单词	pstn
释义	PSTN PSTN abbreviation for (Telecommunications) public switched telephone network: the conventional message switched telephone network PSTN PSTN (communications) public switched telephone network PSTN Public Switched Telephone Network PSTN (Public Switched Telephone Network) The worldwide voice telephone network. Also called the "plain old telephone system" (POTS) and originally analog only, the heart of most telephone networks today is digital. However, the lines from the home and office to the digital loop carrier (DLC) junction box in the neighborhood typically remain analog. At that point, analog signals are converted to digital. IP Backbones Increasingly, the digital infrastructure of the PSTN is migrating from the TDM-based circuit-switched architecture to IP-based packet switching (see IP telephony). See digital loop carrier and AIN. Switched, But Not Too Public In 1886, this 50-line magneto switchboard, made by Bell Telephone of Canada, was used to switch voice calls in small localities. These instruments were the beginning of the worldwide PSTN. (Image courtesy of Nortel Networks.) MedicalSeeAIN PSTN Acronym Definition PSTN➣Public Switched Telephone Network PSTN➣Position PSTN➣Public Switched Telecommunications Network PSTN➣Public Service Telephone Network (less common) PSTN➣Pesticide Safety Team Network PSTN➣Postal Satellite Training Network ThesaurusSeeain
随便看	sem-e seme semea semeca sem-eda sem/edax seme (disambiguation) seme(disambiguation sem-eds sem/edx sem-edxa semeg semei semei- semeikino semeiko, nikolai semeiko, nikolai illarionovich semeiography semeiologic semeiological semeiologist semeiology semeion semeiopathic semeiosis

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