JPH04253432A - Dual system for switch board - Google Patents

Abstract

PURPOSE:To duplicate a switch board and to enable backup with the other switch board even when a defect is generated at one switch board concerning the switch board used for various data transmitters so as to execute switching control to the input/output routes of data. CONSTITUTION:This system is equipped with an input/output data switching part 101, error detection part 102 to detect the error of data outputted from the input/output data switching part 101, protection circuit 103 to receive an error signal outputted from the error detection part 102 and to output an error decision signal when error is decided, and this system is composed of plural switch boards 104, which are mutually parallelly connected, and monitor part to output a switch board switching signal for making effective one of the plural switch boards 104 corresponding to the error decision signals outputted from the respective protection circuits 103 of these plural switch boards 104.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch panel used in various data transmission devices to control switching of data input/output paths.

0002

2. Description of the Related Art Generally, a data transmission device is provided with a switch panel that receives data transmitted within its own station and data received from other stations as input data, and selects and outputs data in accordance with switching instructions. The data input/output route is controlled by the panel.

[0003]In recent years, with the development of a highly information-oriented society, high reliability and safety are required for switching control of data input/output paths in diversifying data transmission devices. With conventional data transmission equipment, duplication has become necessary for the entire system in pursuit of such high reliability and safety, but due to implementation issues and difficulty in switching timing, it has become necessary to have redundancy in the entire system. Only the high-speed section at the top has a redundant configuration.

0004

[Problem to be Solved by the Invention] Therefore, in such conventional data transmission equipment, if a malfunction occurs in the switch board, the data that was supposed to be transmitted may loop back, or the audio data may be lost. There is a risk that the communication network will be disrupted due to the image data line being interrupted, and the entire transmission device will go down.

[0005] This invention was made in consideration of the above circumstances, and it is a duplex switch board in which the switch board is duplicated so that even if a problem occurs in one switch board, backup can be provided by another switch board. It provides equipment.

[0006]

[Means for Solving the Problems] FIG. 1 is a block diagram showing the configuration of the present invention. As shown in the figure, this invention:
An input/output data switching section 101 that uses transmission data within its own station and reception data from other stations as input data and selects and outputs data according to a switching instruction, and detects errors in output data output from the input/output data switching section 101. An error detection unit 1 outputs an error signal when an error exists.
02, and a protection circuit 103 that receives an error signal output from the error detection unit 102, counts a set number of stages, and outputs an error confirmation signal when an error is confirmed, and a plurality of circuits connected in parallel to each other. switch board 1
04 and each protection circuit 1 of these plurality of switch panels 104
Receive each error confirmation signal output from 03,
A plurality of switch panels 10 according to those error confirmation signals
This is a switch board duplication device comprising a monitoring section that outputs a switch board switching signal 105 for activating any one of the switch boards 104 among the switch boards 104.

[0007]

[Operation] According to the present invention, when an error confirmation signal is output from the protection circuit 103 of one of the plurality of switch panels 104, the monitoring unit that receives the error confirmation signal responds to the error confirmation signal. The switch board 104 is switched.

Therefore, even if a malfunction occurs in one switch panel 104, the switch can be immediately switched to another switch panel 104, so there is no confusion in the data path, and the entire system of the data transmission equipment due to a malfunction in the switch panel 104 is eliminated. Down is prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on embodiments shown in the drawings. Note that this invention is not limited to this.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. In this figure, VS is a video data output unit that outputs video data as transmission data within its own station and data received from other stations, SW1 and SW2 are switch boards, and MUX is a switch board SW1 and a switch board SW.
This is a multiplexer that multiplexes video data output from one of the switch panels 2 and 2 with video data output from the other system.

[0011] The switch board SW1 and the switch board SW2 are connected in parallel to each other, and each switch board SW1,
Each SW2 has an input/output data switching section 3, an error detection section 4, and a protection circuit 5.

The input/output data switching section 3 receives video data as transmission data within its own station or reception data from other stations from the video data output section VS, and selects the data according to a switching instruction from a control section (not shown). and output it.

The error detection section 4 detects errors in the output data output from the input/output data switching section 3, and outputs an error signal if an error exists. Error detection section 4
Error detection methods include parity error detection, which detects errors based on odd or even parity, and CR, which detects errors by dividing data by a generator polynomial.
C error detection, or zero or one series detection, which detects errors based on whether the same data continues for a certain period of time, is used.

The protection circuit 5 receives the error signal output from the error detection section 4, counts the set number of stages, and outputs an error confirmation signal when the error is confirmed.

Protection circuits 5 for switch panels SW1 and SW2
The error confirmation signals outputted from each are received by a monitoring section (not shown), and the monitoring section activates one of the switch panels SW1 and SW2 according to the error confirmation signals. A switch panel switching instruction signal is output, and the switch panels SW1 and SW2 are switched by this switching instruction signal.

This switching is performed by configuring a wired-or circuit in each switch board switching section 6 and using a switching instruction signal from the monitoring section as an enable signal for the output buffer.

As described above, in the switch panel duplication device of the present invention, errors in the output data output from the input/output data switching section 3 are constantly detected by the error detection section 4, and error confirmation is also protected. The reliability of error detection is ensured by providing the number of stages.

Furthermore, switching of the switch panels SW1 and SW2 is performed by a switching instruction signal from a monitoring section that has received an error confirmation signal. Therefore, even if a failure occurs in one switch panel SW1, switching to the other switch panel SW2 is quickly performed, and stable data transmission is possible.

FIG. 3 is a block diagram showing the configuration of another embodiment of the present invention. In the figure, the same components as in the previous embodiment described in FIG. 2 are designated by the same reference numerals.

In this embodiment, the basic configuration and basic operation are the same as those in the previous embodiment, but the difference from the previous embodiment is the switching portion of the switch panels SW1 and SW2. That is, in the above embodiment,
Switching between the switch boards SW1 and SW2 is performed by the enable signal of the output buffer, but in this embodiment, the selector for switching between the switch boards SW1 and SW2 is provided in the multiplexer MUX, and the switch board is controlled by the multiplexer MUX. SW1 and SW2 are switched. In this case, the select signal sent to the selector also uses the switching instruction signal from the monitoring section.

An example of application of the switch panel duplication device according to the present invention will be shown below. FIG. 4 shows an example applied to a video transmission device.

In the figure, 11 is a video transmission device, 12 is a receiving section, and 13 is a transmitting section. The receiving unit 12 includes an optical receiver 14 that receives optical signals and converts them into electrical signals, a demultiplexer DMUX that separates multiplexed data, a switch board 15 that switches data paths, and a switch board 15 that receives video data and displays images on a television or the like. It is comprised of a video data receiving section VR that displays a video data, and an audio data receiving section AR that receives audio data and generates sound through a speaker or the like.

The transmitter 13 also includes an optical transmitter 16 that converts an electrical signal into an optical signal and outputs it, a multiplexer MUX that multiplexes data, a switch board 17 that switches the data route, and a switch board 17 that converts video data from a television camera or the like. It is comprised of a video data transmitter VS that receives audio data, and an audio data transmitter AS that receives audio data from a microphone or the like.

In transmitting and receiving such video data and audio data, the switch board 15 switches the data path to the demultiplexer DMUX.
It selectively outputs the data received from the video data receiving section VR, the audio data receiving section AR, or the switch board 17. Alternatively, the data received from the switch board 17 may be transmitted to the video data receiving unit VR or the audio data receiving unit A.
Output to R.

Further, the switch board 17 selectively outputs the data received from the video data transmitter VS and the audio data transmitter AS, and the data received from the switch board 15 to the multiplexer MUX. Alternatively, data received from the video data transmitter VS or the audio data transmitter AS is output to the switch board 15.

FIG. 5 is a block diagram showing the detailed connection state of the switch panels 15 and 17. As shown in this figure, the switch panels 15 and 17 shown in FIG.
It is composed of two switch boards: switch boards 21 and 22 and a switch board 23.

In the figure, VMUX is a video data multiplexer that multiplexes video data, AMUX is an audio data multiplexer that multiplexes audio data, K is a high-speed universal line, MUX1 and MU
X2 is a multiplexer that multiplexes video data and audio data, DMUX1 and DMUX2 are demultiplexers that separate multiplexed video data and audio data, VDMX is an audio data demultiplexer that separates multiplexed video data, and ADMX is an audio data demultiplexer that separates multiplexed audio data.

