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    11.
    发明专利
    未知

    公开(公告)号：DE69330660T2

    公开(公告)日：2002-07-04

    申请号：DE69330660

    申请日：1993-05-13

    Applicant: IBM

    Inventor： ROUSE GERALD LAVELLE

    IPC: G06F13/00 ,  H04L1/16 ,  H04L29/06 ,  H04L29/08 ,  H04L1/18 ,  H04L12/56

    Abstract: A system and method are provided for controlling the transmission of frames or packets of data in a serial network which allows out-of-order delivery. The data frames transmitted by an initiator node to a recipient node include frame serial number or sequence count information. Acknowledgment frames, transmitted by the recipient node to indicate delivery of the data frame or packet, include matching serial number or sequence count information. According to a preferred embodiment of the present invention, the initiator node and recipient node include resources which relate the serial number or sequence count information, resources which include control information in the acknowledgment frame, and resources which determine the transmit status of all acknowledgment frames prior to that specified by serial number or sequence count in the acknowledgment frame. The status information is used at the initiator node to update the status of any data frames whose acknowledgment has not been received as a consequence of an out-of-order delivery to the recipient, a delay in processing by the recipient, a delay of the acknowledgment frame in the transmission back to the initiator node, or a complete loss of the acknowledgment frame.

    13.
    发明专利
    未知

    公开(公告)号：DE69027342T2

    公开(公告)日：1996-12-05

    申请号：DE69027342

    申请日：1990-01-10

    Applicant: IBM

    Inventor： MATHIS JOSEPH RICHARD ,  ROUSE GERALD LAVELLE

    IPC: H04L29/08 ,  H04L29/06

    Abstract: The present invention relates to a two-directional data communications system comprising a first device (12) for transmitting and receiving data, a second device (14) for transmitting and receiving data, and communications links (16, 18) coupled to the first and second devices for transferring data therebetween. According to the invention the communications system is characterised in that the first device comprises means for establishing a communications link over the communications system and for subsequently transferring data to the second device over the link and the second device comprises means for transferring, using the same communications link, a data transfer direction turnaround message to the first device and means for subsequently transferring data to the first device.

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