Cisco Technology, Inc.

Barry K Chan

Michael Boe

A TN3270 server (,) that forwards a,data stream from a Systems Network Architecture (&ldquo;SNA&rdquo;) connection (,) to a Transmission Control Protocol (&ldquo;TCP&rdquo;) connection (,) monitors the TCP connection for segments that acknowledge thereby-transmitted bytes. It also keeps track of the unacknowledged-byte window sizes specified by received TCP-connection -segments. It responds with a pacing response to a pacing-request-containing SNA message only when forwarding of previously received information from the SNA can be completed without resulting in a number of unacknowledged bytes that exceeds the specified window size.

Mapping SNA session flow control to TCP flow control

A TN3270 server (26) that forwards a 3270 data stream from a Systems Network Architecture ('SNA') connection (28) to a Transmission Control Protocol ('TCP') connection (24) monitors the TCP connection for segments that acknowledge thereby-transmitted bytes. It also keeps track of the unacknowledged-byte window sizes specified by received TCP-connection segments. It responds with a pacing response to a pacing-request-containing SNA message only when forwarding of previously received information from the SNA can be completed without resulting in a number of unacknowledged bytes that exceeds the specified window size.

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Beecroft, Australia

Barry K Chan