Sdh meaning

(Synchronous Digital Hierarchy) The European counterpart to SONET. See SONET.
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In 1988, the CCITT, predecessor to the ITU-T, accepted the SONET standards, with modifications that were mostly at the lower multiplexing levels in order to accommodate the complexities of internetworking the disparate national and regional networks. The ITU-T Recommendations referenced are G.707, G.708, and G.709. See also SONET.
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