Embodiments of the present invention include an adaptive equalizer system for use in a serial communication link, in which timing information associated with {HEAD ~ the NRZ data} as generated by {TAIL ~ a phase detector} of a CDR circuit of the serial communication link and a frequency pattern of the recovered NRZ data is used to determine whether the NRZ data received over the serial communication link is over equalized or under equalized 
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Embodiments of the present invention include an adaptive equalizer system for use in a serial communication link , in which timing information associated with { HEAD ~ the NRZ data } as generated by { TAIL ~ a phase detector } of a CDR circuit of the serial communication link and a frequency pattern of the recovered NRZ data is used to determine whether the NRZ data received over the serial communication link is over equalized or under equalized
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