JPH06224888A - Multiplex transmission line switching device - Google Patents

Abstract

PURPOSE:To suppress transmission jam at a minimum by judging the abnormality of a transmission line when the state of inputting received data from transmission line is continued for prescribed time, and switching it to any normal transmission line. CONSTITUTION:When the input of a selected side transmission line transmitting signal 10 is interrupted for prescribed time and the input of a non-selected side transmission line transmitting signal 11 is present for prescribed time, a non-selected side transmitter transmitting signal detection circuit 9 outputs a non-selected side transmission line transmitting signal detecting output 13. In this case, a selected transmission line switching signal generating circuit 7 outputs a switching signal corresponding to an instruction from a transmission processing circuit 5. Thus, in the case of the switching signal on the side of a receiver 3A1 for I system, for example, switches a-b and d-e are connected at a transmission line changeover switch 8a or in the case of the switching signal on the side of a receiver 3B1 for II system, switches a-c and d-f are connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiplex transmission line switching device of a data processing device having a multiplex transmission line, and in particular, when an abnormality occurs in the selected transmission line, the selected transmission line can be quickly made normal. The present invention relates to a multiplexing transmission line switching device that switches to a different transmission line.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional example of a multiplexed transmission line switching device having multiplexed transmission lines and selecting one of the transmission lines.

This example shows a case of a duplicated transmission line, and a data processing device 2 is connected to a transmission line I system 1A and a transmission line II system 1B. The data processing device 2 has an I-system receiver 3A1, an I-system transceiver 3A2, an II-system receiver 3B1, an II-system transceiver 3B2, a multiplexing transmission line switching device 4, a transmission processing circuit 5, and a transmission control circuit 6. ing. The multiplexed transmission line switching device 4 is composed of a selective transmission line switching signal generation circuit 7 and a transmission line switching switch 8.

The I-system receiver 3A1, the I-system transceiver 3A2, the II-system receiver 3B1 and the II-system transceiver 3B2 transmit data with other data processing devices via the corresponding transmission paths. That is, in the data processing device 2, another data processing device that is transmitted from both the transmission line I system 1A and the transmission line II system 1B and is connected to the transmission line I system 1A and the transmission line II system 1B is used. Are interacting with each other. In this case, as the received data from the other party, either the data of the transmission path I system 1A or the transmission path II system 1B is selected. This is the transmission processing circuit 5
, The selected transmission path switching signal generation circuit 7 in the multiplexing transmission path switching device 4 sends a switching signal to the transmission path switching switch 8 and is connected to the transmission processing circuit 5 for the I system receiver 3A1 or the II system receiver. Switching to receiver 3B1.

[0005]

However, the conventional apparatus shown in FIG. 4 has a problem that a traffic congestion occurs when the transmission line fails.

For example, in a state where data received from the transmission line I system 1A is selected and data is exchanged with another data processing device, some trouble occurs in the transmission line I system 1A and the received data is Suppose you no longer type. In such a case, it is necessary to detect a failure in the transmission line and promptly switch the selected transmission line to the normal-system transmitter.

However, the failure is generally detected by a timeout due to the fact that the response signal when the data processing device corresponding to the transmitted data is received has not been received for a certain period of time. The monitoring time of these transmission lines needs to have a certain margin time, and is generally set to be long. Therefore, during the monitoring time for these failure detections, the transmission path in failure remains selected, causing a problem of transmission congestion.

Therefore, the present invention is a multiplexed transmission line that detects an abnormality in the transmission line without waiting for various monitoring times for failure detection and promptly switches to the normal transmission line even if an abnormality occurs in the selected transmission line. An object is to provide a switching device.

[0009]

According to a first aspect of the present invention, received data from any one of the multiplex transmission lines of a data processing device for transmitting and receiving data via the multiplexed transmission lines. In the multiplex transmission line switching device that selects and switches the selected transmission line, when the reception data input from the selected transmission line is interrupted and the reception data input state from the non-selected transmission line continues for a predetermined time, it is selected. A means for judging an abnormality of the transmission path and a means for switching to a normal transmission path by the judgment of the abnormality of the transmission path by this means are provided.

