Optical Transport Networks from TDM to Packet

image of Optical Transport Networks from TDM to Packet

This Handbook discusses the technologies covered by ITU-T Recommendations related to Synchronous Digital Hierarchy (SDH), Optical Transport Network (OTN) and Ethernet over Transport (EoT). Each chapter of this Handbook is dedicated to a specific aspect (architecture, multiplexing hierarchy, protection, synchronization, etc.) of SDH, OTN and EoT optical transport networks. Plesiochronous Digital Hierarchy networks, which are at present considered obsolete, and Multiprotocol Label Switching - Transport Profile, which is at a preliminary stage of standardization, are only mentioned in the Preface. Finally, the last chapter of the Handbook discusses automatically switched optical networks (ASON), based on the control planes introduced in addition to transport planes and management planes.



Foreword and Acknowledgements

Telecommunication networks are continuously evolving towards providing seamless connectivity, in response to the apparently insatiable demands of people around the world to communicate in many different ways. Evolutionary technologies – especially optical technologies – are providing an excellent foundation upon which present-day and future networks can become robust, scalable and increasingly "intelligent". These advances have been enabled by the continuous hard work within technical standardization organizations, and ITU's Telecommunication Standardization Sector (ITU-T) is at the forefront of such efforts.


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