PSACRPower Sum Attenuation to Crosstalk Ratio
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The cable also performs with a positive PSACR beyond 400 MHz.
In late 1997, the International Organization for Standardization (IOS or ISO) proposed the Class E/Category 6 system, which would provide the power sum ACR (PSACR) performance at 200 MHz that Category 5 provides at 100 MHz.
Measurements include Wiremap, Propagation Delay, Delay Skew, Length, Attenuation, NEXT, PSNEXT, ACR, PSACR, ELFEXT, PSELFEXT, Return Loss, and Resistance.