Multiplex communications – Wide area network – Packet switching
Patent
1993-11-01
1995-08-08
Hsu, Alpus
Multiplex communications
Wide area network
Packet switching
370 853, 370 943, 3701051, 370108, 370112, 34082502, 455 383, 455343, 375214, 375219, 375257, 375354, H04B 138, H04J 306, H04L 700
Patent
active
054405564
ABSTRACT:
A data communication system, such as a local area network, is provided with a capability of transmitting isochronous data. 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. The arriving data is de-multiplexed at the hub into separate channels for handling the separate streams by appropriate hardware. When no calls are in progress, a low power mode enables two ends of a network link to reduce power consumption by transmitting a single pulse once every 125 microseconds in lieu of transmitting an entire cycle template. Synchronization while in low power mode allows circuitry at both ends of a network link to remain synchronized to a single reference clock.
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Edem Brian C.
Evans Michael S.
Worsley Debra J.
Hsu Alpus
National Semiconductor Corporation
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