressing the transmitted signal), the second output of the capacitor 24 is connected to the inverting input of the operational amplifier 25 and through the third resistor 26 is connected to the output of the operational amplifier 25, movable tuning resistor contact
  • a tuning resistor 22 is made by a tuning resistor 22.
  • the capacitor 24 eliminates the constant voltage component at the output of the amplitude-frequency correction device 12.
  • Resistors 27 and 29, as well as the capacitance of the capacitor 28 are selected so as to provide acceptable quality of restoration of the amplitude and shape of the received signal for the entire range of changes in the length of communication lines 3 and 4.
  • the supply voltage supply through the middle of the transformer winding eliminates the magnetization of the transformer cores 8. To reduce losses in the line, the voltage supplied to the line should be chosen as high as possible.
  • the system of FIG. 1 advantageously uses the biphasic coding method of Manchester P.
  • other coding methods that do not have a constant component are also suitable.
  • signals in the communication line are formed only when the value of the transmitted logical signal changes.
  • a signal view for an asynchronous communication channel is shown in FIG. 5. Clock signals for asynchronous information transfer are not required.
  • resistors 10 and 11 which serve to suppress the transmitted signals at receiver 14
  • the non-inverting input of amplifier 30 is connected to point A
  • the inverting input through resistor 31 is connected to point D
  • resistor 32 to the output of amplifier 30 and to the input of the amplitude-frequency correction device 12 (point E) in FIG. l.
  • an auxiliary signal should be formed when signals appear on any of the buffer amplifiers b or 7 and match with them in value (i.e., if, in the absence of transmission, the initial level at the outputs of buffer amplifiers 6 or 7 is low, then at the additional the output D of the encoder 5 is low, and when any of the amplifiers 6 or 7 appears at the output at a high level, the additional output D must also be set to a high level).
  • the operational amplifier 30 due to the high input impedance of the operational amplifier 30 at the non-inverting input, the effect on matching there is no line, and an even higher degree of suppression of the transmitted signals at the input of the receiver 14 can be achieved (Fig. l).
  • the input amplifier 21 in the device of the amplitude-frequency correction (figure 4) for this option is not needed.
  • the output of the device for suppressing the transmitted signals at the input of the receiver 14 can be connected directly to the connection point of the resistors 22 and 23 of the amplitude-frequency correction device (Fig. 4)
  • the most effective is the use of the proposed system for the duplex transmission of information over a two-wire communication line in the data collection and processing systems of integrated systems of physical protection of objects with their high requirements for the reliability of communication channels.
  • the ability to supply power to a remote device via a communication line avoids laying separate cables to power remote devices.
  • the above embodiments of the invention show its operability.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Dc Digital Transmission (AREA)

Abstract

Selon l'invention, le système comprend des dispositifs (1) et (2) reliés par une linge de communication. On utilise des transformateurs (8) pour assurer l'isolation galvanique entre les dispositifs et la ligne de communication. Les signaux de transmission (TX) sont codés par un codeur (5). Des dispositifs de correction de fréquence et d'amplitude (12) rétablissent l'amplitude et la forme des signaux déformés par la ligne de communication. Le décodeur (13) a été réalisé selon un schéma permettant le filtrage analogique des signaux décodés. Le système s'utiliser pour établir un canal de communication synchrone ou asynchrone dans des systèmes de collecte et de traitement d'informations entre le poste central et les terminaux distants. L'alimentation se fait à partir du dispositif central vers le dispositif distant via la ligne de communication. La longueur de la ligne de communication peut atteindre 3000 m, voire plus.
PCT/RU2006/000277 2006-05-30 2006-05-30 Système destiné à la transmission d'informations en duplex utilisant une ligne de communication à double fil WO2007139422A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
RU2008126119/09A RU2381627C1 (ru) 2006-05-30 2006-05-30 Система для дуплексной передачи информации по двухпроводной линии связи
PCT/RU2006/000277 WO2007139422A1 (fr) 2006-05-30 2006-05-30 Système destiné à la transmission d'informations en duplex utilisant une ligne de communication à double fil

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PCT/RU2006/000277 WO2007139422A1 (fr) 2006-05-30 2006-05-30 Système destiné à la transmission d'informations en duplex utilisant une ligne de communication à double fil

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112202573A (zh) * 2020-09-30 2021-01-08 金华飞光科技有限公司 一种二线制的供电、组网通信系统

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RU2502177C1 (ru) * 2012-05-15 2013-12-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Братский государственный университет" Способ согласования симметричной четырехпроводной линии электропередачи с электрической нагрузкой
RU2502176C1 (ru) * 2012-05-15 2013-12-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Братский государственный университет" Способ согласования неоднородной неизолированной трехпроводной линии электропередачи с электрической нагрузкой
FR2993106B1 (fr) * 2012-07-06 2014-08-01 Sagem Defense Securite Dispositif de raccordement d'un organe electrique a une ligne de communication
RU2511429C2 (ru) * 2012-07-19 2014-04-10 Федеральное государственное унитарное предприятие "Научно-производственный центр автоматики и приборостроения имени академика Н.А. Пилюгина" (ФГУП "НПЦАП") Приемопередатчик последовательного интерфейса с элементом гальванической развязки
RU2537852C2 (ru) * 2012-11-06 2015-01-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Братский государственный университет" Способ согласования четырехпроводной несимметричной линии электропередачи с электрической нагрузкой
RU186467U1 (ru) * 2018-09-13 2019-01-22 Российская Федерация, от имени которой выступает Министерство обороны Российской Федерации Приемопередающее устройство манчестерского кодирования
RU2714224C1 (ru) * 2019-09-10 2020-02-13 Акционерное общество "ПКК МИЛАНДР" Устройство передачи данных с гальванической развязкой посредством импульсного трансформатора

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598396A (en) * 1984-04-03 1986-07-01 Itt Corporation Duplex transmission mechanism for digital telephones
US4918685A (en) * 1987-07-24 1990-04-17 At&T Bell Laboratories Transceiver arrangement for full-duplex data transmission comprising an echo canceller and provisions for testing the arrangement
JPH0653859A (ja) * 1992-07-31 1994-02-25 Nissei Denshi Kogyo Kk 無線送受信機
RU2054803C1 (ru) * 1991-10-08 1996-02-20 Акционерное общество Научно-исследовательский институт "Кром" Устройство дуплексной связи
RU2099884C1 (ru) * 1991-08-22 1997-12-20 Центральное конструкторское бюро Министерства связи Российской Федерации Способ дуплексной передачи цифровой информации по двухпроводной цепи и устройство для его осуществления

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4598396A (en) * 1984-04-03 1986-07-01 Itt Corporation Duplex transmission mechanism for digital telephones
US4918685A (en) * 1987-07-24 1990-04-17 At&T Bell Laboratories Transceiver arrangement for full-duplex data transmission comprising an echo canceller and provisions for testing the arrangement
RU2099884C1 (ru) * 1991-08-22 1997-12-20 Центральное конструкторское бюро Министерства связи Российской Федерации Способ дуплексной передачи цифровой информации по двухпроводной цепи и устройство для его осуществления
RU2054803C1 (ru) * 1991-10-08 1996-02-20 Акционерное общество Научно-исследовательский институт "Кром" Устройство дуплексной связи
JPH0653859A (ja) * 1992-07-31 1994-02-25 Nissei Denshi Kogyo Kk 無線送受信機

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112202573A (zh) * 2020-09-30 2021-01-08 金华飞光科技有限公司 一种二线制的供电、组网通信系统

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