alien far end crosstalk (AFEXT)

With the extensions of the frequency range for data cables and link classes according to ISO class"Ea" and "Fa", or Cat 6a, in addition to all known cable parameters such as Near End Crosstalk( NEXT), Powersum NEXT ( PSNEXT), Attenuation to Crosstalk Ratio ( ACR), Powersum ACR( PSACR), Equal Level Far End Crosstalk( ELFEXT) etc., new cable parameters are to be measured. new cable parameters are also measured, namely Alien Near End Crosstalk( ANEXT) and Alien Far End Crosstalk (AFEXT).

ANEXTand AFEXT describe the crosstalk from adjacent cables onto a data cable, at the beginning and end of the cable, with AFEXT representing the end of the cable. This cable parameter plays an essential role for the transmission of high-speed technologies such as 10 Gigabit Ethernet because of the increased frequencies, which reaches up to 1 GHz at the International Standards Organization (ISO) "Fa".