JPH01126056A - Restoration system at faulty main line - Google Patents

Abstract

PURPOSE:To attain call by a main line at an earlier time by switching a line into a slave public line when a private line being a master line is faulty during polling to a slave station and applying a call test of the master line when the slave line is faulty. CONSTITUTION:When polling command to a slave station takes place, a line control section 10 in an information transmitter 1 being a master station uses a line selection control means 12 to send a signal 121 to a call means 14 to start a private line 16 to a slave station and the call data from the master station 1 is sent to the slave station. When no fault exists, a reply data is returned from the slave station. When no reply comes even after a prescribed time elapses, a fault detection signal 111 is outputted from a fault detection means 11 and a line selection control means 12 sends the signal 122 to a connection call means 15 and is connected to the slave station by a public line 17. When a fault place and no reply comes from the slave station, the fault is detected and the line selection control means 12 does not retry the public line 17 but calls the private line 16 immediately. Thus, the call by the main line is executed in an earlier time.

Description

[Detailed Description of the Invention] [Summary] When collecting data in a remote bag using an information transmission device having a duplex line in which a dedicated line is the main line and a public line is the secondary line, a failure occurs in the main dedicated line. Regarding the recovery control method when a failure occurs in the main line, when a connection operation is performed using the public line of the slave line due to an error, the waste caused by repeating the connection operation from the slave line when connection with the other party is not possible. The purpose is to provide a main line abnormality recovery method that reduces the recovery time, and to collect data from remote devices using a polling method. In the recovery method when the main line is abnormal in transmission equipment, when the main line is abnormal, a connection operation is performed by the secondary line, and when the result is abnormal, a paging test is performed on the main line without retrying by the secondary line. The configuration is configured to control line selection.

[Industrial Field of Application] The present invention is applicable to a case where a fault occurs in the main dedicated line when collecting data from a remote device using an information transmission device having a duplex line in which a dedicated line is the main line and a public line is the secondary line. Regarding the recovery control method when

Recently, multimedia networks that provide various types of information and mutually transmit information are being put into practical use by connecting wide areas.

In such systems, due to the nature of the network, status information such as whether each part of a large number of remote network subsystems is operating normally or whether an alarm (failure) has occurred is always available at the central master station. It is necessary to understand.

In that case, the master station is a small-scale remote network (slave station)
Data is collected by sequentially calling up status information using a polling method, but in this case, a so-called duplex line configuration with two lines is used in case of line failure.

However, two lines are not used all the time, and even when handling important and frequent data, it is costly to use two dedicated lines with high line usage charges for small slave stations. Therefore, public lines (telephone lines) are used as backup secondary lines.

In such a data collection transmission device that uses a dedicated line as a main line and a public line as a secondary line, it is desired to quickly restore the main line when an abnormality occurs.

[Conventional technology] Figure 3 (al) shows the system configuration of a conventional example.

In Fig. 3 1al, 30 is a master station that is a transmission device that collects monitoring data, 31 is a dedicated line that is a main line connected to a certain slave station 33, and 32 is a slave station used to connect to a slave station. A public line (telephone line) is a line, 33 is a slave station that holds status information of each part of a remote network system, 34 is an exchange, and 35 is a network system. In such a conventional system configuration, the master station 3
The operation of calling the slave station 33 from 0 will be explained.

The master station 30 is equipped with lines for a large number of slave stations (not shown), and sequentially calls the slave stations by polling to collect status information of each slave station.

When the slave station 33 is specified by polling, the dedicated line of the main line is activated and the transmission section of the slave station 33 is activated. When the master station transmits call data, the slave station 33 receives the data. is decoded and the monitoring data 331 is transmitted from the dedicated line. When the transmission data is normally received by the master station 30, the connection with the slave station is terminated.

If a failure occurs in the connection operation of the slave station 33 using the leased line of the main line and monitoring data cannot be collected, that is, when no response is returned from the slave station to the activation of the leased line. , when there is an error in the received data, conventionally, the operation flow shown in FIG. 3 (bl) is executed.

