JPS631783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disaster prevention administrative radio system that can secure a minimum unit of communication line even if a failure occurs in a part of the line system.

For example, the disaster prevention administrative radio system is a wireless system that connects the prefectural office, prefectural branch offices, municipal offices, etc. through communication lines, and is used for general administrative work at all times, while also transmitting prefectural instructions to each administrative agency in the event of a disaster. exists.

Figures 1 and 2 show a disaster prevention administrative radio system when a centralized system is adopted.
The system shown in Fig. 2, in which the same parts as in Fig. 1 are given the same reference numerals, is a system that performs communication without going through a relay station, and is different from the system shown in Fig. 1 in other respects. There are no differences. Therefore, the conventional system will be explained below with reference to FIG.

Prefectures (prefectures are exemplified below), which are wide-area local governments that encompass municipalities, have prefectural assemblies as voting bodies, governors as executive bodies, and various committees, and have leading administrative authority. For this reason, the control bureau is usually located at the prefectural office. On the other hand, local stations are located at prefectural branch agencies, civil engineering offices, joint government buildings, etc., and terminal stations are located at municipal offices, fire stations, etc.
In FIG. 1, a relay station is interposed between the control station and the local station or terminal station, and wireless communication is performed through the relay station installed at the top of a mountain or the like. For this reason, in addition to the switching device 1, the control station is equipped with a multiplex radio device 2 that performs multiplex radio communication with the relay station; A multiple radio device 4 for performing multiple radio communication between the device 3 and local stations, and a single radio device 5 for performing single radio communication between the terminal station and the terminal station are provided. Further, in addition to the extension telephone 6, the local station is equipped with a multiplex radio device 7 for performing multiplex radio communication with the relay station, and the terminal station is equipped with each telephone 8.
A selective calling device 9 and a single radio device 10 are provided for each.

The wireless system shown in FIG. 1 employs a centralized system centered on a control station. That is, each extension telephone 6 of a local station has multiplex radio equipment 2, 3,
By means of multiple radio line systems 15 and 16 via multiple antennas 11 to 14 attached to telephones 4 and 7, the single radio equipment 5 of the relay station in the area, which has jurisdiction over a plurality of terminal stations where telephones 8 are installed, The aforementioned multiplex radio line systems 15 and 16 and selective calling device 1
7 to the switching device 1 in the control station without intersecting with each other. Therefore, if a failure occurs in the multiplex radio line system 15 connecting the relay station and the control station and the line is disconnected, communication between the stations becomes completely impossible. Similarly, even in the wireless system shown in Figure 2 which adopts the centralized system, if a failure occurs in the multiplex wireless line system 15 connecting the local stations and the control station and the line is disconnected, calls between each station will be completely impossible. .

The present invention was made in view of the above circumstances, and even if a failure occurs in the multiplex radio line system that exists between a relay station and a control station or between a local station and a control station, it is possible to The purpose of this invention is to provide a disaster prevention administrative radio system that can secure the minimum number of telephone lines between local stations and the terminal stations under their jurisdiction.

In the present invention, a switch means is provided for switching and connecting the direct line between the local station and the control station to the direct line between the local station and the terminal station. If the above-mentioned failure occurs in the line, the connection is switched to a direct line between the local station and the terminal station, and the selective calling function is completely canceled from the local station to the terminal station under its jurisdiction, allowing voice calling. Achieve your goals.

The present invention will be explained in detail with reference to Examples below.

Parts that are the same as those in Figure 1 are designated by the same symbols in Figure 3.
The figure shows an example of a wireless system using relay stations. In this wireless system, a line whose end is connected to a plurality of terminal stations via a single radio device 5, centered around a switching device 1 in a control station, is connected to a multiplex radio device 2 via a selective calling device 17 in the control station. It is connected to the. On the other hand, a line whose terminal end is connected to a local station is connected to the multiplex radio device 2 without going through the selective calling device 17. In the former case, it is necessary to transmit a multi-frequency signal corresponding to a dial number over a single radio line system 31 between a single radio device 5 in a relay station and a single radio device 10 in a plurality of terminal stations. This is because that.

Of these two types of lines, a part of the latter line that connects the exchange 1 and the multiplex radio device 2 without going through the selective calling device 17 carries a ringer with a signal frequency of, for example, 3850 Hz outside the call band. ing.

