RU2251150C2 - Device for modeling communications system - Google Patents

Abstract

FIELD: computer science.

SUBSTANCE: device has refuse generator, pulse generator, two counters, RS-trigger, indication block, random error pulses stream generator, two AND elements, N parallel first and third branches, each of which has counter, H element, HE element, RS-trigger, N parallel second branches, each of which has RS-trigger, pulse counter, H element, while each branch additionally has device for imitating refuses and restores.

EFFECT: broader functional capabilities.

2 dwg

Description

The invention relates to computer technology, communication technology and can be used to simulate the transmission of information on a circular network from the main station to N subscribers in different jamming conditions and the possibility of failures and simulate the restoration of each communication direction. The technical result is to expand the class of tasks by modeling the functioning of the network in the conditions of failures and restoration of communication lines. The device contains a pulse generator, pulse counters, RS-flip-flops, an indication unit, a random error flow generator, a random fault flow generator, failure simulation and recovery devices, OR elements, and I.

A device [1] is known for simulating the operation of a communication system containing four pulse counters, an RS-trigger, a pulse generator, a reflection board and series-connected random pulse generator of error pulses, an element NOT and an element I. However, this device does not provide the ability to simulate the mode of bringing the circular messages from the main station to N subscribers in the event of failures and their recoveries in each direction of communication.

Closest to the proposed technical essence is a device [2] for modeling a circular communication system containing serially connected pulse generator, pulse counters, RS-flip-flops, display unit, random error flow generator, OR element, element I.

The disadvantage of this device is that it cannot simulate failures and restores of the communication network, and as a result, there is no accounting for the effect of failures and restores of communication lines on the timely delivery of information to subscribers of the network and confirmation of receipt of information to the main station.

The aim of the invention is to expand the functionality by providing simulation of the mode of bringing circular messages from the main station to N subscribers and confirmations of receipt of information from subscribers to the main station in the conditions of failures and restoration of communication lines in each communication direction. This goal is achieved by the fact that in the device [2], containing a series-connected pulse generator, pulse counters, RS-flip-flops, an indication unit, a random error flow generator, an OR element, an AND element, failover and recovery simulator devices and a failure generator are introduced. Each failure and recovery simulation device consists of a pulse counter, NOT elements, AND elements, OR elements.

Introduction to the prototype of new distinctive features - a device for simulating failures and recoveries and a failure generator allows the device to simulate the mode of bringing circular messages from the main station to N subscribers and confirmations of receiving information from subscribers to the main station under conditions of failures and restoration of communication lines in each communication direction.

A large number of communication systems based on the radial principle are known in which the message is transmitted from the main station to N subscribers by repeatedly repeating the transmitted message with acknowledgment by its subscribers. Due to the different nature of the factors affecting the reliability of communication lines, the probability of failures in each communication line and the recovery time of each line is different. Determining the probabilistic characteristics of message delivery in such communication systems is a difficult task, therefore, the modeling of such systems is relevant at the stages of their development and design.

The analysis of the prior art made it possible to establish that there are no analogues identical to the features of the claimed technical solution, which indicates the compliance of the claimed device with the condition of patentability “novelty”. The distinguishing features introduced - the device for simulating failures and restorations and the generator of failures are not found in them. Therefore, the claimed device satisfies

the criterion of “significant difference”. The industrial reproducibility of the introduced elements is due to the presence of the element base on the basis of which they can be performed. In the drawings indicated:

1 - pulse generator;

2 - second pulse counter;

3 - the first element OR;

4 - the first RS-trigger;

5.1 ... 5.N - the first element And;

6.1 ... 6.N - the first element is NOT;

7.1 ... 7.N - fourth pulse counter;

8 - generator of a random stream of error pulses;

9.1 ... 9.N - second RS-trigger;

10 - the second element And;

11 - third pulse counter;

12.1 ... 12.N is the first pulse counter;

13 - display unit;

14.1 ... 14.N - the third element And;

15.1 ... 15.N - the second element is NOT;

16.1 ... 16.N - fifth pulse counter;

17.1 ... 17.N - the fourth element of And;

18.1 ... 18.N - sixth pulse counter;

19.1 ... 19.N - the third RS-trigger;

20.1 ... 20.N - the fourth RS-trigger;

21 - fault generator;

22 - device for simulating failures and restoring communication lines;

23 - the third element is NOT;

24 - the fourth element is NOT;

25 - the fifth element And;

The 26th element is NOT;

27 - seventh counter of impulses;

28 - the sixth element And;

29 - the sixth element is NOT;

30 - the seventh element is NOT;

31 - the seventh element And;

32 - the eighth element of And;

33 - the second element OR;

34 - the ninth element is NOT;

35 - the third element OR;

36 - the eighth element is NOT;

37 - the ninth element of I.

