JP2012105164A - Information transmission system and train transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a railroad vehicle system which can make even an apparatus without plural transmission interfaces corresponding to plural-channel transmission paths adaptable to transmission line duplexing.SOLUTION: An apparatus without plural transmission interfaces corresponding to plural-channel transmission paths is connected to a duplex transmission path via a duplex conversion device, in which case the duplex conversion device duplicates a packet received from the apparatus, one of duplicate packets having its destination IP address converted to an IP address indicating a channel-1 transmission path before being transmitted to the channel-1 transmission path and the other packet having its destination IP address converted to an IP address indicating a channel-2 transmission path before being transmitted to the channel-2 transmission path. Furthermore, in the duplex conversion device which has received a packet from a channel-1 or a channel-2 transmission path, the received packet has its destination IP address converted to an IP address indicating a transmission path to which connected is an apparatus without plural transmission interfaces corresponding to plural-channel transmission paths before being transmitted to the apparatus.

Description

  The present invention relates to an information transmission system mounted on a railway vehicle.

  In a railway vehicle transmission system that uses a transmission line that makes a one-to-one connection, such as a network that conforms to the IEEE 802.3 standard, and that constitutes a dual transmission line, a system that has only one transmission interface. In order to connect to a dual transmission system consisting of a transmission line and a two-line transmission line, the first-line transmitter connected to the first-line transmission line, the two-line transmitter connected to the second-line transmission line, and the device are connected. The transmission switching unit is configured to copy the data sent from the device to the first-system transmitter and the second-system transmitter for transmission. In addition, for data sent from one or both of the system 1 transmitter and system 2 transmitter, the transmission switching unit selects only one data based on a predetermined standard and transmits it to the destination device. This makes it possible to connect a device having only one transmission interface to the duplex transmission system.

JP 2008-295210 A

  The prior art is effective when the entire system 1 transmission path and system 2 transmission path are the same IP subnet (the same network address). However, both the system 1 transmission path and the system 2 transmission path have a plurality of transmission interfaces. Equipment that is connected to the system at the same time, equipment that has only one transmission interface, but that needs to be connected to both the 1-system transmission path and the 2-system transmission path, and only one transmission interface In a system in which devices that can only be connected to one of the transmission lines or the two-system transmission line are mixed, when identifying each transmission interface of each device using an IP address, a packet (packet: unit of information transmission) is used. In order to distinguish the output transmission paths, it is necessary to manage the duplicated networks with different IP subnets.

  However, in the prior art, when the IP subnet is separated by the 1-system transmission path and the 2-system transmission path, and different network addresses are assigned, the packet transmitted from the device is copied by the transmission switching unit and the 1-system transmission path For example, if data is sent to a device that has multiple transmission interfaces and is connected to both the 1-system transmission path and the 2-system transmission path at the same time, the 1-system transmission is performed. Even if data having a destination IP address addressed to the transmission interface of the device connected to the path flows directly to the second transmission line, the packet addressed to the first transmission interface is transmitted in the transmission interface of the device connected to the second transmission path. Cannot receive the function of the duplex transmission line system.

  Therefore, in the present invention, in a multiplex transmission system in which each system transmission path needs to be configured with different IP subnets, even if a device does not have a plurality of transmission interfaces corresponding to a plurality of transmission paths, the transmission path multiplexing is performed. It aims to be able to cope with.

  In order to solve the above problems, the present invention generates a plurality of packets having destination identifiers corresponding to each system, from packets transmitted by a device and including identifiers indicating destination transmission path systems. The plurality of packets are transmitted to a transmission line of a system corresponding to the identifier.

  Alternatively, the device has a transmission interface for transmitting and receiving packets to and from the transmission line, and the device includes a first device that does not have a plurality of transmission interfaces corresponding to each system of at least a duplexed transmission line. In the packet transmitted by the first device, a part of the identifier indicating the destination of the packet is converted into an identifier that clearly indicates a transmission path of any system to be transmitted, and the specified transmission path is transmitted. And

  In the present invention, in a multiplex transmission system in which each system transmission path needs to be configured with different IP subnets, even a device that does not have a plurality of transmission interfaces corresponding to a plurality of transmission paths can be used for transmission path multiplexing. It can be made available.

