Patents Examined by Bob A. Phunkuch
  • Patent number: 6295281
    Abstract: Symmetric flow control in a buffered repeater having responsiveness to flow control frames. An Ethernet full duplex buffered repeater according to the present invention includes an internal arbitration mechanism allowing receive FIFOs of respective receive ports to transmit data over a local bus to remaining transmit ports in round-robin fashion. The transmit ports take the transmitted data off the local bus and transmit it over the respective link. Each transmit port monitors the capacity of an associated transmit FIFO, and when the available capacity falls below that required to store a maximum size frame, asserts an open collector output signal monitored by each of the ports. No port initiates transmission of a packet over the local bus when this signal is asserted. Rather than one of the transmit ports risking being unable to store a complete frame once transmission has begun, the local bus is suspended before the next frame is put on the local bus.
    Type: Grant
    Filed: May 16, 1997
    Date of Patent: September 25, 2001
    Assignee: 3Com Corporation
    Inventors: Frank A. Itkowsky, James S. Hiscock, Cary B. Robins