sorry Nikky.... ja sam matori po sjećanju napisao ali se odnosilo na max brzinu standarda USB 2.0 od 480Mbps bakrenim vodičem (bez obzira na upredenost) jer brzina elektrona kroz vodič ograničava na max 5m . Nemoj se čuditi jer baš i nisam sa engleskim na "ti"
"USB 2.0 provides for a maximum cable length of 5 meters for devices running at high speed (480 Mbit/s). The primary reason for this limit is the maximum allowed round-trip delay of about 1.5 μs. If USB host commands are unanswered by the USB device within the allowed time, the host considers the command lost. When adding USB device response time, delays from the maximum number of hubs added to the delays from connecting cables, the maximum acceptable delay per cable amounts to 26 ns. The USB 2.0 specification requires that cable delay be less than 5.2 ns per meter (192000 km/s, which is close to the maximum achievable transmission speed for standard copper wire). "
https://en.wikipedia.org/wiki/USB#Cabling