RU2119251C1 - Remote-control device for digital information transmission lines - Google Patents

Abstract

FIELD: communications engineering; systems for transmitting digital data over metal and fiber-optic cables or radio- relay channels. SUBSTANCE: device that has data signal source, pseudorandom train generator, first and second commutators, control unit, first pseudorandom train analyzer, and storage element on each terminal station as well as forward and reverse regenerators and, respectively, artificial line, storage element, switch on each intermediate station, is provided, in addition, with third commutator, second and third pseudorandom train analyzers, error indicator all introduced in terminal station as well as fourth commutator included in intermediate station. Third and fourth commutators enable forming pseudorandom train generator and analyzer with commutation structure; remote-control signals are presented by pseudorandom trains of different lengths. Remote-control signal is transmitted over same circuit as working signal dispensing with transmission channel for diagnostics. Remote- control command receiver and transmission characteristics analyzer used during remote control are built around same pseudorandom train analyzer. Test-signal generator functions at the same time as remote-control command shaper and is made in the form of pseudorandom train generator. Remote-control device is suited for any digital information transmission system irrespective of line transmission code. EFFECT: simplified design, improved accuracy, and enlarged functional capabilities. 7 dwg

Description

 The alleged invention relates to communication technology and can be used to build discrete information transmission systems both via metal cables and radio relay paths and fiber optic cables (FOC).

 Known television monitoring devices for detecting a faulty area of regeneration of digital data transmission lines (AS USSR N 1117845, MKI H 04 B 3/46, published October 7, 1984 and AS USSR N 1185620, MKI H 04 B 3 / 46 published on 10/15/85).

 The devices listed in these copyright certificates allow you to find the place of damage in the digital information transmission lines, but have significant drawbacks: for telecontrol, command transmission to organize a loop, you must have a phantom or other circuit with the ability to reverse the remote power supply. In addition, the time to detect a faulty regeneration section is too long, since in order to determine the health of the path it is necessary to carry out a check, starting from the first unattended regeneration point, to check all the regeneration sections of the tract.

 Other analogs of the alleged invention may be the telecontrol devices described in a. from. USSR N 951731, MKI H 04 3/14, published on 08/15/82, and a. from. USSR N 1035812, MKI H 04 B 3/46, published on 08/15/83. The disadvantages of the first device include the difficulty of phasing the transmitted and received test signals, since a failure of the test signal leads to the out-of-phase voltage coming to the inputs of the comparison unit. In addition, the accuracy of such a device is small in the presence of jitter of the phase of the received signal in the range specified by the relevant CCITT recommendations. The accuracy of determining the reliability of the second device is also low. So the disappearance of one information symbol and the appearance of another false on the selected time interval will not lead to detection by the counter of an error, although there were two of them.

 The closest in technical essence to the proposed solution is a device for monitoring the linear paths of digital transmission systems (a.s. USSR No. 1040612, MKI H 04 B 3/46, published September 7, 83), containing an information signal source at each terminal station, first switch, pseudo-random sequence generator (GPSP), control unit, controlled code converter, fixed-combination decoder, variable division divider, bipolar disturbance analyzer, pseudo-random analyzer A research unit (APS), a second switch, a counter, the first and second memory elements, and at each intermediate station a forward direction regenerator, a reverse direction regenerator, an artificial line, a memory element, a key, a bipolarity disturbance detector and a linear bipolarity disturbance analyzer, with each terminal station, the source of the information signal and the GPS is connected with its outputs to the information inputs of the first switch, the output of which is connected to the first input of the managed code converter, the output of which is connected to the linear path, the detector of bipolarity and APSP disturbances, the inputs of which are combined and connected to the linear path, the output of the APSP is connected to the first input of the second switch, the second input and output of which are connected respectively to the output of the detector of bipolarity disturbances and to the counter counter input, outputs which are connected to the first and second inputs of the control unit, the service inputs of the first and second switches are connected to the corresponding outputs of the control unit, and to the clock input of the counter and APSP clock pulses are applied, in addition, the output of the first switch through a series-connected decoder of a fixed combination and a divider with a variable division coefficient, the installation inputs of which are connected to the corresponding outputs of the control unit, is connected to the second input of the managed code converter, the installation input of which is connected to the corresponding input of the unit control, and the first, second and third inputs of the analyzer of bipolarity disturbances are connected respectively to the output and inputs of the detected bipolarity disturbances, and the first, second, third, fourth and fifth outputs of the bipolarity disturbance analyzer are connected respectively through the first and second memory elements to the third and fourth inputs of the control unit and to the fifth input of the control unit directly, the corresponding outputs of which are connected to the installation inputs of the violation analyzer bipolarity and counter, the input of the device is the input of the information signal source, and the output is the input of the linear path of the terminal station, at each intermediate station there is a regenerator a forward direction torus, the outputs of which are connected through an artificial line to the inputs of a reverse direction regenerator, a memory element, whose output is connected via a key to a switching input of an artificial line and to another input of a reverse direction regenerator, the inputs of a bipolar disturbance detector are connected to the outputs of a forward direction regenerator and to the first and the second inputs of the linear analyzer of violations of bipolarity, the third input and outputs of which are connected respectively with the timing output of the regenerator in the same direction and with the inputs of the memory element, and the fourth input of the linear analyzer of bipolarity disturbances is connected to the output of the detector of bipolarity disturbances, the forward and reverse regenerators being connected to the linear path.

