RU2028733C1 - Equipment for multisubscribers' single-channel communication - Google Patents

Abstract

FIELD: communication. SUBSTANCE: equipment for multisubscribers' single-channel communication includes transceiver device 1 incorporating modulates 2 transceiver 3, filter 4, amplitude discriminator 5 and commutator 6, second OR gate 7, former 8, delay element 9, RS flip-flop 10, counter 11, decoder 12, former 13 of priority pulses and unit 14 of control over reception and reproduction composed of group of NOT-AND gates 15-17 for information reconstruction, first and second NOT-AND gates 18, 19, register 20 having control input 21, of third OR gate 22, group of NOT-AND gates 23-26 for reception of information, first OR gate 27, AND gate 28 and distributor 29. EFFECT: provision for capability of control over priority signal of subscribers in process of preparation of messages for transmission and in process of message transmission. 3 dwg

Description

 The invention relates to communications in channels with random access by subscribers and can be used in monitoring and control systems, in computer networks with relatively small interference in the channel.

 A device for multicast single-channel communication containing a transceiver device including a modulator, a transceiver, a filter, an amplitude discriminator and a switching device, a delay element and a control unit for receiving and reproducing, including a register, a pulse distributor, groups of AND-NOT information receiving and reproducing elements, an element And, the first AND-NOT element and the first OR element, the output of the amplitude discriminator of the transceiver device being connected to the first input of the first OR element and the input of the delay element, the output of which is connected to the second inputs of the group of elements of information AND-NOT playback information, the output of the first element OR is connected to the first inputs of the group of elements AND information reception, the first inputs of the group of elements AND information playback and the second inputs of the group of AND elements - NOT receiving information is connected to the outputs of the distributor, the third inputs of the group of AND information elements for reproducing information are connected to the information output of the register, and their outputs are connected to the corresponding inputs of the first element AND NOT, the output of which is connected to the second input of the first AND element, the third inputs of the part of the group of AND reception elements of information are connected to the output of the AND element, whose inputs are connected to the corresponding outputs of the register, the information inputs of which are connected to the outputs of the group of elements AND reception of information, and the outputs the modulator and the switching device are connected to the inputs of the transceiver, the output of which through the filter is connected to the input of the amplitude discriminator.

 This device does not have the ability to control the priority in the process of preparing messages for transmission and in the process of sending messages, as a result of which a subscriber having a low initially set unchanging priority with a high intensity of work of subscribers is unable to gain access to the channel for an unacceptably long time.

 The purpose of the invention is the ability to control the priority signals of subscribers in the process of preparing messages for transmission and in the process of transmitting messages.

 In FIG. 1 shows a diagram of a device; figure 2 and figure 3 are timing diagrams of the signals of the blocks of the device in the receiving mode and in the playback mode, respectively.

 A device for multicast single-channel communication consists of a transceiver 1, including a modulator 2, a transceiver 3, a filter 4, an amplitude discriminator 5 and a switching device 6, from a second element OR 7, a shaper 8, a delay element 9, an RS-trigger 10, a counter 11, of a decoder 12, a priority pulse shaper 13, and a reception and reproduction control unit 14, consisting of a group of AND-NOT elements 15-17 for reproducing information, a first and second AND-NOT elements 18, 19, a register 20 having a control input 21, out of a third of the OR 22 groups of AND-NO elements 22-26 receiving information of the first OR gate 27, AND gate 28 and the distributor 29.

 The inputs of the transceiver 3 are connected to the outputs of the modulator 2 and the switching device 6, the output of the transceiver 3 is connected to the input of the filter 4, the output of which is connected to the input of the amplitude discriminator 5. The output of the amplitude discriminator 5 is connected to the input of the delay element 9, the off input of the RS-trigger 10 and the first the input of the first element OR 27, the output of the delay element 9 is connected to the second inputs of the group of elements AND-NOT 15-17 information, to the first input of the second element AND 19 and to the inverse input of the third element OR 22. The priority outputs of the register 20 are connected to the installation inputs of the counter 11, the information outputs of which are connected to the information inputs of the decoder 12. The information outputs of the register 20 are connected to the third inputs of the group of information elements NAND 15-17, the outputs of which are connected to the inputs of the first element NAND 18. The information inputs of the register 20 are connected to the outputs of the group of AND-NOT elements 23-26 receiving information, and the output of the message transmission of the register 20 is connected to the second input of the second AND-NOT element 19 and the input of the shaper 8. The first inputs of the group of elements AND-NOT 15-17 information playback and the second inputs of the group of elements AND 23-24 information reception are connected to the outputs of the distributor 29, the start input of which is connected to the output of the third element OR 22. Address outputs register 20 connected to the inputs of the element And 28, the output of which is connected to the third inputs of the part of the group of elements AND 23, 24 receiving information. The output of the shaper 8 is connected to the input of the counter 11. The output of the second AND-NOT 19 element is connected to the input of the decoder 12. The output of the first AND-NOT 18 element is connected to the second input of the OR element 27, the input of the RS-trigger 10, and the second input of the second element OR 7. The inverse output of the RS flip-flop 10 is connected to the counting input of the counter 11, and the output of the first element OR 27 is connected to the first inputs of the group of elements AND-NOT 23-26 receiving information. The outputs of the decoder 12 are connected to the inputs of the priority pulse shaper 13, the output of which is connected to the first input of the second element OR 7, the output of which is connected to the inputs of the modulator 2 and switching device 6.

