View our coverage map and see where you can get High Speed Internet up to Gbps with AT T Fiber..OEC Fiber Zone Map Our zone map below shows the OEC service territory and where OEC Fiber services are now available. The green zones below are just the start we will continue to open zones in all areas of our territory to eventually serve all OEC members and other subscribers along the way..TeleGeography’s free interactive Submarine Cable Map is based on our authoritative Global Bandwidth research, and depicts active and planned submarine cable systems and their landing stations. Selecting a cable on the map projection or from the submarine cable list provides access to the cable’s profile, including the cable’s name, ready for service RFS date, length, owners, website .AT T Internet offers internet service across states with the greatest coverage in California, Texas, and Florida. DSL internet from AT T Internet is available to an estimated . million people, making it the nd largest residential DSL provider in the U.S. by coverage area In addition to DSL broadband, AT T Internet also offers fiber and fixed wireless internet service..