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Synchronous Digital Hierarchy (SDH) is a standard for transmitting digital signals over optical fiber. It is widely used in telecommunications networks for transporting large amounts of data over long distances.
Digital Signal: SDH is based on the transmission of digital signals, which are more reliable and efficient than analog signals.
Synchronous: The term "synchronous" in SDH refers to the fact that the signals are transmitted in a synchronous manner, with each signal having a fixed time slot in the transmission frame.
Multiplexing: SDH uses a technique called multiplexing to combine multiple digital signals into a single signal, allowing multiple channels of data to be transmitted over a single fiber.
Hierarchical Structure: SDH has a hierarchical structure, with the signals being transmitted at different levels or "hierarchies" depending on their required bandwidth and speed.
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.