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SONET / SDH - Synchronous Optical Network / Synchronous Digital Hierarchy
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physical layer standard for fiber optic transmissions standardized by ANSI and recommended by CCITT
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SONET is the carrier format used in the USA in which OC3c corresponds to a 155 Mbps
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SDH is a European carrier system in which STM-1 corresponds to 155 Mbps
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ATM and SMDS operates on top of SONET
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interface rates: OC1, OC3, OC9, OC12, OC18, OC24, OC36, OC48
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OC-3c/STM-1 SONET/SDH
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OC-12c/STM-4c SONET/SDH
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fiber based or microwave based (OC3, 6 GHz)
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framing STS-3c/STM
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