The control station supplies the data supplied from the above lines to the multiplex radio equipment 2 within the control station to the multiplex radio equipment 3 within the relay station via the multiple radio link system 15. There are cases where data is transmitted via multiple relay stations to a specific local station and the terminal station under its jurisdiction, but for the sake of simplicity, the relay stations shown in the figure are the local station and the terminal station under its jurisdiction. Suppose that it is a relay station that branches.

A group of lines connected wirelessly between the control station and the relay station are led from the multiplex radio device 3 in the relay station to the first line switching device 32. The first line switching device 32 is an X relay 32 that detects the 3850Hz ringer sent from the control station through a part of the line.
1. Relay contact 322 that turns on when the X relay 321 no longer detects the ringer, Y relay 3 that is driven by the operation signal supplied from the local station
23, and first and second relay contacts 324 and 325 that switch the contacts by driving the Y relay 323. When the Y relay 323 is not driven, one extension telephone 6A in the local station is connected to the switching device 1 in the control station by the first relay contact 324, and the single radio device 5 in the relay station is also connected to the second The relay contact 325 is connected to the switching device 1 in the control station via the selective calling device 17. On the other hand, when the Y relay 323 is driven by the operation signal sent from the local station, the relay contacts 324 and 325 are switched, the line with the control station is disconnected, and the extension telephone 6A
and a single radio device 5 are connected within the relay station. Note that the other extension telephones 6B in the local office are connected to the control station without going through the line switching device 32, as in the conventional system.

Now, when a failure occurs in the multiplex wireless line system 15 connecting the control station and the above-mentioned relay station and the line is disconnected,
X relay 321 in line switching device 32 is activated. This turns on relay contact 322,
A relay control signal (earth) is output and transmitted to the local station via multiplex radio link 16. A second line switching device 33 is provided at the local station. The second line switching device 33 includes a switch 331 that sends an operation signal to the Y relay 323, and a relay contact 32.
A relay 332 for line failure detection that detects the relay control signal sent via 2, A relay 332
A relay contact 333 that turns on when activated, an indicator lamp 334 that is connected to the relay contact 333 and lights up in the event of a line failure, and a signal source 33 for canceling the selective call function.
5, a selective call function recovery signal source 336, a selective call function release signal activation switch 337, and a selective call function recovery signal activation switch 338. Therefore, when the multiplex radio device 7 supplies the relay control signal sent through the relay contact 322 to the A relay 332 in the second line switching device 33, the A relay 332 is activated. As a result, an indicator lamp 334 whose one end is connected to a power supply (not shown) lights up.

A failure does not necessarily occur in all of the multiplex radio line system 15 that connects the control station and the relay station, but often occurs in a part of it. Therefore, multiple sets of X relays 321 for detecting line faults may be installed. The line switching device operator at the local station determines whether or not to connect the local station and the terminal station via a direct line, taking into account various conditions such as the lighting state of the indicator lamp 334 and the nature of the disaster. If it is determined that it is appropriate to connect the local station and the terminal station through a direct line, the switch 331 is turned on. As a result, the operation signal is supplied to the first line switching device 32 through the multiplex radio line 16, and the Y relay 323 is activated.

When the Y relay 323 is activated, its two contacts 324 and 325 are switched. As a result, a line is formed between the extension telephone 6A in the local office and the single radio device 5 on the relay station side. However, local stations are not equipped with selective calling equipment like the control stations. Therefore, in this state, a telephone call cannot be made between the extension telephone 6A in the local office and the telephone 8 in the terminal station. Therefore, the operator of the line switching device at the local station switches the selective call function cancel signal activation switch 3 connected to the selective call function cancel signal source 335.
Press 37. Then, a signal for canceling the selective calling function is sent to the selective calling devices 9 of all the terminal stations in charge through the newly formed line. As a result, the selective calling function of each terminal station under its jurisdiction is canceled, and the extension telephone 6A of the local station becomes able to talk to all the telephones 8 of the terminal station under its jurisdiction. Therefore, when calling a specific terminal station from a local station, a method is adopted in which the number or name of the terminal station is called out by voice through a handset.

In this way, even in an abnormal situation where the line is cut off, it is possible for the prefectural branch agency to thoroughly follow the prefecture's instructions to subordinate agencies, or for the branch agency to understand the disaster situation.

