SU1070700A1 - Error protection device - Google Patents

Abstract

1. DEVICE FOR PROTECTION AGAINST ERRORS, containing in transmission a serially connected input drive, a jumper and an encoder, a serially connected lock counter and a block of memos, the first output of which is connected to the second input of the switch, to the third input of which the second output of the memory block is connected, the second input of which is combined with the fourth input .. of the switch and connected to the second output of the blocking counter, the first output of which is connected to the fifth input of the switch, and also sequentially connected In this case, the second input of the memory unit is connected to the first input of the input drive and is an information input, and the output of the command sensor is connected to the second input of the input drive, and the serially connected lock counter, output drive is connected to the second input of the input drive. sensor exchange signals, to the second input of which the second output of the blocking counter is connected, the third output of which is connected to the first input of the first element NO, serially connected input storage and desh the service command fragment, as well as the decoder and the first element —OR, whose output is connected to the input. A command sensor request and the lock counter input, the second output accumulator output is connected to the second input of the output accumulator / and the input of the input accumulator is combined with the input of the decoder and is the input of the communication channel, characterized in that, in order to increase the probability of detecting errors by reducing the inserts and depositions of the combinations, and in series at the reception, serially connected comparison unit, coincidence counter and element t I and series-connected block of OR elements and the second jg element NO, the output of which is connected to the first input of the OR element and the second input of the AND element whose output is connected to the third input of the output accumulator and the first input (blocking counter on the transmission) to the second the input of the first element OR the output of the first element HETj is connected to the second input (of which the second output of the block of elements OR is connected, the first input of which is connected to the output of the coincidence counter, the second input is connected: output of the decoder the third input of the block of elements OR is connected to the decoder input, the first output of the lockout is connected to the second input of the second element NO, the third output of the input accumulator is connected to the first input of the comparison unit, the second input of which is combined with the input of the input accumulator, and at the output sensor signal exchange is connected to the second input of the lock counter. 2, the device according to claim 1, characterized in that the input storage device at the reception is made in the form of series-connected 5ufer

Description

foot. the register and the register whose input is the second output and the output the third output of the input accumulator, the second output of the buffer register is the first output, and the input of the input accumulator.

The invention relates to communication technology and can be used to protect data transmission equipment with decisive feedback from inserts and data dropouts.

A device for detecting insertions and outliers in data transmission systems is known, containing a serially connected drive, a decoder, a first key, a comparison unit and a counting unit, the other inputs of which are connected respectively to the output of the detection unit and the input of the first key whose other output is connected to the first input storage device, the second input of which is connected to another input of the fuser unit, moreover, an input signal is fed to the input of the detecting unit and another input of the first key; wearer, Pierce element and first AND element, as well as second and third keys, second AND element and OR element, with the output of the detection unit connected to the input of the additional Storage device and another input of the Pierce element, and the output of the first AND element connected to the second input of the accumulator j the third output of which is connected via the second key to the input of the OR element, the other input of which is connected via the third key respectively to the second output of the accumulator and the first output of the scaling unit, the second output of which is connected to another input of the watt key and the third input of the accumulator, the fourth input of which is connected to the first input of the conversion unit, the third output of which is connected through the second element I to the fifth input of the accumulator, and the other input of the first element I is connected to another output of the comparison unit and the other input of the second element And is connected to the output of the decoder ill.

This device detects inserts and data drops in data transmission systems with high accuracy detects inserts and pulses at one of the stations; however, at another station, false fixation of falls and inserts is enhanced by the transformation of the combination.

Request to prohibited by code when transmitting over a reverse channel.

