SDH/SONET

SDH/SONET

SDH/SONET technology differs by region. SONET is sold only in North America. SDH is sold outside North America and comes in two types: SDH (Japan) is sold only in Japan, while SDH (ETSI) is sold in the rest of the world. SDH/SONET supports ring and mesh topologies, and protection of circuits through automatic protection switching (APS) is standard, via various protection programs.

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