I'm not sure where they got that number from, but when the two cables were put there many years ago the stated capacity at that time was 40Gb/s for each of the

I'm not sure where they got that number from, but when the two cables were put there many years ago the stated capacity at that time was 40Gb/s for each of the cables (though that capacity was not meant to be used at full back then). Source: I worked on the network setup that was going to be used by NASA. (The main funding of this cable was not NASA, but in any case it was used by NASA to replace a much slower and more complicated satellite link)