Originally Posted by Tennisbum
In other words, can I use my US ethernet cable with a modem in Europe? Or, like phone cables and power plugs, is some sort of adapter required?
Modern Ethernet connectors, similar to phone cords but with 8 wires, are a worldwide standard called RJ45. But you won't have much luck using one with a modem, unless you mean a cable or DSL modem.
:-)