JPH02108330A - Transmission path restoration remote controller - Google Patents

Abstract

PURPOSE:To remote-control the restoration of a transmission path by providing a circuit to oscillate sine waves by the number of switches and a circuit to mix and send the waves on a transmission means, and providing a sine wave extracting circuit and a switch control circuit on a receiving means. CONSTITUTION:A transmission path change-over switch SW 103 of a C station is controlled by a B station. At such a time, a transmission path restoration remote controller 70, a reception part 73 of the controller, an information line 72 between a transmission part 70 and the reception part 73 are newly provided. In the transmission part 70, a sine wave oscillating circuit, which has (n) frequen cies when the (n) pieces of transmission paths exist, in the reception part 73, the signals are received from the information line 72, the sine wave signals at the respective frequencies are extracted, and only when the frequencies corre spond to the signal frequencies of the change-over switch 103, a built-in restoring switch of the switch 103 is automatically operated. The same reception part is provided on an A station. In such a constitution, the restoration of the trans mission path switched from a current use to an auxiliary use can be remote- controlled.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is applicable to a transmission system equipped with two transmission lines, a working transmission line and a backup transmission line. The present invention relates to a transmission line remote switch-back control device for switching back from a standby to a working transmission line by remote control when the working transmission line recovers from a failure.

[Conventional technology]

Traditionally, in transmission systems that have two transmission lines, one for working and one for backup, the working transmission line is usually used to transmit information, and when the working transmission line fails, the working transmission line is automatically switched to the working transmission line. By switching from the backup transmission line to the backup transmission line, information is transmitted using the backup transmission line, during which time the failure of the current transmission line is repaired and recovered, and when the repair is completed, the backup is manually switched from the backup transmission line to the active transmission line. I was switching.

The second @ is a block diagram of a conventional transmission line switching system.

In FIG. 2, a case is shown in which a working transmission line is connected between station A and 6 stations, and a protection transmission line is connected via 8 stations.

In Fig. 2, 101 to 103 are transmission line changeover switches built in stations A, B, and C, 201 is a working transmission line connected to changeover switch 101 of station A and changeover switch 103 of 6 stations, and 211 is a transmission line changeover switch built in stations A, B, and C. A station changeover switch 1
01 and the backup transmission line connected to the changeover switch 102 of the B station, 212 is the changeover switch 102 and 6 of the B station
A backup transmission line 50 connected to the changeover switch 103 of each station; 50 a control device that collects information from the changeover switch of each station and controls each switch based on the information; 31;
Information lines 1 to 313 transmit control information between the changeover switches 101 to 103 of each station and the control device 50.

When a fault occurs in the working transmission line 201 and the six changeover switches 103 detect this fault, the changeover switch 103 controls a fault detection signal to notify that a fault has been detected via the information line 313. Transfer to device 50. Upon receiving the fault detection signal, the control device 50 transfers the switching signal to the switching switches 101 to 103 of each station via the information lines 311 to 313. Each station A,
B.

When the C changeover switches 101 to 103 receive the changeover signal, they switch from the working transmission line 201 to the protection transmission lines 211 and 212 based on the changeover signal. In this way, if the working transmission line becomes a failure.

Control equipment! The current use is automatically switched to the standby use by an instruction from 150.

Next, when the fault in the working transmission line is recovered, the operator can use the backup switch to the current transmission line.

In other words, the changeover switches 10 of the six stations where the failure was detected
By manually operating the cut-back switch provided at 3, a cut-back request signal is transferred to the control device 50 via the information line 313. When the control device 50 receives the cutback request signal, it transfers the cutback signal to the changeover switches 101 to 103 of each station A, B, and C via the information lines 311 to 313. As a result, the changeover switches 101 to 103 of each station switch back the transmission line from the protection transmission line 211, 212 to the working transmission line 201 based on the switch-back signal.

Regarding conventional transmission line switching control devices for active and backup use, see 1, for example, "Electronic Information and Communication Handbook (Second Edition)".
2421-2423, published by the Institute of Electronics, Information and Communication Engineers, March 30, 1988.

[Problem to be solved by the invention]

In this way, with conventional transmission line changeover switches, when switching back from standby to working, it is necessary to manually operate the cutback switch provided on the changeover switch of the station where a fault in the working transmission line has been detected. An operator must be present at the station for cutback. Since the operator needs to move to each station A, B, and C for maintenance, there is a problem in that maintainability deteriorates if the operator is stuck at the station where the fault has been detected until recovery.

An object of the present invention is to solve such conventional problems, and to make it possible to switch back the transmission line by remote control when switching back from a backup transmission line to a working transmission line from which a fault has been recovered, and to provide a method other than switching back. The object of the present invention is to provide a transmission line remote switch-back control device that can remotely control all of the switches.

[Means to solve the problem]

In order to achieve the above object, a transmission line remote switch-back control device of the present invention remotely switches back a plurality of transmission lines that have been switched from active to backup using a transmission line changeover switch. , a plurality of sine wave oscillation circuits each having a number of frequencies corresponding to a plurality of cut-back switches included in the transmission line changeover switch, and a sine wave signal oscillated by the plurality of sine wave oscillation circuits are mixed. and a circuit for receiving the signal from the information line and extracting a sine wave signal of each frequency.

The present invention is characterized in that it includes a receiving means comprising a circuit that controls a cut-back switch corresponding to each transmission path when the extracted signal matches a predetermined signal frequency corresponding to each transmission path.

[For production]

In the present invention, a transmitting device is provided in a station where a user exists, for example, a station that switches between protection transmission lines, and a receiving device is provided in a station that switches between working and protection transmission lines, and a sine wave of a frequency corresponding to a cutback switch is transmitted from the transmitting device. By transmitting a signal and receiving it with a receiving device, the cut-back switch is automatically operated only when the extracted signal matches a predetermined signal frequency. This makes it possible to switch back the transmission line by remote control.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to one drawing.

FIG. 1 is a block diagram of a transmission line switching system showing one embodiment of the present invention.

In FIG. 1, the same symbols as in FIG. 2 indicate the same circuits and components.

In this example, switch-back control of the transmission path changeover switch 103 of the 0th station is performed from the B station. That is, 70 is a transmitter of the transmission line remote switchback control device newly provided in the present invention, 73 is a receiver of the transmission line remote switchback control device newly provided in the present invention, and 72 is the transmitter 70 and This is an information line that connects to the receiving section 73.

The transmitting section 70 includes a plurality of sine wave transmitting circuits each having the same number of frequencies as the cut-back switches (for example, n when the number of transmission lines is n), and the receiving section 73 includes receives the signal from the information line 72, extracts a sine wave signal of each frequency, and only when the extracted signal matches a predetermined signal frequency, that is, matches the signal frequency corresponding to the switch 103. switch 103 only when
It automatically operates the cut-back switch installed in the

Although not shown in the figure, the A station is also provided with a receiving section.

FIG. 3 is a detailed block diagram of a transmission line remote switchback control device showing one embodiment of the present invention.

In FIG. 3, the transmitter 70 is on the left side of the broken line, and the receiver 73 is on the right side. Note that the upper portions of the transmitter 70 and the receiver 73 are transmission and reception circuits for the cutback signal, and the lower portion is a transmission and reception circuit for lighting monitor lamps for monitoring the information line and for monitoring the cutback control signal. There is.

701 of the transmission section of the B station is a selection switch for selecting a switch for switching back of the partner station 0, and 702 is a sine wave oscillation section that oscillates a frequency corresponding to the switch for switching back to be controlled. , this sine wave oscillation section 702 is composed of an oscillator 7021, a bandpass filter 7022, and an attenuator 7023. 703 is each sine wave oscillation unit 7
Mixer 70 for mixing the sine wave signals from 02
4 and 705 are transformers for impedance matching with the transmission line, 72 is a transmission line for sine wave signal transmission, 706 is an amplifier, 707 is a band pass filter that selects a control frequency, and 708 is a comparison unit for the selected frequency. It is composed of a rectifier 7081 and a comparator 7082. 709
is a low-pass filter for selecting the information line monitoring signal, 710
is the frequency comparison section, which includes a rectifier 7101 and a comparator 71
02. Reference numerals 711 and 712 are lamps for monitoring control signals, and LEDs or the like are used. Further, 713 is an oscillator that oscillates an information line monitoring signal,
This signal is monitored by pilot lamp 738 on the receiving side and pilot lamp 712 on the transmitting side. 71
1 is a monitor lamp for confirming that the switchback control signal has been transferred to the receiving side.

On the other hand, 731 and 740 of the receiving section 73 of the C station are transformers for impedance matching, 732 is an amplifier, 733 is a band pass filter that selects a frequency for control, 734 is a comparison section for the selected frequency, and a rectifier 7341 and a comparator 7342. Reference numeral 735 is a drive circuit that controls the return switch of the transmission path changeover switch 103, and uses a relay, for example. 739 is a mixer; 736 is a low-pass filter for selecting the information line monitoring signal; and 737 is a frequency comparator, which is composed of a rectifier 7371 and a comparator 7372. 738 is a monitor lamp for monitoring the information line, and an LED or the like is used.

In FIG. 3, in order to cut back a transmission line, first, in the transmitter 70, a selection switch (preset switch) 701 corresponding to the transmission line to be cut back is selected and turned on. Here, since there are five transmission paths, the switch 701 corresponding to the corresponding transmission path among them
operate. As a result, a sine wave having a certain frequency or less is sent out from the sine wave oscillation unit 702.

FIG. 4 is a detailed configuration diagram of the sine wave oscillation section in FIG. 3.

In FIG. 4, when a selection switch (preset switch) is turned on, the corresponding oscillator 7021 oscillates, and by setting the variable resistance in the 6 feedback circuits that generate pulses at that frequency to a certain value, a predetermined value is generated. oscillates at the oscillation frequency. For example, when a telephone line is used as the information line 72, the frequency is preferably about 500 Hz to 2500 Hz. The pulse signal generated by the oscillator 7o21 is converted into a sine wave by the bandpass filter 7022, and then converted to a constant level by the attenuator 7o23 at the next stage. The circuit 7023 is composed of an operational amplifier, a resistor, and a capacitor, and is used as a bandpass filter and at the same time as an attenuator. circuit 7o22
is added to the bandpass filter with a variable attenuator, capacitor, and resistor.

As shown in FIG. 3, a sine wave of a predetermined frequency is converted to a constant level by an attenuator 7023, and then a mixer 703 mixes the output signals from each bandpass filter 7023, and a transformer 704 transforms the impedance of the transmission line 72. converted to .

The information is sent to the information line 72. For example, a telephone line is used as the information line 72, but it goes without saying that a dedicated line may also be used.

On the receiving side, the signal from the information line 72 is inputted to an amplifier 732 via an impedance conversion transformer 731, amplified to a specified level by the amplifier 732, and then inputted to a bandpass filter 733. Extract the frequency signal.

FIG. 5 is a detailed configuration diagram of the receiving side bandpass filter in FIG. 3.

As shown in FIG. 5, the bandpass filter 733 is configured by connecting two stages of operational amplifier, resistor, and capacitor circuits in series. The signal extracted by the bandpass filter 733 is converted to direct current by a rectifier 7341, and then compared with a predetermined voltage by a comparator 7342. When the signal is higher than that voltage, a switch controller 735 (relay) is activated. make it work.

FIG. 6 is a detailed configuration diagram of the rectifier, comparator, and switch controller in FIG. 3.

The circuit 7341 includes an amplifier circuit using an operational amplifier and a rectifier using a diode, and the next circuit 7342 uses an operational amplifier to configure a comparator with a specified voltage.

A Zener diode generates a specified voltage, and the difference between that voltage and the input voltage is input to the (+) and (-) terminals of the operational amplifier, and the difference is output. The relay circuit 735 at the next stage operates the relay RLI and turns on the contact rll, thereby sending earth air to the cut-back switch in the transmission line changeover switch and turning on the switch.

In the transmission line changeover switch 103 in FIG. 3, the relay sends air to the cutback switch in the transmission line changeover switch, and thereby the cutback switch request signal is transmitted to the control device 50 via the information line 313. As a result, the transmission path is cut back.

Next, the information monitoring signal sent out from the oscillator 713 on the transmitter 70 side is extracted by a bandpass filter 736 for information line monitoring signals on the receiver 73 side, and is passed through a rectifier 7371 and a comparator 7372 to a predetermined value. The voltage is compared to the specified voltage. When the received voltage is higher than the specified voltage, that is, when an information monitoring signal is detected, a monitor lamp 738 for monitoring the information line is turned on. When the LED light is green, it indicates that the pilot is normal.

The information line monitoring signal uses a frequency different from the signal frequency for controlling the reversing switch. For example, when the signal for controlling the reversing switch is 500 Hz to 2,500 Hz, a frequency of about 3,200 Hz is used.

