SU1644155A1 - Data transmission system simulator - Google Patents

Abstract

The invention relates to a data transmission technique and a digital computer. The purpose of the invention is to expand the functionality of the device by simulating a phasing mode. Device i contains a common generator of a random stream of transmitted message pulses, a pulse counter, a group of channels for transmitting information simulation, and in each channel a generator of random interference pulses during transmission of messages, a generator of random interference pulses during transmission of receipts, a reversible counter for the length of the queue of transmitted messages, triggers, clock generator, message retry time counter, OR elements, AND elements, receipt counts counter, n number counter radiation receipts counter of lost requisition, the counter repeats the number of messages, message number counter, the slave station is transmitted, the counter number of lost messages, counters. Phasing time counter, Fazirokach cycle counter. The device additionally includes And elements and a trigger, as well as a counter for the number of distorted (lost) messages, a phasing time counter, and a phasing cycle counter. 1 il.

Description

4i

The invention relates to a data transmission technique and digital computer technology and can be used in the development and simulation of data transmission systems.

The purpose of the invention is to expand the functionality of the device by simulating a phasing mode.

The drawing shows a diagram of an apparatus for modeling data transmission systems.

A device for simulating data transmission systems comprises a generator of 1 random stream of transmitted message pulses, a counter of 2 pulses, a group of 3 channels for simulating information transmission, and in each channel a generator of 4 random interference pulses in transmission of messages, the first element is HE 5, the first element is AND 6, the counter 7 the number of receipts transmitted by the subordinate station, the second element is NOT 8, the second element is And 9,

ate

counter 10 of the number of received receipts; generator of 11 random impulses of interference in the transmission of receipts; counter 12 lost orders, sixth 13 and seventh 14 elements AND, reversible counter 15 of the queue length of transmitted messages, second trigger 16, fifth element AND 17, first trigger 18, the third element AND 19, the first element OR 20, the fourth element AND 21, the generator 22 clock pulses, the counter 23 of the time of message transmission, the second element OR 24, the counter 25, the number of messages transmitted to the slave station, the counter 26 number of repetitions The eighth 27th and ninth 28 And elements, the tenth 29th and Twelfth 30 And elements, a counter 31 for the number of lost messages, a counter for 32 phasing times, a third trigger 33, the eleventh for And 34 elements, a counter for 35 phasing cycles.

The device works as follows.

At the initial moment of time, all the counters and triggers of the device are in the zero state. Generator 1 of a random stream of impulses of transmitted messages generates, at random times, pulses that arrive at the counter 2 pulses, as well as the inputs of elements 13 and 14 of all channels of information transmission modeling, simulating the data flow from the central station to all slaves.

i

The first of the pulses through the element

And 13, open zero potential, applied to the inverse input from the output of the trigger 18, is fed to the input of the element OR 20 and to the input of the trigger 18, sets it to one state. A single potential from the output of the trigger 18 prohibits the passage of pulses through the element 13 and allows them to pass through the element 14 and the element 27 opened by a zero potential applied to the inverse input from the overflow output of the reversible counter 15 of the length of the transmitted message queue the input of the counter 15, to the simulator, the filling of the buffer of the data transmission channel, and to the single input of the trigger 16. The first pulse arriving at the single input of the trigger 16 sets it to

state, and subsequent pulses do not change this state.

The pulse from the output of the element KIM 20 is fed to the input of the generator start 22 clock pulses, and through the element OR 24 to the input of the counter 25 the number of messages transmitted by the slave station to the input of the element AND 6 and the input of the element AND 34. The generator 22 clock pulses with counter 23 message repetition time is designed to simulate the waiting time for the transmitted data, and with a phasing time counter 32 to simulate the duration of the time interval of the phasing process for a specific type of equipment. Clock pulses are fed to the input of counter 23 and to the input of element I 30, closed by a zero potential, supplied from the output of trigger 33. In the absence of a receipt during the period of time determined by the frequency of the generator 22 and the digit of the counter 23, the overflow pulse from the output of the counter 23 enters through the element And 29, open zero potential, applied to the inverse input from the output of the trigger 33, to the input of the counter 26, the number of repetitions of messages and through the OR element 24 to the input of the element And 6 and the input of the element And 34, imitating repeated message to the communication channel. With the subsequent absence of a receipt (except for the moments of the data transmission system in the phasing mode), the procedure is repeated, since the generator 22 and the counter 23 are reset only with a pulse that simulates the transfer of the receipt from the output of the And 9 element.

