JPS622746B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention connects different data communication networks that are provided at the connection points of lines and are independently given addresses for node devices that perform data transfer, and transmits and receives messages between mutual node devices. The present invention relates to an interconnection system for data communication networks for the purpose of communication.

For example, as shown in FIG. 1, a node device 13 is provided at the connection point of the line 12 in the data communication network 11, and each node device 13 is given a different address, and by specifying that address, the line 12 and Data can be sent and received between two node devices through the node device 13. Further, there is a data communication network 14 independent from this data communication network 11, and the data communication network 1
4 is also configured so that data is sent and received between the node devices. Conventionally, the following two methods have been used to transmit and receive messages between node devices of different data communication networks 11 and 14 that are independently assigned addresses. The first method is to reallocate addresses of node devices so that they are unique across a plurality of interconnected data communication networks 11, 14. In other words, the addresses are assigned so that no node devices within these data communication networks have the same address.
This method has the disadvantage that it is necessary to add or change items in the routing table provided in each node device for determining the outgoing route.

The second method is to give a unique data communication network number to each data communication network 11, 14 to be connected to each other, and add a data communication network number part as address information of the message. Within the data communication network on the originating side, the outgoing route is determined based on the data communication network number, and the route for transferring the message to the data communication network on the receiving side is determined (routing). This method requires a routing table based on data communication network numbers in addition to a routing table based on node device addresses, and requires a routing table based on data communication network numbers, which includes multiple interconnected data communication networks and independent multiple interconnected data communication networks. When further integrating and interconnecting the data communication network numbers, there was a drawback that data communication network numbers had to be reallocated and items in the routing table of data communication network numbers had to be added or changed accordingly.

The purpose of this invention is to eliminate the need to add or change the routing table based on node device addresses, and also eliminate the need for data communication network numbers. An object of the present invention is to provide an interconnection system for data communication networks that allows data communication networks to easily transmit and receive data.

According to this invention, an interconnection indication and an address uniquely given by a specific device commonly used by interconnected data communication networks to a node device connected to that specific device are included in a telegram as identification information of the data communication network. Then, within the originating data communication network, the message is routed to the specific device based on the interconnection indication, and the message is transmitted to the destination data communication network via the specific device.

FIG. 1 is a diagram illustrating an example of the format of a message used in the present invention, in which an interconnection display section (hereinafter referred to as LNI) 15 is provided. This LNI1
When 5 is 1, it indicates that the message is sent to another data communication network, and when it is 0, it indicates that the message is within the own data communication network. After LNI15,
An address storage section 16 is provided for a node device address given by a specific device commonly used by both communication networks. This address storage section 16 consists of a receiving PA section 17 and a calling PA section 18 for the receiving side and the calling side, respectively. Furthermore, there is an address storage section 19 for a node device address that is uniquely assigned within one data communication network, and this address storage section 19 consists of a terminating NA section 21 and an originating NA section 22 for the terminating side and the originating side, respectively. Other control information 23 and data 24 are provided.

As shown in FIG. 3, the message transmission processing mechanism in the node device other than the node device connected to the specific device commonly used in both communication networks transmits the received message between the communication networks by the interconnection determination unit 25. The LNI 15 determines whether it is a specific device or not, and if LNI = 1, the specific device output route storage unit 26 that stores the output route to the specific device is accessed based on the contents of the address field 16, and the output route is accessed. route is determined. LNI
If =0, the outgoing route is determined by the outgoing route determining unit 27 from the node device address in the address section 19.
Specific device exit route storage unit 26 or exit route determination unit 27
The message is sent by the message sending unit 28 to the output route determined in .

In the message transmission processing mechanism of the node device connected to the specific device, the matching processing section 29 is
It is added to the processing mechanism shown in the figure. This matching processing unit 29 sets LNI=0 when LNI=1 and sets the address of the issuing PA unit 22, and also sets the address of the output PA unit 22 when the output route determining unit 27 selects the output route to a specific device, the node device The corresponding address in the address storage unit 16 for departure and arrival is set from the address storage unit 19.

FIG. 5 shows a data communication network 11 made up of node devices 13 and specific devices 31 with addresses A, B, C, and D, respectively, and a data communication network 11 made up of node devices 13 and specific devices 31 with addresses E, F, G, and H, respectively. FIG. 2 is a diagram showing a data communication network 14. The specific device 31 is commonly used in the data communication networks 11 and 14, and is a device that uniquely assigns an address to the node device 13 connected thereto and performs routing based on the address, and corresponds to, for example, a packet switching network. In this example, the node device 13 connected to the specific device 31
have addresses wx and yz assigned by the specific device 31, in addition to addresses CD and EF uniquely assigned within each data communication network 11 and 14, respectively.

