The PSTN Infrastructure
Our views about what a network should be designed to support and what the infrastructure should be comprised of have changed quite a bit over the years, as applications and technology have changed. Before discussing what is needed in a network today, this chapter takes a look at how the PSTN infrastructure evolved and where it is today.
The traditional PSTN infrastructure was specifically designed to support only voice communications. At the time this infrastructure was being designed, we had no notion of data communications. Initially the traffic type the PSTN was designed to support was continuous real-time voice.
Another variable that's important to the design of the PSTN has to do with the length of calls. Most voice ...
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