It is a figure showing the composition of the train transmission system concerning one embodiment of the present invention. It is a figure showing the composition of the train transmission system concerning one embodiment of the present invention. It is a figure which shows the packet relay method which concerns on one Embodiment of this invention. It is a figure which shows the packet relay method which concerns on one Embodiment of this invention. It is a figure which shows the address translation method of the packet which concerns on one Embodiment of this invention. It is a figure which shows the structure of the duplex conversion apparatus which concerns on one Embodiment of this invention. It is a figure showing the composition of the train transmission system concerning one embodiment of the present invention. It is a figure which shows the structure of the relay apparatus which concerns on one Embodiment of this invention. It is a figure which shows the address translation method of the packet which concerns on one Embodiment of this invention. It is a figure which shows the packet transmission which concerns on one Embodiment of this invention. It is a figure which shows the packet transmission which concerns on one Embodiment of this invention. It is a figure which shows the packet relay method which concerns on one Embodiment of this invention. It is a figure which shows the packet relay method which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
A first embodiment will be described.

  First, FIG. 1 and FIG. 2 show a configuration example of a railway vehicle system according to the first embodiment.

  In the railway vehicle system in FIG. 1, the train is composed of at least one vehicle 100. Each vehicle 100 has a double transmission line for transmitting data, that is, a system 1 trunk transmission line 91, a system 2 trunk transmission line 92, a system 1 branch transmission line 910, and a system 2 branch transmission line 920. It is comprised from the relay apparatuses 21 and 22 which relay a packet between a transmission line and a branch line transmission line.

  Further, as shown in FIG. 2, the branch transmission lines 910 and 920 of each system of each vehicle 100 are connected to at least a 1-system transmission interface 281 and a 2-system branch transmission line 920 connected to the 1-system branch transmission line 910. A device 291 having a two-system transmission interface 282, a device 292 having a transmission interface 283 connected to a single device transmission path 930 and not having a plurality of transmission interfaces corresponding to each system, and a one-system branch transmission path 910 A duplex conversion device 200 connected to the two-system branch transmission line 920 and the single-unit transmission line 930, and a device 293 having only the one-system transmission interface 281 connected to the first-system branch transmission line 910, or two-system branch transmission A device 293 having only the 2-system transmission interface 282 connected to the path 920 is connected.

  Each transmission interface 281, 282, 283 provided in each device is set with an IP address that clearly indicates the connected transmission path. As an example of setting an IP address, for example, when an IP address “10.A.B.C / 16” is used as an identifier for identifying each transmission interface, A indicates a transmission path system connecting the transmission interfaces. When A = a1, it indicates that the system is connected to the system 1 branch transmission line 910. When A = a2, it indicates that the system is connected to the system 2 branch transmission line 920, and when A = a3. It represents that it is connected to the single device transmission path 930, B may represent the car number, and C may represent the unique number of the device. Note that a3 = a1 or a3 = a2.

  Further, for example, when a multicast IP address “239.A.D.E” is used as a destination IP address of a packet transmitted from each transmission interface, if A = a1, the first branch transmission lines 910 and the first system are used. This means that the transmission is performed on the trunk transmission line 91. If A = a2, this means that the transmission is performed on the second branch transmission line 920 and the second trunk transmission line 92. If A = a3, the single device transmission line is transmitted. 930 may be transmitted, and D and E may represent identifiers that specify reception groups of multicast packets. Note that a3 = a1 or a3 = a2.

  Next, the operation of duplex conversion apparatus 200 will be described using FIGS. 3 and 4 and the above-described IP address setting example.

  In FIG. 3, duplex conversion apparatus 200 that receives a packet (including data 700 and header 713) from device 292 that does not have a plurality of transmission interfaces corresponding to each system duplicates the packet, and as shown in FIG. One packet (including data 700 and header 711) converts the destination IP address (A = a3) into a destination IP address (A = a1) that clearly indicates the first system transmission path and transmits it to the first system branch transmission path 910 The other packet (including the data 700 and the header 712) converts the destination IP address (A = a3) into a destination IP address (A = a2) that clearly indicates the system 2 transmission path and transmits it to the system 2 branch transmission path To do.

  The packet (including data 700 and header 711) transmitted to the 1-system branch transmission line 910 is relayed and transmitted to the 1-system trunk line 91 by the 1-system relay device 21. Similarly, the packet (including data 700 and header 712) transmitted to the second-system branch transmission line 920 is relayed to the second-system trunk transmission line 92 by the second-system relay device 22 and transmitted.

  On the other hand, in FIG. 4, packets (including data 700 and header 711) received by the duplexing conversion device 200 among the packets relayed from the system 1 trunk transmission line 91 to the system 1 branch transmission path 910 by the system 1 relay apparatus 21. The destination IP address (A = a1) is converted into a destination IP address (A = a3) clearly indicating the single device transmission path 930 (including the data 700 and the header 713) and transmitted to the single device transmission line 930. To do. Similarly, the packet (including data 700 and header 712) received by the duplex conversion device 200 among the packets relayed from the second-system trunk transmission line 92 to the second-system branch transmission line 920 by the second-system relay device 22 is the destination IP. A packet (including data 700 and header 713) obtained by converting the address (A = a2) into a destination IP address (A = a3) that clearly indicates the single device transmission line 930 is transmitted to the single device transmission line 930.

  In FIG. 4, when the duplex conversion device 200 receives the same data 700 packet from both the first branch transmission line 910 and the second branch transmission line 920, after the destination IP address conversion, the prior art of Patent Document 1 is used. Similarly to the method described, only one of the packets may be selected and the destination address may be converted and transmitted to the device 292. Either packet may be transmitted to the device 292, and either one of the packets may be transmitted by the device 292. May be selected.

  The duplex conversion apparatus 200 expresses the above-described processing by a logical symbol and implements hardware using an FPGA (Field Programmable Gate Array) or the like, and operates packet reception, data conversion, and packet transmission in parallel using a network processor. Is possible. Further, the present invention can be realized by software operating on a computer having a CPU (Central Processing Unit), and a hardware configuration example in that case is shown in FIG.

  In FIG. 6, the duplex conversion apparatus 200 stores a transmission / reception data, a processing program, initial setting information, log information, and the like with an arithmetic unit 201 equipped with a CPU, a cache memory, a main memory, and the like that perform processing of each unit. System transmission line interface having a data transmission / reception interface function between storage device 204 such as a hard disk, silicon disk, and non-volatile memory for storing data and system 1 relay apparatus 21 via system 1 branch transmission line 910 2 system transmission line interface apparatus 212 having an interface function of data transmission / reception between the apparatus 211 and the 2 system branch line transmission path 920 and the 2 system relay apparatus 22, and each system through the single device transmission path 930. An interface function for data transmission / reception with a device 292 that does not have a plurality of corresponding transmission interfaces. One and device interface unit 213, and a.

  Further, if necessary, an input device 202 such as a switch or a keyboard for inputting initial setting items such as an address and an operation mode of a transmission path, and an LED or a liquid crystal panel for confirming the setting items, displaying an operation state or log information An output device 203 such as may be mounted.

  Further, each transmission path 91, 92, 910, 920, 930 may use a wired transmission means such as LAN conforming to IEEE802.3 standard, SDH (Synchronous Digital Hierarchy), ATM (Asynchronous Transfer Mode), etc. Wireless transmission means such as a wireless LAN conforming to the IEEE 802.11 standard may be used.

  In the above description, only the destination IP address is converted. However, as shown in FIG. 9, there is a method for converting both the destination IP address and the source IP address. Compared to the method of converting only the destination IP address, in the method of converting both the destination IP address and the source IP address, the source device 292 is virtually not viewed from the device 291 or 293 side receiving the packet. It can be seen as having a transmission interface corresponding to the transmission path of each system, and especially for a response packet (ACK) received from the 1 system transmission path when performing TCP / IP communication. It is possible to send a reply to the system 2 transmission path to the system 1 transmission path for those received from the system 2 transmission path.

  The first embodiment has been described above.

  As described above, in this embodiment, there are a mixture of devices that do not have a plurality of transmission interfaces corresponding to each system and devices that have a plurality of transmission interfaces and are connected to the transmission paths of each system. In a multiplex transmission system that needs to be configured with different IP subnets in the transmission line of the system, packets transmitted by devices that do not have a plurality of transmission interfaces corresponding to each system are transmitted to other systems. Multiple transmission interfaces corresponding to each system by enabling devices that do not have a plurality of transmission interfaces corresponding to each system to receive packets sent from the transmission paths of the plurality of systems. Even a device that does not have a transmission line can be made to support transmission path multiplexing.

[Second Embodiment]
In the first embodiment described above, the destination address conversion is performed by the duplex conversion device 200. However, a method in which the destination address conversion function is performed by the relay devices 21 and 22 of each system is also conceivable.

  Therefore, a second embodiment will be described next.

  The operation of the duplex conversion device 200 and the 1-system relay device 21 will be described with reference to FIGS.

  In FIG. 12, duplex conversion apparatus 200 that has received a packet (including data 700 and header 713) from device 292 duplicates the packet and transmits it to system 1 branch transmission line 910 and system 2 branch transmission line 920, respectively.

  The 1-system relay device 21 that has received the packet (including the data 700 and the header 713) from the 1-system branch transmission line 910 has a destination IP address (including the data 700 and the header 713) as shown in FIG. A packet (including data 700 and header 711) obtained by converting A = a3) into a destination IP address (A = a1) that clearly indicates the system 1 transmission path is transmitted to the system 1 trunk transmission path 91.

  On the other hand, the second-system relay device 22 that has received the packet (including the data 700 and the header 713) from the second-system branch transmission line 920, as shown in FIG. 5, receives the destination IP of the packet (including the data 700 and the header 713). A packet (including data 700 and header 712) obtained by converting the address (A = a3) into a destination IP address (A = a2) that clearly indicates the second-system transmission path is transmitted to the second-system trunk transmission path 92.

  In FIG. 13, the 1-system relay device 21 that has received a packet (including the data 700 and the header 711) from the 1-system trunk transmission line 91 clearly indicates the destination IP address (A = a1) as the single-equipment transmission line 930. Packet (including data 700 and header 713) converted to the destination IP address (A = a3) to be transmitted to the system 1 branch transmission line 910. When duplexing conversion apparatus 200 receives the packet (including data 700 and header 713) from system 1 branch transmission line 910, duplexing conversion apparatus 200 transmits the packet to single device transmission line 930.

  On the other hand, the second-system relay device 22 that has received the packet (including the data 700 and the header 712) from the second-system trunk transmission path 92, designates the destination IP address (A = a2) as the destination IP address that clearly indicates the single device transmission path 930. The packet (including data 700 and header 713) converted to (A = a3) is transmitted to the second-system branch transmission line 920. When duplexing conversion apparatus 200 receives the packet (including data 700 and header 713) from secondary branch transmission line 920, duplexing conversion apparatus 200 transmits the packet to single device transmission line 930.

  In FIG. 13, when duplex conversion apparatus 200 receives the same data 700 packet from both system 1 branch transmission line 910 and system 2 branch transmission line 920, it is the same as the method described in the prior art of Patent Document 1. Alternatively, only one of the packets may be selected and the destination address may be converted and transmitted to the device 292, or any of the packets may be transmitted to the device 292 and the device 292 may select one of them.

  Further, the 1-system relay device 21 and the 2-system relay device 22 represent the above-described processing by logical symbols, which are implemented by hardware such as an FPGA (Field Programmable Gate Array) or the like, packet reception, data conversion, and packet transmission using a network processor. It is possible to operate transmissions in parallel. Further, the present invention can also be realized by software operating on a computer having a CPU (Central Processing Unit), and a hardware configuration example in that case is shown in FIG.

  In FIG. 8, the 1-system relay device 21 accumulates transmission / reception data, processing programs, initial setting information, log information, and the arithmetic device 251 equipped with a CPU, a cache memory, a main memory, and the like that perform processing of each unit. Branch transmission with an interface function for data transmission / reception between a storage device 254 such as a hard disk, a silicon disk, or a non-volatile memory that stores data, etc., and a device connected to the branch side via the 1-system branch transmission line 910 And a trunk transmission line interface 261 having an interface function for data transmission / reception between the trunk interface transmission line 263 and the adjacent system 1 relay apparatus via the system 1 trunk transmission line 91. Note that a plurality of main transmission line interfaces 261 may be provided in accordance with the number of adjacent 1-system relay devices 21, and one main transmission line interface 261 is connected to all adjacent 1-system relay devices 21. Also good.

