<Tr> <Th> Standard </Th> <Th> Impedance (Ω) </Th> <Th> Tolerance </Th> </Tr> <Tr> <Td> Ethernet Cat. 5 </Td> <Td> 100 </Td> <Td> ± 5 Ω </Td> </Tr> <Tr> <Td> USB </Td> <Td> 90 </Td> <Td> ± 15% </Td> </Tr> <Tr> <Td> HDMI </Td> <Td> 95 </Td> <Td> ± 15% </Td> </Tr>

How to calculate the impedance of a transmission line