FIG. 6 shows the detailed configuration of the switch panels 21 and 22. As shown in this figure, the switch board 21 uses an input/output data switching section 3 to control a video data transmitting section VS such as a video camera and an audio data transmitting section A such as a microphone.
The data received from S is sent to the video data multiplexer V
It selectively outputs to MUX, audio data multiplexer AMUX, or switch board 22. Alternatively, the data received from the switch board 22 is output to the video data multiplexer VMUX or the audio data multiplexer AMUX.

Further, the switch board 22 is connected to the video data demultiplexer VD by the input/output data switching section 3.
The data received from the MX and the audio data demultiplexer VDMX is selectively output to the video data receiving section VR, the audio data receiving section AR, or the switch board 21. Alternatively, the data received from the switch board 21,
It is output to the video data receiving section VR or the audio data receiving section AR.

All data output from the input/output data switching sections 3 of the switch panels 21 and 22 are detected as having errors by the error detecting section 4, and when an error is determined, an error is detected from the protection circuit 5. A confirmation signal is output.

Next, the switch panel 23 shown in FIG.
The detailed configuration is shown in FIG. As shown in this figure, the switch board 23 uses the input/output data switching unit 3 to select the video data multiplexer VMUX, the audio data multiplexer AMUX, or the demultiplexer DM.
The data received from UX1 and DMUX2 are selectively output to multiplexers MUX1 and MUX2, video data demultiplexer VDMX, and audio data demultiplexer ADMX.

Similarly, the error detection section 4 detects an error in the data output from the input/output data switching section 3 of the switch board 23, and when the error is confirmed, an error confirmation signal is output from the protection circuit 5. It is now possible to do so.

The switch panel duplication device of the present invention can be applied to such switch panels 21, 22, 23,
Each switch panel 21, 22, 23 is made redundant, so that even if a fault occurs in one switch panel, stable data transmission can be performed by switching to the other switch panel.

[0034] In this way, the switch board is duplicated,
If a failure occurs in one switch panel, by backing up the other switch panel, normal data transmission can be resumed immediately without bringing down the entire data transmission equipment even if a failure occurs in the switch panel. can.

[0035]

[Effects of the Invention] As described above, according to the present invention, even if a failure occurs in one switch panel, system switching can be performed quickly and stable data transmission can be performed. Further, it is possible to repair a faulty switch panel while the switched switch panel is in operation, which greatly contributes to high reliability and safety of data transmission.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 3 is a block diagram showing the configuration of another embodiment of the invention.

FIG. 4 is an explanatory diagram showing an example in which the switch panel duplexing device according to the present invention is applied to a video transmission device.

FIG. 5 is a block diagram showing a detailed connection state of the switch panel shown in FIG. 4;

FIG. 6 is an explanatory diagram showing the detailed configuration of the switch panel.

FIG. 7 is an explanatory diagram showing the detailed configuration of the switch panel.

[Explanation of symbols]

3 Input/output data switching section 4 Error detection section 5 Protection circuit 6 Switch panel switching section 11 Video transmission device 12 Receiving section 13 Transmitting section 14 Optical receiver 15, 17, 21, 22, 23, SW1, SW2 Switch panel 16 Optical transmission Machine ADMX Audio data demultiplexer AMU
X Audio data multiplexer AR Audio data receiving section AS Audio data transmitting section

Claims (1)

[Claims] 1. An input/output data switching unit (101) that receives transmission data within its own station and reception data from other stations as input data, and selects and outputs data according to a switching instruction;
An error detection section (102) that detects errors in the output data output from the input/output data switching section (101) and outputs an error signal when an error exists;
A plurality of switch panels (102) connected in parallel are each equipped with a protection circuit (103) that receives an error signal output from a set number of stages, counts a set number of stages, and outputs an error confirmation signal when an error is confirmed. 104) and each protection circuit (103) of these plurality of switch panels (104).
), and receives error confirmation signals output from the multiple switch panels (10
4) A switch panel duplication device comprising a monitoring section that outputs a switch panel switching signal (105) for activating any one of the switch panels (104).