The claimed device is illustrated by drawings, which show:

- figure 1 - diagram of a device for modeling a communication system;

- figure 2 is a diagram of a device simulating failures and recoveries of a communication line.

The device for simulating a communication system shown in Fig. 1 contains a pulse generator 1 connected in series, a second pulse counter 2, a first RS-trigger 4, a third pulse counter 11, and contains N parallel first branches consisting of a fourth pulse counter 7 connected in series the first element NOT 6, the first element And 5, a device for simulating failures and restoring the communication line 22, the second RS-trigger 9 and the first pulse counter 12, and the output of the pulse generator 1 is connected to the second inputs of all the first e elements And 5 and the R-input of the first RS-flip-flop 4, the output of which is connected to the R-inputs of all the second RS-flip-flops 9, contains N parallel second branches, each of which consists of a fourth RS-flip-flop 20 connected in series, the fourth element And 17 and the sixth pulse counter 18, while the output of the second RS-trigger 9 of each first branch is connected to the S-input of the fourth RS-trigger 20 of the corresponding second branch, the output of the sixth pulse counter 18 is connected to the R-input of the fourth RS-trigger 20 of the same branch, and the output of the pulse generator 1 is connected to the first inputs of all the fourth elements And 17, contains N parallel third branches, each of which consists of a fifth pulse counter 16, the second element NOT 15, the third element And 14, a device for simulating failures and restoring the communication line 22 and the third RS-trigger 19, contains a random error pulse generator 8, the output of which is connected to the inputs of all fourth 7 and fifth 16 pulse counters, the output of the fourth element And 17 of each second branch is connected to the second input of the third element And 14 of the corresponding third branch, and the output q the first RS-trigger 4 is connected to the R-inputs of all third RS-flip-flops 19, contains the second element And 10 and the first element OR 3 connected in series, and the outputs of all third RS-flip-flops 19 are connected to the corresponding inputs of the second element And 10, the output of which connected to the second input of the first element OR 3 and to the second input of the second pulse counter 2, the output of which is connected to the first input of the first element OR 3, and the output of the first element OR 3 connected to the S-input of the first RS-trigger 4, contains a display unit 13, and the outputs of all the first x pulse counter 12, and a third pulse counter 11 are connected to respective inputs of the indication unit 13 comprises failures generator 21, whose output is connected to second inputs of failure simulation devices and communication lines 22 rebounds.

The communication line failure and recovery simulator shown in FIG. 2 comprises a third element HE 23, a fourth element HE 24, a fifth element AND 25, a fifth element HE 26, a seventh pulse counter 27, a sixth element AND 28, a sixth element HE 29, the seventh element is NOT 30, the seventh element is AND 31, the eighth element is AND 32, the second element is OR 33, the ninth element is NOT 34, the third element is OR 35, the eighth element is NOT 36, the ninth element is AND 37.

The device operates as follows.

The general principle of operation of the device in an interference environment is described in [2]. When simulating failures and recoveries of communication lines, the device operates as follows.

Upon receipt of a negative potential from the fault generator 21, which means that a failure has not occurred, and the receipt of negative impulses from the fifth element And 25, which means that at the moment there is no restoration of the line after the failure, from the output of the sixth element And 28 to the input of the seventh element And 35 will receive a positive potential. From the output of the second element OR 33 to the input of the seventh element And 35, regardless of whether the information is transmitted over the communication line or not, a positive impulse will come. From the output of the seventh element And 31 to the seventh element NOT 30 will receive a positive potential. The input of the seventh counter of pulses 27 will receive a negative potential. In this case, the output of the fifth element And 27 will be a negative potential, which, passing through the sixth element NOT 29, is converted to positive and will go to the input of the eighth element And 32, thereby allowing the transmission of information in the line. The output of the third element OR 35 will be the pulse that is transmitted in the communication line, which simulates the normal mode of operation of the communication line.

Upon receipt of a positive pulse from the fault generator 21, which means that a failure has occurred, and a negative pulse from the fifth element And 25, which means that at the moment there is no restoration of the line after the failure, from the output of the sixth element And 28 to the input of the seventh element And 31 negative potential will come. From the output of the seventh element And 31 to the seventh element NOT 30 will receive a negative potential. The input of the seventh counter of pulses 27 will receive a positive potential. In this case, the output of the fifth element And 25 will be a positive potential, which, passing through the sixth element NOT 29, is converted to negative and will go to the input of the eighth element And 32, thereby prohibiting the transmission of information in the line. The seventh pulse counter 27, filling, simulates a delay for the restoration of the line. The duration of the delay is determined by the capacity of the pulse counter. Until the seventh pulse counter 27 is full and an overflow pulse appears at its output, positive pulses will arrive from the output of the fifth AND 25 element. When the overflow pulse of the seventh pulse counter 27 appears from the output of the fifth element And 25, a negative pulse will arrive, which means that the restoration of the line is completed. From the output of the ninth element AND 37 to the input of the third element OR 35 will receive a negative potential. From the output of the third element OR 35 at the entrance to the communication line will receive a negative potential.

