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Which of the following is a 2.5G CDMA standard?

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Which of the following is a 2.5G CDMA standard?

(a) IS-95

(b) Cdma2000

(c) IS-95B

(d) CdmaOne

This question was addressed to me in an interview for internship.

My question comes from 2.5G in portion Modern Wireless Communication Systems of Wireless/Mobile

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The correct answer is (c) IS-95B

The explanation: IS-95B (Interim Standard 95B) is code division multiple access standard for 2.5G. It is an upgradation of IS- 95 which is a second generation standard of CDMA.

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