I got tired of renting a modem from Comcast, so finally bought my own. The new modem has just one Ethernet port, which is used to run the Ethernet cable to the Apple Airport Express. Is there a device, like a splitter, that will offer me two Ethernet ports, or should I get a gigabit switch? My son wants to hard wire his xBox 360 to the Ethernet so that he has a stronger signal. Thanks.