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Meaning of PLESIOCHRONOUS DIGITAL HIERARCHY

 
Computing Dictionary
 
 Definition: 

(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.

PDH is being replaced by sonet and other SDH (synchronous digital hierarchy) schemes. Service levels are described with terms like ds1, as in isdn.

 

 

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