Jan A Janku

US Patent:

55131921, Apr 30, 1996

Filed:

Aug 28, 1992

Appl. No.:

7/937467

Inventors:

Jan A. Janku - Atherton CA
Maarten Pranger - Morgan Hill CA

Assignee:

Sun Microsystems, Inc. - Mountain View CA

International Classification:

G06F 1110

US Classification:

371 501

Abstract:

A fault tolerant, magnetic disk drive array with error detection and correction. The present invention performs vertical parity checks and one or two additional diagonal parity checks on a data stream as it is read into a disk drive array. The results of these "read-in" parity checks are stored in either two or three redundant disk drives. Upon read out of the data stream from the disk drive array, similar "read-out" parity checks are performed on the data. Based upon a comparison of the "read in " and read "out" vertical and diagonal parity checks, corrupted data can be detected and corrected.

US Patent:

49028812, Feb 20, 1990

Filed:

Jun 10, 1988

Appl. No.:

7/205237

Inventors:

Jan A. Janku - Atherton CA

Assignee:

Faxplus Corporation - Santa Clara CA

International Classification:

G06F 708

US Classification:

235381

Abstract:

A communications terminal and network of such terminals offering simultaneous real time or delayed document and voice services through a host processor with overall control, including accounting functions based upon credit card billing. Document services include facsimile, copying, electronic mail and document storage. Voice services include voice mail, and telephone. Real time document handling is achieved using a high speed coprocessor to implement a data compression-decompression algorithm. A pair of common communications channels, such as public telephone subscriber network lines, allow connection of the terminal to a hub. A plurality of interconnected hubs allow wide area availability of document and voice communication services.