The signal extracted by the band pass filter 736 is mixed with the signal extracted by each band pass filter 733 in a mixer 739, and the impedance conversion transformer 740
The data is sent back to the transmitter 70 via the information line 72.

In the transmitting section 70, this returned signal is received by an impedance conversion transformer 705 and an amplifier 706, and the cutback signal is extracted by a bandpass filter 707, and then passed through a rectifier 7081 and a comparator 7082 to obtain a predetermined signal. When compared with the voltage and is greater than this specified voltage,
That is, when the switchback control signal is received, the control signal monitor lamp 711 is turned on. Thereby, it can be confirmed that the switchback control signal has been transferred to the receiving section 73 side.

On the other hand, the information line monitoring signal is processed by a low-pass filter 709.
After being extracted, it is compared with a predetermined voltage via a rectifier 7101 and a comparator 7102, and if the voltage is higher than that voltage, the information line monitoring signal 712 is turned on. Thereby, disconnection of the information line 72 can be monitored.

FIG. 7 is an external view of a device according to the present invention.

(a) and (b) are respectively a front view and a rear view of the transmitting section, and (c) and (d) are respectively a front view and a rear view of the receiving section.

In (a), preset switches (control switches) are arranged in the center, and operation lamps for the control switches are arranged below them. Also,
Pilot lamps are provided at both ends for monitoring the information line and for monitoring the switchback control signal.

In (b), an input/output terminal, a fuse terminal, and a power supply terminal are provided.

In (c), pilot lamps are provided at both ends and a power lamp is provided below.

In (d), input/output terminals and control line terminals are arranged on the terminal board, and fuse and power supply terminals are provided above and below the right end.

The transmitting section is provided in a manned station, and the receiving section is provided in an unmanned station provided with a remote cut-back switch. When the faulty working transmission path is restored, the transmission section is activated by the staff member, and a sine wave signal of a frequency corresponding to the restored transmission path is transmitted to the reception section via the information line.

〔Effect of the invention〕

As explained above, according to the present invention, the transmitting section sends out a sine wave signal of a frequency corresponding to the cut-back switch, and the receiving section detects that the extracted signal matches a predetermined signal frequency. This automatically operates the cut-back switch, making it possible to switch back the transmission line by remote control.

Furthermore, it can be used for remote control of turning on and off switches in addition to switching back transmission lines.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a transmission line switching system showing an embodiment of the present invention, FIG. 2 is a configuration diagram of a conventional transmission line switching system, and FIG. 3 is a detailed configuration of the transmitter and receiver in FIG. 1. 4 is a diagram showing a circuit example of the sine wave oscillation section in FIG. 3, FIG. 5 is a diagram showing a circuit example of the bandpass filter in FIG. 3, and FIG. 6 is a diagram showing a circuit example of the frequency comparison section in FIG. 3. , a diagram showing an example of a circuit of a cut-back switch controller, and FIG. 7 are external views of a transmitting section and a receiving section of the present invention. 50: control device, 70: transmitter, 72: information line. 73: Receiving unit, 201: Working transmission line, 211, 212:
Protection transmission line, 101, 102, 103: Transmission line changeover switch, 311, 312, 313: Signal line for switching control signal, switchback request signal, 701: Control switch (preset switch), 702: Sine wave oscillation unit, 703,739: mixer, 704,705,7
31,740: Transformer, 706,732: Amplifier, 71
3: Information line monitoring oscillator, 733, 736, 707: Band pass filter, 735: Relay, 738, 711° 712 = Control signal monitoring lamp, 709: Low pass filter, 734, 708, 710: Frequency comparison unit. Agent Patent Attorney Masaru Isomura 1′! Shun rho

Claims (1)

[Claims] (1) In a transmission line remote switch-back control device that remotely switches back a plurality of transmission lines that have been switched from active to backup by a transmission line switch, the transmission line switch includes a plurality of switch-back switches. a transmitting means comprising a plurality of sine wave oscillation circuits, each having a number of frequencies corresponding to the number of sine wave oscillation circuits, and a circuit for mixing the sine wave signals oscillated by the plurality of sine wave oscillation circuits and sending the mixture to an information line; A circuit that receives a signal from an information line and extracts a sine wave signal of each frequency; 1. A transmission line remote switch-back control device, comprising a receiving means comprising a circuit for controlling a corresponding switch-back switch.