WO2008029469A1

WO2008029469A1 - Switching system in information transmission

Info

Publication number: WO2008029469A1
Application number: PCT/JP2006/317740
Authority: WO
Inventors: Kazuki Narita; Masaaki Miura; Hiroaki Matsushima
Original assignee: Media Global Links Co., Ltd.
Priority date: 2006-09-07
Filing date: 2006-09-07
Publication date: 2008-03-13

Abstract

[PROBLEMS] A long-time transmission interruption and video disturbance occur when switching from packetized video information transmitted through a conventional duplexed transmission path formed by a currently used system and a backup system to another video information transmitted. [MEANS FOR SOLVING PROBLEMS] A switching system is formed by a transmission device and a transmission control device. The transmission device includes a first system acquisition unit for acquiring one of the duplexed information, i.e., information which is duplexed when transmitted (hereinafter, referred to as 'currently duplexed information') and a second system acquisition unit for acquiring the other of the currently duplexed information. The transmission control device switches the information transmitted to the first system acquisition unit of the transmission device to one of the duplexed information (hereinafter, referred to 'new duplexed information') and then switches the information transmitted to the second system acquisition unit of the transmission device to the other of the new duplexed information.

Description

Specification

Switching system for information transmission

Technical field

TECHNICAL FIELD [0001] The present invention relates to a switching system for minimizing disturbance of information transmission accompanying switching of information transmitted in duplicate.

Background art

[0002] Conventionally, key stations existing in big cities, etc. Video information for constructing transmitted television signals, etc. is received by local stations in local cities and produced at those local stations There is known a system for switching to the video information of the selected program (for example, see Patent Documents 1 and 2).

Patent Document 1: Japanese Patent Laid-Open No. 11-8800

Patent Document 2: Japanese Patent Laid-Open No. 2001-45371

Disclosure of the invention

Problems to be solved by the invention

However, in the techniques disclosed in Patent Documents 1 and 2, etc., it is assumed that video information is transmitted in units of frames, and video information is transmitted in units of packets. However, it is not premised on transmission via an asynchronous network such as the Internet. In addition, in the techniques disclosed in Patent Documents 1 and 2, it is assumed that the video information transmission path is duplexed using the active system and the standby system.

[0004] For this reason, when switching the video information transmitted in the form of a packet on the duplex transmission path consisting of the active system and the standby system to another transmitted video information, the transmission is interrupted for a long time. And a problem that the video is disturbed. The present invention has been conceived in order to solve a problem to be solved.

Means for solving the problem

[0005] In order to solve the problem, the following is a switching system composed of a transmission device and a transmission control device, and the transmission device is configured to transmit information that is duplicated (hereinafter referred to as this information). "Current Duplex Information" t, u) a first system acquisition unit that acquires one information, and current duplex information A second system acquisition unit that acquires other information, and the transmission control device transmits information transmitted to the first system acquisition unit of the transmission device to other duplex information (hereinafter referred to as After this information is switched to one piece of information ("new duplex information"), the information transmitted to the second system acquisition unit of the transmission device is switched to the other information of the new duplex information. Disclose the switching system.

[0006] With such a switching system, it is possible to set a time difference in switching information acquired between the first system acquisition unit and the second system acquisition unit, and to acquire information power. Can be prevented. In addition, for example, by setting the first system acquisition unit as the standby system and the second system acquisition unit as the active system, it is possible to provide a notice of switching of the active system by starting the switching of the standby system. Can do.

[0007] In addition, the transmission device selects either the first system acquisition unit or the second system acquisition unit as the acquisition unit that acquires the information to be output, and the transmission control device As the system acquisition unit, an acquisition unit that is not selected is used, and it is possible to switch from the information acquired by the acquisition unit!

[0008] With such a switching system, the standby system power is switched, which can be used as a notice of switching, and at least two acquisition units provided in the transmission apparatus are allocated to the active system and the standby system. Can be done flexibly.

[0009] In addition, after the information acquired by the first system acquisition unit has been switched to one of the new duplex information, the transmission apparatus still has the second duplex acquisition unit. During the period of acquiring other information, the acquisition unit that acquires the information to be output is changed from the second system acquisition unit to the first system acquisition unit. Yo ...

[0010] With this, switching between the active system and the standby system can be performed with one piece of new duplex information acquired by the first system acquisition unit and buffered by a predetermined amount. Can reduce the disturbance of the image.

[0011] In addition, the transmission control device switches the information transmitted to the second system acquisition unit of the transmission device to another information of the duplex information. Even after the information to be acquired is output! /.

The invention's effect [0012] According to the disclosure of the present invention, the information of the duplicated information acquired by the first system acquisition unit of the transmission apparatus is used as information transmitted by the standby system, thereby providing a notice of switching. be able to. In addition, it is possible to switch between the active system and the standby system by acquiring one piece of information of the new duplex information by the first system acquisition unit and buffering a certain amount of power. The effect that the disturbance of the image can be reduced can be obtained. Brief Description of Drawings

FIG. 1 is a diagram for explaining the operation of a switching system according to Embodiment 1 and the like

FIG. 2 is a diagram for explaining the operation of the switching system according to the first embodiment, etc.

FIG. 3 is a functional block diagram of the switching system according to the first embodiment.

FIG. 4 is an example of a state in which the information acquired by the first system acquisition unit is switched in the first embodiment.

FIG. 5 shows an example of a state in which information acquired by the second system acquisition unit is switched in the first embodiment.

FIG. 6 is a flowchart of processing in the switching system according to the first embodiment.

FIG. 7 is a diagram for explaining processing in the transmission apparatus

[FIG. 8] A diagram for explaining processing in the transmission apparatus.

FIG. 9 is a diagram for explaining processing in the transmission apparatus

[Fig. 10] Diagram explaining processing in the transmission device

FIG. 11 is a diagram for explaining processing in the transmission apparatus

FIG. 12 is a diagram for explaining processing in the transmission apparatus

FIG. 13 is a functional block diagram of the switching system according to the second embodiment.

FIG. 14 is a flowchart of processing in the switching system according to the second embodiment.

FIG. 15 is a functional block diagram of the switching system according to the third embodiment.

FIG. 16 is a flowchart of processing in the switching system according to the third embodiment.

FIG. 17 is a functional block diagram of the switching system according to the fourth embodiment.

FIG. 18 is a processing flowchart of the switching system according to the fourth embodiment.

Explanation of symbols

[0014] 300 switching system 301 Transmission equipment

302 Transmission control device

303 1st System Acquisition Department

304 Second System Acquisition Department

305 1st switching part

306 Second switching part

307 router (edge router)

308 router (edge router)

BEST MODE FOR CARRYING OUT THE INVENTION

[0015] The best mode for carrying out the present invention will be described below as an embodiment with reference to the drawings. It should be noted that the present invention is not limited to these embodiments, and can be implemented in various modes within the scope without departing from the gist thereof.

[0016] (Embodiment 1)

Embodiment 1 is a switching system composed of a transmission device and a transmission control device, and the transmission device is a piece of information that is duplicated and transmitted (hereinafter this information is referred to as “current duplex information”). A first system acquisition unit for acquiring the second information acquisition unit and a second system acquisition unit for acquiring other information of the current duplex information. The information to be transmitted is switched to one piece of other duplicated information (hereinafter this information is referred to as “new duplex information”), and then transmitted to the second system acquisition unit of the transmission equipment. A switching system for switching the information to be replaced with other information of the new duplex information will be described.

[0017] (Embodiment 1: operation, etc.)

1 and 2 are diagrams for explaining the operation of the switching system according to the first embodiment and the like. In FIGS. 1 and 2, a transmission apparatus 101 is a transmission apparatus for outputting information transmitted in a duplex manner to the outside of the system. The transmission device 102 and the transmission device 103 are transmission devices for inputting information for transmission from outside the system and transmitting the information to the transmission device 101. Information input to the transmission apparatus 102 and the transmission apparatus 103 is transmitted to the transmission apparatus 101 through a duplexed transmission path. Here, as a transmission path, SDHZSON ET (synchronous Digital Hierarcny / synchronous Optical Network) network, ΙΡ¾¾, etc. You can use various networks.

[0018] In the present embodiment, the information to be transmitted is mainly assumed to be information having real-time characteristics such as video information. Also, voice information or the like may be included. Also, text information and control information may be included. Further, the transmitted information may be packetized. A packet is a collection of data organized according to a certain rule. When a packet is transmitted, routers 104 to 109 are installed on the transmission path in order to relay the packet and form a path. In the illustrations of Fig. 1 and Fig. 2, information is relayed from router 104 to router 105 to router 106, so that one transmission path is formed and information is relayed from router 107 to router 108 to router 109. Another transmission line is formed. Thus, at least two transmission paths are formed, and information is duplicated and transmitted by using these paths. As a result, transmission reliability can be increased.

