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IEEE 802.12
The IEEE 802.12 standard is based on a 100-Mbps proposal promoted by AT&T, IBM, and Hewlett-Packard. Called 100VG-AnyLAN, the network is based on a star-wiring topology and a contention-based access method whereby devices signal the wiring hub when they need to transmit data. Devices can transmit only when granted permission by the hub. This standard is intended to provide a high-speed network that can operate in mixed Ethernet and Token Ring environments by supporting both frame types.