(15.02.2011) The engineers say that a focal point of the attack was an imposing building at 26 Ramses Street in Cairo, just two and a half miles from the epicenter of the protests, Tahrir Square. At one time purely a telephone network switching center, the building now houses the crucial Internet exchange that serves as the connection point for fiber-optic links provided by five major network companies that provide the bulk of the Internet connectivity going into and out of the country.