Generator 4 of random interference pulses in the transmission of messages with the element NOT 5, element 6 and 6 is designed to simulate the flow of errors that occur in the communication channel during data transmission from the central station to all slaves.

In the absence of a pulse at the generator output 4, element 6 opens and transmits pulses to the input of element 9, the installation input of the counter 31, the number of lost messages, the input of the counter 7, the number of receipts transmitted by the slave station. Thus, the correct reception of the message is simulated, a receipt is sent from the slave station to the central one, and the counter 31 is reset. At random times, the input element HE 5 from the output of generator 4 is given control signals that prohibit the passage of pulses through element 6 and permitting cover element 9 and do not transmit pulses from element 6. Thus, the distortion (loss) of receipts from subordinate stations to the central one is simulated. If the pulses at the output of the generator 11 are missing, then the pulses from the output of the element And 6 pass through the element

pulse propagation through element 34. 10 and 9. Thus, the right model is simulated. Thus, the distortion is simulated (the receipt of receipts from the subordinate ter is received) the message in the process of its transfer stations to the central one, giving via the communication channel (from - Impulses from the output of the element And 9,

station to subordinates) and counting the number of corrupted (lost) messages. In this case, an overflow pulse at the output of the counter 31 appears only when the additional messages M sent by the slave central station are distorted, and the counter 31 is reset to the zero state by each correctly received message, i.e. impulse from the output of the element 6.

In case of distortion of the M messages messages, an overflow pulse from the counter 31 output sets the trigger 33 to a single state and thereby simulates the transfer of the data transmission system to the phasing mode, and the single potential from the trigger trigger 33 prohibits the passage of pulses from the counter 23 through the And 29 element and permits the passage of pulses through the AND 30 element to the counting input of the counter 32 of the phasing time. The duration of the phasing time interval is determined by the corresponding generator frequency 22 and the digit size of the counter 32. The overflow pulse from the output of the counter 32 sets the trigger 33 to the zero state, and also enters the input of the counter 35 of the phasing cycles. The zero potential from the output of the trigger 33 closes the element And 30 and opens the element And 29.

Thus, the output of the data transmission system from the phasing mode is simulated.

Generator 11 random interference pulses in the transmission of receipts with the element NOT 8, element And 9 are designed to simulate the distortion (loss) of receipts from the subordinate stations to the central one. At random times from the output of the generator 11 through the element NOT 8 to the input of the element And 9 signals are given

which cover the AND 9 element and do not transmit pulses from the AND 6 element. Thus, the distortion (loss) of receipts from subordinate stations to the central one is simulated. If the pulses at the output of the generator 11 are missing, then the pulses from the output of the element And 6 pass through the element

simulating the transfer of receipts to

the reverse channel, reset the counter 23 and the generator 22, and also arrive at the input of the counter 10 the number of received receipts and to the subtracting input of the counter 5 through the element 17, which is open by the potential supplied from the output of the trigger 16 set to one at the moment of the start of simulation fill-buffer data channel.

The same potential from the output of the trigger 16 is open element And 21, through which the pulses from the output element And 9 arrive at the input of the element OR 20 and then into the device, the model issue

from the buffer to the channel of the next data block.

At the same time, the contents of the counter 15 are reduced by one. If, with the arrival of the next pulse, the contents of the counter 15 become different to zero, then from its zero output, the zero pulse, which sets the trigger 16 to the zero state, enters the trigger 16.

the In this case, the elements And 17, 21 are closed and the element And 19 is opened. An impulse simulating the transfer of receipts from the output of the element And 9 passes through the element And 19 to the trigger input

18 and sets it to the zero state, thereby preparing the passage of the next pulse that simulates the transmitted message directly to the data channel through

element and 13.

