What is SDH?
SDH or Synchronous Digital Hierarchy is a standardized protocol used for transmitting digital signals over optical fiber networks. It is used to transport large amounts of data over long distances, typically in telecommunications and data networking applications. SDH uses a hierarchical structure of multiplexing that allows multiple data streams of different speeds to be combined into a single high-speed stream. While SDH/SONET has been a key technology in the development of modern optical fiber networks, it has largely been superseded by newer technologies such as IP/MPLS (Internet Protocol Multi-Protocol Label Switching). To learn more about Ribbon's IP/MPLS solutions: