Starloop communication network and control system therefor

• US 4,491,838 A
• Filed: 07/28/1982
• Issued: 01/01/1985
• Est. Priority Date: 07/28/1982
• Status: Expired due to Term

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: West, Lynn P.
• Primary Examiner(s): BROWN, THOMAS
• Application Number:
  US06/402,654
• Time in Patent Office: 888 Days
• Field of Search: 340/825.5, 340/825.05, 340/825.8, 340/825.16, 340/825.79, 340/825.83, 371/11, 370/13, 370/14, 370/16, 370/42, 370/54, 370/58, 370/62, 370/79, 370/86, 370/88, 179/2 R, 179/2 DP, 179/22
• US Class Current: 370/407
• CPC Class Codes: G06F 15/17343 wherein the interconnection is dynamically configurable, e.g. having loosely coupled nearest neighbor architecture reconfigurable processors arrays G06F15/7867
• CPC Class Codes: H04L 12/00 Data switching networks interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F13/00
• CPC Class Codes: H04L 43/0817 by checking functioning
• CPC Class Codes: H04L 43/0823 Errors, e.g. transmission errors
• CPC Class Codes: H04L 43/50 Testing arrangements

Abstract

A starloop communication network for intraestablishment communication in a multiterminal processing system includes a digital switch as its central terminal. In the basic mode, the switch is configured so that the input from each terminal is switched back to the next terminal forming a loop network. A central processor in the network need only service the output of the first terminal on the loop and the input from the last terminal. The digital switch includes a port connected to monitor activity on the loop. In the event of a failure, the monitor can determine the failing terminal in the loop by use of a binary search around the loop. The failing terminal will be detected by the monitor and automatically isolated from the loop by the digital switch. The communication network may also be configured to include a plurality of terminal devices of equal performance and intelligence, i.e. a plurality of central processors.

Claims

1. A starloop communication system comprising in combination:

a plurality of terminals,

a central processing unit, and

a starloop controller including a digital switch and a switch controller operable to selectively connect said terminals to said central processing unit or to each other, said digital switch and said switch controller including means for connecting a first one of said terminals to an output port of said central processing unit for receiving messages from said central processing unit, means for sequentially connecting a first portion of said plurality of terminals into a loop network for transferring messages from said central processing unit and between ones of said terminals, means for connecting a last one of said first portion of said terminals in said loop network to an input port of said central processing unit for transferring messages from said terminals to said central processing unit,

said starloop controller also including means for monitoring said loop network for continuity of exchange of messages between said terminals and

said digital switch and said switch controller being operable to modify said loop network to exclude ones of said terminals detected by said means for monitoring as failing to maintain said continuity of exchange,

said digital switch and said switch controller being further operable to connect a second portion of said terminals into a star network.

2. The starloop communication system of claim 1 wherein said digital switch and said switch controller include means for connecting said first portion of said plurality of terminals and said central processing unit into multiple loop networks.

3. The starloop communication system of claim 1 wherein said digital switch and said switch controller are operable to connect a third portion of said terminals into a multidrop network.

4. The starloop communication system of claim 3 wherein said digital switch and said switch controller include means for receiving terminal requests for reconfiguration of one of said loop, star, or multidrop networks and means for automatically reconfiguring said one of said networks in accordance with said received requests.

5. The starloop communication system of claim 1, or claim 2, or claim 3, or claim 4, wherein said terminals are peers of said central processing unit.

6. A starloop communication system comprising in combination:

a plurality of terminals,

a central processing unit,

a starloop controller including a digital switch, a switch controller, and a monitor, wherein said digital switch and said switch controller are operable to connect said central processing unit and a first portion of said plurality of terminals into a loop network configuration and, with said monitor, automatically isolate terminals from said loop network configuration detected as failing to maintain a continuity of exchange of messages therein,

said starloop controller also being operable to connect said central processing unit and a second portion of said plurality of terminals into a star network configuration, and

said starloop controller also being operable to connect said central processing unit and a third portion of said plurality of terminals into a multidrop network configuration.