FIG. 6 shows data communication network 14 from node device 13 at address A of data communication network 11 shown in FIG.
This is a diagram showing how the message shown in FIG. 2 is sent to the node device 13 at the address H of , by the message transmission processing mechanism shown in FIGS. 3 and 4, and its operation will be explained below. .

Node device 13 at address A has LNI=1,
The PA section 17 receives the address Z given by the specifying device 31 of the node device 13 at address F connected to the specifying device 31 on the communication path leading to the node device 13 at address H on the receiving side, and the destination NA section 21 receives the incoming call. A message is created in which the address H of the node device 13 on the side and the address A of the node device 13 on the source side are set in the originating NA section 22, respectively, and an outgoing route toward the specific device 31 is created.
Send to ab. The node device 13 at the relay address B determines that LNI=1 in the interconnection determination 25, and requests the specific device output route storage unit 26 for an output route to the specific device 31. The specific device output route storage unit 26 notifies the message transmission unit 28 of the output route bc, and the message transmission unit 28 sends the message to the output route bc to reach the node device 13 at address C. The node device 13 at address C is the specific device 31
connected to the LNI in this device.
= 1, the specific device output route storage unit 26 determines the output route cp, the matching processing unit 29 sets LNI = 0, and the output PA unit 2
2, the address W of the node device 13 of the address C given by the specific device 31 is set, and the message sending unit 28 sends the message to the outgoing route cp. The specific device 31 sends a message to the node device 13 at the address F according to the address Z of the destination PA section 17. In the node device at address F, LNI=0 is determined, and the outgoing route determining unit 27 determines the outgoing route fg from the routing table based on the address H of the destination NA unit 21. Also in the node device 13 at address G, the outgoing route determination unit 27 determines the outgoing route gh from the routing table based on the address H of the destination NA unit 21, and the message reaches the destination node device H at address H.

Note that setting LNI=0 may be performed by the node device at address F or the specific device 31. When the node device at address F performs the message, the node device at address F needs to have a processing unit that determines whether or not the message comes from the specific device 31; A release section for interconnection display is required.

As explained above, each data communication network commonly uses a specific device that uniquely assigns an address to a connected node device and performs routing using that address. Between node devices in a data communication network, you can easily determine the outgoing route to the destination data communication network from the interconnection display without adding or changing items in the routing table held by each node device. can send and receive. If a public packet-switched network is used as the specific device, it will be possible to interconnect all data communication networks, which will have a great effect, since the public packet-switched network is intended to be available to anyone from a wide area.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing two independent data communication networks, FIG. 2 is a diagram showing an example of the structure of a message used in this invention, and FIGS. 3 and 4 are processes used in a node device in this invention, respectively. FIG. 5 is a block diagram showing an example of the mechanism, FIG. 5 is a diagram showing an example of the configuration of a data communication network for explaining the present invention, and FIG. 6 is a diagram explaining a specific example of the data transmission processing procedure in FIG. 5. be. 11, 14: independent data communication network, 12: data line, 13: node device, 15: interconnection display section, 16: addressing section of node device connected to and given by specific device, 19: node device address designation part, 23: control information, 2
4: Data, 25: Interconnection determination unit, 26: Specific device output route storage unit, 27: Output route determination unit, 28:
Message transmission unit, 29: matching processing unit, 31: specific device.

Claims (1)

[Claims] 1 A specific device that assigns a unique first address to the connected node device and routes the received message to the destination node device using that first address is commonly used, and within the data communication network, the first In a plurality of mutually independent data communication networks in which a unique second address is assigned to each node device in addition to the address, the message to be sent includes the address storage section 1 of the first address, the address storage section 2 of the second address, and different data. An interconnection display unit is provided to indicate whether or not a message is to be sent between node devices of a communication network, and when a message is transmitted from a node device in one data communication network to a node device in another data communication network,
The originating node device stores the first address assigned by the specific device of the node device in the terminating data communication network connected to the specific device on the communication path leading to the terminating node device in the terminating side section of the address storage unit 1. setting, set the second addresses of the node devices on the originating side and the receiving side in the address storage section 2, display the interconnection display on the interconnection display section and send the message, and the interconnection will be established within the data communication network on the originating side. The specific device is routed based on the display, the mutual connection display is canceled on the specific device or the node device connected to it, and the second node device on the destination side is
An interconnection method for data communication networks characterized by routing based on addresses.