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The PSTN – Digitization Voice frequency is 100 - 5000 Hz, with the main portion from 300 – 3400 Hz Nyquist Theorem states that sampling must be done at twice the highest frequency to recreate. 4000 Hz was chosen as the maximum frequency, thus sa… Read More
PSTN Evolution q1876 invention of telephone q1915 first transcontinental telephone (NY–SF) q1920’s first automatic switches q1956 TAT-1 transatlantic cable (35 lines) q1962 digital transmission (T1) q1965 1ESS analog … Read More
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The PSTN – Architecture, Switches •PSTN – Public Switched Telephone Network •As the name says, it’s switched… •Each conversation requires a channel switched throughout the network •Circuit setup uses a separate out-of-band intelligent network (SS… Read More
Bus Network nLinked by a twisted wire, coaxial cable, or fiber optic nno host computer control nsubject to traffic problems nMost common Ethernet nOriginally proposed in 1972 by Xerox nLater DEC and Intel joined in nBecame th… Read More
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