Popularize the difference between SDH and PDH

Release time:

2025-05-16

Simply put, SDH is an upgraded version of PDH. PDH (Plesiochronous Digital Hierarchy) was the main transmission system used in the early internet. However, with the rapid development of the internet industry, the amount of information transmitted, exchanged, and processed through the network has been increasing exponentially. By 2018, the PDH transmission system could no longer meet existing applications, thus leading to the emergence of the SDH transmission system.

Popularize the difference between SDH and PDH

Some customers are unclear about the difference between SDH and PDH, and easily confuse the two. Let's explain the difference between SDH and PDH to help everyone choose the right transmission system for their work.

Simply put, SDH is PDH an upgraded version. PDH (Plesiochronous Digital Hierarchy) was the main transmission system used in the early internet. However, with the rapid development of the internet industry, the amount of information transmitted, exchanged, and processed through the network has been increasing exponentially. By 2018, the PDH transmission system could no longer meet existing applications, so the SDH transmission system was developed.

PDH optical transmission equipment In digital communication systems, the transmitted signals are all digital pulse sequences. When these digital signal streams are transmitted between digital switching devices, their rates must be perfectly consistent to ensure accurate information transmission. This is called "synchronization".

In digital transmission systems, there are two digital transmission series: one is called "Plesiochronous Digital Hierarchy", abbreviated as PDH; the other is called "Synchronous Digital Hierarchy", abbreviated as SDH.

The difference lies in the degree of synchronization. Generally speaking, SDH synchronization is complete and accurate, while PDH synchronization is incomplete and inaccurate.

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