Multiplex communications – Wide area network – Packet switching
Patent
1991-08-13
1993-08-10
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 60, 370 601, 370 8513, 370 941, H04J 302
Patent
active
052355926
ABSTRACT:
Dynamic switch protocols are implemented on a token bus protocol in a shared medium network to improve the basic token bus functional capabilities and link utilization, and to produce a uniform transaction protocol that supports both token bus and dynamic switch networks. Frame formats common to both token bus and dynamic switch protocols are utilized, and circuit switched protocols are superimposed on a token bus protocol in interlocked and data transmissions to establish a circuit switched path between a token holder sender node and a destination node. An initial frame transmission uses a normal link header and establishes the circuit switched path between the sender node and the destination node. Subsequent data frames contain no link header information, thereby improving transmission efficiency, and the last frame in such a transmission disconnects the switched circuit path, thereby allowing other transmissions to resume. The use of circuit switched protocols within a token bus protocol allows more general transmission sequences and improves the utilization of token bus bandwidth.
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Cheng Ting D.
Franaszek Peter A.
Georgiou Christos J.
Nordstrom Gregory M.
Philips Thomas K.
Hsu Alpus H.
International Business Machines - Corporation
Olms Douglas W.
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