A QoS-Based Optical Networking
This chapter is dedicated to an overview of the existing network and node architectures for wavelength routing necessary to understand the novel, QoS-based approaches that will be taken. Obviously, a broad area of different issues for control, network architecture, resource allocation, and policies can be associated with QoS-based routing. However, rather than addressing single architectural aspects, we will try to justify the necessity for QoS-based consideration of network performance, which is expected to enter the networking market in the short term as a natural progressive step for wavelength-routed networks. Therefore, before going into the basics of optical node and optical network architectures (a subject so far treated by a number of excellent books, scientific papers and experimental trials), a few important introductory words will be dedicated to the notion of QoS, a feature that is still missing in the existing works on wavelength routing.
KeywordsOptical Network Wavelength Division Multiplex Asynchronous Transfer Mode Wavelength Converter Wavelength Division Multiplex Network
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- 1.There is commonly a distinction made in vocabulary that differentiates between cross-connection, switching, and routing [Thy96]. The first is used when the connection pattern is semi-permanent and the set-up is done by the network operator. Switching is based on connection set up by user signalling, and routing is connectionless switching of datagrams (a datagram is a packet routed independently of other packets from the same source). For example, SDH uses cross-connects, ATM uses both switches and cross-connects, and the Internet Protocol (IP) uses routers.Google Scholar
- 2.Office stands here for SDH equipment for aggregation of the traffic demand to the optical nodes.Google Scholar
- 3.Special office is supported by restoration and protection functions.Google Scholar