Cable Length Derating
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The reduction in maximum speed or power capacity as cable length increases beyond the optimal range.
Every cable standard has a maximum length for rated performance: USB4 at 40 Gbps is 0.8m passive, HDMI 2.1 degrades above 3m, and Cat6a maintains 10 Gbps to 100m. Beyond these limits, cables either fail entirely or negotiate down to lower speeds. Active cables and fiber optic solutions extend usable length at added cost.