Device for checking and adjustment of the regenerators of digital transmission systems

 

(57) Abstract:

The device relates to telecommunication, can be used to check and adjust the regenerators of digital transmission systems. The objective of the invention is to provide such a device in which the introduction of a new set of units of analysis error indications and interactions between them enables simple and accurate detection, analysis and display of errors and increase the accuracy of the settings and reduce the time control and adjustment of the regenerator. The device comprises a master oscillator 1, the output of which is connected to the input of the shaper pseudorandom sequence 2, the artificial line 3, the noise generator 5, the test regenerator 6, the adder 5, the recurrent filter 7, the determinant of the true error 8, the inverter 9, the first 10 and second 11 schema matching, the led 12, and the output of the shaper pseudorandom sequence 2 is connected to the input of the artificial line 3, the output of which is connected to the first input of the adder 4, the second input of which is connected to the noise generator 5 and the output of the adder 4 is connected to the input of the test regenerator 6, the output of which is connected to the input of the determinant of the true error 8, and the second you what the outcome of the second input 11 of the circuit matches the second input of which is combined with the second input of the first 10 schema matching is connected to the output of the determinant of the true error 8, and the output of the first 10 and second 11 schema matching is connected to the first and second inputs of the indicator 12, respectively. 8 Il.

The invention relates to telecommunication and can be used to check and adjust the regenerators of digital transmission systems.

Know the device the same destination.with. USSR N 692098, IPC 2 H 04 B 3/46 "Device for measuring the noise of the regenerator digital transmission systems", publ. 1978

The known device comprises a master oscillator, a sensor pseudorandom sequence, the simulator working attenuation of the regeneration section, the study regenerator. The known device also includes a shaper linear code, additive mixer, analyzer, counter, element matching, additional counter, Phaser and a control unit.

However, the described device requires a relatively large time to check investigated regenerator. This is due to the accumulation of errors in the meter and the inertia of the indicator.

Closest to the proposed Restaurante "messenger link", N 9, 1983, S. 29-31, and selected as a prototype. Structural electrical diagram of the device shown in Fig. 2. It contains a master oscillator 1, the output of which is connected to the input of the shaper 2 pseudo-random sequence, the output of which is connected to the first input of the output amplifier 3, to the second input of which is connected to the output of the noise generator 7, and the output of the output amplifier 3 is connected to the input of the artificial line 4, the output of which is connected to the input of the test regenerator 5, the output of which is connected to the input e of the oscilloscope 6.

Does the device described in the following way. Shaper pseudorandom sequence 2 under the influence of clock pulses of the master oscillator 1 generates a test signal in the output amplifier 3 is mixed with a noise signal from a noise generator 7. The test signal from the output of the amplifier 3 through the artificial line 4, simulating the attenuation of the amplitude and altering the shape of the pulses of the digital signal in real cable section nominal length, is fed to the input of the regenerator 5, to the corresponding point of which is connected electronic oscilloscope 6, which is an indicator polivaetsya to the value when the output of the regenerator 5 begin to appear failure (error). Control of the amplitude of the interference is conducted by means of electronic oscilloscope 6, which is pre-calibrated by his own calibrator or the source of reference voltage.

The known device does not allow to obtain the necessary precision setting and time control the regenerator. This is due to ineffective monitoring and tuning using electronic oscilloscope, complexity analysis of errors and lack of information about the position of the threshold of a decisive investigated regenerator 5.

The basis of the invention the task is to create such a device for checking and adjustment of the regenerators of digital transmission systems, in which the introduction of a new set of units of analysis and fault indication would allow for simple and accurate detection, analysis and display of errors and increase the accuracy of the settings and reduce the time control and adjustment of the regenerators.

The problem is solved in that the device containing the master oscillator and driver pseudorandom sequences, series-connected, the artificial line, g is, the inverter, the first and second schema matching, display, and shaper's output pseudorandom sequence is connected to the input of the artificial line, the output of which is connected to the first input of the adder, the second input of which is connected to the output of the noise generator, the output of the adder connected to the test regenerator, the output of which is connected to the input of recurrent filter, the first output of which is connected to the input of the determinant of the true error, and the second is the return to the United first input of the first circuit of the match and the input of the inverter, the output of which is connected to the first input of the second circuit matches the output of the determinant of the true error is connected to the joint second inputs of the first and second circuits match the outputs are connected to first and second inputs of the indicator, respectively.

This collection of blocks and connections between them can significantly reduce the amount of time when setting up and testing of regenerators for compliance with the parameters specified (operation and production) and improve the accuracy of the settings, as when the device is simplified analysis of errors and there is information about the position of the threshold deciding unit regenerator that p is Katara with corresponding connections enhances accuracy settings because it allows one to easily see each error, while in the known devices is hampered by the definition of rare errors.

It should also be noted that the use of the invention allows to perform a setup operation staff with lower qualifications, which leads to lower cost products.

From known sources of patent and scientific and technical information not found subject to the same destination that contains a set of essential features that match with the requested set of essential features that allows to make a conclusion on the compliance of the claimed solution to the criterion "novelty".