The closest to the present invention is an error protection device comprising a serially connected input storage device, a switch and an encoder, a serially connected lock counter and a memory block, the first output of which is connected to the second input of the switch, the third output of which is connected to the third input memory, the second input of which is combined with the fourth input of the switch and connected to the second output of the blocking counter, the first output of which is connected to the fifth input of the switch as well as serially connected sensor commands and exchange signal sensors, the second input of the memory unit is combined with the first input of the input accumulator and is an information input, and the output of the command sensor is connected to the second input of the input accumulator the blocking counter, the output drive and the exchange signal sensor, to the second input of which the second one is connected to the output of the blocking counter, the third output of which is connected to the first input of the first element NO, are connected in series input drive and decoder service commands, as well as the decoder and the first element OR, the output of which is connected to the input of the command encoder Request and the input of the lock counter, the second output of the input drive is connected to the second input of the output accumulator, and the input of the input accumulator is combined with the input of the decoder and the input of the communication channel, the output of the decoder is connected to the second input of the blocking counter and the error input of the command sensor, the output of the decoder of the service commands is connected to the first input of the first element OR, the first during the first element NO and through the counter is connected to the third input of the output accumulator and the first input of the I element on the transfer, to the second input of which is connected the input of the command sensor request, and the output is connected to the second input of the counter, blocking, the third output of the command sensor , while receiving the third output of the blocking counter through: successively connected first element NO and a delay element connected to the second input. The first OR element, to the third input of which the output of the first is connected Wow Element NO. In the device for protection against malfunction, the Elimination of type distortions of inserts and combinations of combinations occurs with the correct reception of the following two further combinations No C21. However, a disadvantage of the known device for protection against errors is the occurrence of inserts and combination drops when the No command is transformed into an allowed combination and if at least one No Two-Send command is distorted. The purpose of the invention is to increase the error detection rate by reducing insertions and loss of combinations. i The goal is achieved by the fact that the device for searching for errors, containing a serially connected input drive, a switch and an encoder, a serially connected counter 5b1y blocks and a memory block, the first output of which is connected to the second input of the switch, to the third input of which is connected The second output of the memory unit, the second input of which is combined with the fourth input of the switch and connected to the second output of the blocking counter, the neip output of which is connected to the fifth input of the switch, serially connected command sensor and exchange signal sensor, while the second input of the memory unit is combined with the first input of the input accumulator and is an information input, and the output of the command sensor is connected to the second input of the input accumulator, and at the reception a sequentially connected lock counter, output accumulator and exchange signal sensor, to the second input of which a second output of the blocking counter is connected, the third output of which is connected to the first input of the first element NO, connected in series a single drive and a decryptor of the service commands, and not a decoder and the first OR element, whose output is connected to the Inputs of the command sensor and the lock counter, the second output of the input drive is connected to the second input of the output drive, and the input of the input drive is combined with the input of the decoder and is the input of the communication channel, in & the receive are serially connected comparison unit, coincidence counter and AND element and serially connected block of OR elements and the second NO element, the output of which is connected to the The output of the OR element and the second input of the AND element, the output of which is connected to the third input of the output accumulator "to the first input of the blocking counter on the transmission, to the second input of the first element OR the output of the first element NO, is connected to the second input of the second the input of which is connected to the output of the coincidence counter, the second input is connected to the input of the decoder of the service commands, and the third input of the block of elements OR is connected to the output of the decoder, the first output of the lock-up counter to the second input of the second element NO, the third output of the input block accumulator connected to the first input of the second comparison input of which is combined with the input of the input storage means and on the transmission output sensor is connected in signal communication to a second input of the lock counter. The input drive is made in the form of serially connected buffer register and register, the input of which is the second output, and the output is the third output of the input accumulator, the second output of the buffer register is the first output, and the input is the input of the input storage. FIG. 1 is a block diagram of an error protection device; in fig. 2 explanation of the logic of the device for protection against errors. Device for protection against errors contains on the transmission input drive 1, switch 2, encoder 3, block 4 pgsh, sensor 5 exchange signals, block 6 block, sensor 7 commands, at the reception, output drive 8, element 9, decoder 10, block 11, interchange signal sensor 12, comparison block 13, coincidence counter 14, service decoder 15, commands, block of elements OR 16 and 17, elements NO 18 and 19, element OR 20, input drive 21 containing register 22 and buffer register 23. The facility for error protection works as follows. In the absence of distortions in the received information, the sensor 5 of the exchange signals of station A sends to the information source (W) a signal of readiness to receive another combination from it, which is recorded in the input drive 1 and memory block 4. Combi from input drive 1 through switch 2 is written to encoder 3, where it is redundantly encoded.

