The many networks and how they link
This chapter introduces the concept of the many other telecommunications networks that exist today and how they all interlink. Firstly, we look briefly at the two other types of network, in addition to the PSTN, that carry telephone calls, namely: mobile networks and cable TV networks. It is noted that all three networks use essentially the same type of switching system, but that the mobile networks use radio links and mobility management in place of the fixed wire access of the PSTN and cable TV networks. The necessary interconnection of all these types of networks within a country and to networks in other countries is described. We also introduce the concept of the Internet and how subscribers gain access to it via the PSTN, cable modems over Cable TV networks, xDSL broadband, mobile networks or over leased-lines using optical fibre.
The many networks and how they link, Page 1 of 2
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