The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 05, 1988
Filed:
Dec. 16, 1985
Edwin P Crabbe, Jr, Peoria, AZ (US);
GTE Communication Systems Corporation, Phoenix, AZ (US);
Abstract
This circuit provides for the connection of simplex I/O terminals to duplex processor copies. Each processor copy's configuration provides for a terminal control circuit. These copies of the terminal control circuit are cross connected in order to provide access from each processor to each I/O terminal. Normal operation consists of a particular I/O terminal being operated by one processor copy. If the processor copy corresponding to a particular terminal is faulty or removed from service, that terminal is then automatically cross-connected to the active processor copy and receives output from that processor copy. If one processor copy is out of service, both I/O terminals receive output from the active processor copy. If the I/O terminal which is normally connected to the active processor copy becomes out of service and the other processor copy is out of service, the I/O terminal which is normally connected to the other processor copy will be reconfigured to be connected to the active processor. The active processor will then accept input from the I/O terminal of the other copy as well as transmit output to that I/O terminal.