SU422111A1 - - Google Patents

Description

one

The invention relates to measurement techniques for transmitting binarial information and can be used in developing, adjusting and installing hardware and channels for transmitting binary information, as well as for coitrole the state of such equipment and channels during their eqiration.

At present, in accordance with the recommendations of the CCITT, the reliability of transmission of binary information is being measured by the transmission channel to the pseudo-random test text, which is generated by a linear shift register with one or more iolusmatmators in the feedback circuit.

Such a test text generated by the / g-bit register has a period of 2 - 1 and contains all / g-bit binary code combinations except zero, which makes it possible to effectively use it for the control of reliability.

The known reliability control devices consist of a transmitter part comprising a test text sensor and a receiver part which includes a similar test text sensor, an input unit and a comparison unit. In addition, by accepting a part to contain a synchronization unit and a pulse shaper for the comparison unit.

According to the results of measurement of reliability

With iomopts about lime devices you can liip. say whether the number of failures exceeded the actual value or not. Due to the large period of the test text, using an electronic oscillograph x, it is practically impossible to determine the actor of failures and indications of impulses at different points of the caustic-forming equipment in order to remove defective nodes. Therefore, after registering a violation of certainty, they usually start working and study the passage of various static code combinations on a defective communication channel in order to find the most difficult combination for it, and then to determine the damaged or poorly pastoral node of the forming equipment using an electronic oscllograph of a damaged or poorly pasted unit his work and this combination.

Since the most difficult for this channel code combination depends on the amplitude-frequency and phase-frequency characteristics of the channel and the type and damage, and is not known in advance, additional hardware (static combination sensor) and additional time are needed to find it.

The purpose of the present invention is to reduce the time of adjustment of the communication channel.

This is achieved by automatically locating odiovremeino with measuring the reliability of the probability distribution of the affected code combinations and fixing the combination of the code combination that is most unfavorable for the tested drop.

The proposed device differs from the code combinations known for having a decoder, connected to the outputs of the bits of the shift register included in the test text sensor; In this case, the output of the block is compared to the control input of the decoder, and the outputs of the decoder are connected to the inputs of counters of code combinations. Thus, the output of each bit of the shift register through the depot is connected to the corresponding counter of code combinations.

The drawing shows a block diagram of the receiving part of the proposed device for determining the reliability of transmission of binary information.

The device contains an input unit /, a pulse former 2, a comparison unit 3, a test text sensor 4, comprising a shift register 5, a synchronization unit 6, a decoder 7 code combinations, counters 8i-S code combinations.

The operation of the device in the search and synchronization modes for clock cycles and cycles does not differ from the operation of the known devices. In the mode of trustworthiness measurement, the proposed device works in the following way.

If in the reliability measurement mode a binary symbol received from the communication channel by the input unit / does not coincide with biAi1d1 with the symbol and output of sensor 4 and test text, iia output of unit 3 is at the moment of filing PA this impulse unit with B1 1 input of imager 2 imiolov there is a pulse. This pulse fails, first, to the fault counter, and secondly, the control, the input of the decoder of the combination codes, allowing it to work. At this moment, one of the outputs of the decoder corresponding to the content in the shift register of the code combinations, a signal appears that, on the other hand, the input of the corresponding counter 5i-5 "code combinations, increases its readings on the output.

Consequently, at the end of the session, due to the degree of confidence in the counters 8 - 3, the distribution of the affected code combinations will be recorded. If one of

Since these counters exceed the indications of the others, then the code combination corresponding to this counter is the most unwholesome for the channel being checked, and working but setting up and adjusting the channel-forming

Air traffic control must be carried out when transmitting via the channel of the combination.

It is not necessary to connect all bits of the shift register to the decoder. The length of the code combinations under study (and, consequently, the number of register bits used and the number of inputs and outputs of the decoder are 7 code combinations and counters, 1 code combinations) should slightly exceed the length of the channel impulse response.

N odeme

A device for determining the credibility of binary information containing

the input unit connected to the cpaBiieia unit and the synchronization unit, the output of which is connected to one input of the unit is compared through the pulse shaping unit, and to the other through the sensor of the text test, consisting of 1CTI of the shift register with the orthous matrices in the reverse link, is different (It is due to the fact that for the purpose of en1, enn time for adjusting communication kiaal, the output of each bit of the shift register through de jifter code combinations is INII and connected to the corresponding code combination counter, but it doesn’t need to connect to the code combos. tions sravpeii connect the output unit.