 The disadvantage of this device is its limited scope, since its operation is associated with a specific linear code (quasi-ternary), the structure of which is violated by a certain law.

 Moreover, the accuracy of determining the faulty regeneration section is low due to various conditions for transmitting PCM signals in a quasi-ternary code during the operation of the transmission system and in the monitoring mode with a quasitroic code containing some structural violations. The device operates with a linear code converter, which, by changing the structure of the linear signal, complicates the operation of the correction device of the PCM signal regenerator, while the frequency response of the corrector becomes non-optimal and the noise immunity of the regenerator is degraded. T.O. The conditions for signal recovery by the regenerator in the operating mode and in the telecontrol mode are different and not optimal in the diagnostic mode, which can lead to the failure to identify the regeneration section that normally works with the working signal. The last remark is especially important if measures are not taken to balance such a modified code. In addition, the disadvantages of the described device include its complexity.

 The basis of the invention is the task in the control device for transmission lines of digital information by introducing new units and interconnections in the terminal and intermediate stations while simplifying the device to provide increased accuracy of the control and the ability of the device to operate as part of various transmission systems regardless of the linear code used, as a result of which it expands scope of its application.

 The problem is solved in that a telecontrol device for digital information transmission lines, containing at each terminal station an information signal source, GPS, the first and second switches, a control unit, the first APSP, a memory element, at each intermediate station, forward and reverse generators, an artificial line, a memory element, a key, and at the terminal station the outputs of the source of the information signal and GPS are connected respectively to the first and second information inputs of the first switch ora, the output of which is connected to the linear path, the first input of the first APSP is connected to the output of the linear path, the output of the memory element is connected to the first input of the control unit, the first output of which is connected to the fourth input of the first switch, the input of the device is the input of the information signal source, and the output is the input of the linear path of the terminal station, and at the intermediate station the first output of the forward direction regenerator is connected to the first input of the reverse direction regenerator through the first input of the artificial line, the output of nta memory through a key is connected to the switching input of the reverse direction regenerator and the second input of the artificial line, while the forward direction generator is input and the first output, and the reverse direction regenerator is connected to the terminal and intermediate stations by the second input and output, according to the invention, the following are entered into the terminal station: the third switch, the second ATS and an error indicator, and the third station, the third APS and the fourth switch, and at the terminal station, T APSP swarm with its first input is connected to the output of the linear path and to the third input of the first switch, and the second input is connected to the output of the third switch, the output of the second APSP is connected to a memory element, the first and second outputs of the second switch are respectively connected to the input of the GPSP and the second input of the first APSP whose output is connected to the input of the error indicator, the third output of the second switch is connected to the second input of the control unit, the second output of which is connected to the fifth input of the first switch, at the intermediate station th output regenerator forward direction and the fourth output of the switch are respectively connected to the information inputs of the third and the mounting CRR whose output is connected to an input of memory element.

 Simplification of the proposed telecontrol device compared to the prototype is achieved using the introduced blocks of the third and fourth switches, which set the “length” of the GPS and APS registers, while the command transmission device for organizing the GPS cable is simultaneously a source of information signal in the diagnostic mode, and the command receiving device to organize the loop of the station under test, the device for receiving and evaluating the quality of transmission over the looped area is also performed on the same device - APSP. A linear code converter, a bipolarity violation analyzer and a fixed combination decoder in the proposed device are thus not needed.

 Such an implementation of a telecontrol device for digital information transmission lines does not require, in addition, a separate channel or circuit for transmitting receipts from unattended stations.

 An increase in the accuracy of telecontrol in the proposed device is provided by the introduction of GPS and APSP with a switched structure, which allows you to work with pseudorandom sequences of different lengths, the structure of the linear signal does not change, the frequency response of the regenerator corrector is optimal, the noise immunity of the regenerator is stable. The conditions for signal recovery by the regenerator in the operating mode and the telecontrol (diagnostic) mode are the same.

 The proposed telecontrol device can work in any transmission system using not only quasitroonic codes as linear, i.e. the scope of its application is expanding.

