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Which are the hardware components in SONET architecture? Draw the schematic diagram showing functional layers. Bring out the functions of each hardware components?
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Three basic devices used in the SONET system are shown in Fig. Functions of the three devices are mentioned below:

Synchronous Transport Signal (STS) multiplexer/demultiplexer: It either multiplexes signal from multiple sources into a STS signal or demultiplexes an STS signal into different destination signals.

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