Patent ID: 7426235

Claim:
A method for equalizing a high-speed serial data stream, comprising: receiving, at a receiver, a low frequency tone from a transmitter to enable the receiver to determine a first signal level with little to no attenuation; determining a highest signal magnitude value for x samples of the low frequency tone; receiving a high frequency tone; determining a highest signal magnitude value for y samples of the high frequency tone; determining a ratio of the highest signal magnitude of the low frequency tone to the highest signal magnitude of the high frequency tone; producing the ratio to a transmitter of a remote transceiver, the transmitter including an equalizer that adds pre-emphasis based upon the ratio; sampling the high frequency tone at a first and a second specified sample rate for the high frequency tone; for each sample, determining if the sampled signal has a higher signal magnitude than a previously stored signal magnitude and, if so, storing the signal magnitude value; and wherein the high frequency tone comprises a frequency that is approximately equal to one half of a specified bit rate of a high bit rate serial data stream.