The redundant combination goes through the communication channel to the receiving part of station B, where it pops into input accumulator 21 and decoder 10. Input accumulator 21 is made in the form of serially connected buffer register 23, with a capacity of one combination, and register 22, with a capacity of t. combinations, where is the number of FBDs when requesting combinations. Registers 22 and 23 information is promoted in a sequential code. The information in the output memory 8 falls from the output of the buffer register 23 /. i.e. with a delay of h of the code combination bits.

The decoder 10 provides error detection in the combination received in the input drive 21. This combination is also analyzed by the decoder 15 service commands. In the absence of a ibyok in the received Combi Nation, it is rewritten into input drive 8, with a capacity of H com-. binations. The previously received combinations 30 advance along the output accumulator 8 to the output of one combination. Sensor 12 informs the consumer about issuing a combination to it from the output of the output drive 8. 35

Thus, in the output accumulator 8, each combination is stored during reception of h subsequent combinations.

If errors are detected in the received combination of the detection, or it is a combination of No, then the corresponding signals from the output of the decoder 10 or the decoder 15 pass through the element OR 16, the element NO 18. element 20 and arrive at the bus request and the second counter 11.

Counter 11 provides blocking of reception of the received siibochny combination (or combination and H -1 of the subsequent received combinations to the output memory 8) and closes the NO 18 element.

If an error or combination is detected No bus signal The request goes to sensor 7, which 55 writes the No command to input drive 1 and sends a signal through sensor 5 to counter 6.

As a result, the signal from the first output of the counter 6 provides transmission to the communication channel {Ehs followed by the HdT command combination from block 4. From the communication channel, the combinations go to the receiving part of station A, which is similar to B.

At station A, the No command is allocated with the help of a descriptor 15. As a result, station A also carries out operations to block reception to output accumulator 8, transmit the No command and repeat the transmission of the C combinations from block 4 (as well as at station B. In this way Correction of detected errors.

We now propose that undetected errors occurred in the He command when transmitting on the reverse channel of station B to station A), i.e. No has transformed into a digit. 2). As a result, the reception in the output memory 8 of station A will not be blocked.

Combinations 1, 2, 3 begin to arrive at station A, which were previously received by the carrier in input accumulator 21 and output accumulator 8. Since the input accumulator 21 has the capacity of h + l combinations and the received combinations advance along it from input to output, then at the moment of arrival from the channel to the input of block 13, for example, combination 1, from the output of register 22 to block 13 also enters. combination 1

As a result, in block 13, a comparison was made between the previously received combinations of 1, 2, 3, 4 (Fig. 2) and the received combinations of 1, 2, 3, H (HI-NO) (Fig. 2). The number of matching combinations is counted by counter 14.

IF the number of matches reaches m, then a signal appears at the output of counter 14, where m is the threshold level t m 6 ii-i

At the same time, the opposite station B analyzes the decoder 15 combinations received in the blocking cycle. The decoder 15 is connected to the 4i-bits of the buffer register 23. If the No option at station A were received correctly or with detected errors, the combination No. would be sent to the receiver of station B. However, the No combination in the return channel was transformed into the allowed combination 7, therefore, in the receiver of station B at the end of the blocking cycle, the No combination will not be received.

As a result, the element NO 19 remains open and the signal at the third output of the lock block 11 that passes at the end of the blocking cycle passes through the element NO 19, the OR element 20 and causes the No combination and accumulated in block 4 combinations 1 to transmit to the station A, and 2,3, 4 (Fig. 2), blocking the reception using the lock block 11 to the output drive 8, feed

prohibitive signal to the element NO 18.

Combinations. No comes to station A (Fig. 2} at the end of the comparison cycle. If it comes without distortion, then it is allocated to decoder 15. If distorted, the No error is detected in it using decoder 10. In both cases, the output of the open element NO 18, a signal appears that opens the AND 9 element and passes through the OR 20 element.

The signal from the output of the element OR 20 causes the recording of the No message using sensor 7 to input drive 1, sending a combination of No from input drive 1 via switch 2 to Link, blocking with reception counter 11 to output drive 8 and supplying a inhibitory signal to no ET. 18,

Since at station A the number of matching combinations will be equal (rio of Fig. 2 ii-l and AND 9 is open, the signal from the output of counter 14 will pass through the AND 9 h element to the third input of output-storage 8 and to counter 6. As a result, the signal at the third input of the output accumulator 8 is unlocked in it by the V received combinations 1, 1, 2, 3 (fig. 2), so the extra 4i combinations at station A are eliminated.

. The signal that passes through the bus Erasing the counter b in conjunction with the signal from sensor 7, which enters the counter 6 through sensor 5, causes a signal to appear on the second output of counter 6, which goes to the third input of unit 4 and the fifth input of switch 2. As a result after the transfer of the No from the second output of the block 4 through the switch 2 of the station A, 2 combinations A, B, C, G. D, E, F, 3 are transmitted (Fig. 3). As a result, at station B there is no loss of the combination of A. B, C and D (Fig. 2).

Thus, in the device for. protection against collisions occurs the elimination of insertions and precipitations of combinations.

According to the logic of the device to protect against errors when receiving a combination of No or detection

0 there are errors in the station, for example, A sends the command No, which at the opposite station falls during the blocking period. In this case, in the opposite direction, the No command is not sent, therefore, in

5 station A blocking cycle, the No command will not be received. Thus, with each detection, a command No appears at any station at the end of the blocking cycle.

0 and it does not appear on the second.

In this device for protection from ibioc this may cause non-recurring retransmissions of information from block 4. To prevent this

5 occurred at the reception of each station using the signal from the output of the counter 14, which records the appearance of the same numbers of 4 x x lb nations. This signal passes through

0 element OR 17 and prohibits using the element NO 19 to pass the signal from the third output of counter 11 to. Bus Request. Therefore, blocking the reception and delivery of the No command to the communication channel does not occur, i.e. cycle

5, the retransmission ends.

The technical and economic efficiency of the proposed device for protection against shshbok consists in the fact that the introduction of new units and

0 elements allowed to increase the probability of detecting errors during the transfer of an error into an allowed combination.

Claims (2)

1. ERROR PROTECTION DEVICE, comprising, in transmission, an input storage device, a switch and an encoder, a lock counter and a memory unit connected in series, the first output of which is connected to the second input of the switch, the second output of which is connected to the third input of the memory, the second input of which combined with the fourth entrance. switch and connected to the second output of the lock counter, the first output of which is connected to the fifth input of the switch, as well as sequentially connected command sensor and sensor of exchange signals, while the second input of the memory block is combined with the first input of the input drive and is an information input, and the output of the command sensor is connected to the second input of the input drive, and at the reception, the interlock counter, the output drive and the sensor of exchange signals are connected in series, the second input of which is connected to the second the output of the lock counter, the third output of which is connected to the first input of the first element NO, the input drive and the decoder of service commands are connected in series, as well as the decoder and the first OR element, the output of which is connected to the Request ”input of the command sensor and the input of the lock counter, the second output of the input drive connected to the second input of the output drive, and the input of the input drive is combined with the input of the decoder and is the input of the communication channel, characterized in that, in order to increase the probability of detecting error side by reducing insertions and deposition of the combination, it is introduced at the reception in series-connected comparison unit, a hit counter and the AND element, and the series-connected OR element block and the second NO element, the output of which is connected to the first input of the OR element and the second input of the AND element, the output of which connected to the third '1 input of the output drive and the first input of the transmission lock counter, to the second input of the first element OR the output of the first element is NO, the second input of which is connected to the second the progress of the block of elements OR, the first input of which is connected to the output of the counter of coincidences, the second input is connected quycho; to the service decoder, and the third input of the block of OR elements is connected to the output of the decoder, the first output of the lock counter is connected to the second input of the second element NO, the third output of the input drive is connected to the first input of the comparison unit, the second input of which is combined with the input of the input drive, and on transmission, the output of the signal sensor, the exchange is connected to the second input of the lock counter. 2. The device according to p. 1, characterized in that the input drive at the reception is made in the form of series-connected buffer 1070700. register and register, whose input is the second output, and the output is the third output of the input drive, the second output of the buffer register is the first output, and the input is the input of the input drive.