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PDH and SDH Optical Optical What is the difference?



In digital transmission system, there are two kinds of digital transmission line, called "quasi-synchronous digital hierarchy" referred PDH;

     Another called "synchronous digital hierarchy" referred SDH. PDH (quasi-synchronous digital hierarchy) is a small-capacity Optical Optical, usually in pairs application, called point applications.

     Capacity is generally 4 * E1,8 * E1,16 * E1. SDH (Synchronous Digital Hierarchy) Optical larger capacity, generally 16E1 to 4032E1.

          SDH can replace PDH, SDH but not replace PDH.

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