OC-3 = Optical Carrier 3. The Synchronous Optical Network (SONET) includes a set of signal rate multiples for transmitting digital signals on optical fiber. The base rate (OC-1) is 51.84 Mbps. OC-3 has the rate of 3 51.84 = 155.52 megabits per second, which matches STS-3. This is the size of the largest Internet backbone providers networks.
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