Multiplex communications – Wide area network – Packet switching
Patent
1993-11-01
1996-10-15
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 943, 3701101, H04J 314
Patent
active
055661696
ABSTRACT:
A data communication system, such as a local area network, is provided with a capability of transmitting isochronous data. Preferably the system conveys both isochronous data and non-isochronous data by time-multiplexing the data into a recurring frame structure on a four-bit nibble basis. An efficient encoding scheme permits transmission of both isochronous and non-isochronous data over existing media, such as twisted pair, without degrading bandwidth previously achieved for non-isochronous data over the same media, such as using an ethernet system. Bandwidth available for a particular isochronous source/sink is selectable and sustainable with a predefined granularity. The arriving data is de-multiplexed at the hub into separate channels for handling the separate streams by appropriate hardware. Preferably, the present invention can be implemented in a fashion that is transparent to already-installed media access controllers. Preferably, some components of the system can detect the frame-transmission capability of other components and, if such capability is lacking, can fall back to a mode compliant with existing capabilities.
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Edem Brian C.
Rangan Geetha N. K.
Thaik Richard
Worsley Debra J.
National Semiconductor Corporation
Nguyen Chau T.
Safourek Benedict V.
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