Power sum NEXT and ELFEXT
(PSNEXT, PSELFEXT) represent the addition of crosstalk noise from each group of three pairs onto the fourth pair.
The parameters that are tested for CAT 6 are the same as for Enhanced CAT 5, except that the performance limits of attenuation, pair-to-pair NEXT, power sum NEXT, ELFEXT
, power sum ELFEXT
and return loss, are more stringent, and the testing frequency range of CAT 6 is 250 MHz--more than twice that of enhanced 100 MHz.
Glossary ATM asynchronous transfer mode ELFEXT
equal level far-end crosstalk FEXT far-end crosstalk ISDN integrated services digital network ISO International Organization for Standardization LAN local area network NEXT near-end crosstalk OSI open systems interconnection OTDR optical time domain reflectometer POTS plain old telephone service PSELFEXT power sum equal level far-end crosstalk PSNEXT power sum near-end crosstalk TDR time-domain reflectometer TIA Telecommunications Industry Association UTP unshielded twisted pair WAN wide area network
The LT 8600 is a high-performance tester that has Level III accuracy, two-way return loss, power sum NEXT, ACR & ELFEXT
, and identification of distance-to-fault tests.
When used with next-generation cable, Giga-Channel provides channel performance exceeding proposed Category 6 requirements, including power sum NEXT, power sum ELFEXT
, attenuation, and return loss.