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An Overview Of IEEE 802.12 Demand Priority

Spratt, Michael P.; Albrecht, Alan; Curcio, Joe; Dove, Dan; Goody, Steve

HPL-94-17

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Abstract: 100VG-AnyLAN is a Local Area Network developed and standardized by the IEEE 802.12 committee. Demand Priority, the Media Access Control of IEEE 802.12 is a 100 Mb/s hub to end node protocol, but extends to allow multiple hubs to form a single network. Demand Priority supports 2 priority levels, enabling it to support the emerging multimedia applications. This paper describes Demand Priority and how it combines with the physical layers to support a wide range of media types, particularly all IEEE 802.3 10Base-T compliant cabling. The paper also positions Demand Priority relative to FDDI, ATM and higher speed CSMA/CD and outlines potential advantages Demand Priority may have relative to these technologies.

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