What's exactly in a PSTN. What is is made up of? What are some of the equipment used in a PSTN? I have seen those exchange buildings, those dull (and sometimes unamed) concrete buildings with very few windows, if any. Yet, they are able to connect to netwoks all over the world. Just pick up any land line and dial the country code, followed by the area code, then number (of course do watch your next telephone bill). All this was before the advent of the Internet and VoIP.
Could anyone tell me which companies produce industrial grade PSTN equipment (preferbaly 1980s and early 1990s)? I hope some Telecom experts can answer this question.
Suren,
What I meant was an explanation of how it works. Anyway, cooladi gave a very comprehensive answer. Thanks. Keep those answers flowing!
Oh, and where can I obtain a copy of the ITU technical standards? Is it free?
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Short for Public Switched Telephone Network, (PSTN) which refers to the international telephone system based on copper wires carrying analog voice data. This is in contrast to newer telephone networks base on digital technologies, such as ISDN and FDDI.
Telephone service carried by the PSTN is often called plain old telephone service (POTS