Synchronous Optical Networking (SONET) and Synchronous Digital Hierarchy (SDH)
OC - Optical Carrier
SONET offers an additional basic unit of transmission, the STS-1 (Synchronous Transport Signal 1) or OC-1, operating at 51.84 Mbit/s—exactly one third of an STM-1/STS-3c/OC-3c carrier.
So (3) STS-1 circuits = 155 Meg.
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