Apparatus and methods for informing the central unit of the transmission requirements of a remote unit in a bi-directional data transmission system that facilitates communications between a central unit and a plurality of remote units using a frame based discrete multi-tone (DMT) transmission scheme....http://www.google.com/patents/US5557612?utm_source=gb-gplus-sharePatent US5557612 - Method and apparatus for establishing communication in a multi-tone data transmission system
