Browse Prior Art Database

Crosspoint Switch for ATS

IP.com Disclosure Number: IPCOM000088754D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Lilie, MI: AUTHOR [+3]

Abstract

This article describes a muiticomputer, multiterminal system which is interconnected by a crosspoint switch. Any one of the computers in the system may function as the host computer upon request. Any terminal requesting access to the computer system requests access to a particular computer, rather than having the host computer make the decision as to which one of the computers the requesting terminal is connected to.

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Crosspoint Switch for ATS

This article describes a muiticomputer, multiterminal system which is interconnected by a crosspoint switch. Any one of the computers in the system may function as the host computer upon request. Any terminal requesting access to the computer system requests access to a particular computer, rather than having the host computer make the decision as to which one of the computers the requesting terminal is connected to.

The system is comprised of a plurality of terminals 2, 4, and 6 which are selectively connected to a plurality of computer ports 8, 10 and 12 by way of a crosspoint switch which includes a terminal to port switch 14 and a port to terminal switch 16. A central clock 18 supplies timing signals to the terminals via lines 20, 22 and 24, and to the computer ports via lines 26, 28 and 30. A controller 32 monitors terminal-to-computer connection requests and disconnections. Intercomputer communication is via line 36. A given computer requests to be the master computer for a certain time span over these lines, and one of its ports is designated as the control port.

System operation is described relative to terminal 2 requesting access to computer port 10. Computer port 8 is assumed to be the designated control port. Throughout the description the understanding is maintained that any terminal could be interchanged with terminal 2, and any port could be either the requested port or the control port.

Terminal 2 transmits a Data Termina...