On 11 November 1999, TIA committee approved Category 5E specifications (Enhanced Category 5). This standard is planned to be published under the name ANSI/TIA/EIA-568-A-5 and specifies minimum return loss, propagation delay, delay skew, NEXT loss, PSNEXT loss, FEXT loss, ELFEXT loss and PSELFEXT for 100 Ohm 4-pair Category 5E cabling. It also specifies laboratory measurement methods, component and field methods, and computation algorithms over the specified frequency range up to 100 MHz. This standard is especially important for supporting applications that use all 4 pairs in the cable for simultaneous bi-directional transmission like 1000BASE-T Gigabit Ethernet.
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