Part 3
Network Technologies
This part deals with the primary core network technologies that operate over the physical media. It explains both the transmission network and data overlay network technologies. The transmission network is closely related to the particular media and is used as a common network able to carry a wide variety of signal types. Above the transmission network are a number of overlay networks that are designed to provide a particular range of services to network users. A number of different overlays have been developed; for example, PSTN is an overlay network delivering voice services, while Frame Relay is an overlay network offering low speed data services. These networks are called overlays because they overlay the transmission ...
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