Note that, as a premise of the present embodiment, both the information input to the transmission apparatus 102 and the information input to the transmission apparatus 103 are transmitted to the transmission apparatus 101 because of the upper limit of the transmission capacity. Suppose that it never happens. That is, one of the information input to the transmission apparatus 102 and the information input to the transmission apparatus 103 is selected by a router or the like and transmitted to the transmission apparatus 101. Further, the selection is switched, and the other information is transmitted over the transmission device 101. For example, suppose that Fig. 1 shows the initial state of switching of transmitted information. In this initial state, the information input to the transmission apparatus 102 is finally transmitted to the transmission apparatus 101. On the other hand, the information input to the transmission apparatus 103 may not reach at least the router 104 and the router 107, but does not reach the transmission apparatus 101 as a result of selection. On the other hand, suppose that Fig. 2 shows the final state of switching of transmitted information. In this final state, the information input to the transmission apparatus 103 is transmitted to the transmission apparatus 101. On the other hand, the information input to the transmission apparatus 102 may reach at least the router 104 and the router 107, but does not reach the transmission apparatus 101 as a result of selection switching.

The router 106 and the router 109 that are directly connected to the transmission apparatus 101 that outputs information to be transmitted outside the system are referred to as “edge routers”. At this time, the present embodiment transmits at least from the edge router to the transmission apparatus 101 directly connected thereto. Information switching. Prior to this switching, the above-described selection switching is performed on the router that forms the transmission path reaching the edge router.

[0021] (Embodiment 1: Configuration)

FIG. 3 illustrates a functional block diagram of the switching system according to the first embodiment. The switching system 300 includes at least a transmission device 301 and a transmission control device 302. In addition, the switching system 300 may include edge generators 307 and 308, and may further include a router that forms a transmission path that reaches these edge generators. Also, a transmission device for inputting information (corresponding to the transmission devices 102 and 103 in FIGS. 1 and 2) may be included.

The transmission device 301 includes a first system acquisition unit 303 and a second system acquisition unit 304.

“First system acquisition unit” 303 acquires one piece of information transmitted in duplicate. “Duplexed information” means information transmitted via two or more transmission paths as shown in Figs. Hereinafter, “information duplicated and transmitted” will be referred to as “duplex information” for simplicity. “One information of double information” is information transmitted through one transmission path among information transmitted through at least two transmission paths of double information. Therefore, the first system acquisition unit 303 acquires one piece of information among information transmitted via at least two or more transmission paths of duplex information.

“Second system acquisition unit” 304 acquires other information of double information. That is, the second system acquisition unit 304 acquires information transmitted through a transmission path different from the information acquired by the first system acquisition unit 303.

[0025] In the state before the process of switching the transmitted information, one information of the double information and the other information acquired by the first system acquisition unit 303 and the second system acquisition unit 304 are transmitted. Different transmission paths are used, and the time to reach the transmission device 301 may not be different. However, one information of the double information acquired by the first system acquisition unit 303 and the second system acquisition unit 304 and the other information are the information transmitted by the transmission device power that is the same information source. In some cases, the duplex information is referred to as “current duplex information” in the sense of the duplex information currently being transmitted. In FIG. 3, the router enters routers 307 and 308, which are edge routers, and a solid arrow line from the router 307 and router 308 to the transmission device 301 represents the current duplex information.

The transmission control apparatus 302 includes a first switching unit 305 and a second switching unit 306. Transmission system The control device is a device that controls transmission of information from a transmission device serving as an information source to be transmitted to a transmission device that outputs information through a router. For example, it detects the occurrence of a failure on the transmission path, the time length of the interval of information transmitted by packets, etc., and when a failure occurs or the time length of the interval exceeds a predetermined value Select another transmission path to change the path through which information is transmitted. Also, at a predetermined time, the transmission device that is the information source to be transmitted is switched, and information that reaches the transmission device that outputs information to the outside of the system is also switched.

