AT&T Submarine Systems, Morristown, NJ, has designated Shirley, NY, as a new landing site when it christens its TAT 12-13 undersea fiber-optic networks in 1996. TAT 12-13 will go into operation at about the same time and will involve two networks built several hundred miles apart. Other landing points will be Green Hill, RI, Penmarch, France and Land`s End, England. Relying on optical amplifier technology, TAT 12-13 will operate at 5 gigabits per second. AT&T is using the two TATs simultaneously, so the two cables can restore each other. All the analog undersea cables that AT&T had in place are retired, and the company has no plans to build another network across the Atlantic.