JPH0541746A - Switching network connection method for telephone shape type remote monitor and control system - Google Patents

Abstract

(57) [Abstract] [Purpose] A conventional telephone sharing type remote monitoring and control device uses a dedicated telephone and uses only a telephone to make a voice call and make a call between dedicated lines. And the point that the connection between the switching network and the leased line could not be improved. A switching network interface circuit 4A is provided between the switching network 1 and the leased line 01, and a telephone interface circuit 9A is provided between the telephone 10 and the leased line 01. These two interface circuits 4A, 9A A telephone line connection signal is transmitted and received without passing through the remote monitoring and control device, and a telephone call by dial signal transmission between the telephones 10 and 11 is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for performing remote monitoring control by connecting a control station and a controlled station with a dedicated line. The present invention relates to a method for connecting the above-mentioned leased line and a telephone switching network in a supervisory control system. In the following figures, the same reference numerals indicate the same or corresponding parts.

[0002]

2. Description of the Related Art FIG. 5 shows an example of the configuration of a conventional telephone remote type remote monitoring control device. In the figure, reference numeral 2 denotes a control station side remote monitoring control device, which is connected to a dedicated line 01 through a high-pass filter 3 (abbreviated as HPF). Further, the telephone set 21 on the control station side is also connected to the dedicated line 01 through a low-pass filter 5 (also abbreviated as LPF). Reference numeral 7 is a remote monitoring control device on the controlled station side, and 22 is a telephone on the controlled station side, which are connected to a dedicated line 01 through a high-pass filter 6 and a low-pass filter 8, respectively. With such a configuration, the frequency band (0.3 to 3.
4 kHz) is divided into two, and the upper band side (2.0 to 3.4)
(kHz) is used for signals between the remote monitoring control devices 2 and 7, and the lower band side (0.3 to 1.8 kHz) is used for voice.

FIG. 6 shows a modification of the conventional remote monitoring control device for shared use of telephones. The high-pass filter 3 and the low-pass filter 5 shown in FIG. 5 are incorporated into the remote monitoring control device 2A on the control station side, and the high-pass filter 6 is used. , The low-pass filter 8 is incorporated in the remote monitoring control device 7A on the controlled station side.

[0004]

However, in the remote monitoring and control apparatus of FIGS. 5 and 6, the telephone sets 21 and 22 are directly connected to the private line 01 via the low-pass filters 5 and 8, respectively.
Therefore, it was a dedicated telephone different from a commercially available telephone, and the calling method used was voice calling. For this reason, the dedicated line used in the remote monitoring and control device could not be connected to the telephone switching network. SUMMARY OF THE INVENTION An object of the present invention is to provide a switching network connection method for a telephone shared remote monitoring control system, which enables connection between a leased line used in a remote monitoring control device and a switching network.

[0005]

In order to solve the above-mentioned problems, in the switching network connection method according to claim 1, a private line (01
, Etc., high-pass filters (3, 6, etc.) are connected in series at both ends, and low-pass filters (5, 8 etc.) are also connected in series at both ends of the dedicated line, respectively. 2 etc.) and the remote monitoring control device (7, etc.) on the controlled station side can communicate with each other via the two high-pass filters and the leased line, and can also make a telephone call via the two low-pass filters and the leased line. In the common telephone remote monitoring control system, the low-pass filter and the telephone switching network (1) corresponding to one of the two remote monitoring control devices (hereinafter referred to as switching network side control device).
A telephone network (PB type) that outputs a dial signal and the low-pass filter corresponding to the other of the two remote monitoring control devices (hereinafter referred to as the telephone side control device) by providing a switching network interface circuit (4 etc.) A telephone interface circuit (9, etc.) having a function of turning on / off the connection between the low-pass filter and the call circuit of the telephone, depending on whether the telephone is off-hook or on-hook. At the time of making a call from the switching network side, the switching network interface circuit inputs a call to the telephone from the switching network side, connects the communication path of the switching network to the corresponding low-pass filter, and also connects the switching network. The telephone side control device is caused to transmit this call through the telephone side control device, and the telephone interface circuit The ringing signal is given to the telephone based on the reception of the ringing, the on-hook of the telephone is detected to stop the ringing signal, the on-hook of the telephone is detected, and the exchange is performed via the telephone side control device. The network control device transmits this on-hook, and the switching network interface circuit turns off the connection between the switching network and the low-pass filter and informs the switching network of this on-hook based on the reception of this on-hook by the switching network side control device. Thus, at the time of making a call from the telephone, the telephone interface circuit responds to detection of off-hook of the telephone and on-hook subsequent to the off-hook to the switching network side control device via the telephone side control device. On-hook is transmitted, and the switching network interface circuit The off-hook of the network-side control device, based on the received on-hook,
The connection between the switching network and the low-pass filter is turned on and off respectively, and the switching network is notified of the off-hook and on-hook, respectively.

