This paper is focused on a cost-effective solution to the scheduling problem, which is not based on typical search algorithms and whose complexity can be made almost independent of the dimension of the resource set to be searched. As a consequence, whatever scheduling policy is adopted, it must be implemented in an extremely effective way in terms of computational complexity. Because of the very large bandwidth on the wavelength channels, the burst/packet arrival rate at the network nodes is very high and therefore the time available to take the scheduling decision is very limited. space domains, turning this problem into a choice of the best available resource in the different domains. The scheduling may be performed in the wavelength, time and. In both cases, due to statistical multiplexing, a scheduling policy is needed to solve contentions at the node level caused by more than one burst/packet directed to the same output channel. Optical burst and packet switching are being considered as the most promising paradigms to increase bandwidth efficiency in IP over DWDM networks. Additionally, an operations support system is available for flexibly introducing services and reducing operation costs. This book contributes to a mid-term strategy oriented to reduce time to market and costs, improve production flexibility and minimize environmental impacts to increase worldwide competitiveness.
For service and operation support, Hitachi has proposed a novel active network technology for providing new services. Download File PDF Optical Communications Gayatri Vidya Parishad College Of advantages to be gained from using PKMs.
For access networks, Hitachi is developing a scalable, multi-layer switching access node architecture. Furthermore, a transparent transponder multiplexer system has been developed to facilitate adaptation of legacy low-speed traffic to high-speed networks. For backbone and metropolitan optical networks, Hitachi provides SONET/SDH and DWDM transmission systems. multi-functional IP node, the GR2000, and is developing a next-generation tera-bit-class IP node architecture. For backbone IP networks Hitachi provides a large-capacity. In this paper we describe Hitachi's carrier IP network systems and how they fulfill these requirements. They and their nodes must thus support higher speeds, larger capacities, and higher reliability. As more and more services become available on the Internet, carrier IP networks are becoming more of a social infrastructure.