Integrated multimedia network system

• US 5,121,384 A
• Filed: 10/18/1990
• Issued: 06/09/1992
• Est. Priority Date: 10/20/1989
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kodama, Toshikazu, Ozeki, Takeshi
• Primary Examiner(s): Safourek, Benedict V.
• Assistant Examiner(s): Jung, Min
• Application Number:
  US07/599,413
• Time in Patent Office: 600 Days
• Field of Search: 370/94.1, 370/85.12, 370/85.15, 370/60, 340/825.05
• US Class Current: 370/400
• CPC Class Codes: H04L 12/2852 Metropolitan area networks

Abstract

An integrated multimedia network system is constructed by a plurality of transport nodes each having several types of communication media intervened at arbitrary locations in a ring-shaped transmission path. One transport node exchanges communication information of communication media in a fixed-length packet transfer format. The transport node has a packet switcher, which divides packets into plural groups for at least self node and other nodes by switching between media communication packets from the self node and those packets from an adjoining transport node based on header information that indicates their destinations. A group of packet communication information destined to the self node is sent to the associated communication medium. A group of packets for other nodes is time-divisionally multiplexed and is sent on the transmission path. The packet switcher is supplied with a time-divided multiplexing signal from an adjoining transport node to be sent over the transmission path after the signal is time-divisionally separated for each group.

Claims

1. An integrated multimedia network system comprising:

a transmission path formed by at least a single transmission loop; and

a plurality of transport nodes intervened at arbitrary locations of said transmission path and each having several types of communication media for transmitting and receiving of communication information;

said transport nodes each including,

information/packet converting means, provided for each of said communication media, for exchanging said communication information from said communication media in a fixed-length packet transfer format,

packet switching means for receiving packets converted by said information/packet converting means and packets from an adjoining transport node, dividing said packets into plural groups for at least self node and other nodes by packet switching based on header information indicating destinations of said packets, and sending that group of packets which is destined to said self node to associated information/packet converting means,

transmission means for multiplexing, on a time-divisional basis, those groups of packets which are destined to said other nodes and sending said packets on said transmission path,

receiving means for receiving a time-divided multiplexing signal sent via said transmission path from an adjoining transport node and time divisionally separating said time-shade multiplexing signal group by group and sending a resulting signal to said packet switching means;

wherein said packet switching means comprises first switching means and second switching means,

said first switching means receives packets transmitted from said information/packet converting means and packets from said second switching means, divides said packets into plural groups for at least self node and other nodes by packet switching based on header information indicating destinations of said packets, sends those groups of packets which are destined to said other nodes to said second switching means, and sends that group of packets which is destined to said self node to said information/packet converting means, and

said second switching means received a group of packets from said first switching means and a group of packets from said receiving means, sequentially extracts packets from each group, separating said packets into plural groups for at least said self node and said other nodes by packet switching based on said header information indicating destinations, sends those groups of packets which are destined to said other nodes to said transmission means, and sends that group of packets which is destined to said self node to said first switching means.

2. A network system according to claim 1, wherein said second switching means further divides said group of packets from said first switching means and said group of packets from said receiving means into subgroups and executes packet switching in units of said subgroups.

3. A network system according to claim 1, wherein said one of said first and second switching means comprises multiple stages of selfrouting packet switches.

4. A network system according to claim 3, wherein said information/packet converting means has a function to affix priority information to a packet at a time of packet transmission, and

said selfrouting packet switches has a priority control function to perform switching of that packet which has higher priority based on said priority information.

5. A network system according to claim 1, wherein said transmission path is formed by double transmission loops having opposite transmission direction,

said plurality of transport nodes each comprise double systems of transmission means and double systems of receiving means in association with said double transmission loops, and

said one of said first and second switching means has a function to automatically determine which system of transmission means and receiving means should be used in grouping packets in accordance with a distance to a destination.

6. A network system according to claim 5, wherein said plurality of transport nodes each have monitoring means for detecting a trouble on said transmission path, and

said packet switching means has a function to automatically inhibiting packet grouping with respect to that transmission loop which has a trouble and switch grouping to that transmission loop which has no trouble, when said trouble is detected by said monitoring means.