[0027] "First switching unit" 305 switches one piece of information of the duplex information transmitted to the first system acquisition unit 303 of the transmission device 301 to one piece of information of the other duplex information. For the sake of simplicity, “other duplex information” will be referred to as “new duplex information” to mean newly transmitted duplex information. In Fig. 3, each of the dashed-dotted arrow lines entering router 307 and router 308 is the new duplex information. At this time, the first switching unit 305 switches one piece of information of the duplex information transmitted to the first system obtaining unit 303 to one piece of information of the new duplex information. As a result, as shown in FIG. 4, the first system acquisition unit 303 acquires one piece of new duplex information represented by a dashed-dotted arrow line. On the other hand, the second system acquisition unit 304 continues to acquire one piece of current duplex information.

The first switching unit 305 transmits, for example, a control signal for switching to a router 307 that is an edge router that transmits information to the first system acquisition unit 303. In response to this control signal, the router 307 operates so that the information transmitted from the router 307 to the first system acquisition unit 303 becomes one information of the new duplex information from one information of the current duplex information. To do. As shown in Fig. 1 and Fig. 2, for example, when a single transmission line is formed by multiple routers 104 to 106, the information output by the edge router is the information power of the current duplex information. Prior to switching to one piece of information, the information relayed by the router on the transmission path through which one piece of information of the current duplex information is transferred is one piece of information power of the current duplex information. The first switching unit 305 may perform control so as to switch to the information.

[0029] Further, the information power that the router 307 transmits to the first system acquisition unit 303 by the first switching unit 305 sending a control signal for switching to the router 307, etc. When switching to one piece of new duplex information, obtain the first system of one piece of new duplex information Information indicating that the switching has been performed may be transmitted to the first system acquisition unit 303 immediately before transmission to the first unit. Hereinafter, a packet including information indicating that switching has been performed by the first switching unit 305 is referred to as an “F (First) marker packet”.

[0030] The "second switching unit" 306 transmits the duplex information transmitted to the second system acquisition unit 304 to the new duplex information after the information of the first system acquisition unit 303 of the transmission device 301 is switched. Switch to other information. For example, the second switching unit 306 transmits a control signal for switching to the router 308 that is an edge router that transmits information to the second system acquisition unit 304. As a result, the router 308 causes the information transmitted from the router 308 to the second system acquisition unit 304 to be the other information of the new duplex information from the other information of the current duplex information. Operate. As shown in FIGS. 1 and 2, for example, when another transmission line is formed by a plurality of routers 107 to 109, the information output from the edge router is changed to other information of the current duplex information. Prior to switching from the other information of the new duplex information to the other information of the new duplex information, the information relayed by the router on the transmission path through which the other information of the current duplex information is transmitted is the other information of the current duplex information. The second switching unit 306 may perform control so as to switch from one to the other information of the new duplex information.

[0031] In addition, the second switching unit 306 transmits a control signal for switching to the router 308, etc., so that the router 308 transmits information to the second system acquisition unit 304. When switching from information to other information of the new duplex information, information indicating that the switching has been performed immediately before transmission of the other information of the new duplex information to the second system acquisition unit. It may be transmitted to the second system acquisition unit 304. Hereinafter, a packet including information indicating that the switching has been performed by the second switching unit 306 is referred to as an “S (Second) marker packet”.

After the F marker packet is acquired by the first system acquisition unit 303 and until the S marker packet is acquired by the second system acquisition unit 304, the first system acquisition unit 303, the second system acquisition unit 304, The information acquired by will be different. Normally, the information acquired by the first system acquisition unit 303 and the second system acquisition unit 304 is different, which means that a failure has occurred in the information transmission path. There may be a configuration in which is emitted. However, after the F marker packet is acquired, the S marker packet is acquired and the information in the transmission device 301 is switched. Since the information switching operation is performed until the operation is completed, it is not considered that a failure has occurred, and an alarm or the like is not issued.

FIG. 5 illustrates the state after the operation of the second switching unit 306. That is, before the operation, as shown in FIG. 4, one information of the new duplex information is transmitted to the first system acquisition unit 303, and another information of the current duplex information is transmitted to the second system acquisition unit 304. Being transmitted. However, due to the operation of the second switching unit 310, the information power acquired by the second system acquisition unit 304 becomes another information of the new double information represented by the one-dot chain line, and the first system acquisition unit 304 It is the same as the information acquired by 303 (however, the delay time length may be different because it is transmitted via a transmission path different from the information acquired by the first system acquisition unit 303).

