Data Bases • Custom Term Papers • Free Term Papers • Free Research Papers • Free Essays • Free Book Reports • Plagiarism? Links • Top 100 Term Paper Sites • Top 25 Essay Sites • Top 50 Essay Sites • Search 97,000 Papers @ DirectEssays.com • Search 101,000 Papers @ ExampleEssays.com • Search 90,000 Papers @ MegaEssays.com Free Essays • Term Paper Sites • Chuck III's Free Essays • Free College Essays • TermPaperSites.com • My Term Papers • Get Free Essays • Essay World • Planet Papers	Search Lots of Essays Back to Subjects - Technology PSTN PSTN The US Public Switched Telephone Network (PSTN), is very possibly the largest distributed system in existence. Most telephone switching networks does the same basic thing as the PSTN by going by a simple procedure: It basically connects point A to point B. Even though this seems like a very simple thing to do it is not always the easiest. The US PSTN requires some of the most complex computing systems in existence. Software for each switch might have several million lines of code, even if it has not many features. PSTN is the world’s collection of the Interconnected voice-oriented public telephone networks. PSTN is both commercial and publicly owned. It is also said to be the plain old telephone service. It is the same thing as the telephone networks that came from the days of Alexander Graham Bell who started the whole telephone thing off. Now it is almost all digital in technology except the central telephone office which to the user The PSDN has thousands of switches. Switches have lots of redundant hardware and a lot of self-checking and recovery software. For many decades, AT&T has expected its switches too not to go down for more than two hours in forty years. That is a failure rate of 5.7 x 10^-6. In relation to the Internet, the PSTN actually helps a lot of the Internets long distance infrastructure. Because Internet service providers (ISP’s) pay the long distance providers for access to their infrastructure and share the circuits among all the users, Internet users avoid having to pay usage charge to anyone other than their ISP’s. The PSTN is part of the fixed telecommunications network of KPN telecom for narrowband switched services. A general description of this type of network is provided. For most of the history of telephone networks, direct conversation between two people and the voice telephone service was the only basic thing that the PSTN did. The 300-3400 Hz bandwidth makes it designed for that purpose. Still today voice transmitting is still the most common use of the PSTN but it is also used for several different things, which are called non-voice services . Some of these devices are fax machines, modems that connect to the Internet and a few other data transfer devices. Everyday there are more and more people starting to use the PSTN for other purposes other than the telephone. Now there is DSL, which just came out in 1998, and it is just getting on its feet and getting popular. I think that one day everyone will have DSL for there Internet and the PSTN will have just voice telephone service. There will not be any more data sending through the PSTN because DSL will do all of that part. Bibliography: Word Count: 458
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