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Reference.org
Digital transmission hierarchy
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<p>Digital transmission hierarchy may refer to: </p> <ul><li><a href="/facts/Plesiochronous_digital_hierarchy/oTrEENKx">Plesiochronous Digital Hierarchy (PDH)</a></li> <li><a href="/facts/Synchronous_Digital_Hierarchy/G3LgtGS6">Synchronous Digital Hierarchy</a></li></ul>