On the other hand, when the disconnected multiplex radio line system is restored, the 3850Hz ringer is sent from the control station to the relay station again. As a result, the first line switching device 32
The X relay 321 in the second line switching device 33 is deenergized, the A relay 332 in the second line switching device 33 is also deenergized, and the indicator lamp 334 turns off. The line switching device operator thereby recognizes that the line has been restored and presses the selective calling function recovery signal activation switch 338.
As a result, a selective call function recovery signal is transmitted from the selective call function recovery signal source 336 to all the terminal stations in charge via the multiplex radio line system 16, the first and second relay contacts 324 and 325, and the single radio device 5. The selective calling device 9 of each terminal station restores its function. Thereafter, the second line switching device operator turns off the line switching switch 331. As a result, the operation signal sent from the local station to the relay station is cut off, and the Y relay 323 is de-energized. And Y
The relay contacts 324 and 325 of the relay are restored and the normal line configuration is restored.

The operator of the line switching device can check the lighting status of the indicator lamp 334 and restore the line to its normal configuration even if part of the multiplex radio line system 15 is disconnected. As a result, the local station and the terminal station are no longer connected by a direct line, but instead, the local station operator can receive instructions from the control station through an unbroken line between the control station and the relay station.

The same parts as in Fig. 3 are given the same reference numerals as in Fig. 4.
The figure shows an example of a wireless system that does not involve a relay station. In this embodiment, first and second line switching devices 32 and 33 are arranged in a local office that branches a single radio line and a local office internal line. The ringer for line failure detection is connected to the X relay 3 via the multiplex radio equipment 7 in the local station.
21. Similarly, the first and second contacts 324 and 325 of the Y relay 323 switch the connection destination of the extension telephone 6A to the multiple radio line system 15 or the single radio line system 31 within the local office.
There is no difference in operation between the first and second line switching devices except that a wired line is connected between them. Note that since the X relay 321 and the A relay 332 for failure detection are arranged in the same local station, one of them can be omitted as appropriate.

As described above, according to the present invention, even in a centralized disaster prevention administrative system, if a failure occurs in the main multiplex line system, the minimum unit of communication line can be configured between the local station and the terminal station under its jurisdiction. .

In this embodiment, the operator of the line switching device in the local station made the decision to switch the line, but it is of course possible to configure the circuit so that the line is automatically switched by excitation of the X relay.

[Brief explanation of the drawing]

Figure 1 is a system diagram of a conventional disaster prevention administrative radio system that uses a centralized method and goes through a relay station. Figure 2 is a system diagram of a conventional disaster prevention administrative radio system that uses a centralized system and does not go through a relay station. , FIG. 3 is a system diagram of a disaster prevention administrative radio system in which a centralized system is used in one embodiment of the present invention and relay stations are used, and FIG. It is a system diagram of a disaster prevention administration system when there is no intervention. 1...Switching device, 2, 3, 4, 7...Multiple radio device, 5...Single radio device, 6...Extension telephone,
8... Telephone, 9, 17... Selective calling device, 1
5, 16...Multiple radio line system, 32, 33...Line switching device, 321...X relay, 322, 32
4,325...Relay contact, 323...Y relay, 331...Switch, 335...Selective call function release signal source, 336...Selective call function recovery signal source, 337...Selective call function release signal activation 338...Switch for starting selective call function recovery signal.

Claims (1)

[Claims] 1. A control station that is equipped with a switching device and that connects the lines of all stations to the switching device via multiplex radio circuits, with or without one or more relay stations, so that they do not cross each other, and a control station that is installed in each region. local stations that communicate with the control station via multiplex radio lines, and multiplex radio lines between the control station and relay stations established corresponding to each local station, or between the control station and the local stations and the nearest relay station or local station. In a centralized radio system consisting of multiple terminal stations that perform selective calling via a single radio line from the station, a single radio line and multiple radio lines to local stations, or a single radio line and local station internal lines. means for detecting a line failure between the control station and the relay station or between the control station and the local station at the nearest relay station or local station that branches from the control station;
A line switching means is provided to switch the line connecting the extension telephone of the local station and the control station to the line connecting the local station and all the terminal stations under its jurisdiction, and the local station has a selective calling function of the selective calling device of all the terminal stations under its jurisdiction. When the line is switched by the line switching means, the function of the selective calling device of all the terminal stations is canceled, and a voice call can be made from the local station to the terminal station under its jurisdiction. A disaster prevention administrative radio system characterized by: