Reduced SNR handshake signaling in ADSL systems
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United States of America Patent
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Issued Date -
Jul 22, 2004
app pub date -
Jul 25, 2003
filing date -
Jul 25, 2002
priority date (Note) -
Abandoned
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Abstract
In an asynchronous digital subscriber line (ADSL) system comprising a central office ADSL Terminating Unit (ATU-C) in bi-directional overlap spectrum discrete multitone (DMT) communication with a remote ADSL Terminating Unit (ATU-R), a method is provided in accordance with the present invention. The method comprises the step of transmitting a first handshake tone at either a first DMT tone or a second DMT tone based at least in part on a distance between the ATU-C and ATU-R. In one embodiment, the first handshake tone is transmitted at the first DMT tone when the distance between the ATU-C and ATU-R is less than 6.2 kilometers and the first handshake tone is transmitted at the second DMT tone when the distance between the ATU-C and ATU-R is greater than or equal to 6.2 kilometers.
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