The invention is illustrated by drawings, where:
figure 1 shows the functional diagram of the proposed device;
in FIG. 2 - functional diagram of the inclusion of the third and fourth switches;
figure 3 is a functional diagram of the inclusion of the second switch;
figure 4 is a functional diagram of a control unit;
figure 5 is a functional diagram of the first switch;
figure 6 is a functional diagram of a memory element;
7 is a functional diagram of an error indicator.

 A telecontrol device for digital information transmission lines contains at each terminal station 1: an information signal source 2, a pseudo-random sequence generator 3, a first switch 4, a second switch 5, a control unit 6, a third switch 7, a memory element 9, the first and second pseudo-random sequence analyzers 8 and 10, respectively, the error indicator 11, and at each intermediate station 12, the forward and reverse regenerators 13 and 19, respectively, the fourth switch 14, the third pseudo-analyzer learning sequence 15, memory element 16, key 17, artificial line 18, while at terminal station 1 the outputs of the information signal source 2 and GPS 3 are connected respectively to the first and second inputs of the first switch 4, the output of which is connected to the linear path, the first input of the first the pseudo-random sequence analyzer 8 is connected to the output of the linear path, the output of the memory element 9 is connected to the first input of the control unit 6, the first output of which is connected to the fourth input of the first switch 4, the second APSP 10 s the first input is connected to the output of the linear path and to the third input of the first switch 4, and the second input is connected to the output of the third switch 7, the output of the second APSP 10 is connected to the memory element 9, the first and second outputs of the second switch 5 are respectively connected to the input of the GPSP 3 and the second input of the first APSP 8, the output of which is connected to the input of the error indicator 11, the third output of the second switch is connected to the second input of the control unit 6, the second output of which is connected to the fifth input of the first switch 4, at the intermediate station the first output of the forward direction regenerator 13 through the first input of the artificial line 18 is connected to the first input of the reverse direction regenerator 19, the output of the memory element 16 through the key 17 is connected to the switching input of the reverse direction regenerator 19 and the second input of the artificial line 18, the second output of the forward direction regenerator 13 and the output of the fourth switch 14 is connected respectively to the information and installation inputs of the third APSP 15, the output of which is connected to the input of the memory element 16, while the regenerator is direct of the 13th direction by the input and the first output, and the reverse direction regenerator 19 by the second input and the output are sequentially included in the linear path connecting the terminal and intermediate stations, the device input is the input of the information signal source 2, and the output is the input of the linear path of the terminal station 1. As the linear path can be radio-relay or cable with metal or optical cores, regardless of the applied linear signal code.

 GPSSP 3 and APSP 8, 10, and 15 can be performed according to well-known schemes based on shift registers similarly to the corresponding devices in the prototype, and the change in the length of the pseudo-random sequence is carried out by connecting a certain number of triggers in the registers using the second 5, third 7, and fourth 14 switches. The third and fourth switches 7 and 14 are functionally the same and can be implemented, for example, by setting jumpers.

 Functional diagram of the switches 7 and 14 are presented in figure 2. The second switch 5 can be implemented, for example, using a push-button switch, and the installation of the GPS and the first APSP is carried out in the same state, which allows you to check the signal passed through the loop of the GPSS for recurrence by the first APSP. When you turn on the second switch on its third output, a control signal is generated for the control unit 6.

 Functional diagram of the second switch is presented in figure 3. The control unit is implemented on the keys, switched depending on the presence of signals from a memory element or a second switch on their control inputs so that direct current signals for operation of the first switch appear on its outputs.

 Functional diagram of the control unit is presented in figure 4.

 The first switch can be implemented using a simple relay circuit, which, depending on the availability of control signals, switches one of the input signals to its output into the linear path.

 Functional diagram of the first switch is presented in figure 5. The memory element 16 may be implemented on an RC circuit with a selected time constant. The functional diagram of the memory element is presented in Fig.6.

 Error indicator 11 can be implemented as an LED, the input of which receives pulses from the APSP output, formed by a single-vibrator for the convenience of visual observation, and sockets for connecting an error counter. The functional diagram of the error indicator block is presented in Fig. 7.

 The device operates as follows. In the conditions of the passage of the working information signal from the input of the terminal station 1 through the source of the information signal 2, the first switch 4 passes it into the linear path. At each intermediate station 12, the third APSP 15 checks the output signal of the regenerator 13 for recurrence and, if it does not find a pseudo-random sequence of a given length in it, it does not loop through the memory element 16 and key 17 with a loop of the received signal through an artificial line 18 and regenerator 19. At the next terminal station the information signal from the output of the linear path is fed to the output of the station and in parallel to the APSP 10 to check for recurrence of the received signals. As in the APSP 10 intermediate station, having not detected "its" pseudo-random sequence, it generates pulses with a sufficiently high repetition rate at its output so that the memory element 9 through the control unit 6 does not create conditions for closing the loop of the remote terminal station 1 using the first switch 4. GPSSP 3 and error indicator 11 do not work.

