PS-ACRPower Sum Attenuation to Crosstalk Ratio
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In reality, what we have is a proposed standard that, technically, meets the original proposal of a system with a positive PS-ACR (power sum-near-end crosstalk) at 200 MHz but one that allows-manufacturers to perform noise cancellation in a proprietary manner.
The performance tests required by the 'Cobra Challenge' are Return Loss, and PS-ACR, two of the most critical characteristics specified by design engineers.