CDMA

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Stands for “Code Division Multiple Access”, CDMA can also be referred to as cdmaOne or IS-95A. CDMA is just a digital cell phone technology that assigns a special signal allowing numerous calls to become created within the same consistency is channeled by each.
 

CDMA is also uses in (UHF) ultra high frequency with the speed of 800 and 1.9 from mega hertz to gega hertz.It converts analog to digital with the amalgamation of spread spectrum technology. As first audio input converted into digital (binary elments) and further procedure takes place.
 

The main developers of the Altai system were VNIIS (Voronezh Science Research Institute of Communications) and GSPI (State Specialized Project Institute). In 1963 this service started in Moscow and in 1970 Altai service was used in 30 USSR cities.

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Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone.