Network interconnection device

Claim 2

A network interconnection device connected to first and second networks, comprising: an event table for storing an event identifier for each message communicating in said first network; a message/event converter for converting the message received from said first network into an event based on said event table; and an address converter for changing a destination address of the event which is of said first network and received from said message/event converter to an address of said second network and sending the event to said second network.

Claim 3

The network interconnection device according to claim 1 , which further comprises recording means for recording a type and/or a time of generation of said event output from said message/event converter.

Claim 4

The network interconnection device according to claim 1 , in which said address converter includes an address table for storing an address defined by said second network for each address of the message communicating in said first network, and in which upon receipt of an event from said message/event converter, an address is read from said address table based on the destination address of the event and a destination address of the event is changed to a read address.

Claim 5

The network interconnection device according to claim 3 , which further comprises recording means for recording a type and/or a time of generation of said event output from said message/event converter.

Claim 6

A network interconnection device connected to first and second networks, comprising: an address table for storing an address of said second network for each event identifier; an event table for storing an event identifier for each message communicating in said first network; a message/event converter for converting a message received from said first network to an event based on said event table, said converter outputting said event with an event identifier attached thereto; and means for reading an address from said address table based on an event identifier upon receipt of an event from said message/event converter, and changing an address of the event into a read address.

Claim 7

A network interconnection device connected to first and second networks, comprising: an address table for storing an address of said second network for each event identifier; an event table for storing an event identifier for each message communicating in said first network; a message/event converter for converting a message received from said first network to an event based on said event table, said converter outputting said event with an event identifier attached thereto; and means for reading an address from said address table based on an event identifier upon receipt of an event from said message/event converter, and changing an address of the event into a read address.

Claim 8

The network interconnection device according to claim 5 , which further comprises recording means for recording a type and/or a time of generation of said event output from said message/event converter.

Claim 9

The network interconnection device according to claim 5 , in which said event table stores an event identifier for each destination address of a message communicating in said first network.

Claim 10

The network interconnection device according to claim 7 , which further comprises recording means for recording a type and/or a time of generation of said event output from said message/event converter.

Claim 11

A network interconnection device according to claim 5 , in which said event table stores an event identifier for selected one of the destination address, a source address and contents of the message communicating in said first network, or a combination thereof.

Claim 12

The network interconnection device according to claim 9 , which further comprises recording means for recording a type and/or a time of generation of said event output from said message/event converter.

Claim 13

A network interconnection device for connecting first and second networks of a network system, comprising: a transfer address table for storing a transfer address defined by the second network for each message communicating in said first network; an address converter for changing a destination address of the message received from said first network based on said transfer address table and sending said message to said second network; a time table for storing, for each of other network interconnection devices, a last time point of reception at which a message was received from said other network interconnection devices and a last time point of transmission at which the message was sent to said other network interconnection devices; an alive notification section, based on said time table, for sending an alive notice to said other network interconnection device which did not send a message for a first time period, and updating the last time point of reception in said time table to a present time point; and an address table update section for detecting other network interconnection device which transmits no message for a second predetermined time length based on said time table, and deleting the transfer address corresponding to detected network interconnection device from said transfer address table.

Claim 14

A network interconnection device for connecting first and second networks of a network system, comprising: a transfer address table for storing a transfer address defined by the second network for each message communicating in said first network; an address converter for changing a destination address of the message received from said first network based on said transfer address table and sending said message to said second network; a time table for storing, for each of other network interconnection devices, a last time point of reception at which a message was received from said other network interconnection devices and a last time point of transmission at which the message was sent to said other network interconnection devices; an alive notification section, based on said time table, for sending an alive notice to said other network interconnection device which did not send a message for a first time period, and updating the last time point of reception in said time table to a present time point; and an address table update section for detecting other network interconnection device which transmits no message for a second predetermined time length based on said time table, and deleting the transfer address corresponding to detected network interconnection device from said transfer address table.

Claim 15

The network interconnection device according to claim 11 , in which said transfer address table stores a plurality of transfer addresses for each destination address of a message communicating in the first network.

Claim 16

The network interconnection device according to claim 11 , in which said transfer address table stores a plurality of transfer addresses for any one of the destination address, a source address and contents of a message communicating in the first network or any combination thereof.

Claim 17

A network interconnection device for connecting first and second networks of a network system, comprising: a transfer address table for storing transfer address defined by the second network for each message communicating in said first network; an address converter for changing a destination address of a message received from said first network into the transfer address based on the transfer address table and sending the message to said second network; an update request section for sending an addition request to other network interconnection devices to register a pair of own address and a transfer condition indicating a desired message in the transfer address table of the other network interconnection devices; and an update section for adding the addresses of other network interconnection devices to said transfer address table upon receipt of the addition request from said other network interconnection devices.

Claim 18

A network interconnection device for connecting first and second networks of a network system, comprising: a transfer address table for storing transfer address defined by the second network for each message communicating in said first network; an address converter for changing a destination address of a message received from said first network into the transfer address based on the transfer address table and sending the message to said second network; an update request section for sending an addition request to other network interconnection devices to register a pair of own address and a transfer condition indicating a desired message in the transfer address table of the other network interconnection devices; and an update section for adding the addresses of other network interconnection devices to said transfer address table upon receipt of the addition request from said other network interconnection devices.

Claim 19

The network interconnection device according to claim 14 , in which said update request section sends an addition request to all the network interconnection devices connected to the second network.

Claim 20

The network interconnection device according to claim 14 , in which said update request section sends an addition request to a predetermined network interconnection device, and in which said update section, upon receipt of the addition request, adds an address of the other network interconnection devices to said transfer address table and transfers the addition request to all of said network interconnection devices included in said transfer address table.

Claim 21

The network interconnection device according to claim 14 , in which said transfer address table stores a plurality of transfer addresses for each destination address of a message communicating in the first network.

Claim 22

The network interconnection device according to claim 14 , in which said transfer address table stores a plurality of transfer addresses for any one of the destination address, a source address and contents of a message communicating in the first network or any combination thereof.