Patent EP0397188A2 successfully refreshed from Google Patents.
EP0397188A2
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EP
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A bridge apparatus and a communicaton system between networks using the bridge apparatus
Assignee: Hitachi Ltd
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Filing: 1990-05-11
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Granted: —
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Expires: 2010-05-11
Abstract
Abstract Frontend LANs (25) connecting plural stations (251) are connected to plural nodes (10) of a backbone LAN respectively (13). The backbone LAN (13) is constituted by plural physical or logical links, and each node (10) corresponds to each frontend LAN (25). A first data block is segmented into one or plural second data block units of fixed length and transferred to destination nodes, an bridge means is provided in order to assemble the second data blocks into the first data block. The bridge means can transmit the second data blocks to arbitrary links, and the receiving is performed through one link. The bridge means also has means for decoding (1016) whether the learning should be performed or not, based on the learning indication information existing in the second data block including the routing information.
Inventors
- 👤 Osamu Takada
- 👤 Katsuyoshi Onishi
- 👤 Koichi Kimura
- 👤 Kazunori Nakamura
- 👤 Yoshihiro Takiyasu
- 👤 Mitsuhiro Yamaga
- 👤 Kunio Hiyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 15:22
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/46; H04L12/4604; H04L12/4616; H04L45/00; H04L45/74; H04L45/742
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
162 words
A communication system for inter-connecting a plurality of frontend networks with a loop-type backbone network, the communication system comprising: a plurality of logical or physical highways constructing the backbone network; at least one node means connected to the backbone network, said node means including bridge means connected to one of the frontend networks, and switching means for connecting the backbone network and said bridge means; said bridge means having segmenting means for segmenting first data block supplied from the frontend network into second data block to be the backbone network, each of said second data block having a fixed length, means for searching routing information table with station address contained in said first data block, and assembling means for assembling said second data block supplied from the backbone network to said first data block; and said switching means selectively connecting said bridge means to at least one of said highways in order to transmit said second data block to the backbone network.
Claim 2
Dependent Claim
162 words
A communication system for inter-connecting a plurality of frontend networks with a loop-type backbone network, the communication system comprising: a plurality of logical or physical highways constructing the backbone network; at least one node means connected to the backbone network, said node means including bridge means connected to one of the frontend networks, and switching means for connecting the backbone network and said bridge means; said bridge means having segmenting means for segmenting first data block supplied from the frontend network into second data block to be the backbone network, each of said second data block having a fixed length, means for searching routing information table with station address contained in said first data block, and assembling means for assembling said second data block supplied from the backbone network to said first data block; and said switching means selectively connecting said bridge means to at least one of said highways in order to transmit said second data block to the backbone network.
Claim 3
Dependent Claim
41 words
The communication system according to claim 1, wherein said switching means connecting said bridge means to all of said highways in order to transmit said second data block by a broadcast forwarding based on a searching result of said searching means.
Claim 4
Dependent Claim
22 words
The communication system according to claim 1, wherein each of said second data block has learning indicator field and error check field.
Claim 5
Dependent Claim
18 words
The communication system according to claim 1, wherein said node means including a plurality of said bridge means.
Claim 6
Dependent Claim
36 words
The communication system according to claim 4, wherein said switching means connects each of said bridge means to a predetermined one of said highways in order to receive said second data block from the backbone network.
Claim 7
Dependent Claim
203 words
A communication system for transferring data between a plurality of frontend networks with a loop- type backbone network, each of the frontend networks connecting at least one station, the communication system comprising: a plurality of physical or logical highways, said highways constructing the backbone network; a plurality of nodes connected to the backbone network; each of nodes including bridge means corresponding to each of the frontend networks and switching means for selectively connecting said bridge means to said highways; and said bridge means including first converting means for converting first data block having a variable length, destination station address and source station address received from said corresponding frontend network to second data block having a fixed length, error check information and learning indicator information to be transferred to the backbone network, second converting means for converting said second data block transferred from the backbone network to said first data block, and means for searching a routing information table with said destination station address so as to determine at least one of said highways to be connected by said switching means in order to transmit said second data block and for registering routing information including said source station address in said routing information table.
Claim 8
Dependent Claim
203 words
A communication system for transferring data between a plurality of frontend networks with a loop- type backbone network, each of the frontend networks connecting at least one station, the communication system comprising: a plurality of physical or logical highways, said highways constructing the backbone network; a plurality of nodes connected to the backbone network; each of nodes including bridge means corresponding to each of the frontend networks and switching means for selectively connecting said bridge means to said highways; and said bridge means including first converting means for converting first data block having a variable length, destination station address and source station address received from said corresponding frontend network to second data block having a fixed length, error check information and learning indicator information to be transferred to the backbone network, second converting means for converting said second data block transferred from the backbone network to said first data block, and means for searching a routing information table with said destination station address so as to determine at least one of said highways to be connected by said switching means in order to transmit said second data block and for registering routing information including said source station address in said routing information table.
