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The dual mode USDC/AMPS system was standardized as ____________

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The dual mode USDC/AMPS system was standardized as ____________

(a) IS-54

(b) IS-136

(c) PSTN

(d) GSM

The question was asked at a job interview.

The above asked question is from United States Digital Cellular (IS-54 and IS-136) topic in section Wireless Systems and Standards of Wireless/Mobile

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Right choice is (a) IS-54

To explain I would say: The dual mode USDC/AMPS system was standardized as Interim Standard 54 (IS 54). It was standardized by Electron Industries Association and Telecommunication Industry Association (EIA/TIA) in 1990. It was later upgraded to IS-136.

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