OC-12

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OC-12 (Optical Carrier 12) is a fiber optic network line with a SONET rate of 621.84 Mbit/s (payload: 601.344 Mbit/s; overhead: 20.736 Mbit/s) or 12 times the basic SONET signal transmitting rate of 51.84 Mbit/s (OC-1).

OC-12 lines are commonly used by ISPs as WAN connections. While an ISPs backbone wouldn't usually be an OC-12, regional connections certainly could be. This connection speed is also often used for large internet customers, like a web hosting company, or a smaller ISP buying service from a larger one.

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