Harris Corporation

Raymond R Glenn

Joseph Bibb Cain

David Monroe Bell

Andrew T Powshok

Robert S Padgett

Gautam H Thaker

Pedro Uriarte

A local area network employs a shared control channel over which control messages between frequency agile modems for each of the user nodes of a distributed architecture-configured network are exchanged. In addition to the shared control channel, a plurality of data channel pairs is available for effecting full duplex communications between any two nodes of the network. Because all data channel assignments depend upon successful use of the control channel, a prescribed control channel contention access scheme is employed to optimize use of the control channel by all users of the network irrespective of the demand for its use. Pursuant to this scheme, each requesting node must first compare an accumulated activity measure with a traffic density threshold that is continuously optimized for the current level of control channel activity. Unless the accumulated measure is less than the threshold, the requesting user node is temporarily forbidden access to the control channel by a period of time designed to reduce traffic to the optimal level.

Switched point-to-point local area network control mechanism

In multiprocessor systems, and especially in multiprocessor emulation systems, time alignment between the individual processors is accomplished by using a time window established in a Local Pseudo-Time Accumulator (LPA) at each processor and a time reference hereinafter referred to as Master Pseudo Time (MPT). During the run time, any processor which is within the time frame of the window may continue execution. Any processor which falls behind the window must halt the advance of the Master Pseudo Time untl the processor can execute long enough to move back into the window. Any processor which moves ahead of the window must enter an idle state until the Master Pseudo Time advances enough for the processing element to move back into the window.

Multi-processor time alignment control system

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Palm Bay, FL, United States of America

Raymond R Glenn