Method and apparatus for establishing communication in a multi-tone data transmission system
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United States of America Patent
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Sep 17, 1996
Issued Date -
N/A
app pub date -
Feb 28, 1995
filing date -
Jan 20, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
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. The method includes the step of transmitting, using a fast access transmission mode, a communication access request from a selected first remote unit to the central unit during any symbol period. The communication access request includes a unique remote unit identifier associated with the selected first remote unit and is transmitted from the selected first remote unit on at least one unused sub-channel using a modulation scheme that does not require equalization to decode at the central unit. The method further includes the step of allocating at least one sub-channel to the selected first remote unit in response to the communication access request for facilitating upstream communications between the selected first remote unit and the central unit.
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