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Unformatted text preview: Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 1/58 Synchronous Optical Network (SONET) Definition Synchronous optical network (SONET) is a standard for optical telecommunications transport formulated by the Exchange Carriers Standards Association (ECSA) for the American National Standards Institute (ANSI), which sets industry standards in the U.S. for telecommunications and other industries. The comprehensive SONET standard is expected to provide the transport infrastructure for worldwide telecommunications for at least the next two or three decades. Overview This tutorial provides an introduction to the SONET standard. Standards in the telecommunications field are always evolving. Information in this SONET primer is based on the latest information available from the Bellcore and International Telecommunications Union–Telecommunications Standardization Sector (ITU– T) standards organizations. Use this primer as an introduction to the technology of SONET. If more detailed information is required, consult the latest material from Bellcore and ITU–T, paying particular attention to the latest date. For help in understanding the language of SONET telecommunications, a comprehensive Glossary is provided. Topics 1. Introduction to SONET 2. Why Synchronize? 3. Frame Format Structure 4. Overheads 5. Pointers 6. SONET Multiplexing 7. SONET Network Elements Web ProForum Tutorials http://www.iec.org Copyright © The International Engineering Consortium 2/58 8. SONET Network Configurations 9. What Are the Benefits of SONET? 10. SDH Reference 11. SONET Reference Materials Self-Test Correct Answers Glossary 1. Introduction to SONET Synchronous optical network (SONET) is a standard for optical telecommunications transport. It was formulated by the ECSA for ANSI, which sets industry standards in the United States for telecommunications and other industries. The comprehensive SONET/synchronous digital hierarchy (SDH) standard is expected to provide the transport infrastructure for worldwide telecommunications for at least the next two or three decades. The increased configuration flexibility and bandwidth availability of SONET provides significant advantages over the older telecommunications system. These advantages include the following: • reduction in equipment requirements and an increase in network reliability • provision of overhead and payload bytes—the overhead bytes permit management of the payload bytes on an individual basis and facilitate centralized fault sectionalization • definition of a synchronous multiplexing format for carrying lower level digital signals (such as DS–1, DS–3) and a synchronous structure that greatly simplifies the interface to digital switches, digital cross- connect switches, and add-drop multiplexers • availability of a set of generic standards that enable products from different vendors to be connected • definition of a flexible architecture capable of accommodating future...
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- Spring '11