The AMPS was designed for voice transmission is a technology that is used to allow data over the same voice channels with a frequency of 800 MHz. The cellular data transfer needs a connection between every end just like a voice session. During this connection the cellular data transmission sends data over the airlink (through a PSTN (Public Switched Telephone Network)) to the remote computer.
For a well cellular phone have been utilize radio signals originally radio performance losses signals because of interference of noise and channel degradation which affect data transmission. Therefore ETC (Enhanced Throughtput Cellular) have been introduced to control data compression, error correction and modulation to provide faster reliable transmission along with MNP(Mircrocom Network Protocol)..
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