Patents by Inventor Jan K. Pachl

Jan K. Pachl has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Control mechanism for a ring communication system
    Patent number: 4566098
    Abstract: The invention provides a ring communication network having an improved error recovery mechanism. The system uses a token or toggle signal which does not have an inherent control value but one that requires the values of a contiguous pair thereof to control access to the transmission medium of the system. A station recognizes that the ring is idle if the present value of the toggle signal is the same as the value of the toggle signal in the previous frame. Conversely, a station recognizes that the ring is busy if the present value of the toggle signal is different from the value of the toggle signal in the previous frame. A station that detects an idle toggle signal and wishes to transmit data on the communication ring changes the value of the toggle signal to that which corresponds to a busy status and transmits its data.
    Type: Grant
    Filed: May 14, 1984
    Date of Patent: January 21, 1986
    Assignee: Northern Telecom Limited
    Inventors: Neil D. Gammage, Jan K. Pachl, Liam M. Casey