OC-n / OC-xxx indicates Optical Carrier signals which are carried over a SONET (Synchronous Optical Network) fiber optical network. The numbers after OC indicate various levels or data rates in the SONET hierarchy. Hierarchy goes like OC-1, OC3, OC-12, OC-24, OC-48, OC-96, OC-192 and OC-768 OC-1 is a SONET line with transmission speeds of 51.84 Mbit/s. OC-192 has a speed of 9953.28 Mbit/s (almost 10Gbps, so also called SONET 10G). You can get more details in SONET literature. - Neeraj Sharma
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