Upon receipt of a positive pulse of the fifth element And 25 and a negative or positive potential from the fault generator 21, the output of the sixth element And 28 at the input of the seventh element And 31 receives a negative potential, which, passing through the seventh element NOT 30, fills the seventh pulse counter 27, simulating the time delay required to restore the communication line. The eighth element And 32 prohibits the transmission of information over the communication line. From the output of the third element OR 35 at the entrance to the communication line will receive a negative potential.

The device for simulating failures and recoveries of the communication line functions in the same way both for the direction of communication “main station - subscriber” and for the direction “subscriber - main station”.

The outputs of the third pulse counter 11 and all first pulse counters 12 are connected to the corresponding inputs of the display unit 13, which is intended to indicate the main parameters of the simulated process - the number of messages Nc transmitted in the network, as well as the number of messages received by each subscriber Na.j.

The developed system should ensure the transmission of information from the main station to subscribers and in the opposite direction with a probability no less than required. The probability of bringing information for each subscriber taking into account the reliability of the communication line can be defined as a function of the average recovery time (t _in ) and the mean time between failures (T):

P = f (t _in , T).

The calculation of the likelihood of bringing information through the communication lines from the main station to the subscriber and from the subscriber to the main station by analytical means is a rather difficult task, since it is necessary to take into account the presence of various factors affecting the reliability of each communication line.

Using this model, based on the received parameters - the number of messages Nc transmitted in the network and the number of messages received by each subscriber N _ab.j. it is possible to determine the probability of delivering messages to each subscriber of the communication system for given t _in and T according to the following formula:

Such modeling of the system at the stage of its development allows to reduce development time while reducing the cost of the work itself and to set requirements for recovery time and mean time between failures for each communication line, taking into account the required probability of bringing information to the subscriber.

Sources of information

1. The invention of “Device for modeling a communication system”: patent SU 1059577 C2, (51) 7 G 06 F 15/20, publ. 12/07/1983.

2. The invention of “Device for modeling a communication system”: patent RU 2189077 C2, (51) 7 G 06 N 1/00, G 06 G 7/48, publ. 09/10/2002.

Claims (1)

A device for simulating a communication system comprising a pulse generator, a second pulse counter, a first RS trigger, a third pulse counter and an indication unit, and a random error pulse stream generator, the pulse generator output being connected to the R input of the first RS trigger and all second inputs of the first and fourth elements And containing N parallel first branches, each of which contains a fourth pulse counter connected in series, the first element is NOT, the first element is And, second the second RS-trigger and the first pulse counter, while the outputs of all the first pulse counters are connected to the corresponding inputs of the display unit, N parallel second branches, each of which contains a fourth RS-trigger, the fourth AND element and the sixth pulse counter in series, with the output the second RS-trigger of each first branch is connected to the S-input of the fourth RS-trigger of the corresponding second branch, the output of the sixth pulse counter of each second branch is connected to the R-input of the fourth RS-trigger of the same branch, and the output is gene the pulse generator is connected to the second inputs of all fourth elements of AND, containing N parallel third branches, each of which contains a fifth pulse counter connected in series, a second element NOT, a third AND element and a third RS-trigger, while the output of the random error pulse generator is connected to the inputs of all fourth and fifth pulse counters, the output of the fourth AND element of each second branch is connected to the second input of the third AND element of the corresponding third branch, the output of the first RS-trigger is connected to R-in dams of all second and third RS-flip-flops, as well as containing the second AND element and the first OR element, connected in series, while the outputs of all third RS-flip-flops are connected to the corresponding inputs of the second AND element, the output of which is connected to the second input of the first OR element and the second input a second pulse counter, the output of which is connected to the first input of the first OR element, and the output of which is connected to the S-input of the first RS-trigger, characterized in that a fault generator is introduced into it and, in each branch, simulation devices from kazov and recovery, and the output of the fault generator is connected to all the second inputs of the failure simulation and recovery devices, and in each of the N parallel first branches, the first element And is connected to the failure simulation and recovery device, which is connected to the second RS-trigger, and in each of N parallel third branches of the third element And is connected to a device for simulating failures and recoveries, which is connected to the third RS-trigger.

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