Ethernet Physical Layer Transceiver with Auto-Ranging Function
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United States of America Patent
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Issued Date -
Oct 1, 2009
app pub date -
Apr 1, 2008
filing date -
Apr 1, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method in an Ethernet physical transceiver device for selecting a transmission speed includes resetting a first register and a count value, establishing a link with a remote network device at a first transmission speed, incrementing the first register to a first value, monitoring the link by counting the number of detected false carrier events in the incoming transmission as the count value, and at the expiration of a first time period, comparing the count value of false carrier events to a predetermined threshold. The method continues with reducing the first transmission speed when the count value exceeds the predetermined threshold, maintaining the first transmission speed when the count value is less than the predetermined threshold, and when the first register has a first value, incrementing the first register to a second value and repeating the steps of monitoring the link to reducing the first transmission speed.
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