Asymmetrical transport of data
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United States of America Patent
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Feb 21, 2006
Issued Date -
N/A
app pub date -
Jul 31, 2000
filing date -
May 20, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system is described which provides bidirectional transport of data at different data rates for each direction over a shared medium. In one embodiment, the different data rates are accomplished using different modulation techniques. For example, in the downstream direction, quadrature amplitude modulation (QAM) 64 is used and in the upstream direction orthogonal frequency division multiplexing (OFDM) is used. The QAM 64 modulation provides for a higher number of bits per hertz in a transmission channel. By using QAM 64 modulation, down stream transmission rates on the order of 30 megabits per second (Mbps) in a 6 MHz channel can be achieved. A number of 6 MHz channels can be combined to provide for even higher data rates.
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