powersum attenuation crosstalk ratio (wiring) (PSACR)

Powersum Attenuation Crosstalk Ratio (PSACR) is a quality measure for a transmission channel in multipair transmission technology.

The PSACR value is frequency-dependent and is calculated from the difference between Powersum NEXT( PSNEXT) and the attenuation. The higher the PSACR value, the better the transmission characteristics.

The useful range of PSACR is in fact above the attenuation and below the PSNEXT. The values for PSACR depend on the cable quality and thus on the link class. In link class "D", the PSACR value is still 8.9 dB at 100 MHz, in link class "E" it increases to 20.8 dB at the same frequency, and in link class "F" it is 28.6 dB at 250 MHz.