Saturday, March 28, 2015

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 switch
q1974 Internet packet voice
q1977 4ESS digital switch
q1980s Signaling System #7 (out-of-band)

q1990s Advanced Intelligent Network (AIN)

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