OC-1, OC-3, OC-12, OC-24, OC-48

Optical Carrier transmission speeds, used in fiber optic networks conforming to SONET standard.

OC-1 is 51.85 Mbps.

Higher levels are multiples of that speed (i.e. OC-3 transmits 155,000,000 bits per second ,which equals 3 x 51.84 Mbps).
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