Optical Fiber: SDH is typically transmitted over optical fiber, which offers high bandwidth, low latency, and reliable transmission over long distances.

Network Management: SDH also includes a network management layer that provides control and monitoring functions for the transmission network, allowing network operators to manage and monitor the performance of the network.

Interoperability: SDH is an international standard, providing interoperability between different network elements and allowing network operators to build scalable and flexible networks.

In summary, SDH is a reliable and efficient method of transmitting digital signals over optical fiber, used in telecommunications networks to transport large amounts of data over long distances. Its hierarchical structure, network management capabilities, and interoperability make it a widely used technology in the telecommunications industry.

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