Introduction
The networking world is evolving at an ever-increasing pace. The rapid displacement of legacy, purpose-built networks based on time-division multiplexing (TDM), Frame Relay, and Asynchronous Transfer Mode (ATM) technologies to ubiquitous Internet Protocol (IP) packet-based networks capable of supporting converged network services is well under way. Service providers can no longer afford to deploy multiple networks, each built to support a single application or service such as voice, business-class data, or Internet traffic. The cost of deploying and operating multiple networks in this business model is not financially sustainable. In addition, customer demand for integrated services and applications, as well as new services and applications, ...
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