  If necessary, an input device 202 such as a switch or a keyboard for inputting initial setting items such as an address and an operation mode of a transmission path, an LED or a liquid crystal panel for confirming the setting items, displaying an operation state or log information An output device 203 such as may be mounted.

  Since the second system relay device 22 has the same configuration as the first system relay device 21, description thereof is omitted.

  The second embodiment has been described above.

  Compared with the first embodiment, the second embodiment performs IP address conversion only by changing to the relay devices 21 and 22 of each system instead of the duplex conversion device 200, and the effect of the invention is the first. This is the same as the first embodiment.

  However, in the above-described second embodiment, the duplexing conversion apparatus 200 does not require the IP address conversion process, and thus can simplify the internal processing.

[Third Embodiment]
In the second embodiment described above, the internal processing of the duplex conversion apparatus 200 can be simplified. Further, a method of applying a device having a switching hub function used in a LAN compliant with the IEEE 802.3 standard as the duplex conversion device 200 can be considered.

  Therefore, a third embodiment will be described next.

  When a switching hub (for example, Center COM FS808TP V1 manufactured by Allied Telesis Co., Ltd.) used in a LAN conforming to the IEEE 802.3 standard is applied to the duplex conversion device 200, transmission is performed from a device 292 that does not have a plurality of transmission interfaces corresponding to each system The multicast packet and broadcast packet thus transmitted are transmitted to both the first branch transmission line 910 and the second branch transmission line 920, and in each of the relay apparatuses 21 and 22, the IP address as in the second embodiment described above. Are converted and relayed to the trunk transmission lines 91 and 92 of each system.

  However, as a problem when the switching hub used in the LAN conforming to the IEEE 802.3 standard is applied to the duplex conversion apparatus 200, the relay apparatus 21 and 22 relay the system from the trunk transmission lines 91 and 92 of each system. When a multicast packet or a broadcast packet that has flowed into the duplexing converter 200 from one branch transmission line (910 or 920), not only the packet is transmitted to the device 292 but also the other branch transmission line (920 or 920). The packet is also transmitted to 910). Thereafter, as shown in FIG. 10, the relay device of the other system relays the multicast packet or broadcast packet from the branch transmission line of the other system to the main transmission line of the other system, and this phenomenon is repeated. The packet circulates infinitely between the transmission paths of both systems, and the transmission path load suddenly increases, so that the entire system may fall into a state where packet transmission cannot be performed.

  Therefore, as described in the example of the IP address in the first embodiment, a numerical value indicating the car number is clearly shown in the IP address, and the branch line is connected from the branch transmission line side in the relay devices 21 and 22 of each system. When a packet having a transmission source IP address specifying a car number different from the car number of the vehicle to which the car belongs is received, the packet is discarded without being relayed to the main transmission line.

  An example is shown in FIG. In FIG. 11, the car number Y is clearly indicated in the transmission source IP address in the header of the multicast packet or broadcast packet transmitted from the car number Y to the second-system trunk transmission line 92, and the car number Y is transmitted from the car number Y. When the packet is received from the 1-system branch transmission line 910 by the 1-system relay device 21 of the car number Z, the packet transmitted from the car number Y is discarded without being relayed, and is routed through the 1-system trunk transmission line. Thus, it can be prevented that the data is transmitted to another vehicle.

  However, in the above method, a packet generated by one relay device in the same car and transmitted to the branch transmission line is not discarded by the other relay device, but is relayed to the main transmission line of the other system. There's a problem. Therefore, in the relay devices 21 and 22 of each system, when a packet having a transmission source IP address clearly indicating a vehicle number different from the vehicle number of the vehicle to which the branch line belongs is received from the branch line transmission path side, or the transmission source When a packet whose IP address is a relay device of another system in the own car is received, the packet may be discarded without being relayed to the main transmission line.

  The third embodiment has been described above.

