Why is Cat 5 cable only specified up to 100Mhz, if it's to be used for 100BASE-TX, which surely contains frequencies much higher than 100Mhz?
Likewise, why is Cat 6A only specified to 500Mhz, but is suitable for 10GBASE-T?
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asked Jul 27, 2017 at 22:42
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1\$\begingroup\$ Some useful links: Ethernet physical layer, Ethernet over twisted pair, Physical Coding Sublayer, and lastly PAM. \$\endgroup\$– Aaron D. MarascoCommented Jul 27, 2017 at 23:09
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1\$\begingroup\$ And also Cat 5 cable 100Mhz bandwidth meaning \$\endgroup\$– Tom CarpenterCommented Jul 27, 2017 at 23:11
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3\$\begingroup\$ In summary: 100MHz for Cat 5 is what the spec says it needs to be. For 100BASE-TX 31.25MHz is the worst case bandwidth requirement for MLT-3 (the signalling scheme used). \$\endgroup\$– Tom CarpenterCommented Jul 27, 2017 at 23:14
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