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In the early days of the Internet, the most precious resource was long-haul transmission capacity. Thus, the packet switching architecture was designed to use this resource as efficiently as possible. With the ubiquitous deployment of WDM in core networks in the last few years, long-haul transmission is now cheaper than router switching at core nodes; this is because the rate of decrease in cost per unit of optical fiber capacity is well below that of Moore's Law, which governs the cost of electronic ICs from which electronic routers and switches are built. To keep reaping the economic benefits of optical networking technologies, long duration (quasi-static) optical circuit switching - GMPLS - will be used in the next cycle of build-up in the core.

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Format:PDFSize:555 KB
Date:Dec 2006
Pages:8

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