Multiplex communications – Wide area network – Packet switching
Patent
1994-04-12
1996-04-09
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 943, 370112, 370 67, H04L 1244
Patent
active
055068464
ABSTRACT:
A data communication system such as a local area network or a wide area network capable of transmitting isochronous data. The system conveys both isochronous data and non-isochronous data by time multiplexing data into a recurring frame structure on a 4-bit nibble basis. The arriving data is de-multiplexed at a hub into separate channels which are forwarded to separate hardware appropriate for handling the particular data stream. The data is passed hierarchically from a source, through a node, and to a hub. The hub places the data into an internal connection memory for switching onto a high bandwidth bus for distribution to other destination hubs, nodes, or sinks, except, where the source node and destination node are attached to the same hub, the hub provides a local loopback to the destination node, thus avoiding the need to place the transmitted data onto the bus. This system conserves room on the bus for other isochronous and non-isochronous data.
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Edem Brian C.
Evans Michael S.
Worsley Debra J.
National Semiconductor Corporation
Nguyen Chau T.
Olms Douglas W.
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