Claim 9
Dependent Claim
45 words
The communication system according to claim 6, wherein said second data block transferred from the backbone network with said error check information thereof, and said searching and registering means execute learning in response to said learning indicator information and an output of said checking means.
Claim 10
Independent Claim
144 words
A method for transferring data between a plurality of frontend networks, each of the frontend networks connecting at least one station, through bridge circuits connected to a backbone network constructed by a plurality of physical or logical loop highways, comprising the steps of: segmenting first data block having a variable length and destination and source station address supplied from one of the frontend networks to second data block to be transmitted to the backbone network, each of said second data block including a fixed data length, control field having learning indicator field, content field and error check code field; searching a routing information table with said destination station address so as to determine at least one of said physical or logical highways in order to transmit said second data block; and registering routing information including said source station address in said routing information table.
Claim 11
Independent Claim
144 words
A method for transferring data between a plurality of frontend networks, each of the frontend networks connecting at least one station, through bridge circuits connected to a backbone network constructed by a plurality of physical or logical loop highways, comprising the steps of: segmenting first data block having a variable length and destination and source station address supplied from one of the frontend networks to second data block to be transmitted to the backbone network, each of said second data block including a fixed data length, control field having learning indicator field, content field and error check code field; searching a routing information table with said destination station address so as to determine at least one of said physical or logical highways in order to transmit said second data block; and registering routing information including said source station address in said routing information table.
Claim 12
Dependent Claim
27 words
The transferring method according to claim 8, further comprising steps of: checking said error check code field of said second data block transmitted from the backbone network.
Claim 13
Dependent Claim
36 words
The transferring method according to claim 9, further comprising steps of: learning said routing information derived from said second data block in response to said learning indicator field thereof and a result of said checking step.
Claim 14
Dependent Claim
112 words
In a communication system in which a plurality of frontend LANs connecting a plurality of stations are connected through a plurality of physical or logical loop highways, the node comprising: loop access control for voluntarily selecting the logical highways to transmit a plurality of backbone LAN cells to another one of the nodes; and bridge means connected between said loop access control means and one of the frontend LANs, said bridge means including converting means for converting a frontend LAN frame received from the frontend LAN to at least one of said backbone LAN cells, each of said backbone LAN cells having a learning indicator field and an error code check field.
Claim 15
Dependent Claim
112 words
In a communication system in which a plurality of frontend LANs connecting a plurality of stations are connected through a plurality of physical or logical loop highways, the node comprising: loop access control for voluntarily selecting the logical highways to transmit a plurality of backbone LAN cells to another one of the nodes; and bridge means connected between said loop access control means and one of the frontend LANs, said bridge means including converting means for converting a frontend LAN frame received from the frontend LAN to at least one of said backbone LAN cells, each of said backbone LAN cells having a learning indicator field and an error code check field.
Claim 16
Dependent Claim
29 words
The node according to claim 11, wherein said learning indicator field has information denoting whether said cell is first or single one of said backbone LAN cell or not.
Claim 17
Dependent Claim
39 words
The node according to claim 1, further comprising: storing/searching means for storing routing information including a set of a station address and a node address, said storing/searching means stores said routing information in response to said learning indicator field.
Claim 18
Dependent Claim
32 words
The node according to claim 13, wherein a plurality of said bridge means are connected to each of said access control means, and said routing information further including a corresponding bridge address.
Claim 19
Dependent Claim
132 words
A communication system between a plurality of stations on a plurality of frontend LANs via a backbone LAN, the communication system comprising: a plurality of physical or logical highways constructing the backbone LAN; bridge means connected to each of the frontend LANs, said bridge means including means for segmenting first block having a variable length provided from the frontend LAN to second data block, each of said second data block having a fixed length, an error check field and a learning indicator field, and re-assembling means for re-assembling said second data block received from the backbone LAN to said first data block; and switching means for voluntarily connecting said bridge means to at least one of said logical highways to transfer said second data block to another one of the bridge means.