When a failure occurs on the main line, the master station performs an operation to connect to the slave station 33 via the public line of the secondary line (300 in Figure 3(b)).This operation automatically transfers the telephone number of the slave station 33. In response to this dialing, if the line or the other party's device is not busy, the transmission equipment of the master station is connected to the transmission equipment of the other slave station via an exchange (including multiple exchanges), and this connection operation is performed. When connected to the transmission device of the other slave station 33, the master station transmits the calling data of the slave station 33 through this slave line, and causes the slave station to transmit the monitoring data held in the slave station (320). .

If an abnormality is detected in which connection is not established within a predetermined time due to the other party talking after dialing, etc., the number of times this abnormality has occurred is counted and the number of times is n (usually n = l0).
It is determined whether n has been reached (step 340), and if it is less than n, the connection operation using the secondary line is executed again. When the error of not connecting to the other party reaches n times, the line connection error will be displayed.
and then starts calling processing for the slave station via the main line.

[Problems to be Solved by the Invention] According to the conventional operation flow when the main line is abnormal, if the connection operation using the slave line is not successful, the connection operation (dial operation) is performed many times.

However, since it takes about 1 minute (the time required for the dialing operation and the time required to detect that it is busy) for one connection operation using the public line of this secondary line to abnormally terminate, when switching to the secondary line, the maximum There is a problem in that data collection may not be possible for a period of n minutes, making it difficult to quickly collect and detect alarm information of a monitored object using monitoring data.

The present invention reduces wasted recovery time caused by repeating the connection operation from the secondary line when connection with the other party cannot be made when a connection operation is performed using the public line of the secondary line due to an abnormality in the dedicated line of the main line. The purpose is to provide a main line abnormality recovery method.

[Means for solving problems] The basic configuration of the present invention is shown in FIG.

In FIG. 1, 1 is an information transmission device of the master station, 10 is a line control unit, 11 is a main line abnormality detection means, 12 is a line selection control means, 13 is a slave line abnormality detection means, and 14 is a main line. A dedicated line calling means, 15 a connection calling means for a public line which is a secondary line, 16 a dedicated line, and 17 a public line.

In addition, configurations related to call data (instruction to read monitoring data) to the slave station and received data sent from the slave station are omitted in FIG.

The present invention is characterized in that, compared to public line connections in which connections are made through general exchanges, dedicated lines are connected without going through connection processing by exchanges, so the probability of failure occurring is low; Even if it occurs, it recovers quickly (
This method focuses on the fact that data errors may occur for a short period of time if the leased line is routed through a wireless relay line.

According to the present invention, if an abnormality is detected when a slave station is called on the dedicated line of the main line by polling, a connection is made to the slave station on the public line of the slave line, and if the connection is abnormal, the slave station is called. Instead of repeating the connection operation using the public line, a call test is first performed using the main line, and if a failure is detected in the call, reconnection is performed using the secondary line.

[Operation] FIG. 1 (bl) shows an example of the operation sequence of line abnormality data according to the present invention.

To explain the operation of the configuration of FIG. 1 (al) with reference to FIG. The means 12 first activates the calling means 14 of the dedicated !16 of the main line via the control line 121 (starting end of A of the first opening).

As a result, when the dedicated vA 16 is activated, it is connected to the transmission device of the partner slave station (not shown) without dialing or other operations since it is a dedicated line. After that, when the master station transmits the call data to the slave station, the monitoring data is sent from the transmission device of the normal funded slave station, so if this is checked and there is no error, the dedicated line is released.

In this calling operation, when the abnormality detecting means 11 detects an abnormality such as when there is no response from the other party's slave station or when there is an error in the data transmitted from the other party, the detection output 1
11 to the line selection control means 12 (first opening).

When the line selection control means 12 determines that a fault has been detected in the first call on the main line, it activates the connection calling means 15 of the public line 17 as the secondary line via the control line 122 (the first
Diagram (starting end of B in bl). The connection calling means 15 automatically dials the telephone number of the destination slave station transmission device, which is set in advance or given each time a connection is made.

If this connection operation fails to connect to the transmission device of the other slave station (due to busy etc.), the abnormality detection output 131 is output from the abnormality detection means 13 of the secondary line after a predetermined period of time (see Fig. 1).
end of B of bl).