Analysis of the known technical solutions showed that the distinguishing features of the claimed solution separately known, but in the aggregate with other substantial evidence of their use is not known, and it is this set of features allows for the implementation of the invention to obtain a technical result, which is expressed in improving the setting accuracy and reduce the time control of the regenerator. Thus, based on the above, we believe the proposed solution meets the criterion of "inventive step".

The device comprises a master oscillator 1, the output of which is connected to the input of the shaper pseudorandom sequence 2, the output of which is connected to the input of the artificial line 3, the output of which is connected to the first input of the adder 4, the second input of which is connected to the output of the noise generator 5. The output of the adder 4 is connected to the input of the investigated regenerator 6, the output of which is connected to the input of recurrent filter 7, the first output of which is connected to the input of the determinant of the 8 errors and the second is the return to the United first input of the first circuit matches 10 and the input of the inverter 9, the output of which is connected to the first input of the second circuit matches 11, the second input of which is combined with the second input of the first circuit matches 10 is connected to the output of the determinant of the true error 8. The outputs of the first circuit matches 10 and the second circuit matches 11 is connected to first and second inputs of the indicator 12, the ACC is the operation of the device. The voltage of this frequency it is shaper pseudorandom sequence 2. A pseudo-random sequence in a linear code is input to the artificial line 3, simulating the attenuation of the amplitude and the shape change of the digital signal in real-cable station. From the output of the artificial line 3, the signal at the first input of the adder 4, the second input of which is applied the signal from the noise generator 5. From the output of the adder 4 test signal is fed to the input of the investigated regenerator 6. The input signal to the noise in the signal is a pseudorandom sequence after passing through the artificial line 3 allows to eliminate the dependence of the interference signal from the parameters of the artificial lines 3 and thereby to simplify the formation of the test signal. From the output of the regenerator 6 regenerated signal is a pseudorandom sequence is fed to the input of recurrent filter 7. The first output of recurrent filter 7 in case of failure of the regenerator 6 pulses appear error, which is fed to the input of the determinant of the true error 8. It is known that recurrent filter has the characteristic of the propagation of errors. Remove excess errors allows the determinant of ISA true errors are received on the second input of the first circuit matches 10 and the second circuit matches 11. From the second output of recurrent filter 7 to the first input of the first circuit matches 10 and the input of the inverter 9 arrives delayed by the time required for the operation of the determinant of the true error 8, a pseudo-random sequence. From the output of the inverter 9 inverted delayed pseudo-random sequence is supplied to the first input of the second circuit matches 11. The first scheme matches 10 produces a signal at its output in case of coincidence in time of the signal of the true error and "unit" pseudo-random sequence. Therefore, the first input of the indicator 12 will be information about the erroneous admission of a "unit" (low threshold deciding unit investigated regenerator 6). The second scheme matches 11 produces a signal at its output in case of coincidence in time of the signal of the true error and "unit" inverse pseudo-random sequence. Therefore, the second input of the indicator 12 will be information about the erroneous admission of "zero" (inflated the threshold of a decisive investigated regenerator 6).

When checking the parameters of the regenerator 6, the noise level is changed manually or automatically from zero to a certain value at which the output of the regenerator 6 and n the/P> When configuring the regenerator 6, increasing the level of interference achieve error at the output of the regenerator 6. The indicator device 12 indicates how to change the threshold of a casting device of the regenerator 6 to obtain error-free operation of the regenerator 6. Increasing the level of interference and changing the threshold of a casting device of the regenerator 6, determine the optimal threshold value deciding device, i.e. this value, with any change in the output of the regenerator 6 errors.

Let as a test signal uses a pseudo-random sequence of length 24-1. Generator 2 pseudo-random sequence in this case is implemented by four delay lines and modulo 2, as shown in Fig. 3. Recurrent filter 7 and the determinant of the true error 8 are implemented in accordance with Fig. 4 and Fig. 5, respectively. Recurrent filter 7 "raise" error scheme And the determinant of the true error 8 "collects" reproduced in recurrent filter 7 errors.

The output of the determinant of the true error 8 get the single (nerazmotanny) pulse errors, delayed by the delay time of the four delay lines. Compared the full-time impulse in a pseudo-random sequence, that increases the accuracy of the device.

Device for checking and adjustment of the regenerators of digital transmission systems containing the master oscillator, the output of which is connected to the input of the shaper pseudo-random sequence, the artificial line, the jammer, the test regenerator, characterized in that it introduced the adder, recurrent filter, the determinant of the true error, the inverter, the first and second schema matching, display, and shaper's output pseudorandom sequence is connected to the input of the artificial line, the output of which is connected to the first input of the adder to the second input of which is connected to the noise generator and the output of the adder connected to the input of the test regenerator, the output of which is connected to the input of recurrent filter, the first output of which is connected to the input of the determinant of the true error, and the second is the return to the United first input of the first circuit of the match and the input of the inverter, the output of which is connected to the first input of the second circuit matches the second input of which is combined with a second input of the first circuit matches, connected to the output of the determinant of the true error, and outputs the first and second schema matching is attached to pen the

 

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