  By implementing the above-described packet discarding function in the relay apparatuses 21 and 22 of each system, it becomes possible to simplify the duplex conversion apparatus 200 and to apply an apparatus having a switching hub function.

[Fourth Embodiment]
In the first, second, and third embodiments, there is a problem that when power supply to the duplex conversion device 200 is interrupted, packets cannot be transmitted to both systems. Therefore, as a fourth embodiment, as illustrated in FIG. 7, the duplex conversion device 200 includes a 1-system power supply device 851 that supplies power to the 1-system relay device 21 or another 1-system device, and a 2-system relay. Even if power is supplied from both the power supply device 852 that supplies power to the device 22 or other 2 system devices, and the power supply stops due to a failure in one power supply device, the power supply from the other power supply device Receives power and allows packet transmission to continue.

  At this time, the duplex conversion apparatus 200 may detect a system to which power is supplied and perform IP address conversion only to the system to which the power is supplied to relay the packet.

  The fourth embodiment has been described above.

  As described above, in the embodiment of the present invention, there are a mixture of devices that do not have a plurality of transmission interfaces corresponding to each system and devices that have a plurality of transmission interfaces and are connected to a plurality of transmission paths in each system. In a multiplex transmission system that needs to be configured with different IP subnets on the transmission paths of each system, packets transmitted by devices that do not have a plurality of transmission interfaces corresponding to each system are transmitted to other systems. It is possible to receive from a transmission line, and a device that does not have a plurality of transmission interfaces corresponding to each system can receive a packet sent from a plurality of transmission lines. Even devices that do not have a transmission interface can be adapted to transmission path multiplexing.

  In each of the above-described embodiments, an IP address is used as a means for clearly indicating a transmission path on which a packet is to be transmitted and a vehicle number, but a port number used in TCP or UDP or the IEEE802.1D standard. Even if a specified VLANID or the like is used, it is possible to apply each of the above examples, and the same effects as those of the above embodiments can be obtained.

  Further, as a means for clearly indicating the transmission path for transmitting the packet and the vehicle number of the vehicle, a unique explicit area is provided in the packet, and the duplex conversion apparatus 200 and the relay apparatuses 21 and 22 of each system set the value of the explicit area. It may be referenced or converted. Even in this case, the above-described embodiments can be applied, and the same effects as those of the above-described embodiments can be obtained.

  In addition, although the railway vehicle system in each of the above-described embodiments assumes a duplex transmission path, the above-described embodiments are also applied to a multiplexed transmission path of triple or more by increasing the number of transmission interfaces corresponding to each system. It is possible to achieve the same effects as the above embodiments. That is, the transmission path interface apparatus shown in FIG. 2 of the duplex conversion apparatus described in each of the above-described embodiments may be further multiplexed so as to be able to cope with a plurality of transmission paths. In the fourth embodiment, the power of the duplex conversion device may be supplied from the multiplexed power supply devices.

  In each of the above-described embodiments, even when a plurality of devices 292 are connected to the single-device transmission path 930 side of the duplex conversion device 200, the same effects as those of the above-described embodiments can be obtained.

21 1-system relay device 22 2-system relay device 91 1-system trunk transmission line 92 2-system trunk transmission line 100 vehicle 200 duplex conversion device 201 arithmetic device 202 input device 203 output device 204 storage device 211 1-system transmission line interface device 212 2 systems Transmission path interface device 213 Device interface device 281 System 1 transmission interface 282 System 2 transmission interface 283 Transmission interface 291, 292, 293 Device 700 Data 711, 712, 713 Header 851 System 1 power supply device 852 System 2 power supply device 910 System 1 branch transmission Route 920 Two-branch transmission line 930 Single device transmission line

Claims (12)

