Chapter 19

Circuit-Switching: Hierarchical and Dynamic Call Routing

A good hockey player plays where the puck is. A great hockey player plays where the puck is going to be.

Wayne Gretzky

Abstract

Circuit-switched routing is of great historical significance in communication networks as well as for its application in modern communication networks such as optical networks. In this chapter, we first explain circuit-switching and then a number of call routing schemes for circuit-switching. In particular, we explain hierarchical routing and dynamic call routing that have been used in the global switched voice telephone networks. The main focus is to explain the basic principles of hierarchical and dynamic routing since they can be potentially ...

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