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Which of the following is the world’s first cellular system to specify digital modulation and network level architecture?

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Which of the following is the world’s first cellular system to specify digital modulation and network level architecture?

(a) GSM

(b) AMPS

(c) CDMA

(d) IS-54

This question was addressed to me in examination.

This intriguing question originated from Global System for Mobile (GSM) in portion Wireless Systems and Standards of Wireless/Mobile

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Best answer
Correct choice is (a) GSM

The best I can explain: GSM was the world’s first cellular system to specify digital modulation and level architectures and services. It is the world’s most popular 2G technology. It was developed to solve the fragmentation problems of the first cellular systems in Europe.

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