In the switching network connection method according to the second aspect, the high-pass filters (3, 3) are provided at both ends of the leased line (01, etc.).
6 and the like) are connected in series, and similarly low-pass filters (5, 8 and the like) are connected in series at both ends of the dedicated line,
The remote monitoring control device on the control station side (2 or the like) and the remote monitoring control device on the controlled station side (7 or the like) communicate with each other via the two high-pass filters and the dedicated line, and the two low-pass filters and the dedicated line. In the remote telephone remote control system that enables telephone calls via
A switching network interface circuit (4) is provided between the low-pass filter corresponding to one of the two remote monitoring control devices (hereinafter referred to as switching network side control device) and the telephone switching network (1 or the like).
A) is provided between the low-pass filter corresponding to the other of the two remote monitoring control devices (hereinafter referred to as the telephone-side control device) and the telephone (PB-type telephone 10, etc.) that outputs a dial signal. Is provided with a telephone interface circuit (9A or the like) having a function of turning on / off the connection between the low-pass filter and the call circuit of the telephone in accordance with the off-hook and the on-hook of the telephone. The switching network interface circuit inputs a call to the telephone from the switching network side, connects the communication path of the switching network to the corresponding low-pass filter, and transmits a signal indicating this calling to the telephone interface circuit. The telephone interface circuit provides a ringing signal to the telephone upon receipt of a signal indicating this call. Then, the off-hook of this telephone is detected to stop this ringing signal, then the on-hook of this telephone is detected and a signal indicating this on-hook is transmitted to the switching network interface circuit, and the switching network interface circuit detects this on-hook. The connection between the switching network and the low-pass filter is turned off based on the reception of the signal shown, and the switching network is notified of this on-hook. When a call is made from the telephone, the telephone interface circuit causes the telephone to go off-hook and the off-hook. In response to each detection of on-hook next to, the switching network interface circuit transmits signals indicating the off-hook and on-hook, and the switching network interface circuit receives the signals indicating off-hook and on-hook, respectively,
The connection between the switching network and the low-pass filter is turned on and off respectively, and the switching network is notified of the off-hook and on-hook, respectively.

[0007]

A switching network interface circuit for turning on / off the connection between the switching network and the low-pass filter is provided between the switching network and the low-pass filter corresponding to one of the remote monitoring control devices (control station side in this example). , Between the low-pass filter corresponding to the other remote monitoring control device (in this example, the controlled station side) and the telephone which outputs the dial signal, depending on whether the telephone is off-hook or on-hook. A telephone interface circuit for turning on / off the connection with the circuit is provided, and further, the above-mentioned 2
The two interface circuits perform the communication required for the telephone call through the corresponding remote monitoring and control device (Claim 1) or without (Claim 2), and make the telephone call between the switching network and the telephone. It is the one.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an embodiment of the invention according to claim 1 will be described with reference to FIGS. FIG. 1 is a block circuit diagram showing a configuration as an embodiment of the present invention, and corresponds to FIG. In FIG. 1, 1 is a telephone switching network (PBX),
4 is a switching network interface circuit provided on the control station side,
Reference numeral 9 is a telephone interface circuit provided on the controlled station side, and 10 and 11 are PBs for outputting commercially available dial signals.
A (push button) type telephone is shown. The telephone set 11 has a switching network 1, a switching network interface circuit 4, a low-pass filter 5
The telephone 10 is connected to the dedicated line 01 via the telephone interface circuit 9 and the low-pass filter 8.

