The difference between touchtone and rotary dial for identification of the digits selected is that the rotary dial uses pulses of specific lengths, while touchtone uses frequencies.

Question

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Rotary dial phones identify digits by sending a series of electrical pulses corresponding to each digit, while touchtone phones use a dual-tone multi-frequency (DTMF) signaling system, where each digit is represented by a unique combination of two frequencies.

The Difference Between Touchtone and Rotary Dial for Identification of the Digits