Q & A on Attenuation in Ethernet Network Design

Q: Another reason for maximum bus segment length it that there is more attenuation and more noice on a long cable, and therefor more bit errors, but I don't think that that is the main reason.

A: Yes, attenuation is a minor design issue -- for a given transmitter power level and type of cable, the signal will only reach a certain distance before becoming too weak to receive realiably. However, if attenuation were a major limitation issue, it could be overcome by more stringent cable requirements or increased transmitter power levels.