FIG. 2 shows a call procedure from the switching network 1 in the configuration of FIG. 1, and FIG. 3 similarly shows a call procedure from the controlled station side telephone 10. 2 and 3 with reference to FIG.
Will be explained. First, referring to FIG. 2, by using any one of the telephones 11 connected to the switching network 1, the telephone 1 on the controlled station side is
When a push button operation (dial operation) for calling 0 is performed, this calling signal is given from the switching network 1 to the switching network interface circuit 4 as a reception notification. Therefore, the interface circuit 4 converts this reception notification into contact information and gives it to the control station side distant monitoring control device 2, and also connects the speech path of the switching network 1 to the dedicated line 01 via the low-pass filter 5. Therefore, the remote monitoring control device 2 transmits the reception notification from the interface circuit 4 to the remote monitoring control device 7 on the controlled station side through the dedicated line 01. Then, the control device 7 outputs this reception notification to the telephone interface circuit 9 as a calling signal, whereby the telephone interface circuit 9 outputs a ringing signal to the telephone 10 and rings the bell in the telephone 10. When the telephone 10 goes off-hook, the telephone interface circuit 9 connects the telephone circuit of the telephone 10 to the dedicated line 01 via the low-pass filter 8. This enables a telephone call between the telephone 10 and the switching network 1 side. Simultaneously with this off-hook, the telephone interface circuit 9 detects the off-hook of the telephone 10, stops the ringing signal, and stops the bell of the telephone 10.

When the telephone call is terminated in this way and the telephone 11 on the switched network side is on-hook, a busy tone (intermittent signal of 0.4 kHz) from the switched network 1 is given to the telephone 10 and the telephone call is terminated on the telephone 10 side. To know As a result, when the telephone 10 is on-hook, the telephone interface circuit 9 detects this on-hook, disconnects the call circuit between the telephone 10 and the low-pass filter 8, and uses this on-hook information as contact information to the remote side of the controlled station. Output to the monitor control device 7. Therefore, the control device 7 uses the leased line 0
This on-hook is transmitted to the remote monitoring control device 2 on the control station side through 1 and the control device 2 further notifies the switching network interface circuit 4 of this on-hook. Therefore, the interface circuit 4 disconnects the communication path of the exchange network 1 from the leased line 01 and outputs an on-hook signal to the exchange network 1. As a result, the busy tone from the switching network 1 becomes O.
FF. With this procedure, the call from the switching network 1 side ends.

Next, in FIG. 3, the off-hook signal from the telephone 10 is converted into contact information by the telephone interface circuit 9 in FIG. 1 and output to the distant monitoring control device 7 on the controlled station side. At this time, the telephone interface circuit 9 simultaneously connects the telephone communication circuit of the telephone 10 to the low-pass filter 8. Therefore, the control device 7 transmits this off-hook signal to the remote monitoring control device 2 on the control station side through the dedicated line 01. Therefore, the control device 2 outputs this transmission signal to the switching network interface circuit 4 as an off-hook signal, and the interface circuit 4 outputs this reception signal to the switching network 1 as an off-hook signal and at the same time, the communication path of the switching network 1 and the dedicated line 01. Therefore, the telephone 10 is connected. As a result, a dial tone (continuous signal of 0.4 kHz) is output from the switching network 1 to the telephone 10. Next, a ringback tone (continuous signal of 0.4 kHz) is output from the switching network 1 by dialing by a push button operation or the like from the telephone 10, and the ringback tone is turned off when the connection with the other party is confirmed. You can talk.

At the end of the call, the telephone interface circuit 9 detects the on-hook of the telephone 10 and outputs it as contact information to the remote monitoring control device 7 on the controlled station side. At this time, the telephone interface circuit 9 simultaneously disconnects the telephone circuit between the telephone 10 and the low-pass filter 8. Then, the control device 7 transmits this on-hook to the control station side remote monitoring control device 2 through the leased line 01, and the control device 2 outputs this transmission signal to the switching network interface circuit 4 as on-hook. Therefore, the interface circuit 4 outputs the received signal to the switching network 1 as an on-hook signal and disconnects the communication path of the switching network 1 from the dedicated line 01, thereby completing a series of communication.

FIG. 4 is a modification of FIG. 1, in which the high pass filter 3 and the low pass filter 5 shown in FIG.
The low-pass filter 8 is incorporated in the telephone interface circuit 9. Further, the filters 3 and 5 may be incorporated into the remote monitoring control device 2 on the control station side, and the filters 6 and 8 may be incorporated into the remote monitoring control device 7 on the controlled station side.

Next, an embodiment of the invention according to claim 2 will be described with reference to FIGS. FIG. 7 is a block diagram showing the configuration as an embodiment of the present invention. In FIG. 7, the switching network interface circuit is replaced with 4A and the telephone interface circuit is replaced with 9A, as compared with FIG. Then, the two interface circuits 4A and 9A send and receive signals necessary for a call between the telephone 10 and the exchange network 1 side without passing through the remote monitoring control devices 2 and 7, and connect the telephone line between the telephone 10 and the exchange network 1. To do.

