Reasonable Optical Near Joint Access RONJA "Ronja is an open source project for reliable DIY optical data links with a current range of 1.4km and a communication speed of 10Mbps full duplex." All the schematics, guides and tutorials are available on the site. Simply put, it's an IR port on steroids. The transmitter is an IR LED, focused through a concave lens, and the receiver is basically a telescope (with a 1 pixel resolution, but hey, nobody's perfect ). You need one of each on both sides, and since both are encased in plastic/metal tubes, the whole setup looks like a dual missile launcher mounted on your balcony (also, cue the "with RONJA, the Internet really is a series of tubes" jokes). The original designs are somewhat exaggerated, to make the setup withstand the elements, pigeons, earthquakes and the occasional meteorite strike, but I'm sure you could tone it down a bit for your personal use. The device itself acts like a router. Plugs into either the Ethernet or the USB port, depending on the version. The setup consists of one device at each end, and you need direct line of sight between them, although you can use a mirror to go around corners Or, you could set up a repeater/hub at a central location. But be ye warned, down that road madness lies. Madness Tubes all over the place!!! The real series of tubes. Discuss.