TAT-12/13
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TAT-12/13 were AT&T's 12th and 13th transatlantic telephone cables, in operation from 1996, initially carrying 2 x 5 Gbit/s.
This was the first TAT cable to use a ring structure, involving two stretches of cable across the ocean floor, which explains why two numbers (12 and 13) were used. All later cables also use a ring structure, but only use one number (TAT-14 etc.).