FIG. 8 shows a call procedure from the switching network 1 in the configuration of FIG. 7, and FIG. 9 shows a call procedure from the controlled station side telephone 10. Next, FIGS. 8 and 9 will be described with reference to FIG. In FIG. 8, a switching network interface circuit 4A
Receives the received signal from the switching network 1, connects the speech path of the switching network 1 to the dedicated line 01 through the low-pass filter 5, and sends the received signal to the voice band (0.3 to 3.4k).
(Hz) low frequency side (0.3 to 1.7 kHz) is converted to a predetermined frequency and transmitted to the controlled station side. The telephone interface circuit 9A detects the signal, outputs a ringing signal to the telephone 10, and rings the bell of the telephone 10. Further, the telephone interface circuit 9A detects the off-hook of the telephone 10, connects the telephone communication circuit of the telephone 10 to the leased line 01 through the low-pass filter 8, stops the ringing signal, and stops the bell of the telephone 10.

At the end of the call, a busy tone (intermittent signal of 0.4 kHz) is transmitted from the switching network 1. When the telephone 10 is on-hook by this, the telephone interface circuit 9A detects this on-hook and the telephone is turned on. 1
The communication circuit between 0 and the low-pass filter 8 is disconnected, and this on-hook is converted into a predetermined frequency on the low frequency side and transmitted to the control station side. As a result, the switching network interface circuit 4A detects the signal, disconnects the connection between the switching network 1 and the leased line 01, and outputs an on-hook signal to the switching network 1 to turn off the busy tone. The call from the switching network is completed by the above procedure.

In FIG. 9, when the telephone interface circuit 9A receives an off-hook signal from the telephone 10, the telephone circuit of the telephone 10 is connected to the low-pass filter 8 and the off-hook signal is fed to a predetermined frequency on the low frequency side. Converted to and transmitted to the control station side. The switching network interface circuit 4A detects the signal, outputs it as an off-hook signal to the switching network 1, and connects the communication path between the private line 01 and the switching network 1. As a result, a dial tone (continuous signal of 0.4 kHz) is output from the switching network 1, and then a ring back tone (0.4 kHz) is transmitted from the switching network 1 by dialing by a push button operation from the telephone 10.
(Intermittent signal of Hz) is output, the ringback tone is turned off when the connection with the other party is confirmed, and the call becomes possible.

At the end of the call, the telephone interface circuit 9A detects the on-hook of the telephone 10, disconnects the call circuit between the telephone 10 and the low-pass filter 8, and converts this on-hook to a predetermined frequency on the low frequency side. Send to the control station side. The switching network interface circuit 4A detects the signal, disconnects the communication path between the switching network 1 and the dedicated line 01, and outputs the signal to the switching network 1 as an on-hook signal, thereby ending a series of communication.

FIG. 10 shows a modified example of FIG.
The high-pass filter 3 and the low-pass filter 5 are incorporated in the switching network interface circuit 4A, and the high-pass filter 6 and the low-pass filter 8 are incorporated in the telephone interface circuit 9A. In addition, filters 3, 5,
Nos. 6 and 8 may be omitted by using the filters on the remote monitoring and control device side.

[0020]

A system for performing a distant monitoring control device by connecting a distant monitoring control device on the control station side and a distant monitoring control device on the controlled station side by a dedicated line, and this dedicated line is also used for telephone calls. In the telephony shared remote monitoring control system, interface circuits are provided between the switching network on the control station side and the leased line, and between the telephone on the controlled station side and the leased line to connect the telephone and the switching network. Since the two interface circuits transmit and receive the line connection signal for a call through the remote monitoring control device (Claim 1) or without (Claim 2), the remote monitoring control device is used. It is possible to connect the dedicated line and the switching network.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a configuration as an embodiment according to claim 1.

FIG. 2 is a diagram showing a call procedure from the switching network side in FIG.

FIG. 3 is a diagram showing a call procedure from the controlled station side telephone in FIG.

FIG. 4 is a diagram showing a modified example of FIG.

FIG. 5 is a conventional block circuit diagram corresponding to FIG.

FIG. 6 is a modified circuit diagram of FIG.

