| 单词 | plesiochronous digital hierarchy |
| 释义 | > as lemmasplesiochronous digital hierarchy plesiochronous digital hierarchy n. a technology for voice communication which uses plesiochronous synchronization; abbreviated PDH. ΚΠ 1990 Tutorial: Impact of SONET/SDH on Optical Networks 1 in Fifth Vacation School on Optical Fibre Communications (IEE) The problems of the existing Plesiochronous Digital Hierarchy (PDH) and the role that a new generation of SDH equipment building blocks will play in solving them are reviewed. 2003 Electronic Engin. Times (Nexis) 2 June 24 The second is an aggregation and grooming solution for mapping plesiochronous digital hierarchy traffic over Sonet links. < as lemmas |
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