It can transfer multiple digital bitstreams synchronously over the optical fiber system using lasers or highly coherent light from LED called as light-emitting diodes. It is an international standard that is highly popular and used for its high speed data transfer of the telecommunication and digital signals. SDH(Synchronous Digital Hierarchy) was originally used for transmitting multiple phone calls (encoded in PCM) over a single strand of fibre. But with the change in technology, the PDH is now being replaced by the SDH or what is popularly called as synchronous digital hierarchy. PDH(plesiochronous digital hierarchy) is a popular technology that is widely used in the networks of telecommunication in order to transport the huge amounts of data over the digital equipment for transportation like microwave radio or fiber optic systems.
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