Claim 20
Dependent Claim
132 words
A communication system between a plurality of stations on a plurality of frontend LANs via a backbone LAN, the communication system comprising: a plurality of physical or logical highways constructing the backbone LAN; bridge means connected to each of the frontend LANs, said bridge means including means for segmenting first block having a variable length provided from the frontend LAN to second data block, each of said second data block having a fixed length, an error check field and a learning indicator field, and re-assembling means for re-assembling said second data block received from the backbone LAN to said first data block; and switching means for voluntarily connecting said bridge means to at least one of said logical highways to transfer said second data block to another one of the bridge means.
Claim 21
Dependent Claim
37 words
The communication system according to claim 15, wherein said bridge means is connected to all of said phisical or logical highways of the back bone LAN in order to transmit said second data block with broadcast forwarding.
Claim 22
Dependent Claim
34 words
The communication system according to claim 15, wherein said bridge means is connected to only one of said physical or logical highways in order to receive said second data block from the backbone LAN.
Claim 23
Dependent Claim
131 words
In a communication system between a plurality of stations connected to a plurality of frontend networks, each of frontend networks being connected to one of nodes of a backbone network constructed by a plurality of logical or physical loop highways, the node having a routing information table, a method of learning routing information in the node comprising the steps of: segmenting a frontend network frame provided from the frontend network into at least one backbone network cell to be transmitted to the backbone network; searching the routing information table in response to a destination station address contained in said frontend network frame; and selecting at least one of the highways in response to a result of said searching step in order to transmit said backbone network cell to the backbone network.
Claim 24
Dependent Claim
131 words
In a communication system between a plurality of stations connected to a plurality of frontend networks, each of frontend networks being connected to one of nodes of a backbone network constructed by a plurality of logical or physical loop highways, the node having a routing information table, a method of learning routing information in the node comprising the steps of: segmenting a frontend network frame provided from the frontend network into at least one backbone network cell to be transmitted to the backbone network; searching the routing information table in response to a destination station address contained in said frontend network frame; and selecting at least one of the highways in response to a result of said searching step in order to transmit said backbone network cell to the backbone network.
Claim 25
Dependent Claim
180 words
In a communication system between a plurality of stations connected to a plurality of frontend networks, each of the frontend networks being connected to one of a backbone network constructed by a plurality of logical or physical loop highways, in which the node has a table for storing routing information, converts first data block received from the frontend network to one or a plurality of second data block, and transmits the second data block to destinated one of the nodes, a method of learning the routing information in the node comprising the steps of: searching the table with destination station address contained in the first data block received from the frontend network; adding learning indicator information to the second data block, which includes station position information; transmitting said second data block added with said learning indicator information to corresponding one of the highways; receiving said second data block added with said learning indicator information from all of the highways; and registering said station position information containing in said second data block added with said learning indicator information into the table.
Claim 26
Dependent Claim
180 words
In a communication system between a plurality of stations connected to a plurality of frontend networks, each of the frontend networks being connected to one of a backbone network constructed by a plurality of logical or physical loop highways, in which the node has a table for storing routing information, converts first data block received from the frontend network to one or a plurality of second data block, and transmits the second data block to destinated one of the nodes, a method of learning the routing information in the node comprising the steps of: searching the table with destination station address contained in the first data block received from the frontend network; adding learning indicator information to the second data block, which includes station position information; transmitting said second data block added with said learning indicator information to corresponding one of the highways; receiving said second data block added with said learning indicator information from all of the highways; and registering said station position information containing in said second data block added with said learning indicator information into the table.
Claim 27
Dependent Claim
141 words
In a communication system between a plurality of stations connected to a plurality of frontend networks, each of the frontend networks being connected to one of nodes of a backbone network constructed by a plurality of loop-type logical or physical highways, in which each of the nodes has a table for storing routing information, and transfer data between the frontend network and the backbone network, a method of learning the routing information in each of the nodes comprising the steps of: searching the table with destination address contained in the data received from the frontend network; registering a source station position contained in the data received from the frontend network into the table, when a result of the searching step indicates a discarding; and registering the source station position contained in the data received from the backbone network into the table.
Claim 28
Dependent Claim
141 words
In a communication system between a plurality of stations connected to a plurality of frontend networks, each of the frontend networks being connected to one of nodes of a backbone network constructed by a plurality of loop-type logical or physical highways, in which each of the nodes has a table for storing routing information, and transfer data between the frontend network and the backbone network, a method of learning the routing information in each of the nodes comprising the steps of: searching the table with destination address contained in the data received from the frontend network; registering a source station position contained in the data received from the frontend network into the table, when a result of the searching step indicates a discarding; and registering the source station position contained in the data received from the backbone network into the table.
References Cited (Backward Citations)
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