SU1467764A1 - Method and apparatus for monitoring a transmitting system - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to improve the accuracy of determining the nature and location of the malfunction. A device that implements the method contains end points (OP) 1 with their control units 6, intermediate points (PP) 2 with their control units 5 and with amplifiers 3 and 4 transmit and receive, as well as a telecontrol channel. A code selection of a plurality of states of equipment of PP 2 is carried out, which is converted into the corresponding frequency modeled by code of PP number 2. The absence of a working signal at the inputs and outputs of a point is typical for all PP 2, therefore, the removal of uncertainty is accomplished by sequentially blocking the output of signals causing a circuit failures on the subsequent PP 2. Due to this, OP 1 is able to analyze not only the location of the transmission system malfunction (PP number 2), but also the nature of the malfunction: amplifier 3 failure whether 4, no signal at the amplifier input 3 and 4, v. e. failure to linearly cable structures x, fire and burglar alarm and others. s.p.f 2 BACKGROUND 3-yl. (L

Description

Fiel

The invention relates to telecommunications and can be used to determine the nature and location of a malfunction at intermediate points of long-distance transmission systems.

The purpose of the invention is to improve the accuracy of determining the nature and location of the malfunction.

FIG. Figure 1 shows the electrical structure of the transmission system; in fig. 2 is a structural electrical circuit of the intermediate point control unit; on fi g. 3 is a structural electrical circuit of an end point control unit.

An apparatus for implementing a method of monitoring a transmission system comprising terminal 1 and intermediate 2 points, amplifiers 3 transmissions and amplifiers 4 receptions, contains at each intermediate point 2 a block 5 of the intermediate point control, at each end point 1 block 6 of the control of the end point, as well as a channel 7 telecontrol, each intermediate control unit 5 consists of the first 8.1, the second 8.2, the third 8.3 and the fourth 8.4 control unit of the working signal, a digital-to-analog converter (DAC) 9, a signal generator 10, a computer rator 11, modulator 12, encoder 13, matching unit 14 and frequency converter 15 are voltage, and each terminal control unit 6 consists of a selection unit 16, frequency converter 17 is voltage, a synchronous detector 18, analog -digital converter (ADC) 19, signal generator 20, decipheror 21. fault register 22, address register 23 and registrar 24.

The essence of the proposed method lies in the fact that a code selection of the states of the intermediate point equipment is carried out, which is converted into the corresponding frequency modeled by the intermediate point number code. Some of these states (for example, the absence of a working signal at the inputs and outputs of a point) are characteristic of all intermediate points, so the elimination of uncertainty is accomplished by successively blocking the output of signals causing a chain of failures at subsequent intermediate points.

Due to this, it is possible at the end points to analyze not only the location of the transmission system malfunction (intermediate point number), but also the nature of the malfunction: the failure of the transmitting or receiving amplifier, the absence of a signal at the amplifier inputs, i.e. fire alarm systems, etc. In addition, information on the state of the entire transmission system can be transmitted to both end stations, which significantly expands

the capabilities of the operational control systems, the possibility of placing the automated control at the nodes of the communication system, is expanding control information from the workarounds.

A device for carrying out the proposed method works as follows.

At the intermediate points 2 of the transmission system, the state of passage of the working signal at the inputs and outputs of the 3rd transmission amplifiers and the 4th reception amplifiers is constantly analyzed. Blocks 8 continuously check the operating signal level and, when the signal is too low or too high, they generate logic signals that are fed to the inputs of the DAC 9, and signals from other blocks (not shown) of the intermediate points control (for example, remote control) are also sent to its other inputs. power supply, burglar alarm control, fire alarms, etc.), and the logical control signals corresponding to the normal state of the workable intermediate point 2 correspond to the output of the analog / digital converter DAC 9 Nala, blocking the generation of the generator 10 whatever was frequency. When changing any of the parameters of the control units at the inputs of the D / A converter 9, the state of the potentials changes, thereby generating the corresponding control analog voltage at the output of the DAC 9, which controls the frequency of the generator 10. To distinguish the nature of the malfunction of the intermediate points 2, i.e. their locations in the transmission system, the generation frequency of intermediate points 2 are modulated by parameter (amplitude or phase) on modulator 12 by the number of intermediate point 2 (known in advance for this point) produced by the encoder 13, the latter generates its signals cyclically at regular intervals of time. The coded modulation signals of different frequencies through the matching block 14 are transmitted to the monitoring channel 7, which transmits information about the state of intermediate points 2 to end point 1. At the same time, the loss of the working signal at one of the intermediate points 2 causes the working signal to disappear at subsequent intermediate points 2, and its display at terminal point 1 is meaningless, therefore, at each intermediate point 2, the signals transmitted on channel 7 through the matching block 14 are monitored atel 15. If the frequency of the signal generated previous intermediate point 2, coincides with the frequency generated its generator 10, the inputs to comparator 11 are compared to the same potentials developed by the DAC 9 and the inverter 15, and at their equality blocking