According to a second aspect of the present invention, each of the duplexed transmission lines has respective transmission / reception means, and any one of the received data from the transmission lines received by the transmission / reception means is included. In the multiplex transmission line switching device of the data processing device that switches to the data received from the transmission line and is input to the transmission processing circuit as a transmission line transmission signal to perform data processing, in the selection side from the transmission line selected by the switching signal From the transmission path changeover switch, which is composed of two transmission line changeover switches, which inputs the transmission path transmission signal and switches to the transmission path from the non-selected transmission path to the non-selected side transmission path transmission signal. Input the selected side transmission line transmission signal, input the non-selected side transmission line transmission signal, the selected side transmission line transmission signal is cut off, and
Non-selected side transmission line transmission signal detection circuit that outputs the non-selected side transmission line transmission signal detection output when the state of inputting the non-selected side transmission line transmission signal continues for a certain time, and non-selected side transmission line transmission signal detection output Thus, a selective transmission line switching signal generation circuit for outputting a switching signal to the transmission line switching switch so as to input received data from a normal transmission line is provided.

[0011]

With the above structure, when the input of the reception data from the selected transmission line is interrupted and the reception data is input from the non-selected transmission line for a predetermined time, it is judged that the selected transmission line is abnormal. . Then, it is switched to a normal transmission path. Therefore, the abnormality of the transmission line is promptly determined, and the transmission line is switched to the normal transmission line, so that the transmission congestion can be minimized.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a data processing apparatus equipped with a multiplexing transmission line switching apparatus according to an embodiment of the present invention. The same reference numerals as those in FIG. 4 indicate the same or corresponding portions. The difference from FIG. 4 is that the transmission line changeover switch 8 has a different configuration and is used as a transmission line changeover switch 8a, and the non-selected side transmitter transmission signal detection circuit 9 is used. Is added.

Here, the transmission line changeover switch 8a is
There are two stations, and the switching signal is the I-system receiver 3A.
On the 1st side, the I-system receiver 3A1, the transmission processing circuit 5, and the non-selection-side transmission path transmission signal detection circuit 9 are connected, and further, the II-system receiver 3B1 and the non-selection-side transmission path transmission signal detection circuit 9 are connected. When the switching signal is on the II system receiver 3B1 side, the II system receiver 3B1, the transmission processing circuit 5, and the non-selected side transmission line transmission signal detection circuit 9 are connected, and further, the I system receiver. 3A1 and the non-selected side transmission line transmission signal detection circuit 9 are connected.
The non-selected-side transmitter transmission signal detection circuit 9 transmits the non-selected-side transmission line transmission signal when the input of the selection-side transmission line transmission signal 10 is interrupted for a predetermined time and the non-selected side transmission line transmission signal 11 is input for a predetermined time. The signal detection output 13 is output.

In the above configuration, the selected transmission path switching signal generation circuit 7 outputs a switching signal in response to an instruction from the transmission processing circuit 5. As a result, the transmission path changeover switch 8a is changed over as follows.

For example, in the case of a switching signal on the I system receiver 3A1 side, the switch ab and the switch de are connected, or when the switching signal on the II system receiver 3B1 side, a switch is used. ac and switch df
And are connected.

Now, assuming that the switching signal is on the I system receiver 3A1 side, the I system receiver 3A1 and the transmission processing circuit 5 and the non-selected side transmitter transmission signal detection circuit 9 are connected via the switches ab. Then, a line is connected from the I-system receiver 3A1 to another data processing device on the partner side via the transmission path I-system 1A, and data is transmitted and received.

At this time, the received data from the transmission line I system 1A is taken into the transmission processing circuit 5, and the selected side transmission line transmission signal 10 is input to the non-selected side transmission line transmission signal detection circuit 9. Further, at this time, the II system receiver 3B1 and the non-selected side transmission line transmission signal detection circuit 9 are connected via the switch de, and the non-selected side transmission line transmission signal 11 from the transmission line II system 1B is not selected. It is input to the side transmission line transmission signal detection circuit 9. In this embodiment, carrier signals are used as the selected-side transmission path transmission signal 10 and the non-selected-side transmission path transmission signal 11.