 When a signal appears at the input of the transceiver 3, it amplifies this signal and passes it to the filter 4. After filtering, the waveform is restored by the amplitude discriminator 5. A single signal at the input of the delay element 9 causes the appearance of a signal of zero level at its output and at the second inputs of the group of AND-NOT elements 15-17 information playback, at the first input of the second AND-NOT element 19 and at the inverse input of the third OR element 22. At the same time, the triggering of the group of AND-NOT elements 15-17 of reproducing the information of the second element is prohibited -NOT 19 and a signal appears at the output of the third element OR 22, starting the distributor 29. The delay element 9 gives a zero signal at the output, if there is always a single signal at its input, and turns off when a single signal disappears from its input after a somewhat longer time interval, than the largest possible interval of the zero signal in any message transmitted in the communication system. Next, the pulses coming from the output of the amplitude discriminator 5 through the first element OR 27 are fed to the first inputs of the group of elements AND 23-26 receiving information and are recorded in the register 20 as pulses from the outputs of the part of the group of elements AND 25, 26 receiving information or the entire group of elements AND-NOT 22-26 receiving information that occur simultaneously with the appearance at the outputs of the distributor 29 clock pulses. To ensure the correct recording of information in the corresponding triggers of register 20, they are initialized by the output signal of one member of the group of AND-NOT 23-26 elements receiving information of the AND-26 element. The sequence of recorded signals begins with a flag, which is six units between two zeros. What follows, for example, is the address of the recipient, the address of the sender and the message itself, or a fragment of it, if the message is long. The message ends with a trailer and a second flag. If the received address of the recipient matches the address of this subscriber, then he from the output of the register 20 causes the appearance of a single signal at the output of the element And 28, which allows further recording of the message in the register 20 of this subscriber. Otherwise, this recording is terminated. After the communication session, a single signal at the output of the delay element 9, at the end of its exposure time is restored and the communication system becomes prepared for subsequent communication sessions.

 If the communication channel is free and the exposure time of the delay element 9 has expired, then when a single signal appears at the output of the message transfer initialization register 20, it is fed to the second input of the AND-NOT element 19 and through the shaper 8 to the input of the counter 11. In this case, information about the initial the message priority is rewritten from register 20 to counter 11. At the same time, the signal from the output of the second AND-NOT 19 element includes a decoder 12 and a zero signal from one of its outputs, arriving at the corresponding input of the priority pulse shaper 13, calling There appears a priority pulse at its output with a duration proportional to the fixed value of the initial priority code of the given message. This pulse, combined with single flag signals, increases the duration of the continuous sequence of signals jointly formed in this way, and the duration of priority pulses can be a multiple or a part of the pulse duration of a multi-channel single-channel communication device, which depends on the conditions of communication. The priority pulse, entering the input of the third element OR 22, starts the distributor 29, and, entering the input of the second element OR 7, initiates the transmission of a single signal to the communication channel. Immediately after the leading edge of the priority pulse, six units of the flag signal follow. The sequence transmitted in this way is received by all devices for multicast single-channel communication of a given channel according to the already described case of message transmission, the priority of which was zero, and the communication channel was free.

 If the shapers of priority pulses of two or more subscribers issued their signals at the same time, then subscribers having shorter durations of priority pulses will switch under the influence of a signal of a subscriber having a longer duration of priority pulses from the transmission mode to the reception mode. If the duration of both priority pulses added to the flag pulses coincides, then these subscribers continue to work in the transmission mode until one of the subscribers has zero in the transmitted sequence of pulses of the recipient address and one for the other. At the same time, the subscriber who transmitted the zero signal will turn off, but when it is turned off, the RS trigger 10 will switch to the zero state, which was previously set to a single state under the influence of pulses from the output of the first AND-NOT 18 element. At the same time, in the counter 11 pulses is written in addition to the initial priority code one and the priority of the message of this subscriber will increase. If this subscriber is turned off again, then the priority of his message will increase again and will increase until the message is transmitted. To increase the reliability of the transmission of the address of the recipient, it is transmitted twice, and with the help of the trailer, control over the reliability of the transmission of the message is organized.

