SU1418915A1 - Device for remote control of linear regenerators - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to improve the accuracy of control. The device contains at the terminal station I a transmitter 2 of the digital transmission system, a receiver 3 of the digital transmission system, a fault recorder 4, a switch 5 of the remote power supply (DP). D11 current modulator 6, source 7 DC and matching transformers 8 and 9 of the transmitting and receiving paths, and at each intermediate station 10: regenerators 11 and 12 of the transmitting and receiving paths, diodes 13, 17 and 18, receiver 14 modulation pulses, v A bridge rectifier 15, a transistor 16, a two-relay switch 19, consisting of and control relay 20 and relay 21 with a break contact 22, and a switching unit 23, the goal is achieved by detecting almost any damage in the linear path, including cable damage, 1 or . (L

Description

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The invention relates to telecommunications and can be used in digital transmission systems (DSPs) for remote control of regenerators installed in unattended intermediate stations (PS).

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

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

The device for remote control of linear regenerators contains at the terminal station 1 transmitter 2 DSPs, Receiver 3 DSPs, a malfunction recording unit A, a remote power supply (PD) switch 5, a DP current modulator 6, a DP source 7, a transmitting matching transformer 8 and a matching transformer 9 of the receiving path, and at each intermediate station 10 - the regenerator 11 of the transmitting path, the regenerator 12 of the receiving path, the first diode 13, the receiver 14 of the modulation pulses, the bridge terminal 15, the transistor 16, the second and third Iodines 17 and 18, a two-relay switch 19, which includes a control relay 20 and an additional relay 21 with opening I contact 22, a switching unit 23.

The device works as follows.

During normal operation in the PS of controlled regenerators 11 and 12 of the transmitting and receiving paths, the polarity of the remote supply current (PD) is such that the two-relay switch 19 and all other elements of the remote control in all PS are de-energized. If it is necessary to check the controlled regenerators 11 and 12 of the transmitting and receiving paths in the first PS 10 at the terminal station 1, the reversal of the PD with the help of the switch 5 of the DP. At the same time, the control relay 20 of the double relay matches. switch 19 in the first PS 10 along the circuit: plus PD at the midpoint of the linear winding of the matching transformer 8 of the transmission path, output of the AC circuit of the regenerator 1I of the transmission path, winding of the control relay 20, diode 21, break contact 22 of the auxiliary relay 17 , the input circuit of the DP of the regenerator 12 of the receiving path, minus the PD at the midpoint of the linear winding of the matching transformer 9 of the receiving path. By operating, controlling the relay 20 with its contacts in the switching unit 23, made in the form of an RC quadrupole, simulating a cable section through which the linear DSP regenerator can work normally, connects the output of the transmitting path regenerator 1I to the input path of the regenerator 12 of the receive path. At the same time, the regenerators and remote control devices of all subsequent PSs are de-energized due to the shorting of the DP current in block 23 of the mutation in the first PS. Since the power supply circuits of the regenerators 11 and 12 are connected to the AC circuit through the bridge rectifier 15, the regenerators are powered in the desired polarity for any polarity of the AC current at the output of the 5 DP switch of the terminal station 1. In the first HC 10 through the open diode 17 it enters power to the receiver 14 pulses of modulation of the current DP. The receiver 14 may be provided, for example, in the form of a transistor switch on an RS flip-flop. Between the base and the emitter of the transistor switch, a resistor is connected, through which a part of the AC current flows. The output of the transistor switch is connected to the RS-flip-flop input. When the AC current in the line is reversed, the transistor switch in the receiver 14 is open (logic O), the high potential (logic 1) at the output of the RS-flip-flop opens the transistor 16 that shunts the auxiliary winding of the additional relay 21, preventing it from tripping. Thus, at the first intermediate station 10, a control relay 20 operates, the output of the regenerator 11 of the transmitting path is connected to the input of the regenerator 12 of the receiving path. At terminal station I, using transmitter 2 and receiver 3, the work is performed on a linear path loop at the end station 1 — first intermediate station 10. In the event of damage to any elements of the linear path, the signal does not pass through the loop or there are errors in it. fault registration. If necessary, check the subsequent intermediate stations 10 at the end station I using the modulator 6 of the AC current, made, for example, in the form of a current generator connected in parallel to the AC circuit, a current pulse (the magnitude) is generated

