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PSACR and NEXT are the two major critical measurement to determine CAT6E cable perform. PSACR: Power Sum Attenuation over Crosstalk . the difference between Attenuation and crosstalk, measured in dB, at a given frequency. This is required to assure that signal sent down a twisted pair is stronger than any intereference signals imposed on that same pair by crosstalk from other pairs. It is crucial to have PSACR greater than zero (> 0) at certain frequency, if it become negative, that means the signal transmitting is not 100% secured at that frequency. As the table shows, iCAT-ITS™ has the highest PSACR than any other cable. NEXT(Near End Cross Talk; Headroom) Catalog: Per each cable manufacturers’ catalog and/or spec sheet. NEXT Tested Value: The actual test result of NEXT on each of the cable.