Introduce
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How to introduce SDH into an optical fiber communication system
This tutorial provides an overview of SDH/SONET, covering basics, HDLC framing, terminologies, rates, and the SONET STS-1 SDH Frame. SONET (Synchronous Optical Network) and SDH (Synchronous Digital Hierarchy) serve the same purpose: communication over optical fiber links. It provides a flexible and efficient way to transport large amounts of data with high reliability and synchronization. While SONET is predominantly used in North America, SDH serves. Cisco brings together Al, automation, and security into one unified architecture—built to simplify operations, scale intelligently, and protect every connection.