JP2020061683A - Transmission system, transmission device, and transmission method - Google Patents

Abstract

To suppress communication interruption due to an occurrence of a failure in a transmission device on a transmitting side in a transmission system with redundant communication lines.SOLUTION: A transmission device on a transmission side comprises: an order identifier adding unit for adding an order identifier indicating a transmission order to each frame of an input signal; a transmission signal transfer unit for transmitting an own system transmission signal in which the order identifier is added to the input signal to a transmission side transmission device of another system; a transmission signal selection unit for selecting any one transmission signal of the own system transmission signal and another system transmission signal received from the transmission side transmission device of the another system; a transmission unit for transmitting the transmission signal selected by the transmission signal selection unit to a communication line of its own system; and a control unit for controlling the transmission signal selection unit to set transmission signal selection setting according to a failure content of the transmission side transmission device of the own system or another system.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmission system, a transmission device and a transmission method.

  Conventionally, there is known a transmission system in which a communication line is duplicated. (For example, refer to Patent Document 1). In the conventional transmission system, one transmission side transmission device transmits the same transmission signal to each of the working and standby communication lines. When a failure occurs in the working communication line, the one receiving-side transmission device switches the received signal output from the own device from the received signal of the working communication line to the received signal of the standby communication line.

Japanese Patent No. 6290123

  In the above-mentioned conventional transmission system, when a failure occurs in the working communication line, the reception signal of the working communication line is switched to the reception signal of the protection communication line to prevent communication interruption in the transmission system. You can However, if a failure occurs in the transmission-side transmission device, communication may be interrupted in the transmission system during the period during which the transmission-side transmission device is replaced or repaired.

  The present invention has been made in view of such circumstances, and an object thereof is to suppress communication disconnection due to failure occurrence of a transmission device on a transmission side in a transmission system in which communication lines are redundant. is there.

(1) According to one aspect of the present invention, in a transmission system in which communication lines are made redundant, a transmission-side transmission device and a reception-side transmission device provided corresponding to each of the communication lines are provided, and each transmission-side transmission device is provided. The same input signal is input to the transmission side transmission device, and the transmission side transmission device adds an order identifier indicating a transmission order to each frame of the input signal, and a transmission unit that adds the order identifier to the input signal. Any one of a transmission signal transfer unit that transmits a system transmission signal to the transmission-side transmission device of another system, the own-system transmission signal, and the other-system transmission signal received from the transmission-side transmission device of the other system. A transmission signal selecting unit that selects the transmission signal of the transmission signal, a transmission unit that transmits the transmission signal selected by the transmission signal selecting unit to the communication line of the own system, and a failure of the transmission side transmission device of the own system or another system Transmission signal according to contents And a control unit for performing selective setting on the transmission signal selection unit, wherein the reception-side transmission device transmits an own-system reception signal received from the communication line of the own system to the reception-side transmission device of another system. The signal transfer unit, the self-system reception so as to eliminate the frame reception time difference between the self-system reception signal and the other-system reception signal received from the reception side transmission device of the other system based on each of the sequence identifiers. A delay addition unit for delaying a signal or the reception signal of the other system, a reception signal of one system in a non-faulty state among the reception signal of the own system and the reception signal of the other system output from the delay addition unit, A transmission system comprising: a reception signal selection unit to be selected; and a reception signal output unit to output the reception signal selected by the reception signal selection unit.
(2) In one aspect of the present invention, the transmission-side transmission device receives a video input signal and adds the sequence identifier to each frame of the input signal; A switch that receives the other system transmission signal and outputs one of the transmission signals, a first line interface that transmits the transmission signal output from the switch to the communication line of the own system, and the own system transmission signal And a second line interface for transmitting to the transmitting device of the other system.

(3) One aspect of the present invention is, in a transmitting side transmission device connected to one of the redundant communication lines, a sequence identifier for adding a sequence identifier indicating a transmission sequence to each frame of an input signal. An addition unit; a transmission signal transfer unit that transmits the own system transmission signal in which the order identifier is added to the input signal to the transmission side transmission device of another system; the own system transmission signal and the other system transmission side A transmission signal selection unit that selects one of the transmission signals of the other system received from the transmission device, and a transmission that transmits the transmission signal selected by the transmission signal selection unit to the communication line of the own system. And a control unit for performing a transmission signal selection setting on the transmission signal selection unit according to a failure content of the transmission-side transmission device of its own system or another system.

