JPS6322494B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a terminal station emergency interrupt communication system suitable for a disaster prevention administrative radio system.

For example, as shown in FIG. 1, the disaster prevention administrative radio system includes a control station 1, a branch station 3 connected to the control station 1 via a multiplex radio line 2, and a branch station 3 connected to the branch station 3 via a single radio line 4. A relay station 100 is provided when there is no line-of-sight between the control station 1 and the control station 1. Control station 1 and branch station 3 are equipped with switching machines.
Communication is possible between the wired terminal in the control station 1, the wired terminal in the branch station 3, and the terminal station through exchange connections.

In such a system, suppose that while a certain terminal station 5 is communicating with an arbitrary terminal via the single radio line 4 and the exchange of the branch station 3, another terminal station affiliated with the branch station 3 interrupts. The interruption is made when it is necessary to perform emergency communication with the control console of the control station 1. Conventionally, this interrupt was handled as follows. That is, the switching equipment at the branch station 3 emits a disconnect warning sound and then forcibly disconnects the line that is currently communicating. Thereafter, a dial signal corresponding to the control console is sent to the switchboard of the control station 1, and a connection is attempted. Although a plurality of lines are normally assigned to the control console of the control station 1, there is not necessarily a vacancy. In this case, one method is to wait until the line becomes free, and the other is to forcibly disconnect a predetermined specific line even if it is in use, as this cannot serve as an emergency interrupt. There is also one that connects a terminal station with a large number of terminals. However, in any case, such conventional interrupt communication methods are not satisfactory in terms of immediacy, and the burden on the switching system is large. In particular, the former does not necessarily allow for emergency interrupt communication, and the latter This type of disaster prevention administrative radio system has various inconveniences, such as having to interrupt communications with the control console of the control station 1, which is particularly important.

An object of the present invention is to provide an emergency interrupt communication method that can eliminate these inconveniences with a simple configuration.

The present invention breaks away from the fixed idea that it is based on line switching, and instead uses the control console of the control station and the branch station, such as a meeting line that is always provided in multiplex radio lines or a dedicated line for mobile stations that is normally provided in disaster prevention administrative radio systems. The above objective is achieved by connecting the interrupted terminal station to a line that is directly connected to the line without going through an exchange.

Hereinafter, the present invention will be explained in detail based on examples of the present invention. FIGS. 2 and 3 are configuration diagrams of a control station and a branch office, respectively, in an embodiment in which a meeting line is used. In Figure 2, 6 is the PBX in the prefectural office building, 7 is the PBX's extension phone, 8 is the exchange installed for the disaster prevention administrative radio system, 9 is the dedicated telephone installed in the governor's office, for example, and 10 is as needed. 11 is a control board that controls mobile stations to be described later; 12 is a carrier end station device; 13 is a multiplex radio; 14 is an aerial line. Furthermore, 15 is a remote monitoring and control device, FSK
It has a modem 151 and is connected to the meeting line terminal OW of the multiplex radio 13 via a signal line 21, and connected to a control console via a communication signal line 22, an interrupt information line, an interrupt communication recovery information line 24, and a monitoring information line 25. 10. 152 is an FSK signal line.

In FIG. 3, 31 is an antenna opposite to one of the antennas 14 of the control station (FIG. 2), 32 is a multiplex radio, 33 is a carrier end station device, 34 is a switch, and 35
36 is a dedicated telephone; 36 is a control unit that controls the exchange 34 to control incoming and outgoing calls as well as issuing simultaneous commands to terminal stations under its control; 37 is a control unit that controls mobile stations, which will be described later; 38 teeth
VHF radio, 39 is an antenna. 40 is a signal conversion device originally provided for the interface between the exchange 34 and the VHF radio 38, such as converting dial signals, but it also includes an interrupt detection circuit 401 for detecting an interrupt, and an interrupt detection circuit 401 of the present invention. A switch 402 is provided for this purpose. 41 is a remote monitoring and control device of a branch station corresponding to that on the control station side;
It has an FSK modem 411 and is connected to the meeting line terminal OW of the multiplex radio 32 through a signal line 51, and connected to the signal converter 40 through a call signal line 52, an interrupt information line 53, and an interrupt communication recovery information line 54. It is further connected to the control console 36 by a call signal line 55. 56 is an input terminal for monitoring information, and 412 is an FSK signal line.

The meeting line usually has a voice communication band of 0.3kHz~
It has 3.4kHz and is originally used when installing or adjusting multiplex radios, but since it can be used at all times when multiplex radios are operating, it can be used between the control station and each branch station. It is also used for remote monitoring and control. The monitoring information is, for example, information representing the operating status of equipment, the status of commercial power supply, and the like. The modem 411 collectively encodes the input monitoring information and other information, and then encodes the input monitoring information and other information.
It is modulated by FSK and sent to the FSK signal line 412. The FSK signal is a signal that falls within a voice communication band, for example, a high and narrow band. This signal is combined with the signal on the call signal line 52 or 55,
The signal enters the signal line 51 and appears on the signal line 21 of the multiplex radio device 13 of the control station through the multiplex radio line. Among them, the FSK signal is branched to the FSK signal line 152 side and enters the FSK modulator/demodulator 151 . The FSK modulator/demodulator 151 demodulates this and outputs it to the corresponding information line for each information.

