Basic rate is 64 Kbps in North America(designated as DS0) and in Europe (designated as E0). 30 channel one used in EuropeĪnd 24 channel one used in North America/Japan. Hence it is called plesiochronous.īit Interleaving is used in PDH to combine digital signals. In PDH, digital multiplexer's inputs(bit streams) are of same bit rateĪnd are derived from different clocks from different oscillators.Įach will differ within tolerance of few clock periods. Many such bit streams/channels (either 24,30 or multiples) often called as tributaries. The different hierarchies having different bit rates are combined. PDH stands for Plesiochronous Digital Hierarchy and SDH stands for Synchronous Digital Hierarchy.īoth PDH and SDH are terminologies associated with digital multiplexers used in exchanges. It explains basics of PDH and SDH and mentions useful difference between terms. This page PDH vs SDH describes difference between PDH and SDH. PDH vs SDH | Difference between PDH and SDH
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