ISDN and ATM讲稿 Chapter 1. Fundamentals of the Transport Network 1 Transport Network Basics 1. Switched Communications Networks ← Switching---the temporary allocation of network resources. ← The fundamental Switching functions are: • Reducing the number of lines needed to connect all the users accommodated in the network; (Figure1.1, Figure 1.2) • Establishing different connections to allow different Combinations of users at different times, thus enabling the network resources to be shared by many users. ← The cost of a telecommunication network depends not only on the number of connections in the network, but also on the length of those connections. A simple connection network model for two ge……
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