Method and apparatus for enabling a local area network controller circuit to automatically select 10Base -T port data if the 10Base-T port data satisfies the IEEE 802.3 standard Link Test Pass requirement, and if the Link Test Pass indicates that the 10Base-T data is invalid, the controller switches...http://www.google.com/patents/US5469437?utm_source=gb-gplus-sharePatent US5469437 - Network chip with auto sensing and reconfiguration