As shown in FIG. 2, the non-selected side transmission line transmission signal detection circuit 9 is composed of a counter 12, and the selection side transmission line transmission signal 10 is input to the input terminal of the reset signal of the counter 12, The selected side transmission path transmission signal 11 is the counter 1
It is connected so as to be input to the input end of the count-up signal of 2.

When the counter 12 counts a certain number of times, the counter 12 counts up and the non-selected side transmission line transmission signal detection output 13 is output.

For example, the non-selected side transmission line transmission signal detection circuit 9 operates at the operation timing shown in FIG. 3 when the count-up signal is three times, and first, at the time T0 in the first case.
Up to time T1, it is assumed that there is no abnormality in the transmission path I system 1A, the transmission path II system 1B, and the like, and the same waveform is input together with the selected-side transmission path transmission signal 10 and the non-selected-side transmission path transmission signal 11. In the first case, the counter 12 counts the non-selected side transmission line transmission signal 11 by one, but at the next non-selection side transmission line transmission signal 11, it is reset by the selection side transmission line transmission signal 10 and unselected. The side transmission line transmission signal detection output 13 is not output.

From the time T1 to the time T2 in the second case, the selection side transmission line transmission signal 10 is input to the counter 12, and the non-selection side transmission line transmission signal 11 is not input to the counter 12. The counter 12 is constantly reset and the non-selected side transmission line transmission signal detection output 13 is not output.

In the third case, in the state where the input of the selected side transmission line transmission signal 10 is interrupted at the time T3 after the time T2 and the signal is input to the non-selected side transmission line transmission signal 11, the non-selected side transmission line transmission is performed. When the signal 11 is input to the counter 12 three times, it is not reset by the selection-side transmission-path transmission signal 10. Therefore, the non-selection-side transmission-path transmission signal detection output 13 is output at time T4.

As a result, the non-selected side transmission line transmission signal detection output 13 is input to the selection transmission line switching signal generation circuit 7 shown in FIG. 1 and further input to the transmission processing circuit 5. The transmission processing circuit 5 determines whether or not switching is necessary, and when it is determined that switching is necessary, outputs a switching instruction for switching the selected transmission path to the selected transmission path switching signal generation circuit 7.

On the other hand, when the switching signal to the II system receiver 3B1 side is input to the transmission path switching switch 8a, the switches ac and df are connected, and the II system receiver 3B1 and the transmission processing circuit 5 are not selected. The side transmission line transmission signal detection circuit 9 is connected, the line is connected from the II system receiver 3B1 to the other side data processing device via the transmission line II system 1B, and data is transmitted and received. As a result, data is transmitted from the transmission line II system 1B to the transmission processing circuit 5 this time.
And the selected-side transmission path transmission signal 10 is input to the non-selected-side transmission path transmission signal detection circuit 9.

Further, the I-system receiver 3A1 and the non-selected side transmission line transmission signal detection circuit 9 are connected via the switch d-f, and the transmission line I-system 1A to the non-selection side transmission line transmission signal 1 are connected.
1 is input to the non-selected side transmission line transmission signal detection circuit 9.
As a result, the non-selection-side transmission path transmission signal detection circuit 9 counts up when the non-selection-side transmission path transmission signal 10 is not input to the predetermined count input of the non-selection-side transmission path transmission signal 11, and the non-selection-side transmission signal is transmitted. The path transmission signal detection output 13 is output.

As described above, the transmission line changeover switch 8a of the data processing device 2 is now connected to the transmission line I as shown in FIG.
If a disconnection occurs in the transmission path I system 1A while exchanging data while connected to the system 1A, the input of the received data signal from the transmission path I system 1A is interrupted. Since the transmission path II system 1B is normal, the received data signal is input as usual. In this state, the counter 12 of the non-selected side transmission line transmission signal detection circuit 9 counts up, and the non-selected side transmission line transmission signal detection output 13 is output. The transmission path changeover switch 8a switches the selected transmission path to the side of the normal transmission path II system 1B, so that the data processing device 2 can normally exchange data again.