(4) One aspect of the present invention is a transmission method of a transmission system in which a communication line is made redundant, comprising a transmission side transmission device and a reception side transmission device provided corresponding to each of the communication lines. The same input signal is input to the transmission-side transmission device, the transmission-side transmission device adds an order identifier indicating a transmission order to each frame of the input signal, and the transmission-side transmission device, A transmission signal transfer step of transmitting a self-system transmission signal in which the order identifier is added to the input signal to the transmission-side transmission device of another system; and the transmission-side transmission device of the self-system transmission signal and the other system. A transmission signal selection step of selecting any one transmission signal from the other system transmission signals received from the transmission side transmission apparatus, and the transmission signal selected by the transmission side transmission apparatus in the transmission signal selection step. A transmission step of transmitting to the communication line of the own system, and the transmission side transmission device performs transmission signal selection setting in the transmission signal selection step according to the failure content of the transmission side transmission device of the own system or another system. A control step; a reception signal transfer step in which the reception-side transmission device transmits the self-system reception signal received from the communication line of the self-system to the reception-side transmission device of another system; and the reception-side transmission device includes: The self-system reception signal or the other-system reception so as to eliminate a frame reception time difference between the self-system reception signal and the other-system reception signal received from the reception side transmission device of the other system based on each of the sequence identifiers. A delay adding step of delaying a signal, and the receiving-side transmission device receiving a reception signal of one system in the non-faulty state among the own system reception signal and the other system reception signal output from the delay adding step. A reception signal selection step of selecting, the receiving-side transmission apparatus, a transmission method comprising: a reception signal outputting step of outputting a reception signal that the reception signal selection step selects.

  According to the present invention, in a transmission system in which a communication line is made redundant, it is possible to obtain an effect of suppressing a communication disconnection due to the occurrence of a failure in the transmission device on the transmission side.

It is a block diagram showing an example of composition of a video transmission system concerning one embodiment. It is an explanatory view for explaining an example of a transmission method concerning one embodiment. It is an explanatory view for explaining an example of a transmission method concerning one embodiment. It is an explanatory view for explaining an example of a transmission method concerning one embodiment. It is an explanatory view for explaining an example of a transmission method concerning one embodiment. It is an explanatory view for explaining an example of a transmission method concerning one embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiments described below, a video transmission system that transmits a video signal will be described as an example of the transmission system.

  FIG. 1 is a block diagram showing a configuration example of a video transmission system according to an embodiment. The video transmission system 1 includes matrix routers (Matrix Routers) 3 and 5, transmission side transmission devices NAU-AS and NAU-BS, and reception side transmission devices NAU-AR and NAU-BR. The communication line used by the video transmission system 1 is made redundant. In the example of FIG. 1, the video transmission system 1 uses the duplicated communication lines A and B.

  The transmission device NAU-AS and the reception device NAU-AR of the A system are provided corresponding to the communication line A. The B-side transmission side transmission device NAU-BS and the reception side transmission device NAU-BR are provided corresponding to the communication line B.

  In the following description, “A system transmission side transmission device (A system transmission side transmission device) NAU-AS and B system transmission side transmission device (B system transmission side transmission device) NAU-BS are not particularly distinguished. The transmission device NAU-S on the transmission side. When the A-side receiving side transmission device (A-type receiving side transmitting device) NAU-AR and the B-type receiving side transmitting device (B-type receiving side transmitting device) NAU-BR are not particularly distinguished, "reception-side transmission" Device NAU-R ". Further, for the A system, the self system is the A system and the other system is the B system. For the B system, the self system is the B system, and the other system is the A system. The communication line A is an A-system communication line (A-system communication line). The communication line B is a B-system communication line (B-system communication line).

  The input video signal Vin is input to the matrix router 3 on the transmission side. The input video signal Vin is a transmission frame format signal and is a signal composed of a plurality of transmission frames. A signal such as an image coded signal of an image coding method such as MPEG is stored in the transmission frame.

  The matrix router 3 transmits the input video signal Vin to both the A-system transmission side transmission device NAU-AS and the B-system transmission side transmission device NAU-BS.

  The matrix router 5 receives the output signals of the A-system reception side transmission device NAU-AR and the B-system reception side transmission device NAU-BR. The matrix router 5 outputs the output signal output from the receiving transmission device NAU-R of one system which is in the non-faulty state among the A receiving system NAU-AR and the B receiving system NAU-BR. It is selected and output as the output video signal Vout.

[Transmitting device]
The same input video signal Vin is input from the matrix router 3 to the A-system transmission side transmission device NAU-AS and the B-system transmission side transmission device NAU-BS. The A-system transmission side transmission device NAU-AS and the B-system transmission side transmission device NAU-BS have the same configuration.

  The transmission-side transmission device NAU-S includes a video interface 11, a sequence identifier adding unit 12, a switch 13, a line interface 14, and a control unit 15.

  The video interface 11 receives the input video signal Vin from the matrix router 3. The video interface 11 transmits the received input video signal Vin to the order identifier adding unit 12.

  The sequence identifier adding unit 12 adds a sequence identifier to each transmission frame included in the input video signal Vin received from the video interface 11. The sequence identifier is an identifier indicating the transmission sequence of transmission frames. The sequence identifier adding unit 12 outputs to the switch 13 a signal obtained by adding a sequence identifier to the input video signal Vin (hereinafter, referred to as a self-system transmission signal). The own system transmission signal is input to the input port P1 of the switch 13. The video interface 11 may include the order identifier adding unit 12.

  The switch 13 includes input ports P1 and P4 and output ports P2 and P3. The switch 13 arbitrarily switches the connection between the input ports P1 and P4 and the output ports P2 and P3. The switch 13 connects between the input ports P1 and P4 and the output ports P2 and P3 according to the setting (transmission signal selection setting) from the control unit 15. The input port P1 of the switch 13 is connected to the output port of the order identifier adding unit 12. The input port P4 of the switch 13 is connected to the device-side output port of the line L2 of the line interface 14. The output port P2 of the switch 13 is connected to the device-side input port of the line L1 of the line interface 14. The output port P3 of the switch 13 is connected to the device-side input port of the line L2 of the line interface 14.

  The line interface 14 includes lines L1 and L2. The line L1 of the line interface 14 transmits the transmission signal output from the output port P2 of the switch 13 to the own system communication line. The line L2 of the line interface 14 transmits the signal (local transmission signal) output from the output port P3 of the switch 13 to the transmission device NAU-S of the other system. Further, the line L2 of the line interface 14 outputs the signal received from the transmission-side transmission device NAU-S of the other system (transmission signal of the other system) to the input port P4 of the switch 13.

  The control unit 15 controls each unit of the transmission device NAU-S on the transmission side. The control unit 15 sets the transmission signal selection setting according to the failure content of the transmission side transmission device NAU-S of its own system or another system in the switch 13.

  The switch 13 is set to connect between ports so that the output port P3 fixedly outputs the own system transmission signal input to the input port P1. On the other hand, for the output port P2, the output port P2 outputs either one of the own system transmission signal input to the input port P1 and the other system transmission signal input to the input port P4. The transmission signal selection setting is performed from the control unit 15 to the switch 13.

  In the present embodiment, the switch 13 of the transmission device NAU-S on the transmission side corresponds to a transmission signal selection unit. The line L1 of the line interface 14 of the transmission device NAU-S on the transmission side corresponds to the transmission unit. The line L2 of the line interface 14 of the transmission device NAU-S on the transmission side corresponds to the transmission signal transfer unit.

[Reception side transmission device]
The A-system reception side transmission device NAU-AR receives the transmission signal transmitted from the A-system transmission side transmission device NAU-AS via the A-system communication line A. The B-system receiving side transmission apparatus NAU-BR receives the transmission signal transmitted from the B-system transmitting side transmission apparatus NAU-BS via the B-system communication line B. The A-system reception side transmission device NAU-AR and the B-system reception side transmission device NAU-BR have the same configuration.

  The reception-side transmission device NAU-R includes a line interface 21, a delay adding unit 22, a switch 23, a video interface 24, and a control unit 25.

  The line interface 21 includes lines L1 and L2. The line L1 of the line interface 21 outputs the own system reception signal received from the own system communication line to the delay unit D1 of the delay adding unit 22 and the device side input port of the line L2 of the line interface 21. The line L2 of the line interface 21 transmits the own system reception signal output from the line L1 of the line interface 21 to the receiving side transmission device NAU-R of the other system. Further, the line L2 of the line interface 21 outputs the other-system reception signal received from the other-side receiving-side transmission device NAU-R to the delay unit D2 of the delay adding unit 22.

  The own system reception signal output from the line L1 of the line interface 21 is input to the delay unit D1 of the delay adding unit 22. The other-system reception signal output from the line L2 of the line interface 21 is input to the delay unit D2 of the delay adding unit 22. The delay units D1 and D2 delay the input signal and output it. The delay unit D1 delays and outputs the own system reception signal. The delay unit D2 delays and outputs the other-system reception signal. The delay amount by which the delay units D1 and D2 delay the signal may be zero (no delay).

  The delay adding unit 22 delays the own system reception signal or the other system reception signal so as to eliminate the frame reception time difference based on each sequence identifier of the own system reception signal and the other system reception signal. The delay amount of each of the delay units D1 and D2 is determined from the transmission time difference detected based on the frame reception time difference between the own transmission frame and the other transmission frame to which the same order identifier is added. For example, when the transmission time of the own system is longer than the transmission time of the other system by the time Td, the delay amount of the delay unit D2 is delayed by the time Td more than the delay amount of the delay unit D1 in order to delay the reception signal of the other system by the time Td. Just do more.

  The own system reception signal output from the delay unit D1 of the delay adding unit 22 is input to the input port P11 of the switch 23. The other-system reception signal output from the delay unit D2 of the delay adding unit 22 is input to the input port P12 of the switch 23.

  The switch 23 includes input ports P11 and P12 and an output port P13. The switch 23 arbitrarily switches the connection between the input ports P11, P12 and the output port P13. The switch 23 connects between the input ports P11 and P12 and the output port P13 according to the setting (reception signal selection setting) from the control unit 25. The input port P11 of the switch 23 is connected to the output port of the delay unit D1 of the delay adding unit 22. The input port P12 of the switch 23 is connected to the output port of the delay unit D2 of the delay adding unit 22. The output port P13 of the switch 23 is connected to the input port of the video interface 24.

  The video interface 24 outputs the reception signal output from the output port P13 of the switch 23. The received signal output from the video interface 24 is input to the matrix router 5. The matrix router 5 receives the reception signal output from the reception side transmission device NAU-R of the one system which is in the non-fault state of the A side reception side transmission device NAU-AR and the B system reception side transmission device NAU-BR. It is selected and output as the output video signal Vout.

  The control unit 25 controls each unit of the reception-side transmission device NAU-R. The control unit 25 sets the reception signal selection setting for selecting the reception signal of the one system in the non-fault state to the switch 23.

  In the present embodiment, the switch 23 of the reception-side transmission device NAU-R corresponds to the reception signal selection unit. The line L2 of the line interface 21 of the reception-side transmission device NAU-R corresponds to the reception signal transfer unit. The video interface 24 of the reception-side transmission device NAU-R corresponds to the reception signal output unit.

[Transmission method]
The transmission method according to this embodiment will be described with reference to FIGS. 2 to 6. 2 to 6 are explanatory diagrams for explaining an example of the transmission method according to the present embodiment. 2 to 6 show five system selection positions sel1 to sel5. The system selection positions sel1 to sel5 are positions for selecting a signal of one of the A system and the B system.

  The system selection position sel1 corresponds to selection of a signal to be output from the output port P2 of the switch 13 of the A-system transmission apparatus NAU-AS. At the system selection position sel1, in the switch 13 of the A-side transmission device NAU-AS, a transmission signal output from the output port P2 (a transmission signal transmitted to the A-system communication line A) is input to the input port P1. One of the transmission signals is selected from the own system transmission signal (A system transmission signal) and the other system transmission signal (B system transmission signal) input to the input port P4.

  The system selection position sel2 corresponds to selection of a signal to be output from the output port P2 of the switch 13 of the B-system transmission apparatus NAU-BS. At the system selection position sel2, in the switch 13 of the B-system transmission device NAU-BS, a transmission signal output from the output port P2 (a transmission signal transmitted to the B-system communication line B) is input to the input port P1. One of the transmission signals is selected from the own system transmission signal (B system transmission signal) and the other system transmission signal (A system transmission signal) input to the input port P4.

  The system selection position sel3 corresponds to selection of a signal output from the output port P13 of the switch 23 of the A-system reception side transmission device NAU-AR. At the system selection position sel3, in the switch 23 of the A-system reception side transmission device NAU-AR, as a reception signal output from the output port P13 (a reception signal output to the matrix router 5), the own system input to the input port P11. From the received signal (A system received signal) and the other system received signal input to the input port P12 (B system received signal), the received signal of the one system in the non-fault state is selected.

  The system selection position sel4 corresponds to selection of a signal output from the output port P13 of the switch 23 of the B-system reception side transmission device NAU-BR. At the system selection position sel4, in the switch 23 of the B-system reception side transmission device NAU-BR, the own system input to the input port P11 as the reception signal output from the output port P13 (the reception signal output to the matrix router 5). From the received signal (B system received signal) and the other system received signal input to the input port P12 (A system received signal), the received signal of the one system in the non-fault state is selected.

  The system selection position sel5 corresponds to the selection of the output video signal Vout output from the matrix router 5. At the system selection position sel5, an output signal output from the receiving-side transmitting device NAU-R of the one system, which is in the non-fault state, of the A-receiving device NAU-AR and the B-receiving device NAU-BR. To output as the output video signal Vout.

(Example 1 of transmission method; example when failure occurs in video interface of transmission device on transmission side)
A first example of the transmission method will be described with reference to FIGS. 2 to 4. Example 1 of the transmission method is an example in which a failure occurs in the video interface 11 of the transmission device NAU-S on the transmission side.

  First, the state shown in FIG. 2 is a state in which no failure has occurred. In FIG. 2, at the system selection positions sel1 and sel2, the A system transmission signal is selected. Further, at the system selection positions sel3 and sel4, the A system reception signal is selected. At the system selection position sel5, the A-system reception side transmission device NAU-AR is selected. In the state shown in FIG. 2, the input video signal Vin is transmitted as an A-system transmission signal from each transmission-side transmission device NAU-S to each reception-side transmission device NAU-R via each communication line A, B, and A The A system reception signal received by the system reception side transmission device NAU-AR is output from the matrix router 5 as an output video signal Vout.

  Then, as shown in FIG. 3, a failure occurs in the video interface 11 of the transmission device NAU-AS on the A side. Due to this fault, the A system transmission signal transmitted via each communication line A, B becomes abnormal, and both the A system reception signal and the B system reception signal become abnormal. Therefore, the system selection positions sel3 and sel4 Then, the selection value becomes undefined. As a result, the normal output video signal Vout is not output from the matrix router 5.

  Next, in FIG. 4, when a failure occurrence in the video interface 11 of the transmission device NAU-AS on the A side is detected, the control unit 15 of each transmission device NAU-S on the transmission side transmits the B system to the switch 13. The transmission signal selection setting is performed so that the signal is selected. By this transmission signal selection setting, the B system transmission signal is selected at the system selection positions sel1 and sel2. As a result, when the B-system transmission signal is transmitted via each of the communication lines A and B, both the A-system reception signal and the B-system reception signal become normal, and as an example here, the system selection position sel3 and In sel4, the B system reception signal is selected. As a result, the B-system reception signal is output from the matrix router 5 as a normal output video signal Vout.

  An alarm signal notifying that a failure has occurred in the video interface 11 is output from the video interface 11 to the control unit 15 of each system. In response to the alarm signal, the control unit 15 sets the switch 13 so that the switch 13 selects the B-system transmission signal.

  In the example 1 of the transmission method described above, the case where the video interface 11 of the transmission device NAU-S of the transmission system A of the A system as the active system has failed is described, but the transmission of the transmission system of the B system as the active system is performed. Similarly, when a failure occurs in the video interface 11 of the apparatus NAU-S, the transmission signal selection setting may be performed on the switch 13 so as to select the transmission signal of the A system which is the backup system.

  According to the example 1 of the transmission method described above, when a failure occurs in the video interface 11 of the transmission device NAU-S of the active system, the transmission signal of the backup system is transmitted from the transmission device NAU-S of each system. It is possible to transmit to the receiving side transmission device NAU-R of each system via each communication line A, B. As a result, it is possible to suppress communication interruption due to the occurrence of a failure in the transmission side transmission device NAU-S.

  An alarm signal for notifying the failure of the video interface 11 is output to the terminal of the maintenance person of the video transmission system 1, and the control section 15 transmits the standby system to the switch 13 by the terminal operation of the maintenance person. The transmission signal selection setting may be performed so as to select the signal. Even in this case, since the transmission signal selection setting can be performed by communication, the maintenance person does not have to go to the site to replace or repair the video interface 11 of the transmission device NAU-S. It is possible to restore normal video signal transmission in a relatively short period of time.

(Example 2 of transmission method; example when failure occurs in line interface of transmission device on transmission side)
A second example of the transmission method will be described with reference to FIGS. Example 2 of the transmission method is an example in which a failure occurs in the line L1 (the interface that outputs a transmission signal to the own system communication line) of the line interface 14 of the transmission device NAU-S on the transmission side.

  First, the state shown in FIG. 5 is a state in which no failure has occurred. In FIG. 5, at the system selection positions sel1 and sel2, the B system transmission signal is selected. Further, at the system selection positions sel3 and sel4, the B system reception signal is selected. At the system selection position sel5, the A-system reception side transmission device NAU-AR is selected. In the state shown in FIG. 5, the input video signal Vin is transmitted as a B transmission signal from each transmission side transmission device NAU-S to each reception side transmission device NAU-R via each communication line A, B, and A The B system reception signal received by the system reception side transmission device NAU-AR is output from the matrix router 5 as an output video signal Vout.

  Then, as shown in FIG. 6, a failure occurs in the line L1 of the line interface 14 of the B-side transmission apparatus NAU-BS. Due to this failure, normal transmission is not performed to the B-system communication line B, and the B-system reception signal received via the B-system communication line B becomes abnormal. Therefore, the system selection positions sel3 and sel4 are not The A system reception signal in the fault state is selected. As a result, the input video signal Vin is transmitted as a B system transmission signal from the A system transmission side transmission device NAU-AS to the A system reception side transmission device NAU-AR via the A system communication line A, and the A system reception side transmission device. The A-system reception signal received by the NAU-AR is output from the matrix router 5 as a normal output video signal Vout.

  In the example 2 of the transmission method described above, the case where a failure occurs in the line L1 of the line interface 14 of the transmission side transmission device NAU-S of the B system as the active system is taken as an example, but the active system of the A system is used. Similarly, when a failure occurs in the line L1 of the line interface 14 of the transmission side transmission device NAU-S, the active system A transmission signal is similarly transmitted from the standby system B system transmission side transmission device NAU-BS to the standby system B system. It is possible to transmit to the B-system reception side transmission device NAU-BR of the standby system via the communication line B.

  According to the example 2 of the transmission method described above, when a failure occurs in the line L1 of the line interface 14 of the transmission device NAU-S of the active system, the transmission signal of the active system is transmitted to the transmission device NAU of the standby system. -S can be transmitted to the reception side transmission device NAU-R of the standby system via the communication line of the standby system. As a result, it is possible to suppress communication interruption due to the occurrence of a failure in the transmission side transmission device NAU-S.

  As described above, according to the present embodiment, in the video transmission system 1 in which the communication line is made redundant, it is possible to obtain the effect of suppressing the communication interruption due to the failure occurrence of the transmission side transmission device NAU-S. This can contribute to providing stable video transmission in an international video transmission service, for example.

  Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and includes design changes and the like within a range not departing from the gist of the present invention.

  Although the above-described embodiment is applied to the transmission system in which the communication lines are duplicated, it may be applied to the transmission system in which the communication lines are redundant more than tripled.

  Further, in the above-described embodiment, the invention is applied to the video transmission system for transmitting the video signal, but it may be applied to the transmission system for transmitting the signal of a type other than the video signal.

DESCRIPTION OF SYMBOLS 1 ... Video transmission system, 3, 5 ... Matrix router, 11, 24 ... Video interface, 12 ... Sequence identifier addition part, 13, 23 ... Switch, 14, 21 ... Line interface, 15, 25 ... Control part, 22 ... Delay Addition unit, A, B ... Communication line, NAU-AS, NAU-BS ... Transmitting side transmission device, NAU-AR, NAU-BR ... Receiving side transmission device

Claims (4)

In a transmission system with redundant communication lines,
A transmitter transmission device and a receiver transmission device provided corresponding to each of the communication lines;
The same input signal is input to each of the transmitting side transmission devices,
The transmission device on the transmission side,
An order identifier adding unit that adds an order identifier indicating a transmission order to each frame of the input signal,
A transmission signal transfer unit for transmitting the own system transmission signal in which the order identifier is added to the input signal to the transmission side transmission device of another system;
A transmission signal selection unit that selects one of the transmission signals of the own transmission signal and the other transmission signal received from the transmission device of the other transmission system,
A transmission unit that transmits the transmission signal selected by the transmission signal selection unit to the communication line of its own system;
A control unit for performing transmission signal selection setting on the transmission signal selection unit according to a failure content of the transmission-side transmission device of its own system or another system,
The receiving side transmission device,
A reception signal transfer unit for transmitting the own system reception signal received from the communication line of the own system to the reception side transmission device of another system;
The own system reception signal or the other system so as to eliminate a frame reception time difference based on each of the sequence identifiers of the own system reception signal and the other system reception signal received from the receiving side transmission device of the other system. A delay adding unit for delaying the received signal,
A reception signal selection unit that selects a reception signal of one system that is in a non-faulty state among the own system reception signal and the other system reception signal output from the delay adding unit,
A reception signal output unit that outputs the reception signal selected by the reception signal selection unit,
Transmission system. The transmission device on the transmission side,
A video interface for receiving the input signal of video and adding the sequence identifier to each frame of the input signal;
A switch that receives the own system transmission signal and the other system transmission signal and outputs one of the transmission signals,
A first line interface for transmitting a transmission signal output from the switch to the communication line of its own system;
A second line interface for transmitting the own system transmission signal to the transmission side transmission device of another system,
The transmission system according to claim 1. In a transmitting side transmission device connected to one of the redundant communication lines,
An order identifier adding unit that adds an order identifier indicating a transmission order to each frame of the input signal,
A transmission signal transfer unit for transmitting the own system transmission signal in which the order identifier is added to the input signal to the transmission side transmission device of another system;
A transmission signal selection unit that selects one of the transmission signals of the own transmission signal and the other transmission signal received from the transmission device of the other transmission system,
A transmission unit that transmits the transmission signal selected by the transmission signal selection unit to the communication line of its own system;
A control unit for performing a transmission signal selection setting in the transmission signal selection unit according to a failure content of the transmission side transmission device of its own system or another system;
A transmission device including. A transmission method of a transmission system in which a communication line is redundant,
A transmitter transmission device and a receiver transmission device provided corresponding to each of the communication lines;
The same input signal is input to each of the transmitting side transmission devices,
The transmission device, the order identifier adding step of adding an order identifier indicating a transmission order to each frame of the input signal,
A transmission signal transfer step in which the transmission-side transmission device transmits the own-system transmission signal in which the order identifier is added to the input signal to the transmission-side transmission device of another system;
The transmission side transmission device, a transmission signal selection step of selecting any one transmission signal from the own system transmission signal and the other system transmission signal received from the transmission system transmission device of the other system,
A transmission step in which the transmission-side transmission device transmits the transmission signal selected by the transmission signal selection step to the communication line of its own system;
A control step in which the transmission-side transmission device performs transmission signal selection setting in the transmission-signal selection step according to a failure content of the transmission-side transmission device of its own system or another system;
A reception signal transfer step in which the reception-side transmission device transmits the self-system reception signal received from the communication line of the self-system to the reception-side transmission device of another system;
The receiving-side transmission device cancels the frame reception time difference between the own-system reception signal and the other-system reception signal received from the other-system reception-side transmission device based on the sequence identifier. Delay adding step of delaying the system reception signal or the other system reception signal,
The reception side transmission device, a reception signal selection step of selecting a reception signal of one system in a non-faulty state among the own system reception signal and the other system reception signal output from the delay adding step,
The reception side transmission device, a reception signal output step of outputting the reception signal selected by the reception signal selection step,
Transmission method including.

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