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<communications> (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 2-Mbit/s channels to be bit interleaved. The receiver discards these bits once the signals have been demultiplexed. [Is this correct?]
PDH is being replaced by SONET and other SDH (Synchronous Digital Hierarchy) schemes. Service levels are described with terms like DS1, as in ISDN.
(2001-04-27)