Mark Alan Dempsky, 661724 Falmouth Dr, Plano, TX 75025

4878048, Oct 31, 1989

Aug 10, 1988

7/230641

Jeffrey L. Gottesman - Morris Plains NJ
Mark A. Dempsky - Glendale Heights IL
Donald E. Koch - Aurora IL
Dev R. Rattan - Chicago IL

Rockwell International Corporation - El Segundo CA

H04K 100

340825010

A channel redundancy system for use with a central office connected to a remote location. A central office terminal at the central office has a plurality of channel units including at least one spare channel unit. A remote terminal at the remote location also has a plurality of channel units including at least one spare channel unit. The channel units in the remote terminal are correspondingly associated with the channel units in the central office termimal. From a repair service bureau located remote from both the central office and the remote location in a defective channel unit can be identified and replaced by the spare channel unit.

4707782, Nov 17, 1987

Sep 7, 1984

6/648869

Steve Dumbovic - Elmhurst IL
Mark A. Dempsky - Villa Park IL

Illinois Tool Works Inc. - Chicago IL

G06F 1322

364200

A method for effecting full duplex communications through a plurality of ports of a processing apparatus having one timer. Each output and input signal is expressed as a plurality of bit time intervals. The timer is operated to establish cycles of duration equal to the bit time interval with each of the cycles being divided into sub-bits; designating one of the sub-bits within each of the cycles as a transmitting sub-bit and, upon commencement of the transmitting sub-bit, latching the output pins of appropriate ports at a signal level indicating an output signal bit for transmission at such ports and, upon completion of that latching, interrogating all of the ports for presence of an input signal; upon commencement of sub-bits other than a transmitting sub-bit, interrogating all of the ports for presence of input signals; designating sub-bits of a first cycle during which presence of an input signal is detected as initial sub-bits and identifying sub-bits immediately succeeding initial sub-bits as confirming sub-bits on a port-by-port basis; recognizing input signals detected during confirming sub-bits as true input signals and tagging ports at which true input signals are detected as true input ports; after such tagging, effecting selective interrogation of true input ports in subsequent cycles during sub-bits appearing in a sequential order corresponding to the confirming sub-bits in the first cycle, which selective interrogation of each of the true input ports continues until the input signal at respective true input ports ceases.