Multiplex communications – Wide area network – Packet switching
Patent
1993-12-30
1996-09-03
Lee, Thomas C.
Multiplex communications
Wide area network
Packet switching
395821, 395853, 370 91, 370 941, 3642362, 3642383, 3642392, 364DIG1, G06F 1300, G06F 1312
Patent
active
055533027
ABSTRACT:
An Input/Output (I/O) subsystem is provided for transferring frames containing frame control data from a serial data transfer medium to a parallel storage medium. The subsystem includes independent components for processing different portions of the received character stream. The subsystem includes a sequence recognition mechanism for receiving and identifying any of a plurality of digital data bit sequences. The sequences represent channel status information from the data transfer medium. The sequence recognition mechanism provides an interrupt signal derived from the sequences. A frame recognition mechanism responds to the interrupt signal. The frame recognition mechanism receives and identifies a start-of-frame delimiter or an end-of-frame delimiter from the data transfer medium. The frame recognition mechanism provides a frame status signal. A frame receiving mechanism responds to the frame status signal. The frame receiving mechanism receives and identifies a frame header from the data transfer medium. The frame receiving mechanism also verifies link and device level I/O protocol compliance asynchronously while any user defined data included in the frame are being received. The frame receiving mechanism also stores the user defined data in the parallel storage medium concurrently with the verification, if any user defined data are included.
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Cavanagh, Jr. Edward T.
Morrissey Douglas E.
Ng Kin H.
Oldham William E.
Wieder Gene T.
Lee Thomas C.
Luu Le Hien
Unisys Corporation
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