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What is Synchronous Digital Hierarchy (SDH)

Chapter 5
Handbook of Research on Global Diffusion of Broadband Data Transmission
Synchronic transmission and multiplex system for telecommunication networks. It operates at speeds of between 155 Mbits/s and (so far) 2.54 Gbits/s. SDH will be the future transmission system in the telecommunications network and will gradually replace PDH (retrieved February 15, 2007, from http://www.telenor.no/annual_report/rapporter/drift/ordliste.html).
Published in Chapter:
ICT Competency of Bangladesh to Face Broadband Diffusion
Anwarul Islam (Prime Minister’s Office, Bangladesh) and K. C. Panda (Sambalpur University, India)
Copyright: © 2008 |Pages: 18
DOI: 10.4018/978-1-59904-851-2.ch005
Abstract
The bull’s eye of Bangladesh has to achieve the millennium development goal and to adapt the globalization, necessitate pursuing the development. Information is playing a driven force in development. As a developing country, Bangladesh has taken keen initiatives to develop its sustainable information infrastructure. Teledensity and overall IT infrastructure is now in a growing stage. Recently, Bangladesh was connected with SEA-ME-WE-4 submarine cable, establishing an optical fiber backbone; its teledensity is changing in rapid pace. But the broadband diffusion in Bangladesh is not on par with other Asian countries, as it is in an embryonic stage in broadband diffusion. This chapter, therefore, tries to show the initiatives taken and the existing condition of Bangladesh to fetch the countrywide broadband diffusion. Efforts have been made in this chapter to unmask the overall development of ICT infrastructure in Bangladesh, so to judge the environment of broadband diffusion in the country.
Full Text Chapter Download: US $37.50 Add to Cart
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Chapter 55
Innovation and Utility in the Optical Transport Network
A standard published by the CCITT (now ITU-T) in 1989 as recommendations G.707 (SDH Bit Rates), G.708 (Network Node Interface for the SDH), and G.709 (Synchronous Multiplexing Structure). SDH was developed to overcome the inability of asynchronous circuits to extract lower order circuits from high capacity systems without having to completely demultiplex the high-speed signal. Additional requirements were drawn up for standard optical interfaces (e.g., OC12 and STM4) and standard operating and maintenance functions.
Published in Chapter: Innovation and Utility in the Optical Transport Network; From: Handbook of Research on Computer Mediated Communication
Full Text Chapter Download: US $37.50 Add to Cart
Chapter 55
Innovation and Utility in the Optical Transport Network
A standard published by the CCITT (now ITU-T) in 1989 as recommendations G.707 (SDH Bit Rates), G.708 (Network Node Interface for the SDH), and G.709 (Synchronous Multiplexing Structure). SDH was developed to overcome the inability of asynchronous circuits to extract lower order circuits from high capacity systems without having to completely demultiplex the high-speed signal. Additional requirements were drawn up for standard optical interfaces (e.g., OC12 and STM4) and standard operating and maintenance functions.
Published in Chapter: Innovation and Utility in the Optical Transport Network; From: Handbook of Research on Computer Mediated Communication
Full Text Chapter Download: US $37.50 Add to Cart
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