JP2008091990A - Method of testing line of communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of testing the line of a communication system for testing the communication state between a master station and each slave one for confirmation by relatively simple work. <P>SOLUTION: In the method of testing the line of the communication system for connecting a plurality of slave stations mutually via a radio or cable line along with a master station, and transmitting a simultaneous command from the master station to the slave one, line test data are superposed on the starting signal of the simultaneous command for transmitting to the plurality of slave stations when the communication system transmits the simultaneous command (1). In the method, each of the plurality of slave stations receives the simultaneous command, receives the line test data transmitted by superposition on the command for grasping a line state to the master station to create the reception result of the line test data, and superposing the reception result of the received line test data for returning when a confirmation signal to the simultaneous command is transmitted (2). Additionally, the master station grasps a line state among the plurality of slave stations, based on the reception result of the line test data superposed by each slave station for returning (3). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a line test method for a communication system that tests a line state in a communication system, and more particularly to a line test method for a communication system in a communication system that transmits a simultaneous command from a master station to a large number of slave stations.

  Conventionally, for example, as represented by disaster prevention administrative radio, a control station (parent station) located in the center of the government and a large number of slave stations arranged in remote areas are connected by wireless lines or wired lines, In an emergency such as the occurrence of a disaster, a communication system (that is, a simultaneous command system) that transmits a command for the occurrence of a disaster from the control station (parent station) to a plurality of slave stations all at once, for example, It is already known from Patent Document 1 below.

That is, in the communication system known from this patent document 1, in order to transmit a simultaneous command between a master station and a plurality of slave stations more reliably and more quickly regardless of the state of the line, not only the ground line but also the satellite According to this, when issuing a simultaneous command from the control station to the slave station, the control station uses both of the above lines to send a start signal for the simultaneous command. On the other hand, on the other hand, the slave station side receives the simultaneous command by the activation signal of the simultaneous command previously received out of the two lines.
Japanese Patent Laid-Open No. 10-271063

  As described above, in the prior art, by using a satellite channel together with a ground channel, regardless of the channel status between the master station and the plurality of slave stations, for example, even if one channel status is abnormal, By using a line, it is possible to transmit a simultaneous command more reliably and quickly. However, there are no considerations regarding grasping the line status between a master station and multiple slave stations. Was not.

  By the way, in general, in such a communication system, a line test (so-called maintenance) is performed between a master station and a plurality of slave stations even in an emergency in order to ensure reliable communication in the event of a disaster. In this case, however, it is usually performed by transmitting a simultaneous command from the master station and receiving it at each slave station. More specifically, each slave station receives the simultaneous command transmitted from the above master station, and based on the reception result, grasps the reception status between the master station and each of the slave stations. Is done by doing.

  Therefore, in the conventional communication system line test method, it is necessary for each slave station to grasp the reception state between the master station and each slave station. Proportional. In particular, in the communication system used in the disaster prevention administration, which generally has a large number of slave stations, there is a problem in that the work and work for that is enormous, resulting in an economical burden. It was.

  Therefore, the present invention has been made in view of the above-described prior art, and further, the problems in the conventional communication system line test method. An object of the present invention is to provide a communication system line test method capable of testing and confirming a communication state with a slave station.

  According to the present invention, in order to achieve the above-described object, a plurality of slave stations are connected to each other via a wireless line or a wired line together with the master station, and a simultaneous command is issued from the master station to the plurality of slave stations. In a communication system for transmitting, a line test method of a communication system for performing a test of the line, wherein when the simultaneous command is transmitted by the communication system, line test data is superimposed on a start signal of the simultaneous command, Transmitting to a slave station, each of the plurality of slave stations receives the simultaneous command, and receives the line test data transmitted superimposed on the command, and grasps the line status with the master station The line test data reception result is created, and when the confirmation signal for the simultaneous command is transmitted, the reception result of the received line test data is superimposed and returned. Superimposed and returned Based on the reception result of the line test data, there is provided a line testing method for a communication system to grasp the line status between the plurality of slave stations.

  That is, according to the above-described line test method for a communication system according to the present invention, it can be executed by a relatively simple operation, and the communication state between the master station and each slave station is actually tested and confirmed. Therefore, it is possible to provide a line test method for a communication system capable of performing a line test (so-called maintenance) between a master station and a plurality of slave stations more reliably. In particular, it is possible to achieve an excellent effect.

Hereinafter, a communication system line test method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
First, the attached FIG. 1 is a block diagram showing the configuration of a communication system in which the line test method of the present invention is performed. Reference numeral 1 in the figure denotes, for example, a local disaster prevention system, such as a prefectural office or the like. A master station (control station) to be arranged is shown. On the other hand, reference numeral 2 in the figure denotes a plurality of slave stations arranged in remote areas such as local municipalities.

  Further, as shown in the figure, the master station (control station) 1 includes, for example, a command board 4 constituted by a so-called computer including an input / output device for inputting and displaying a simultaneous command. And is connected to a wireless line or a wired line 7 via the master station line control device 3. Here, the wireless line includes satellite communication, and the wired line includes a ground line.

On the other hand, the slave stations _{21 to n} arranged in large numbers in the remote areas are also equipped with the command bases ₆₁ to _n composed of computers, similar to the master station (control station) 1. Again, it is connected to the wireless line or the wired line 7 via the station line control devices ₅₁ to _n . That is, the master station (control station) 1 and a large number of slave stations 2 are connected to each other via the wireless line or the wired line 7. For example, in the event of an emergency such as a disaster, the control station (master station) Can be transmitted simultaneously to the above-mentioned many slave stations.

Next, the line test method according to the present invention in the communication system capable of simultaneous command described above will be described with reference to FIGS.
First, FIG. 2 attached is a flowchart showing a flow of a line test method according to the present invention, and FIG. 3 is a sequence diagram showing an operation sequence at this time.

