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Which of the following is not backward compatible with Cdma2000?

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Which of the following is not backward compatible with Cdma2000?

(a) Cdma2000 1xRTT

(b) Cdma2000 3xRTT

(c) Cdma2000 1xEV-DO

(d) Cdma2000 1xEV-DT

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This interesting question is from 3G Cdma2000 topic in chapter Modern Wireless Communication Systems of Wireless/Mobile

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Best answer
The correct option is (c) Cdma2000 1xEV-DO

The best explanation: Cdma2000 1xEV-DO option provides data rates of about 2.4 Mbps and supports data traffic only. No voice communication is supported. It relaxes the minimum latency requirement. But this mode is not backward compatible with Cdma2000.

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