FIG. 7 is a block circuit diagram showing a configuration as an embodiment of the invention according to claim 2;

FIG. 8 is a diagram showing a call procedure from the switching network side in FIG.

FIG. 9 is a diagram showing a call procedure from the controlled station side telephone in FIG.

FIG. 10 is a diagram showing a modified example of FIG.

[Explanation of symbols]

 01 leased line 1 switching network 2 remote monitoring control device on control station side 3 high pass filter (HPF) 4 switching network interface circuit 4A switching network interface circuit 5 low pass filter (LPF) 6 high pass filter (HPF) 7 controlled station remote monitoring control Device 8 Low-pass filter (LPF) 9 Telephone interface circuit 9A Telephone interface circuit 10 PB type telephone 11 PB type telephone

Claims (2)

[Claims] 1. A high-pass filter is connected in series to both ends of a leased line, and a low-pass filter is connected in series to both ends of the leased line, respectively. A remote shared telemonitoring control system for communicating with a device via the two high-pass filters and a leased line, and enabling telephone communication via the two low-pass filters and a leased line, wherein the two remote units are provided. A switching network interface circuit is provided between the low-pass filter corresponding to one of the supervisory control devices (hereinafter referred to as the switching network side control device) and the telephone switching network, and the other of the two remote monitoring control devices (hereinafter referred to as the telephone side control device). Between the low-pass filter corresponding to the above) and the telephone that outputs the dial signal. A telephone interface circuit having a function of turning on / off the connection between the low-pass filter and the telephone communication circuit according to the switching network is provided, and when a call is made from the switching network side, the switching network interface circuit is While inputting a call to the telephone from the switching network side and connecting the communication path of the switching network to the corresponding low-pass filter, the telephone network control device is caused to transmit the call via the switching network control device. The telephone interface circuit provides a ringing signal to the telephone on the basis of the reception of the call by the telephone side control device, then detects an off-hook of this telephone and stops this ringing signal, and then an on-hook of this telephone. It is detected, and this on-hook is transmitted to the switching network side control device via the telephone side control device, The face circuit turns off the connection between the switching network and the low-pass filter based on the reception of this on-hook by the switching network side control device and notifies the switching network of this on-hook. The telephone interface circuit causes the switching network side control device to transmit the off-hook and the on-hook via the telephone side control device in response to detection of off-hook of the telephone and on-hook subsequent to the off-hook, respectively. On the basis of the reception of the off-hook and on-hook by the switching network side control device, the connection between the switching network and the low-pass filter is turned on and off respectively, and the switching network is notified of the off-hook and on-hook, respectively. Communication of remote telephone remote control system Network connection method. 2. A high-pass filter is connected in series to both ends of the leased line, and a low-pass filter is connected in series to both ends of the leased line, respectively. A remote shared telemonitoring control system for communicating with a device via the two high-pass filters and a leased line, and enabling telephone communication via the two low-pass filters and a leased line, wherein the two remote units are provided. A switching network interface circuit is provided between the low-pass filter corresponding to one of the supervisory control devices (hereinafter referred to as the switching network side control device) and the telephone switching network, and the other of the two remote monitoring control devices (hereinafter referred to as the telephone side control device). Between the low-pass filter corresponding to the above) and the telephone that outputs the dial signal. A telephone interface circuit having a function of turning on / off the connection between the low-pass filter and the telephone communication circuit according to the switching network is provided, and when a call is made from the switching network side, the switching network interface circuit is A call from the switching network side to the telephone is input, the communication path of the switching network is connected to the corresponding low-pass filter, and a signal indicating this calling is transmitted to the telephone interface circuit. A ringing signal is provided to the telephone upon receipt of a signal indicating a call, then the off-hook of this telephone is detected and this ringing signal is stopped, and then the on-hook of this telephone is detected and this switching network interface circuit detects this. A signal indicating on-hook is transmitted, and the switching network interface circuit indicates this on-hook. The connection between the switching network and the low-pass filter is turned off on the basis of the reception of the signal, and the switching network is notified of this on-hook. In response to each detection of on-hook next to off-hook, a signal indicating the off-hook and the on-hook is transmitted to the switching network interface circuit, and the switching network interface circuit receives the signals indicating the off-hook and the on-hook, respectively, and A method for connecting a switching network to a telephone-type remote monitoring and controlling system, characterized in that the connection between a switching network and a low-pass filter is turned on and off respectively, and the off-network and on-hook are respectively notified to the switching network.