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SDH definitions

7/14/15  |  Technical Article

SDH (Synchronous Digital Hierarchy), defined according to ITU-T recommendations, is the transmission of digital signals at different speeds to provide information on the structure of the corresponding level, including the multiplexing method and mapping method, as well as the associated synchronization method consisting of a technical system.

Optical larger capacity, generally 16E1 to 4032E1. SDH is a kind of multiplexing, line transmission and switching functions integrated, comprehensive messaging network by unified network management system operation, Bell Communications Research Institute in the United States put forward a Synchronous Optical Network (SONET). International Telegraph and Telephone Consultative Committee (CCITT) (now ITU-T) to accept the concept SONET in 1988 and renamed SDH, making it not only applies to optical fiber technology is also applicable to the common system of microwave and satellite transmission. It enables effective network management, real-time traffic monitoring, dynamic network maintenance, and many other features interoperability between devices from different manufacturers, can greatly improve network resource utilization, reduce management and maintenance costs, flexible, reliable and efficient network operation and maintenance . So it is the world's hot spots in the field of information transmission technology development and applications.


 SDH, SONET, network

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