SU1444805A1 - Arrangement for simulating a communication system - Google Patents

Abstract

The invention relates to digital computing and can be used in modeling the operation of a communication system. The purpose of the invention is to enhance the functionality by simulating the transmission of messages of different priority over a single communication channel. New in the device is the introduction of a pulse generator of priority messages and a NOT element, which allows to simulate the operation of a communication system with the transmission of a single communication line with interference of priority and ordinary messages with absolute priority of priority messages and to determine the number of lost messages of both types due to interference in the communication line. 1 il. with

Description

four

four;

00

11A

The invention relates to digital computing and can be used to model the operation of communication systems.

The purpose of the invention is to expand the functionality of the device by simulating the transmission of messages of different priority over a single communication channel.

The drawing shows a block diagram of the device.

The device for simulating a communication system contains a generator of 1 message pulses, counters 2 chips, setup input 3, first element 4, delay element 5, first element 6, trigger 7, generator 8 of random pulses of pulses, first element 9 , the second element And 10, the fifth 11 and the third 12 elements And, the generator 13 pulses of priority messages, the second element NOT 14, the fourth element And 15 and the second element OR 16.

Before the device starts its operation, through its installation input, the control inputs are turned over to the installation inputs of all 2 pulse counters and to the trigger input 7. a pulse counter 2 and a triggering trig 1 - state 1, which allows the passage of signals through the AND 4 element.

The message pulse generator 1 generates a sequence of pulses that simulate the stream of lower priority messages that arrive at the input of the communication system. The number of pulses from the generator output J pulses is counted by the first counter of 2 pulses. The pulses from the output of the generator 1 are fed to the input element And 4.

The pulse from the output element And 4 is fed to the input of the fourth element And 15, to the counting input of the second counter 2 pulses, to the second input of the trigger 7 and to the input of the element 5 delay. In this case, the trigger 7 goes to the state O, prohibiting the passage of signals through the element AND 4. After the delay time (the service time or transmission of one message) from the output of the delay element 5, the pulse through the element OR 6 sets the trigger 7 to state 1 than the passage of signals through element 4 is allowed again. Thus, the model

0

five

five

0

0

The loss of lower priority messages at the input of a communication channel due to queuing.

The generator 13 at random times generates pulses that simulate the flow of messages of higher priority. The number of these pulses is counted by a fourth counter of 2 pulses. The pulses from the output of the generator 13 are also fed to the input of the element OR 16, to the input of the element AND 12 and to the input of the element NOT 14. At the time of the appearance of the pulse at the output of the generator 13, the passage of signals through the element 15 is forbidden ). Thus, information losses (lower priority messages) are modeled during the transmission of higher priority messages. The pulses from the output of the element And 15 are fed to the input of the element And P, to the input of the element OR 16 and to the counting input of the third counter 2 pulses.

From the output of the element OR 16, the combined information flow (impulses, modeling messages of higher and lower priorities) goes to the counting input of the fifth counter of 2 pulses and to the input of the element 10.

The generator 8 of a random stream of pulses, the element HE 9 and the element AND 10 are intended to simulate the flow of an incident wave that acts on messages in the communication channel. At random times of occurrence of pulses at the output of the generator 8, the signals are prevented from flowing through the element 10. In the absence of pulses, the output of the generator 8 is allowed to pass signals through the element 10. The pulses from the output of the element 10 enter the counting input ujecToro of the counter 2 pulses.

Counters 2 count: the number of lower priority messages received at the input of the communication system (the contents of the first counter are 2 pulses); the number of higher priority messages received at the input of the communication system (the contents of the fourth counter of 2 pulses); the number of lower priority messages that have passed the queue at the input of the communication channel (the contents of the second counter 2 pulses); the number of lower priority messages received by the communication channel (the contents of the third counter 2 pulse5

five

0

owls); the number of messages of the highest and lowest priorities received in the communication channel (the contents of the fifth counter of 2 pulses); the number of high and low priority messages received at the receiving side (the contents of the sixth counter of 2 pulses); the number of lower priority messages distorted in the communication channel (the contents of the seventh counter 2 pulses); the number of high priority messages distorted in the communication channel (the contents of the eighth counter of 2 pulses).

Claims (1)

Invention Formula A device for simulating a communication system comprising a message pulse generator, the first AND element in series, a delay element, the first OR element and a trigger, a series-connected random pulse generator, the first NOT element and the second AND element, the other input of the first OR element are serially connected. the input of the device, the output of the first element I- is connected to another input of the trigger, the direct output of which is connected to the first input of the first element I, the third, fourth and fifth elements Ha / 44805 And, the second element 1-SHI, characterized in that, in order to extend the functionality  devices by simulating the process of transmitting messages of a higher and lower priority over a single communication channel; it additionally contains a second element NOT and a generator 10 W of priority messages, with the output of the pulse generator of priority messages connected to the first input of the third element AND, the first input of the second element OR 15 and the input of the second element NOT, the output of which is connected to the first input of the fourth element And, the second input of which is connected to the output of the first element And, and the output of the fourth element And connected to the first input of the fifth element AND and the second input of the second element OR, the output of which connected to another. input of the second element And, the output of which is connected to 2 outputs of the received device messages, the output of the random pulse generator is connected to the second inputs of the third and fifth AND elements, the outputs of which are, respectively, the output of the lost high priority device messages and the output of the lost low priority device messages.