In case of overflow of the counter 15, the single potential from its overflow exit prohibits the passage of the next quota through the element 27 and

Claims (1)

opens element 28 for the counter counting 12 lost orders. Claims An apparatus for modeling data transmission systems comprising a gene161644155 RATOR of a random stream of transmitted message pulses, a pulse counter and a group of information transfer simulation channels, each of which contains a counter for the number of message repetitions, a serially connected generator of random interference pulses when transmitting messages, the first element is NOT, and the first AND element whose output is connected to the counter counting input the number of receipts transmitted by the subordinate station, a serially connected generator eight the input of the fourth element And the inverse input of the third element And, the overflow output of the reversible counter of the queue length of the transmitted messages is connected to the second input of the ninth And element and the reverse input of the eighth And element whose output is connected to the summing input of the reversible counter of the queue of transmitted messages the flow of pulses of transmitted messages is connected to the counting input of the pulse counter and random noise pulses at the transmission of | $ with direct inputs of sixth than receipts, the second element is NOT and B10 items And the second inputs of the seventh elements And all channels of information transfer modeling, characterized in that, in order to expand the functionality of the device by simulating the Tier mode, each channel of information transfer modeling additionally contains the tenth, eleventh and twelfth elements And, the phasing time counter, phasing cycle counter, lost messages counter, and third trigger, with the time counter overflow output on each information transfer simulation channel message replay is connected to the direct input of the tenth AND element, the output of which is connected to the counting input of the counter of message repetition and the second input of the second OR element, the output of which is connected to the first input of the eleventh And element, the second input of which is connected to the output of the random noise pulse generator when sending messages, the output of the eleventh element I is connected to the counting input of the counter of the number of lost messages, the overflow output of which is connected to the single input of the third trigger a, the direct output of which is connected to the inverted input of the tenth element And and the first input of the twelve- 50 that element, the second input of which is connected to the output of the clock generator, the output of the twelfth element And connected to the counting input of the phasing time counter, the overflow output of which is connected with zero input of the third trigger and counting input of the phasing cycle counter, and the setup input is the account The second element is And, another input of which is connected to the output of the first element And, and the output of the second element And is connected to the counting input of the number of received receipts, the installation input of the message transmission retry time counter, the installation input of the clock generator, and the first inputs of the fourth and fifth elements And, the output of the third element And connected to the single input of the first trigger, the direct output of which is connected to the inverse input of the sixth element And and the first input for the seventh element And, the output of which is connected to the single input of the second trigger, the direct input of the eighth element And and the first input of the ninth element And whose output is connected to the counting input of the counter of the lost order, the output of the sixth element And is connected to the zero input of the first trigger and the first input of the first element OR, the second input of which is connected to the output of the fourth element AND, the output of the first element OR is connected to the first input of the second element OR and the start input of the clock pulse generator, the output of which is connected ene to the count input of the time counter repeating the transmission of messages, the output of the second OR gate coupled to an input of the counter messages transmitted by the slave station and another input of said first AND gate, the output of the fifth AND gate is connected to the subtraction input of down counter queue length messages to be transmitted, the zero output of which is connected to the zero input of the second trigger, the direct output of which is connected to the second input of the fifth element I, the second eight | $ with direct inputs sixth five 0 five Q p items And the second inputs of the seventh elements And all channels of information transfer modeling, characterized in that, in order to expand the functionality of the device by simulating the Tier mode, each channel of information transfer modeling additionally contains the tenth, eleventh and twelfth elements And, the phasing time counter, phasing cycle counter, lost messages counter, and third trigger, with the time counter overflow output on each information transfer simulation channel message replay is connected to the direct input of the tenth AND element, the output of which is connected to the counting input of the counter of message repetition and the second input of the second OR element, the output of which is connected to the first input of the eleventh And element, the second input of which is connected to the output of the random noise pulse generator when sending messages, the output of the eleventh element I is connected to the counting input of the counter of the number of lost messages, the overflow output of which is connected to the single input of the third trigger a, the direct output of which is connected to the inverse input of the tenth element And and the first input of the twelve 0th element, the second input of which is connected to the output of the clock generator, the output of the twelfth element And is connected to the counting input of the phasing time counter, the overflow output of which is connected with zero input of the third trigger and counting input of the phasing cycle counter, and the setup input of the score5 number of lost messages connected to the output of the first element K,