JPH05219066A - Information transmission method - Google Patents

Abstract

(57) [Summary] [Purpose] When data is transmitted via a plurality of transmission lines, the total traffic volume of the transmission lines is suppressed and the security management of the network system is facilitated. [Configuration] A plurality of node devices that control data transfer are connected by a plurality of logical transmission paths to form a network system. Each node device includes means for retrieving a destination node address and a transmission path number from a destination terminal address of data, and a selection circuit and a transmission circuit that enable selection of an arbitrary transmission path for data transmission. When performing data transfer between terminal devices connected to each other via the node device, the data sending node device
A transmission line is selected and data is transmitted only to a specific transmission line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information transmission system,
In particular, in a network system including a plurality of transmission lines for data transfer, an information transmission method in which a sending side node device selects a transmission line, puts data on the transmission line, and transmits the data. Regarding

[0002]

2. Description of the Related Art Generally, control of data transmission / reception in a network system is performed by a method of selecting data on the receiving side.

Further, as another conventional technique, for example, a method of selecting a transmission line on the transmission side and transmitting data to this transmission line, as described in Japanese Patent Laid-Open No. 3-53653. It has been known.

[0004]

In the prior art of controlling data transmission / reception by selecting data on the receiving side, when there are a plurality of transmission lines, the transmitting side terminal device can control all transmission lines. That is, there is a problem in that data must be sent to unnecessary transmission paths, which increases the total traffic volume of the transmission paths. In addition, security is required to send data to all transmission paths. It has a problem that it is difficult to manage.

Further, the conventional technique of selecting a transmission path on the transmission side and transmitting data to this transmission path has a problem that the control for selecting the transmission path on the transmission side device is complicated and difficult. is doing.

An object of the present invention is to solve the above-mentioned problems of the prior art, to suppress the total traffic volume of the transmission line by simple control, and to easily manage the security of the network system. It is to provide an information transmission method.

[0007]

According to the present invention, the object is to uniquely associate the destination node device address with the transmission path information, and in the sending side node device, the destination is based on the destination terminal device address. This is achieved by retrieving the node device address, obtaining transmission line information from the retrieved destination node address, and selecting a specific transmission line to which the data should be transmitted.

[0008] Further, the above-mentioned object is that in the sending side node device, both the destination node device address and the transmission path selection information are obtained from the destination terminal device address, and the data is transmitted only to a specific transmission path. It is achieved by

Further, the above object can be achieved by using the destination node device address and the transmission path selection information which are registered in advance, when the destination node device address is not determined in the sending side node device. ..

Further, the above object is achieved by treating the selection information of the transmission path as a part of the data to be transmitted in the node device.

[0011]

When the data is transferred between the node devices, the sending side node device selects the transmission path and prohibits the data from being transmitted to the unnecessary transmission path. Therefore, the traffic on the transmission path is increased. The security of the network system can be easily managed.

Further, since the transmission path selection information is handled as a part of the data to be transmitted in the node device,
The control in the node device for selecting the transmission path becomes easy, and the hardware configuration can be simplified.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an information transmission system according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing a system configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing a configuration of a node device, and FIGS. 3, 4 and 5 are first to first transmission line determinations. FIG. 6 is a diagram for explaining the third method, and FIG. 6 is a diagram for explaining the format of transmission data including information for selecting a transmission path. 1 and 2, 11 is a data transmission source terminal device, 12 is a transmission side node device, 13 is a reception side node device, 14 is a data transmission destination terminal device, 15 is a transmission path between the terminal device and the node device, Reference numeral 16 is a transmission line connecting the node devices to each other, 22
Is a destination address search circuit, 23 is a transmission path selection circuit,
Reference numeral 24 is a transmission circuit.

The system shown in FIG. 1 is an example of the configuration of a network system that transfers data from a data transmission source terminal device 11 to a data transmission destination terminal device 14 via node devices 12 and 13. A transmission path 1 connecting node devices connected to each other and a node device 13 connected to a destination terminal device 14 to each other.
6 is connected.

Note that, in FIG. 1, for convenience of description, one sending side node device 12 and a plurality of receiving side node devices 13 are connected to the terminal devices 11 and 14, respectively, and in the data transfer direction. However, it is needless to say that the node device and the terminal device can be either the data transmitting side or the data receiving side. In addition, as an example of such a system, for example, a backbone type L aiming for centralized accommodation of branch line LANs.
An example is AN.

In the system of one embodiment of the present invention shown in FIG. 1, a transmission line 16 connecting node devices to each other is constituted by a plurality of n logically divided transmission lines as one set. N receiving-side node devices are connected to the transmission path. A plurality of logically divided transmission lines means a plurality of physically different transmission lines, a plurality of time division multiplexed transmission lines,
It is a plurality of frequency-divided transmission lines and the like.

In the system of the embodiment of the present invention configured as described above, the sending side node device 12 selects a specific one from the plurality of transmission lines 16 as the data sent from the data sending terminal device 11. Then, it is transmitted to the selected transmission path. The plurality of node devices 13 connected to the transmission path to which the data is transmitted decodes the destination address of the data to determine whether or not the data is addressed to itself, and receives only the data addressed to itself, and the data transmission destination terminal Data is transferred to the device 14.

As shown in FIG. 2, the sending side node device 12 has a destination address search circuit 22 and a transmission path selection circuit 2.
3, the transmission circuit 24 is provided. Then, the sending-side node device 12 uses the data transmission source terminal device 11
When the transfer data sent from the receiver is received, the destination address search circuit 22 searches for the address (destination address) of the receiving side node device, and then the transmission path selection circuit 23 selects the transmission path to be transmitted. First, the data to be transmitted is passed to the transmission circuit 24. The transmission circuit 24 determines the necessity / non-necessity of data transmission by each transmission data selection circuit arranged for each transmission line, and is logically divided connected to the transmission line 16 connecting the node devices. Data is transmitted to a specific transmission path of the transmission paths 25.

Next, an example of a transmission path selection method will be described with reference to FIGS. The selection of the transmission line is performed by searching the receiving side node device address using the search information included in the transfer data, actually, the data transmission destination terminal device address, and performing the process of generating the transmission line selection information. Figure 3
~ As described with reference to Fig. 5, there are first to third methods. Then, the above-mentioned transmission path selection information is used by the transmission circuit 24 in the node device on the sending side to determine the necessity / unnecessity of data transmission by the transmission data selection circuit arranged for each transmission path.

In the example shown in FIG. 3, in the destination address search circuit 22, information including the destination terminal address information as the search information, the receiving node device information, and the transmission line number information,
For example, an entry table 32 for retrieving the receiving side node device address is provided, and a decoder 33 for decoding the transmission line selection information from the receiving side node device address found above is provided in the transmission line selection circuit 23. Is.

In the case of this example, there is a unique relationship between the destination node address and the transmission path for transmitting the data, so that the transmission path information can be obtained by decoding the destination node address. You can

In this example, the sending side node device 12 extracts the search information 31 necessary for the search from the transfer data, and the destination address searching circuit 22 searches the destination node device address 34 using the entry table 32. Then, the transmission path selection circuit 23 decodes the destination node device address 34 obtained above by the decoder 33 to generate the transmission path selection information 35.

As the transmission path selection information 35, one or a plurality of transmission path selection information 35 are determined based on the transmission path number included in the destination node device address 35 as described above. The transmission line number can uniquely correspond to the transmission line, and the transmission circuit 24 transmits the data to be transmitted to the determined transmission line.

In the example shown in FIG. 4, in the destination address search circuit 22, an entry table capable of directly searching the information of the receiving node device and the information of the transmission line number from the destination terminal device address as the search information. 42 is provided. The entry table 42 is an entry table 42 for storing the destination node device address.
The transmission path selection information is stored in the same area or another area that can be easily searched from the search information 41. In this case, it is not necessary to have a specific relationship between the destination node device address and the transmission path selection information.

In this example, the sending side node device extracts the search information 41 required for the search from the transfer data, and the destination address search circuit 22 searches the entry table 42 with this search information 41, and the destination node device address + The transmission path selection information 43 can be directly obtained.

The example shown in FIG. 5 is the example described with reference to FIGS. 3 and 4 described above, and shows the operation when the information corresponding to the search information is not registered in the entry table in the search circuit 22 for the destination address. To explain.

In the example shown in FIG. 5, the destination address register 53 and the transmission path in which the predetermined destination node device address and the transmission path selection information are stored in the destination address search circuit 22 and the transmission path selection circuit 23. A selection register 54 is provided. In this case, the address in the destination address 53 and the transmission path selection information in the transmission path selection register 54 can be set to arbitrary values.

Then, the sending side node device extracts the search information 51 required for the search from the transfer data, and the destination address searching circuit 22 searches the destination node device address using the entry table 52. As a result, If the address is unregistered or cannot be searched, the destination address 55 registered in advance in the destination address register 53 and the transmission path selection information 56 registered in the transmission path selection register 54 are used.

Next, the format of transmission data including information for selecting a transmission path will be described with reference to FIG.

The transmission data shown in FIG. 6 is composed of transmission path selection information, a destination address, and transfer data. When the search for the destination node device address described with reference to FIGS. 3 to 5 is completed. When the transmission path selection information is determined, it is transferred to the transmission circuit 24. That is, the transmission path selection circuit 23 in the sending side node device adds the respective information to the transfer data in the format of FIG.

The transmission circuit 24 in the node device on the sending side receives the data of the above-mentioned format by the transmission data selection circuit arranged for each transmission line, and judges the necessity / non-necessity of data transmission based on the transmission line selection information. After that, only the necessary data is transmitted to the corresponding transmission path.

As described above, by handling the transmission path selection information as a part of the data in the node device, the embodiment of the present invention, the transmission path selection circuit 23 and the transmission circuit 2 shown in FIG.
4 does not require a control signal line for selecting a transmission line, and therefore, even if the number of transmission lines is increased, the logic of data selection in the sending side node device and the logic around data transmission are not complicated.

In the above-described embodiment of the present invention, particularly when the data selection circuit and the data transmission circuit are realized by separate LSIs or boards, there is no increase in interface signals, and therefore, there is no effect due to pin limitation.

Further, in the above-described embodiment of the present invention, a stage in which the transmission circuit in the node device on the transmission side determines the transmission line for the area used for the transmission line selection information in the transfer data format shown in FIG. Can be used as the control information area of the network system.

According to the above-described embodiment of the present invention, by controlling the use of the transmission path by the sending side node device, the traffic of the transmission path can be suppressed and the security management of the network system can be easily performed. You can

Further, according to the embodiment of the present invention, a transmission path is selected by associating a part of the destination address with the transmission path, and the selection information of the transmission path is obtained by searching the destination address to select the transmission path. Therefore, it is possible to select the transmission path with a simple logic.

Further, according to the embodiment of the present invention, since the transmission path selection information is processed as a part of the data, the control signal line which increases in proportion to the number of transmission paths can be eliminated. It is possible to reduce the scale of control logic.

[0039]

As described above, according to the present invention, it is possible to suppress the total traffic volume of the transmission path and easily manage the security of the network system.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing a configuration of a node device.

FIG. 3 is a diagram illustrating a first method of determining a transmission path.

FIG. 4 is a diagram illustrating a second method for determining a transmission path.

FIG. 5 is a diagram illustrating a third method of determining a transmission path.

FIG. 6 is a diagram illustrating a format of transmission data including information for selecting a transmission path.

[Explanation of symbols]

 11 data source terminal device 12 sender node device 13 receiver node device 14 data destination terminal device 15 transmission line between terminal device and node device 16 transmission line connecting node devices to each other 22 destination address search circuit 23 Transmission path selection circuit 24 Transmission circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takinori Yoneno 5-22-1, Kamimizumoto-cho, Kodaira-shi, Tokyo Inside Hitachi Microcomputer System Co., Ltd. Address Company Hitachi, Ltd. System Development Laboratory (72) Inventor Isao Takanishi 1 Horiyamashita, Hadano City, Kanagawa Prefecture

Claims (5)

[Claims] 1. In a network system configured by connecting a plurality of node devices for controlling data transfer through a plurality of logical transmission paths, each of the node devices is a destination terminal added to transmission data. It is characterized in that it comprises means for retrieving a destination node device address from a device address and means for selecting a transmission path, and that data is transmitted between terminal devices that are mutually connected via node devices. Information transmission method. 2. The transmission path is selected based on the destination node device address by providing a unique relationship between the destination node device address obtained as a result of the search and the transmission line transmitting the data. The information transmission system according to claim 1. 3. A network system configured by connecting a plurality of node devices for controlling data transfer through a plurality of logical transmission paths, wherein each of the node devices is a destination terminal added to transmission data. It is characterized by comprising means for simultaneously searching for a destination node device address from a device address and a transmission path for transmitting data, and for transmitting data between terminal devices mutually connected via a node device. Information transmission method. 4. If the destination node address cannot be obtained as a result of the search, the transmission path to transmit the data is selected using the information registered in advance. Or the information transmission method described in 3. 5. The information transmission system, wherein the node device internally handles information for selecting a transmission path by adding it to transfer data.