Now, as mentioned above, the wired terminal in the control station, that is, the PBX extension telephone 7, dedicated telephone 9, and control console 10 through the PBX, the wired terminal in the branch office, that is, the dedicated telephone 35 and the control console 36, and the terminal station can be Communication is possible between two parties through an exchange connection using an exchange. Now, suppose that while a terminal station affiliated with a certain branch station is talking to the dedicated telephone 35 via the exchange of the branch station, another terminal station issues an emergency interruption. Then, this emergency interrupt is sent to the signal converter 4.
0 is detected by the interrupt detection circuit 401. Various methods for issuing and detecting interrupts are known, but for example, a terminal station that issues an interrupt may send out a specific control tone, and the interrupt detection circuit 401 detects this control tone. With this alone, if the terminal station that interrupts is farther away from the branch station than the terminal station that is communicating, the terminal station's signal cannot necessarily be demodulated by the VHF radio, so normal calls cannot be carried out. A method is also known in which the transmission of radio waves from a terminal station is interrupted for a minute period at a predetermined period.

When the interrupt detection circuit 401 detects an interrupt,
A significant signal is output to the interrupt information line 53. This signal is transmitted to the FSK modem 4 of the remote monitoring and control device 41.
11 and becomes a control signal for the switch 402. As a result, the contact of the switch 402 is switched from the exchange side to the call signal line 52 side. on the other hand,
The FSK modulator/demodulator 411 encodes the input interrupt information, modulates it using FSK, and transmits it to the control station. The interrupt information obtained by demodulation by the FSK modem 151 of the remote monitoring and control device 15 of the control station is
The signal is transmitted to the control console via the interrupt information line 23 and drives an alarm sound generator (not shown). In response to this, when a handset (not shown) connected to the call signal line 22 is raised to respond, the generation of the alarm sound is stopped. As mentioned above, since the signal line on the VHF radio side and the call signal line 52 have already been connected in the signal converter 40 of the branch station, the control stand of the control station and the terminal station that made the interruption can be connected to each other. The two are connected by a meeting line and telephone calls are possible. Restoration after the end of a call may be controlled by a timer in the interrupt detection circuit 401, but in this embodiment, interrupt communication restoration information can be transmitted from the control station control console. Here, communication between the remote monitoring and control device and the control station is performed.
Since the FSK signals are sent and received by each branch station on a time-sharing basis, interrupt information is not literally transmitted to the control console immediately, but it is transmitted within an extremely small amount of time, so immediacy is not compromised.

Note that it is not always necessary to transmit the interrupt information by FSK signals; it is possible to call by straight voice, or by installing a tone signal generation source in the signal converter and connecting it to the call signal line for a limited time to transmit the interrupt information to the control station control console. Sound may be emitted from a speaker, but if the interrupt information is transmitted using the function of the remote monitoring and control device, it has the advantage of being able to notify which branch station system the emergency communication is coming from. be.

Corresponding to FIGS. 2 and 3, FIGS. 4 and 5, in which the same parts are denoted by the same reference numerals, are block diagrams of an embodiment in which a dedicated line for mobile stations is used. To explain mobile stations here, mobile stations are used to obtain information with mobility, and VHF radios installed at relay stations or some branch stations are used as base station radios to transmit information throughout the prefecture. is movable. In this case, zone switching is involved, and line conversion would complicate the system, so specific channels of multiple radio lines are fixedly assigned.

In FIG. 4, the movable control table 11 and the transport end 12 are directly connected by a signal line 27 without using a switch 8. In FIG. Further, in FIG. 5, the moving control table 37 and the transport end 33 are directly connected by a signal line 59. Reference numeral 60 represents a VHF radio corresponding to the above-mentioned base station radio, and although it is not always provided, the mobile control stand 37 is normally provided so as to be able to communicate with mobile stations. A signal line 52 connected to the switch 402 is connected to a signal line 59 connecting the moving control table 37 and the transport end 33. Therefore, an emergency interrupt occurs and the switching device 402 is controlled to switch. Since the terminal station that caused the interruption and the mobile control console 11 of the control station are directly connected by a dedicated mobile station line, they can immediately communicate with each other. Even when the mobile control console 11 is in communication with a mobile station, the mobile station does not need to stop transmitting radio waves, and only needs to stop the communication while the terminal station that interrupted the communication is in communication. Therefore, if the control console determines that the information on the mobile station is more important than the information on the interrupted terminal station, the call with the mobile station can be immediately resumed.

As described above, according to the present invention, emergency interrupt communication can be performed immediately without interrupting communication with the control station control console with a simple configuration that requires only a switch.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an example of a disaster prevention administrative radio system, FIGS. 2 and 3 are configuration diagrams of a control station and a branch station according to an embodiment of the present invention, and FIGS. 4 and 5 are configuration diagrams of a control station and a branch station according to an embodiment of the present invention. FIG. 2 is a configuration diagram of a control station and a branch station according to another embodiment of the present invention. 1...control station, 2...multiple radio line, 3...branch station, 4...single radio line, 5...terminal station.

Claims (1)

[Scope of Claims] 1. A control station having a control station, a branch station connected to the control station via multiple wireless lines, and a plurality of terminal stations connected to the branch station via a single wireless line, The control station and the branch station are each provided with an exchange that accommodates at least one of the plurality of lines to be multiplexed, and communication is carried out between the control station wired terminal, the branch station wired terminal, and the terminal station by exchange connection. In a communication system that performs the At the same time as cutting off the connection between the terminal station and the control station, connect a single radio line to a line that is not accommodated in the switch either in the branch station or the control station, and connect the interrupted terminal station and the control station. An emergency interrupt communication method for a terminal station in a communication system, characterized in that it enables communication at a terminal station. 2. A terminal station emergency interruption communication system in the communication system according to claim 1, characterized in that the line that is not accommodated in the exchange in either the branch office or the control station is a meeting line for multiplex radio equipment. . 3. Claim 1, characterized in that the line that is not accommodated in the exchange in either the branch station or the control station is a line provided for the mobile station to communicate with the branch station and the control station. A terminal station emergency interrupt communication method in a communication system.