As shown in FIG. 2, in order to transmit a simultaneous command from the master station to the plurality of slave stations ₂₁ to _n , first, a start signal for starting the slave station is generated, and data for line test is also generated. And an activation signal is transmitted to the slave station (step S21). An example of this activation signal and the line test data superimposed thereon is shown in FIG. 4 attached thereto, and as is apparent from the figure, the activation signal superimposed with this line test data is shown in FIG. Subsequently, a command from the control station (master station) 1, that is, a simultaneous command is transmitted. Further, as shown in the sequence diagram of FIG. 3, the line test data is superimposed on the activation signal for activating the slave stations 21 to _n , and transmission is performed for a predetermined time (see reference S21).

Next, each of the slave stations _{21 to n that} has received the activation signal on which the line test data is superimposed generates a confirmation signal for confirming that the activation signal has been received. In this case, the confirmation signal is superimposed on the activation signal. The transmitted line test data is also received. Then, based on the reception result of the line test data, each slave station 2 grasps the line state with the control station (parent station) 1 and superimposes it on the confirmation signal as the line test data reception result, The data is transmitted to the control station (master station) 1 (step S22).

Here, the line state (that is, the line test data reception result) between each slave station 2 and the control station (parent station) 1 is, for example, as shown in FIG. By superimposing the digital data whose contents are set in advance and transmitting from the control station (master station) 1, on the slave station 2 side that has received this, based on the contents of the received digital data, By checking the error rate, it can be easily grasped. Further, when transmitting from the slave stations ₂₁ to _n to the control station (parent station) 1, transmission is performed at regular intervals so as not to overlap each other. Note that this situation is also indicated by reference numeral S22 in FIG.

Thereafter, the control station (master station) 1 confirms reception of the confirmation signals from the slave stations ₂₁ to _n , and then transmits the contents of the simultaneous command for an arbitrary time (step S23).

Next, each of the slave stations _{21 to n that} has received the contents of the simultaneous command from the control station (parent station) 1 transmits a confirmation signal to the control station (parent station) 1 (step S24). If there is another general command, the same operation as described above is repeated (step S25), and after the transmission of all the general command contents is completed, an end signal for terminating the slave station is finally sent for a certain period of time. Transmitting to the slave stations ₂₁ to _n (step S26), the series of operations is terminated. At this time, the confirmation signal includes, for example, that the command content is being received, is normally received, or is abnormally received. ₂₁ to _n are determined at the transmission timing of the confirmation signal.

Then, according to the above, the control station (master station) 1 transmits the line state (that is, based on the reception result of the line test data at each of the slave stations _{21 to n} together with the above confirmation signal (that is, Since the line test data reception result) is received, it is possible to easily check the line status between the master station 1 and a plurality of slave stations by using the received line status. Become.

As an example, for example, as shown in FIG. 5 attached, the error rate obtained for each of the slave stations ₂₁ to _n on the horizontal axis is displayed, while the error rate on the vertical axis is displayed. If a predetermined reference value (Th) is set for the communication line, it is possible to easily check the line status with a plurality of slave stations in the communication system. Such a graph can be displayed on a display of an input / output device constituting the command board 4 provided on the master station (control station) 1 side. In addition, for analysis of the line status with a plurality of slave stations, by using a computer constituting the command board 4, for example, by storing a predetermined analysis program in a storage device in advance, It can also be done automatically. In addition, the line status with the control station (parent station) obtained in each of the slave stations _{21 to n} is also displayed on the computer display of the reception desks 61 to _n that constitute each of the slave stations. It would also be possible. Also, an alarm or the like may be sounded when displaying the line status between each slave station.

Furthermore, in the above description, the line state (that is, the line test data reception result) between the plurality of slave stations ₂₁ to _n and the control station (parent station) 1 uses digital data superimposed on the activation signal. However, in the present invention, the present invention is not limited to this, and the line state between the slave station and the control station (parent station) can be understood. Other methods can also be used, if any.

  In addition, according to the line test method of the communication system described above, not only during maintenance, but also in the transmission of simultaneous commands in the event of an actual disaster, the individual line status with each slave station is changed to transmission of simultaneous commands. Since it can be grasped at the same time, it also achieves an excellent effect that makes it possible to transmit a simultaneous command more reliably.

It is a block diagram which shows the structure of the communication system with which the line test method which becomes this invention is performed. It is a flowchart figure which shows the flow in the line test method of the said invention. It is a sequence diagram which shows the operation | movement sequence of the line test method of the said invention. It is a figure which shows the detailed structure of the simultaneous command signal at the time of performing the line test method of the said invention. It is a figure which shows an example of the display of a line state in the line test method of the said invention.

Explanation of symbols

1 master station 2 _{1 to n} a plurality of slave stations 3 master station line control unit 4 command system 5 _{1 to n} a plurality of slave stations line controller 6 _{1 to n} a plurality of受令base 7 wireless line or a wired line

Claims (1)

A communication system for testing a line in a communication system in which a plurality of slave stations are connected to each other via a wireless line or a wired line together with the master station, and a simultaneous command is transmitted from the master station to the plurality of slave stations. The circuit test method of
Upon transmission of a simultaneous command by the communication system, the circuit test data is superimposed on the start signal of the simultaneous command and transmitted to the plurality of slave stations,
Each of the plurality of slave stations receives the simultaneous command, receives line test data transmitted superimposed on the command, grasps a line state with the master station, and transmits line test data. When creating a reception result and sending a confirmation signal for the simultaneous command, the reception result of the received line test data is superimposed and returned,
The master station, based on the reception result of the circuit test data superimposed and returned by each slave station, grasps the line status with the plurality of slave stations, and performs a line test of the communication system, Method.

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