In the above description, for the sake of convenience, in the “first system acquisition unit”, “second system acquisition unit”, “first switching unit”, and “second switching unit”, “first” and “second” The word was used. However, if the transmission device has multiple acquisition units and the transmission control device has multiple switching units, the acquisition unit and switching unit with the words “first” and “second” are fixed. It does not have to be done. For example, among the plurality of acquisition units, the unit corresponding to the one with the longer delay time length is set as the first system acquisition unit and the first switching unit. It may be fluid.

[Embodiment 1: Flow of processing]

FIG. 6 illustrates a flowchart for explaining the flow of processing in the switching system according to the first embodiment. In step S601, the process waits until switching starts. For example, it waits until the time to switch the information to be transmitted from the information input to the first transmission device to the information input to the next transmission device arrives. When it is time to start switching, etc., the process proceeds to step S602, and the information transmitted to the first system acquisition unit is switched to one piece of new duplex information. Thereafter, the process proceeds to step S603, and the information transmitted to the second system acquisition unit is switched to other information of the new duplex information.

[0036] If the switching is not started in step S601, the process may be shifted to step S604 to determine whether or not the force at which the occurrence of the failure is detected. For example, before acquisition of the F marker packet or after acquisition of the S marker packet, the acquisition unit operating as the active system and the standby system among the first system acquisition unit 303 and the second system acquisition unit 304 acquires Information is lost Detecting whether or not the force is. If the occurrence of a failure is detected, the process proceeds to step S605. For example, if a failure in the active system is detected, the standby system among the first system acquisition unit 303 and the second system acquisition unit 304 is detected. Acquisition of the information of is started. Then, the processing is shifted to step S606, a warning that a failure has occurred is notified, and the processing returns to step S601. Alternatively, instead of immediately returning to step S601, an operator or the like may perform a recovery operation and return to step S601 after recovery. Further, the processing from step S601 force to S603 and the processing from step S604 to step S606 may be executed in parallel.

[0037] (Embodiment 1: specific example)

In the flowchart of FIG. 6, there can be various selections such as the timing when the process of step S603 is executed after the execution of the process of step S602. Therefore, a specific example of the timing will be shown using FIGS.

[0038] FIG. 7 illustrates another functional block diagram of the transmission apparatus. As illustrated in FIGS. 3 to 5, the transmission device 700 includes a first system acquisition unit 701 and a second system acquisition unit 702. It also has a selector 705. The selector 705 is a circuit that selects whether the information output from the transmission device 700 is the information acquired by the first system acquisition unit 701 or the information acquired by the second system acquisition unit 702. . The information obtained by the acquisition unit that has been selected is output by the transmission device.

In FIG. 7, the first system acquisition unit 701 and the second system acquisition unit 702 each have a buffer 703 and a nother 704. These buffers are used to absorb the difference in delay time length when information is transmitted in duplicate. For example, the information acquired by the first system acquisition unit and the second system acquisition unit is the current duplex information, and the selector 705 selects the information acquired by the second system acquisition unit 702 for output. Assume that a failure occurs in the route of information acquired by the second system acquisition unit 702, and the selection is switched to the information acquired by the second system acquisition unit 702 and the information acquired by the first system acquisition unit 701. At this time, since the transmission path is different from the information acquired by the first system acquisition unit 701 and the information acquired by the second system acquisition unit 702, there is a difference in the time length of the information arrival interval. obtain. Therefore, it is used to adjust this time length. By adjusting this length of time, As for the information to be input, the same information as when no failure has occurred can be output.

FIG. 8 illustrates a state immediately after the F marker packet is acquired by the first system acquisition unit 701. That is, the state where the process of S602 in the flowchart of FIG. 6 is started is illustrated. Since the information acquired by the first system acquisition unit 701 is switched by acquiring the F marker packet, the information currently stored in the nota 703 becomes unnecessary. Therefore, Noffer 7 03 is cleared. Even if this clearing is performed, the second system acquisition unit 702 continues to acquire other information of the current duplex information, and the selector 705 outputs the information acquired by the second system acquisition unit 702. Continue to select.

FIG. 9 exemplifies a state in which the buffer 703 is cleared after reception of the F marker packet, and one piece of information of the new duplex information is noffered. Even in this state, the processing of S603 in the flowchart of FIG. 6 has not yet started. The second system acquisition unit 702 continues to acquire other information of the current duplex information, and the selector 705 continues to select so that the information acquired by the second system acquisition unit 702 is output.

FIG. 10 shows that the selector 705 selects to output the information acquired by the first system acquisition unit 701 because one piece of information of the new duplex information is buffered in the nota 703 by a predetermined amount or more. The state of having performed is illustrated. The “predetermined amount” is, for example, the amount of information in which new duplex information is buffered in the noffer 703 and the buffer 704 and switching can be performed while minimizing information interruption. When the selector 705 changes the selection, a signal indicating that the change has been made may be output from the transmission apparatus to the transmission control apparatus.

FIG. 11 exemplifies a state immediately after the S-marker packet is acquired by the second system acquisition unit 702 after one piece of information of the new duplex information is buffered in the notifier 703 by a predetermined amount or more. . That is, the state where the process of S603 in the flowchart of FIG. 6 is started is illustrated. Since the information acquired by the second system acquisition unit 702 is switched by acquiring the S-power packet, the information currently stored in the nota 704 becomes unnecessary. So, Nofa 704 is relocated. As described above, in response to the signal that the selector 705 has changed the selection, one of the edge marker powers may be transmitted to the S marker packet, and the F marker packet also has the edge router power. It may be sent after a certain time from the time when it was sent. FIG. 12 shows a state in which, after the buffer 704 is cleared, another information of the new duplex information is acquired by the second system acquisition unit 702, and the information is buffered in the nother 704. . Adjusting the delay of the information buffered in buffer 704 relative to the information buffered in buffer 703 (e.g., information buffered in buffer 703 and information buffered in buffer 704) If the adjustment to ensure that there is a common part is completed, switching without interruption is possible.

[0045] (Embodiment 1: Main effects)

With the switching system described above, it is possible to set a time difference in switching the information acquired by the first system acquisition unit and the second system acquisition unit, and the information power to be acquired is also minimally disturbed in the reproduced video. To the limit. Further, if the information transmitted to the active system is switched after a predetermined time after the information transmitted to the standby system is switched, for example, the first system acquisition unit is changed to the standby system and the second system acquisition unit is switched. By using as the active system, it is possible to provide a notice of switching of information acquired by the second system acquisition unit that is the active system by starting to switch information acquired by the first system acquisition unit that is the standby system.

[Embodiment 2]

As Embodiment 2, the transmission device selects either the first system acquisition unit or the second system acquisition unit as the acquisition unit that acquires the information to be output, and the transmission control device A description will be given of a switching system that performs switching as the acquisition unit when it is selected as the first system acquisition unit. For example, a switching system in which a signal indicating which buffer the selector 705 has selected as described with reference to FIGS. 7 to 12 is transmitted from the transmission apparatus to the transmission control apparatus will be described.

[0047] (Embodiment 2: configuration)

FIG. 13 illustrates a functional block diagram of the switching system according to the second embodiment. As in the first embodiment, the switching system 1300 includes at least a transmission device 1301 and a transmission control device 1302.

The transmission apparatus 1301 includes a first system acquisition unit 1303, a second system acquisition unit 1304, and a selection unit 1307. In addition, the transmission control device 1302 includes a first switching unit 1305 and a second switching unit 1306. Therefore, the configuration of the switching system according to the second embodiment is the same as that of the first embodiment. The transmission device of the replacement system has a selection unit.

“Selection unit” 1307 is a unit that selects either the first system acquisition unit 1303 or the second system acquisition unit 1304 as an acquisition unit that acquires information to be output. For example, it is a part corresponding to the selector of FIGS.

[0050] In the present embodiment, the transmission control device 1302 serves as a first switching unit for a non-selected system that has not been selected by the selection unit 1307 of the transmission device 1301, and is a piece of new duplex information. Perform the process of switching between. Here, “one piece of information of new duplex information” means information that reaches the transmission apparatus first after being switched first among the information constituting the new duplex information. The “selection” refers to selection of an acquisition unit in which the selection unit 1307 acquires information to be output by the transmission device 1301.

Therefore, if the acquisition unit selected by the selection unit is called “active system” and the acquisition unit not selected is called “standby system”, in this embodiment, information is switched from the standby system. Will be.

[0052] (Embodiment 2: flow of processing)

FIG. 14 illustrates a flowchart for explaining the flow of processing in the switching system according to the second embodiment. In step S1401, it waits until the start of switching as in step S601. When switching starts, the process proceeds to step S 1402, and the acquisition unit selected by the selection unit 1307 is determined. This determination is performed, for example, when the transmission device outputs a signal indicating which acquisition unit is selected by the selection unit 1307 to the transmission control device, and the transmission control device detects this signal. In the subsequent step S1403, an unselected acquisition unit is set as the first system acquisition unit. In step S1404, as in step S602, the information transmitted to the first system acquisition unit is switched to one piece of new duplex information. Thereafter, the process proceeds to step S1405, and the information transmitted to the second system acquisition unit is switched to other information of the new duplex information as in step S603.

[0053] (Embodiment 2: Main effects)

As described above, in the second embodiment, by performing switching from the standby system that has not been selected, it is possible to provide a notice of switching, and the acquisition unit provided with at least two transmission devices is used as an active unit. It is possible to flexibly assign the system and the standby system. [Embodiment 3]

In Embodiment 3, the transmission apparatus is configured so that the information acquired by the first system acquisition unit is switched to one information of the new duplex information, and the second system acquisition unit still has other information of the current duplex information. A switching system is described in which the acquisition unit that acquires the information to be output is changed from the second system acquisition unit to the first system acquisition unit during the period during which one piece of information is acquired.

[Embodiment 3: Configuration]

FIG. 15 illustrates a functional block diagram of the switching system according to the third embodiment. As in the second embodiment, the switching system 1500 includes at least a transmission device 1501 and a transmission control device 1502.

The transmission apparatus 1501 includes a first system acquisition unit 1503, a second system acquisition unit 1504, and a selection unit 1507. The selection unit 1507 has period change means 1508. The transmission control device 1502 includes a first switching unit 1505 and a second switching unit 1506. Therefore, the configuration of the switching system according to the third embodiment is a configuration in which the selection unit of the transmission device of the switching system according to the second embodiment includes the period changing unit.

[0057] "Period changing means" 1508 is after the information acquired by the first system acquisition unit 1503 has been switched to one information of the new duplex information, and the second system acquisition unit 1504 still has the current duplex. The acquisition unit to be selected is changed from the second system acquisition unit 1504 to the first system acquisition unit 1503 during a period in which another piece of information is acquired. That is, the selection unit 1507 changes the selection from the second system acquisition unit 1504 to the first system acquisition unit 1503 after the first system acquisition unit 1503 starts acquiring one piece of information of the duplex information. Therefore, in this embodiment, the active system and the standby system are replaced after the start of acquisition of one piece of new duplex information by the standby system. In addition, after the standby system and the active system are exchanged, other information on the new duplex information is acquired.

[Embodiment 3: Process Flow]

FIG. 16 illustrates a flowchart for explaining the flow of processing in the switching system according to the third embodiment. In step S1601, it waits until switching starts as in step S1401. When switching starts, the process proceeds to step S 1602, and the acquisition unit selected by the selection unit 1507 is determined as in step S 1402. In step S1603 Then, as in step S 1403, the acquisition unit that is not selected is set as the first system acquisition unit. In step S1604, as in step S1404, the information transmitted to the first system acquisition unit is switched to one piece of new duplex information. Thereafter, in step S1605, the acquisition unit selected by selection unit 1 507 is changed from the second system acquisition unit to the first system acquisition unit. For example, wait until a predetermined amount of information is stored in the buffer of the first system acquisition unit, and then change it. In step S1606, as in step S1405, the information transmitted to the second system acquisition unit 1504 before the selection change (before step S1605) is switched to other information of the new duplex information.

[0059] (Embodiment 3: Main effects)

In this embodiment, it is possible to switch between the active system and the standby system by duplicating the new duplex information obtained by the first system acquisition unit to some extent and buffering it. Disturbance can be reduced.

[0060] (Embodiment 4)

In Embodiment 4, the transmission control device switches the information transmitted to the second system acquisition unit of the transmission device to the other information that is duplexed in the new duplex information. A switching system that outputs the information acquired by the first system acquisition unit is described below.

[0061] (Embodiment 4: Configuration)

FIG. 17 illustrates a functional block diagram of the switching system according to the fourth embodiment. The switching system 1700 has the power of the transmission device 1701 and the transmission control device 1702 at least as in the third embodiment.

The transmission device 1701 has a first system acquisition unit 1703, a second system acquisition unit 1704, and a selection unit 1707. The selection unit 1707 has period change means 1708. Also, the transmission control device 1702 includes a first switching unit 1705 and a second switching unit 1706. The second switching unit 1706 has switching means 1709 after the period has elapsed. Therefore, the configuration of the switching system according to the fourth embodiment is such that the second switching unit of the transmission control device of the switching system according to the third embodiment has the switching means after the period has elapsed.

“After-period switching means” 1709 is a period changing means of the selection unit 1707 of the transmission device 1701 The switching is performed after 1708 makes the change. “The change” refers to changing the selection of the second system acquisition unit 1704 by the selection unit 1707 to the first system acquisition unit 1703. The “switching described above” refers to switching from another information of the current duplex information to another information of the new duplex information by the second switching unit. In other words, in the present embodiment, after the second system acquisition unit 1704 is switched from the active system to the standby system, the information acquired by the second system acquisition unit 1704 is switched to other information of the new duplex information. It will be.

[0064] (Embodiment 4: flow of processing)

FIG. 18 illustrates a flowchart for explaining the processing flow of the switching system according to the fourth embodiment. In step S1801, it waits until switching is started as in step S1601. When switching starts, the process proceeds to step S 1802, and the acquisition unit selected by the selection unit 1707 is determined as in step S 1602. In step S1803, as in step S1603, an unselected acquisition unit is set as the first system acquisition unit. In step S1804, as in step S1604, the information transmitted to the first system acquisition unit is switched to one piece of new duplex information. Thereafter, in step S1805, as in step S1605, the acquisition unit selected by the selection unit 1707 is changed from the second system acquisition unit to the first system acquisition unit. In step S1806, the process waits until the change in step S1805 is completed. For example, it waits for a predetermined length of time or waits for reception of a signal indicating that a predetermined amount of information has been accumulated in the buffer of the first system acquisition unit. When the change in step S1805 is completed, the process proceeds to step S1807, and the information to be transmitted to the second system acquisition unit 1704 before the change of selection (before step S1805) is updated as in step S1606. Switch to other value information of duplex information.

[Embodiment 4: Main effects]

In the present embodiment, since the switching by the second switching unit is performed after a predetermined period has elapsed since the switching by the first switching unit, the switching between the active system and the standby system is performed by using the new duplex information. The obtained information is acquired to some extent by the first system acquisition unit and is buffered so that it can be surely performed.

Claims

The scope of the claims

[1] A first system acquisition unit that acquires one piece of current duplex information transmitted in a duplexed manner and a second system acquisition that acquires another piece of information of the current duplex information transmitted in a duplexed manner A transmission device comprising:

A first switching unit that switches one piece of information of the duplex information to be transmitted to the first system acquisition unit of the transmission device to one piece of new duplex information that is another duplex information;

A second switching unit that switches the duplex information transmitted to the second system acquisition unit to the other information of the new duplex information after the information of the first system acquisition unit of the transmission device is switched;

A transmission control device comprising:

Powerful switching system.

[2] Transmission equipment

As the acquisition unit for acquiring the information to be output, it has a selection unit for selecting either the first system acquisition unit or the second system acquisition unit

The transmission control device according to claim 1, wherein the transmission control device is a first switching unit that switches one piece of information of the new duplex information, and the selection unit of the transmission device makes the selection and targets a non-selection system. System.

[3] The selection unit of the transmission device is configured so that the second system acquisition unit still has other information of the current duplex information after the first system acquisition unit has been switched to one information of the new duplex information. 3. The switching system according to claim 2, further comprising a period changing unit that changes the acquisition unit to be selected from the second system acquisition unit to the first system acquisition unit during a period in which the system is acquired.

4. The switching system according to claim 3, wherein the second switching unit of the transmission control device has a switching unit after the elapse of a period for performing the switching after the period changing unit of the selection unit of the transmission device makes the change.

[5] A first system acquisition unit that acquires one information of the current duplex information transmitted in a duplexed manner and a second system acquisition that acquires the other information of the current duplex information transmitted in a duplexed manner And an operation method of a transmission control device for switching information transmitted in a duplex manner of a transmission device having:

The duplex information transmitted to the first system acquisition unit of the transmission device is replaced with other duplex information. A first switching step for switching to one piece of heavy information;

A second switching step of switching the duplex information transmitted to the second system acquisition unit to other information of the new duplex information after the information of the first system acquisition unit of the transmission device is switched, and a transmission control device comprising: How it works.