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LI (in this case, part of the AC current is short-circuited through modulator 6). The amplitude of this pulse is chosen such that during its operation it releases the control relay 20 of the first PS. The modulation pulse is extracted in the first HC 10 by the current receiver D11 14 and switches the RS flip-flop in it. The low potential (logic O) from the RS-flip-flop output locks the transistor 16, thereby removing the shunt from the winding of the additional relay 21, the latter is triggered by breaking the control relay 20 and the digital signal in the first PS 10 by its disconnecting contact 22 The control relay 20 at the second intermediate station 10 operates, forming a train of DI and a digital signal on it. After checking the linear regenerators, a second pulse modulation of the AC current is sent to the second MS 10c of the terminal station 1. On the RS trigger of receiver 14 in the first PS 10, it does not have any effect by switching the trigger in receiver 14 of the second PS 10. Thus the interruption is terminated in the second PS 10 and organized in the third PS 10, and so on.

Let us now consider the operation of the circuit in the cable of all four wires, for example, between the first and second intermediate stations. In this case, the AC circuit is broken, and its source 7 at the terminal station 1 is automatically turned off (the requirement of safety at communications enterprises). If the cable at the end station is suspected, the polarity of the AC current is switched to reverse and the source 7 DC is turned on. In this case, the AC circuit at the first intermediate station 10 is closed through diode 13 and the control relay 20 is triggered. Then a modulation pulse is sent from the terminal station. At the same time, in the first PS 10, an additional relay 21 is disconnected, the relay 20 circuit opens, it releases, the loop circuit on the first PS 10 is broken. But since the first PS 10 cable is broken, the AC circuit is broken by the additional relay 21 in the first PS 10 Thus, the relay circuit 20 is restored, it is again triggered. The lack of advance of the loop through the line can be detected by the constant value of the voltage of the PD and the output of the source 7 DP of the terminal station 1 with several reversals

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kah its polarity. (In the absence of obryshov in the line, the voltage value of the DP will increase as the DP loops move along the path).

After the remote control of the linear regenerators in all PS 10 is completed, the DP source 7 at the terminal station 1 is turned off for a few seconds, all relays in all PS 10 are de-energized, and the circuits of the remote control devices for the linear regenerators return to their original state. After that, the DP source 7 is switched on in the working polarity, and the linear path can be put into operation.

Thus, the proposed device for remote monitoring of linear regenerators allows detection of virtually any damage in the linear path, including cable damage.

Claims (1)

Invention Formula A device for remote monitoring of linear regenerators, containing at the terminal station a serially connected digital transmission system transmitter and station winding of a matching transformer of the transmission path, a digital transmission system receiver connected in series with a fault recording unit and a station winding of a matching transformer of the receiving path, remote power source and remote power switch , the first and second outputs of which are connected to the middle points linear linear windings of matching transformers, respectively, of the transmitting and receiving paths, and at each intermediate station - serially connected regenerator. transmission path, switching unit and regenerator of the receiving path, a two-relay switch that includes a control and auxiliary relay, and the first diode, the cathode of which is connected via an open contact of the auxiliary relay to the remote supply input of the receive path regenerator, characterized by In order to improve the accuracy of control, the modulator of the remote power current, the inputs and outputs of which are connected to the 51141 responsibly with the outputs of the remote power source and with the inputs of the remote power switch, and at each intermediate station - a receiver of modulation pulses, a second and third diodes, a transistor and a bridge switch, the first and second switches of the first diagonal of the bridge rectifier are connected to the corresponding the outputs of the power source of the transmitting regenerators and the receiving paths, the output of the remote power supply of the regenerator of the receiving path is connected to the first output of the second diagonal of the bridge rectifier and to Tod second diode of which anode is connected to the input pulse receiver 56 modulation, the first and second outputs of which are connected respectively to the base and to the emitter of the transistor, the collector of which is connected to the first output winding of the auxiliary relay, to the remote power input of the receiving path regenerator and the third diode pins with the second winding of the additional relay, with the second winding of the second diagonal bridge rectifier and with the transistor emitter, and the first and second windings of the control winding the relays are connected respectively to the remote power output of the transmitting path regenerator and to the anode of the first diode.