 In diagnostic mode, to check the entire linear path or any regeneration section by switching on the second switch 5 at the terminal station 1, the GPSS 3 is started, and the control unit 6 acts on the first switch 4, as a result of which, instead of an information signal, the signal from block 3 enters the linear path In addition, the second switch 5 sets a certain length of the pseudo-random sequence of GPSS 3 and the corresponding scheme of the first APSP 8. Now, if the signal returns to terminal station 1 via the loop, APSP 8 will t to check the quality of the checked section for violation of the structure of the pseudo-random sequence, and the error pulses are indicated by the error indicator 11.

 To loop N-th intermediate station 12, the second switch 5 sets the GPS 3 and APS 8 in the mode of operation with a pseudo-random sequence of a certain length corresponding to the N-th intermediate station 12, while in line on the N-th intermediate station using the fourth switch 14 APSP 15 is also set to work with a pseudo-random sequence of the same length. Then block 15 detects “its” pseudo-random sequence and the corresponding signal at its output through memory element 16, key 17, artificial line 18 provides loop closure from the forward direction regenerator 13 through the reverse direction regenerator 19 towards the terminal station 1, where, as described above , the received signal is received and analyzed by the ATS units 8 and the error indicator 11. The signal from the subsequent N + 1-st intermediate station is disconnected from the reverse direction regenerator.

 For the loop of the N + 1st intermediate station, the GPSP 3 and APSP 8 are switched by the second switch 5 to a mode of operation with a pseudo-random sequence of a different length, and the APSP 15 in the N + 1st intermediate station of the fourth switch 14 is set to work with this pseudo-random sequence.

 To implement the loopback of the remote terminal station 1, the second switch 5 sets GPSS 3 and APSP 8 to the testing station in the same way as in the case of checking the intermediate station, in the mode of operation with a pseudo-random sequence of a certain length. The second APSP 10 at the test station 1 is set by the third switch 7 to a state corresponding to the state of the GPSP 3 at the test station, for example, when the entire path is looped, work is performed with a pseudo-random sequence of 2 ^ 15-1 clock intervals recommended by CCITT as a test signal for the transmission speed 2048 kbit / s. The signal received by the remote terminal station 1 by the second APSP 10 and memory element 9 is processed in the same way as in the intermediate station 12 and, acting through the control unit 6 on the first switch 4, disconnects the information signal from the linear path and transmits the received signal back to the testing station, organizing plume. The quality of the received signal is also evaluated by checking for recurrence by block 8 and error indication by block 11.

Claims (1)

 A telecontrol device for digital information transmission lines, containing at each terminal station an information signal source, a pseudo-random sequence generator, first and second switches, a control unit, a first pseudo-random sequence analyzer, a memory element, at each intermediate station: forward and reverse regenerators, an artificial line , a memory element, a key, and at the terminal station the outputs of the information signal source and the pseudo-random sequence generator the components are connected respectively to the first and second inputs of the first switch, the output of which is connected to the linear path, the first input of the first pseudo-random sequence analyzer is connected to the output of the linear path, the output of the memory element is connected to the first input of the control unit, the first output of which is connected to the fourth input of the first switch, and at the intermediate station, the first output of the forward direction regenerator is connected to the first input of the reverse direction regenerator through the first input of the artificial line, the output of the memory element through a key is connected to the switching input of the reverse direction regenerator and the second input of the artificial line, while the forward direction regenerator is input and the first output, and the reverse direction regenerator by the second input and output are sequentially connected to the linear path connecting the terminal and intermediate stations, characterized in that a third switch, a second pseudo-random sequence analyzer and an error indicator are introduced into the terminal station, and a third analysis is introduced into the intermediate station a pseudo-random sequence ator and a fourth switch, and at the terminal station, the second pseudo-random sequence analyzer with its first input is connected to the output of the linear path and the third input of the first switch, and the second input is connected to the output of the third switch, the output of the second pseudo-random sequence analyzer is connected to the memory element, the first and the second outputs of the second switch are respectively connected to the input of the pseudo-random sequence generator and the second input of the first analysis An oracle of a pseudo-random sequence whose output is connected to the input of the error indicator, the third output of the second switch is connected to the second input of the control unit, the second output of which is connected to the fifth input of the first switch, the device input is the input of the information signal source, and the output is the input of the terminal terminal line path, at the intermediate station, the second output of the direct voltage regenerator and the output of the fourth switch are connected respectively to the information and installation inputs of the third analyzer ps a random sequence whose output is connected to the input of a memory element.

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