When the line selection control means 12 receives this abnormality detection output 131, it counts the number of connection failures of the secondary line (maintained in a register not shown), and at the same time, immediately selects the main line without repeating connection calls by the secondary line. In order to do this, the control line 121 is driven and a paging test is performed using the dedicated line 16 of the main line (Fig. 1 (C in BL)). In this case, the test is to send the normal paging data and check whether a response is returned. This can be easily done by discrimination, but it can also be done by any other method.

If this test is performed normally, data will be collected using the dedicated line, but if it is abnormal (terminal C in Figure 1 fbl), an output will be generated from the abnormality detection means 11 of the main line.
The line selection control means 12 then selects the connection calling means 15 of the secondary line public line 17 and causes it to perform a second connection calling operation (starting end of D in FIG. 1(b)). (b
In the example, this connection call (D) fails, and then a call test using the main line is performed (E in Figure 1 (bl)).
, If this is successful, a calling operation is executed and monitoring data of the slave station is collected.

[Example] The operational flow of the embodiment of the present invention is shown in FIG. 2 (al).

FIG. 2 (al) shows the flow of the control operation by the line selection control means 12 (FIG. 1(a)) of the line control section of the information transmission device.

When a main line abnormality occurs first, the 10 times counter is incremented by 1 (200 in Figure 2 (al)), then the secondary line connection operation is started (210 in the same figure), and if the connection is made with the other party by that connection operation, the The master station transmits call data for collecting slave station data through the slave line, and receives monitoring data (230).

If connection with the transmission device of the other slave station cannot be established, check whether the number of times on the counter has reached n (in this case, n-3), and if it has not, then perform a main line paging test. (260).

If this test completes normally, a message indicating that the line connection abnormality is minor will be displayed (280).
Then, officially start the main line call processing to collect data (not a test) (290). If the main line call test ends abnormally, after adding 1 to the contents of the number counter. The process moves on to the connection operation using the secondary line again.

When the number of connection operations by the secondary line increases and the value of the number counter reaches n, a message indicating that the line connection abnormality is severe is output and displayed (250), and the next main line call process is performed. (290) is started.

FIG. 2 (bl) shows an example of the operation sequence according to the operation flow of the embodiment.

In the first example (a), if the main line paging operation becomes abnormal, a main line abnormality message is issued, the operation shifts to the slave line operation, and if the slave line connection operation is abnormal, a main line paging test is performed. If this test turns out to be abnormal, the slave line will operate next.
As shown in the figure, if the main/slave operation is repeated three times, a major failure will occur in the slave line.

Next, in the example (b), if the calling operation of the main line becomes abnormal, a main line abnormality message is issued and the operation shifts to the slave line.

If the secondary line connection operation is abnormal, perform a main line paging test,
If this is done normally, the secondary line operation is stopped and processing is performed by the main line.

[Effects of the Invention] According to the present invention, even when there is an abnormality in the public line of the secondary line, by immediately performing a paging test on the dedicated line of the main line, it is possible to quickly make a call on the main line. Additionally, it is possible to recover from an error without using the secondary line frequently.

[Brief explanation of the drawing]

Figure 1 (al is a diagram showing the principle configuration of the present invention, Figure 1 (
b) is a diagram showing an example of the operation sequence when a line abnormality occurs according to FIG. Figure 3 (al is a diagram showing the system configuration of the conventional example, and Figure 3 a (b) is a diagram showing the operation flow when the main line is abnormal in the conventional example. In Figure 1 fal, 1: Main station information transmission device 10: Line control unit 11: Main line abnormality detection means 12: Line selection control means 13: Sub-line abnormality detection means 14: Dedicated line calling means 15: Public line connection calling means 16: Dedicated line 17: Public line

Claims (1)

[Claims] Recovery method in the event of a main line abnormality in an information transmission device (1) having a duplex line in which a dedicated line (16) is the main line and a public line (17) is the secondary line in order to collect data from remote devices by polling method is characterized by controlling line selection so that when the main line is abnormal, a connection operation is performed by the secondary line, and when the result is abnormal, a paging test is performed on the main line without retrying by the secondary line. A recovery method in the event of a main line abnormality.