the signal of comparator II prohibits the generation of generator 10. Thus, the uncertainty of unambiguous information from different intermediate points 2 is removed.

At endpoint 1 of channel 7, through selection block 16, the modulated signals of different frequencies are fed to the inputs of converter 17 and synchronous detector 18, and on converter 17 the frequency of the signal is converted to the corresponding voltage, which again converts to the same frequency in generator 20, t That is, the modulated frequency and the unmodulated frequency are supplied to the two inputs of the synchronous detector 18, thereby allowing the output of the synchronous detector 18 to produce modulation moments that are decoded by the decoder 21 address register 23 are stored.

The value of the voltage converter 17 outputted at the output is measured by the A / D converter 19, and the corresponding code value is written to the fault register 22.

The output bits of the registers 22 and 23 are connected to the recorder 24, which can be used as a microprocessor registration system. Such a system at the terminal point can be connected to many transmission systems, information retrieval from which via the data bus (SM) is performed using the address bus (ША) and control bus (ШУ) selectively or sequentially. For this, the signals "Receive and Record from LUy" are fed to inputs K and C of registers 22 and 23 to store the state of this transmission system. The generation of signals K and C is carried out cyclically (from its own timer or external time store) according to the program.

This fixes the status of all intermediate points 2 of the transmission systems served by this end point 1.

Claims (2)

1. A method of controlling the transmission system, which consists in the fact that at each intermediate point, when a fault is detected, a signal of the corresponding fixed frequency is generated, which is identified at the end point, and the fault value is located, in order to increase the accuracy of character determination and the location of the malfunction, at each intermediate point, the results of the control units of the transmission system and the operating signal parameters at the inputs and outputs of this intermediate point are converted into controls voltage simultaneously highlight signals about malfunctions of the previous via points, which convert to the corresponding voltage of their fixed frequencies, which are compared with the control voltage, and, if they coincide, block the generation of the signal of the corresponding fixed frequency of this intermediate point, and if there is a mismatch, they convert the control voltage Q corresponding to a fixed frequency, modulated by its signal corresponding to the number of this intermediate point, and transmitted to the channel by a telecontrol, and at each end point each selected frequency is converted into voltage, measured 5, the nature of the fault is determined by its measured value, at the same time the signal of each frequency is demodulated, and the number of the intermediate point is determined by the demodulated signal. 0 2. The control device of the transmission system, which contains a telecontrol channel, at each intermediate point is a signal generator, and at each end point is a selection unit and a recorder, different 5 in that the first to fourth work signal control units, a digital-to-analog converter, an encoder and a serially connected modulator, a matching unit, a frequency-voltage converter are introduced at each intermediate point 0 and a comparator, and at each end point - serially connected frequency-voltage converter, analog-digital converter, fault register and serially connected signal generator, synchronous detector, de5 encoder and address register, with each intermediate point having output from the first to fourth The control blocks of the operating signal, whose inputs are the inputs of the input and output signals of the transmit and receive amplifiers, respectively, of the control device of the transmission system are connected One to the first to fourth inputs of a digital-to-analog converter, the corresponding inputs of which are alarm inputs 5 blocks of the transmission system; the output of the digital-to-analog converter is connected to the signal input of the signal generator and the second input of the comparator, the output of which is connected to the inhibit input of the signal generator, the output of which is connected to the first input of the modulator, the second input of which is connected to the encoder output, the second input and the output of the matching unit is connected respectively to the output and to the input of the telecontrol channel, and at each end point the output of the selection unit, the input of which is connected to the output of the telecontrol channel, is connected to the second input of the synchronous detector and the input of the frequency-voltage converter, the output of which is under0 five It is connected to the input of the signal generator, and the outputs and control inputs of the failure register and the address register are connected respectively to the corresponding signal inputs and control outputs of the recorder. From d loko8 transmission system Phie. 2 Fi8. five