The present invention is not limited to the above embodiment and can be implemented as follows.

(1) In the embodiment, the case where the transmission line is duplicated has been described, but the case where the transmission line is tripled or more can be implemented by slightly changing the non-selected side transmission line transmission signal detection circuit 9. In this case, if a majority circuit is incorporated in the non-selected side transmission line transmission signal detection circuit 9 to detect an abnormal transmission line, the reliability will be higher.

(2) In the embodiment, the non-selected side transmission line transmission signal detection circuit 9 is implemented by hardware, but it can be implemented by software processing. In this case, the non-selected side transmission line transmission signal detection output 13 It is easy to finely control the output condition of.

(3) In the embodiment, the transmission processing circuit 5 and the subsequent parts in the data processing device 2 are explained as a single layer, but even if the transmission processing circuit and the subsequent parts are duplicated, the present invention can be applied. The non-selection-side transmission path transmission signal detection circuit 9 is provided, and the non-selection-side transmission path transmission signal detection output 13, which is the output of the non-selection-side transmission path transmission signal detection circuit 9, is input to the controller that processes the transmission data. Thus, the transmission data on the normal transmission path can be selected and used.

[0032]

As described above, according to the present invention, in a data processing device having a multiplexed transmission line, the state of the non-selected transmission line is constantly monitored so that the selected transmission line fails. In this case, the failure can be detected early and the transmission path can be switched to the normal system, so that it is possible to minimize the transmission congestion due to the transmission path failure.

[Brief description of drawings]

FIG. 1 is a data processing device including a multiplexed transmission path switching device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a non-selected side transmission line transmission signal detection circuit of FIG.

FIG. 3 is a time chart showing the operation of FIG.

FIG. 4 is a data processing device including a multiplexing transmission path switching device showing a conventional example.

[Explanation of symbols]

 1A Transmission line I system 1B Transmission line II system 2 Data processing device 3A1 I system receiver 3A2 I system transceiver 3B1 II system receiver 3B2 II system transceiver 4 Multiplexed transmission line switching device 5 Transmission processing circuit 6 Transmission control circuit 7 Selected transmission line switching signal generation circuit 8a Transmission line switching switch 9 Non-selected side transmission line transmission signal detection circuit

Claims (2)

[Claims] 1. A multiplex transmission line switching device for selecting and switching received data from any one of the multiplex transmission lines of a data processing device for transmitting / receiving data via the multiplex transmission line. In (1), when the input of the reception data from the selected transmission line is interrupted and the state of inputting the reception data from the non-selected transmission line continues for a predetermined time, a means for judging an abnormality of the selected transmission line is provided. A multiplexing transmission line switching device, comprising: means for switching to a normal transmission path according to the determination of a transmission path abnormality by this means. 2. A transmission / reception means is provided corresponding to each of the duplicated transmission paths, and the transmission / reception means receives data from any one of transmission data received from the transmission path. In a multiplexing transmission line switching device of a data processing device for switching to received data and inputting to a transmission processing circuit as a transmission signal on a selected side to perform data processing, a transmission line selected from the transmission line selected by the switching signal A transmission line changeover switch composed of two switches for alternately inputting a transmission signal and switching the transmission line from the non-selected transmission line to the non-selected side transmission line, and this transmission line changeover switch. The selected-side transmission path transmission signal is input and the non-selected-side transmission path transmission signal is input, and the selected-side transmission path transmission signal is interrupted and unselected. A non-selected side transmission line transmission signal detection circuit that outputs a non-selection side transmission line transmission signal detection output when the state of inputting a transmission line transmission signal continues for a certain period of time Multiplexed transmission line switching device, comprising a selective transmission line switching signal generation circuit that outputs a switching signal to the transmission line switching switch so as to input received data from another transmission line.