 The above-described operation of the blocks and nodes of the device for multi-subscriber single-channel communication is presented on the example of the signal implementation processing in FIG. 2 and 3 by timing diagrams of signals in the reception mode and in the playback mode, respectively: 30 — a signal at the output of the amplitude discriminator 5 and the first element OR 27; 31 - signal at the output of the delay element 9; 32 - signal at the output of the second element AND 19; 33 - signal at the output of the third element OR 22; 34, 35, 36 and 37 - signals, respectively, at the first, i, i + 1 and last outputs of the distributor 29; 38-41 - signals at the outputs of the group of elements AND-NOT 26-23 receiving information; 42 - signal at the output of the element And 28; 43 - 46 - signals at the respective outputs of the register 20 after exposure, respectively, to the signals from the outputs of the groups of elements AND-NOT 26-23 receiving information; 47 - signal at the output of the element AND 23 NOT receiving information; 48-50 - signals at the outputs of the register 20, received at the inputs, respectively, of the group of elements AND-NOT 15-17 information playback; 51 - signal at the output of the initialization of the transfer of messages from register 20; 52 - signal at the output of the delay element 9; 53 - signal at the output of the second element AND 19; 54 - signal at the output of the driver 13 pulses of priority; 55 - signal at the output of the shaper 8; 56-59 - a signal at the priority output of the register 20 (input recording information about the initial priority of the message counter 11); 60-63 - signals at the outputs of the counter 11; 64-66 - signals at the first, i-th and last outputs of the distributor 29; 67-71 - signals at the outputs, respectively, of a group of AND-NOT 15-17 elements of information reproduction, the first AND-NOT 18 element and the second OR 7 element.

 A device for multicast single-channel communication can provide a utilization rate of the communication channel close to unity.

Claims (1)

 DEVICE FOR MULTI-VALUE SINGLE-CHANNEL COMMUNICATION, comprising a transceiver, including a modulator, a transceiver, a filter, an amplitude discriminator and a switching device, a delay element and a control unit for receiving and reproducing, including a register, a pulse distributor, groups of AND elements - NOT receiving and reproducing information, AND element , the first AND element is NOT and the first OR element, and the output of the amplitude discriminator of the transceiver device is connected to the first input of the first OR element and the input m delay element, the output of which is connected to the second inputs of the group of elements AND - NOT reproducing information, the output of the first element OR is connected to the first inputs of the group of elements AND - NOT receiving information, the first inputs of the group of elements AND - NOT reproducing information and the second inputs of the group of elements AND - NOT receiving information connected to the outputs of the distributor, the third inputs of the group of AND elements - NOT reproducing information are connected to the information outputs of the register, and their outputs - to the corresponding inputs of the first element AND - NOT, the output of which is connected to the second input of the first OR element, the third inputs of the part of the group of AND elements - NOT receiving information are connected to the output of the AND element, whose inputs are connected to the corresponding outputs of the register, the information inputs of which are connected to the outputs of the group of AND elements - NOT receiving information, and the outputs the modulator and the switching device are connected to the inputs of the transceiver, the output of which through the filter is connected to the input of the amplitude discriminator, characterized in that an RS-trigger, counter, decoder are introduced into it p, the priority pulse shaper, the shaper, the second and third OR elements and the second AND element - NOT, the output of the amplitude discriminator of the transceiver device being connected to the RS-trigger shutdown input, the output of the delay element to the first input of the second AND element - NOT and to the inverse input of the third element OR, the priority outputs of the register are connected to the installation inputs of the counter, the outputs of which are connected to the information inputs of the decoder, the counting input to the inverse output of the RS trigger, and the recording output to the output of the the driver, whose input is connected to the output of the message transfer register, which is also connected to the second input of the second element AND is NOT, the output of which is connected to the input of the decoder, the outputs of which are connected to the inputs of the priority pulse shaper, the output of which is connected to the first input of the second element OR and to the direct input of the third OR element, the output of which is connected to the start input of the distributor, the output of the first AND element is NOT connected to the input of the RS-trigger and the second input of the second lementa OR, whose output is connected to the inputs of the modulator and the switching device TRD.

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