ROBERT F KING, MD
Osteopathic Medicine at Ogden Ave, Naperville, IL

5029163, Jul 2, 1991

Mar 18, 1988

7/169687

Phillip C. J. Chao - Naperville IL
Bong S. Choe - Lebanon NJ
Robert C. Fairfield - Randolph NJ
Thomas L. Hiller - Glen Ellyn IL
Robert W. King - Naperville IL
Joel D. Peshkin - Heidelberg Township, Lehigh County PA
Ralph A. Wilson - Wheaton IL

AT&T Bell Laboratories - Murray Hill NJ

H04J 316

370 951

A synchronous protocol data formatter handles all 24-32 channels of a so-called primary rate version of a digital multiplexed interface or ISDN Primary Rates Interface for a communication system. The formatter relieves the host computer of the local area network of some highly specialized tasks, and, at the same time, provides the following augmented capabilities, which exceed those required by the C. C. I. T. T. standard, I. 431: 1. dynamic channel bandwidth allocation can assign arbitrary (even non-adjacent) time slots to create a super channel; 2. a circular interrupt-queue in a shared memory enables the formatter and the host computer of the local area network to interact efficiently in updating and responding to changing conditions; and 3. cyclical redundancy codes can be used on a more flexible basis than theretofore, e. g. , can be generated upon only address and control fields for digitized voice signals, or, in a relay mode, can substitute an existing cyclical redundancy code to guard against memory errors.