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Plesiochronous Digital Hierarchy

   Also found in: Acronyms, Wikipedia 0.04 sec.
(communications)Plesiochronous Digital Hierarchy - (PDH) A transmission system for voice communication using plesiochronous synchronisation.

PDH is the conventional multiplexing technology for network transmission systems. The transmitter adds dummy information bits to allow multiple channels to be bit interleaved. The receiver discards these bits once the signals have been demultiplexed.

PDH combines multiple 2 Mb/s (E1) channels in Europe and 1.544 Mb/s (DS1) channels in the US and Japan.

PDH is being replaced by SONET and other SDH (Synchronous Digital Hierarchy) schemes.


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introduction to the Plesiochronous Digital Hierarchy (PDH)
Gain Valuable Knowledge on Transmission Principles with New ... by Business Wire
Nokia and Nera, both leading suppliers of wireless transmission equipment, have taken a step in closer technology co-operation by signing an agreement under which Nera will license Nokia's plesiochronous digital hierarchy (PDH) radio transmission technology.
Nokia and Nera Intensify Their Technology Cooperation in Wireless ... by Business Wire
Based on Plesiochronous Digital Hierarchy technology, these systems are designed for seamless integration into any urban environment.
Alcatel Signs 145-million Euro Global Agreement with Vodacom For ... by Business Wire
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