In an information transmission system comprising at least a duplex transmission line and a device connected via the transmission line and capable of transmitting information to each other,
A plurality of packets having destination identifiers corresponding to each system are generated from packets transmitted by the device and including identifiers indicating destination transmission path systems, and the generated plurality of packets are associated with the identifiers. An information transmission system for transmitting to a transmission path of a system to be operated. The information transmission system according to claim 1,
The packet includes an identifier indicating a transmission path system of a destination and a transmission source,
A plurality of packets having destination and transmission source identifiers corresponding to each system are generated from the packets transmitted by the device, and the generated plurality of packets are transmitted to a transmission path of the system corresponding to the identifiers. An information transmission system characterized by that. In the information transmission system according to claim 1 or 2,
A plurality of packets generated by generating a plurality of packets having the identifier corresponding to each system, based on the packets transmitted by the device and connected to the device and at least the duplex transmission path, respectively. An information transmission system comprising: a conversion device that transmits a signal to a transmission line of a system corresponding to the identifier. In the information transmission system according to claim 3,
The transmission path is composed of a backbone transmission path that connects between different vehicles, and a branch transmission path that connects to the equipment in the vehicle,
Comprising at least a duplex relay device that relays between the trunk transmission line and the branch transmission line;
The information conversion system, wherein the conversion device receives power from a plurality of power supply devices that supply power to the plurality of relay devices, and transmits a packet to a system to which the power is supplied. In the information transmission system according to claim 1 or 2,
The transmission path is composed of a backbone transmission path that connects between different vehicles, and a branch transmission path that connects to the equipment in the vehicle,
Comprising at least a duplex relay device that relays between the trunk transmission line and the branch transmission line;
The relay apparatus converts the identifier of the packet transmitted by the device in correspondence with a relay destination trunk transmission line system and relays the packet to the trunk transmission line. The information transmission system according to claim 5, wherein
The transmission source device of the packet clearly indicates the vehicle number information of the vehicle mounted on a part of the identifier indicating the transmission source,
In the relay device, when a packet received from the branch transmission line includes a car other than the car as a part of an identifier indicating the transmission source, or in a part of the identifier indicating the transmission source An information transmission system that discards the packet when another relay device is specified. In a train transmission system having at least a duplex transmission path that connects equipment in the same vehicle and equipment of different connected vehicles,
The device has a transmission interface for transmitting and receiving packets to and from the transmission path,
The device includes a first device that does not have a plurality of transmission interfaces corresponding to each system of the transmission path that is at least duplexed,
In the packet transmitted by the first device, a part of the identifier indicating the destination of the packet is converted into an identifier that clearly indicates a transmission path of any system to be transmitted, and is transmitted through the specified transmission path. A characteristic train transmission system. In the train transmission system according to claim 7,
In the packet transmitted by the first device, part of the identifier indicating the destination and source of the packet is converted into an identifier that clearly indicates one of the transmission paths to be transmitted, and transmitted through the specified transmission path. A train transmission system characterized by In the train transmission system according to claim 7 or claim 8,
Connected to each of the first equipment and at least each duplexed transmission line;
The packet received from the first device is duplicated, part of the identifier of each duplicated packet is converted into an identifier that clearly indicates the transmission path of the transmission system, and is specified in the identifier obtained by converting each packet. A train transmission system comprising a conversion device having a function of transmitting data to a transmission line of a new system. In the train transmission system according to claim 9,
The transmission path is composed of a backbone transmission path that connects between connected different vehicles, and a branch transmission path that connects to the equipment in the same vehicle,
A relay device that relays packets between the backbone transmission line and the branch transmission line;
The conversion device is supplied with power from at least a plurality of power supply devices that supply power to the relay devices or the devices of each system duplexed,
Convert at least a part of the identifier indicating the destination of the packet into an identifier that clearly indicates the transmission path of the system that is supplied with power, and output the packet to the transmission path of the system that is supplied with power Train transmission system characterized by In the train transmission system according to claim 7 or claim 8,
When relaying a packet transmitted by the first device from a branch transmission line connecting devices in the same vehicle to a trunk transmission line connecting different connected vehicles, at least a part of an identifier indicating a destination A train transmission system comprising: a relay device that relays the information by converting the information into an identifier that clearly indicates the system of the trunk transmission line as a relay destination. In the train transmission system according to claim 11,
The transmission source device of the packet clearly indicates the vehicle number information of the vehicle mounted on a part of the identifier indicating the transmission source,
The relay device discards a packet in which a car other than its own car is specified in a part of an identifier indicating a transmission source among packets received from the branch line transmission path connecting devices in the same vehicle, or A train transmission system for discarding a packet indicating that an identifier indicating a transmission source is another relay device in the own car.

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