Network evolution and its performance
The objective of this chapter is to present a network background to the subject of telecommunications QoS. A historic view of network evolution shows that the net work evolves as a series of life cycles, each becoming progressively shorter. Current evolution is towards a multiservices IP/ATM network. However, the current expan sion of the Internet is stimulating the growth of e-commerce and this requires the future network architecture to embrace the whole of the information value chain. Application software will now include all of that required by the distributed process ing system needed for e-commerce transactions and QoS will be dependent on many more network performance parameters than hitherto. The chapter has presented a mainly telecommunications centric view of the future network architecture, but there are other views from the computing and information communities that must not be ignored.
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