When approved in 2000, SAm-1 was to consist of four fiber pairs initially operating at 40 Gbit/s in a self-healing ring configuration, expandable to 48 channels at 10 Gbit/s each, for a total design capacity of 480 Gbit/s, and with multiple upgrade capability using dense wavelength-division multiplexing up to 1.92 terabits per second.[1][2]