7 Switching Systems: Architecture and Performances
7.1 Introduction
In Chapter 6, we have described optical transmission systems-the type of equipment used in the telecommunication network to move the information bearing signal from one place to the other.
Besides transmission, the other key functionality of a telecommunication network is switching, that is, the ability of sending the signal from its origin to the correct destination selecting a suitable route in the network.
Differently from transmission, that essentially coincides with a physical function, switching exists almost at every network layer, since each layer needs to create routes for its proper signals.
This implies that while the base technology for transmission is well established ...
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