SU809597A2 - Device for analysis communication channel state - Google Patents

Description

(54) DEVICE FOR ANALYSIS OF CONDITION OF A COMMUNICATION CHANNEL

one

This invention relates to telecommunications technology and may be used.

to monitor the state of telegraph and telephone communication channels exposed to intense interference.

According to the main auth. No. 634461, a device for a communication link state analysis is known. It contains an error detection unit and a reversible counter, the input of which is connected to the output of the divider via OR, the second and third inputs of which are connected to the outputs of the first and second multipliers, sequentially connected shaper time intervals

 cs5 myrn) ITs counter, zone decoder, the second input of which is connected to the output of the time interval generator, the third multiplier and the second OR element, while the output of the error detection block is connected to the combined second inputs of the summing counter and the second OR element whose output is connected to the input A reversible counter, a forwarding slot input is combined with a divider input, and the second and third outputs of the counter zone decoder are connected to the inputs of the first and second multipliers 11, respectively.

However, the known device has a low accuracy of the analysis.

The purpose of the invention is to improve the accuracy of the analysis.

To do this, the device containing the detection unit of errors ji is a reversible counter, the input of which is connected to the output of the divider via the OR element, the second and third inputs of which are connected to the output of 1M and the first and second multipliers, sequentially connected time interval generator, summed di counter, decoder zones of the counter, the second input of which is connected to the output of the time slot generator, the third factor and the second

0 OR element, while the output of the error detection unit is connected to the combined second inputs of the summing counter and the second OR element, the output of which is connected to the input of the reversible counter layer, the input of the time interval generator is combined with the divider input, and the second and third outputs of the counter zone decoder are connected respectively

0 to the inputs of the first and second factors, six AND elements are added, the additional OR element and the NO element, the first / second and third outputs of the counter zone decoder are connected to the inputs of the third, first and second factors, respectively, through the first, second and third elements And, the combined second entrances of which. the connection of the output of the NOT element, the first output of the counter zone decoder is connected to the first inputs of the fourth element I and the fifth element I, the second input of which is connected to the third output of the counter zones deashfrator and the second input of the second connected the second output of the counter zones de-digitization and with the second input of the fourth element AND, whose output and outputs of the fifth and sixth elements AND are connected respectively to the first second and third inputs of the additional element OR, the output of which is connected to B5 of the item NOT

The drawing shows a structural electrical circuit of the proposed device.

The device for analyzing the state of the communication channel contains an error detection unit 1, the first element OR 2, the summing counter 3, the decoder 4 zones of the counter, the first, second, third fourth, fifth and sixth elements AND 5,6,7,8,9 and 10 respectively, an additional element OR 11, an element NOT 12, the first, second and third factors 13,14 and 15 respectively, the second element OR 16, a divider 17, a reversible 18, form 19 time slots.

The device works as follows.

The received signals arrive at the input of the error detection unit 1, the output of which is connected to one of the inputs of the second element OR 16. The reverse counter 18 analyzes the signals coming from the output of the second element OR 16. If after some time the difference between the number of pulses received at the summing input of the reversible counter 18 and the subtraction input from the output of the first element OR 2, exceeds a certain set number A, jro at its output, a signal indicating unsuitable for operation of the channel. The constant component of the threshold level is defined by a divider 17 with a variable division factor, to the input of which pulses are fed from the synchronous receive distributor. Summing counter 3 makes an operative assessment of the state of the communication channel by the number of errors received during the time intervals iij, the duration of which is specified by the former 19 time intervals. depending on the state

of the communication channel at the moments of the PT (nt, 2,3,. the signal from the corresponding output of the decoder 4 counter zones through the elements 5,6,7, opened by the signal from the output of the element NO 12, enters the input of the corresponding multiplier 15, 13,14 s the output of which the series of pulses, the number of which in the series is determined by the multiplier coefficient, is fed to the input of the addition or output of the reversible counter 18, determines the variable component of the spring level.

At the same time, a circuit consisting of AND elements 8, 9, 10 operates, the outputs of which are connected via serially connected elements OR 11, NOT 12 to the combined second inputs of elements AND 5, 6, 7, with the first inputs of elements AND 8.9 , the second and first input elements And 8, 10, the second inputs of elements And 10.9 in pairs are combined and connected respectively to the first, second and third output of the decoder 4 zones of the counter. Failure or malfunction in the operation of the decoder 4 zones of the counter leads to the appearance at the output of the decoder 4 forbidden combinations, a characteristic feature of which is the presence of more than one unit in the combination. As a result, at the output of one of the AND 8.9 or 10 elements (depending on the type of forbidden combination that is present at the output of the decoder 4), a signal appears which, through series-connected elements OR 11, HE 12, goes to the combined second inputs of the elements And 5,6,7, prohibiting the passage of signals from the outputs of the decoder 4 reference zones through multipliers 15,13,14 to the input of the subtraction or addition of the reversible counter 18. At the same time, the signal taken from the output of the element NO 12 is fed to the external equipment, signaling a failure About situation or malfunction in the operation of the decoder 4 zones of the counter. Therefore, in this case, the device false indications caused by a faulty situation or a 4 zone counter decoder malfunction are automatically eliminated and the device is transferred to the discrete channel quality evaluation mode using a single reversing counter 18, the input of which receives the error signals from the error detection unit 1, and To the input of the subtraction through a divider 17 with a variable division factor determining the quality requirements of the discrete channel, a regular sequence of signals from the synchronous distribution of lit l reception.

Thus, the proposed device allows to increase the reliability of assessing the quality of a discrete communication channel by eliminating faulty situations in the operation of the main functional units, which significantly improves the time-frequency characteristics of the system and reduces mutual interference of radio stations operating on the same

same band of frequencies.

Claims (1)

Invention Formula A device for analyzing the state of a communication channel by the author. No. 634461, from the fact that, in order to increase the accuracy of the analysis, six AND elements are introduced, an additional OR element and the NOT element, the first, second and third outputs of the counter zone decoder are connected to the inputs of the third, first and second multipliers respectively through the first, second and third elements And, the combined second inputs of which are connected to the output of the element NOT, the first output of the counter zone decoder is connected to the first inputs of the fourth element And the fifth element And, the second input of which is connected to the third output d encoder counter zones and the first input of the sixth AND gate, a second input coupled to the second output of the decoder counter zones and the second input of the fourth AND gate, the output 0 of which and the outputs of the pTR and the sixth elements And are connected respectively to the first, second and third inputs of the additional element OR, the output of which is connected to the input of the element NOT. Sources of infor.atsii taken into account during the examination L. USSR Author's Certificate No. 634461, Cl. N04 B 3 / 46.1977 (prototype).