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What is the T250 model of Mitsubishi?

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What is the T250 model of Mitsubishi?

(a) Single-mode handset

(b) Dual-mode handset

(c) Three-mode handset

(d) Four-mode handset

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This intriguing question comes from Building CRA on SDR Architecture in chapter Cognitive Radio Architecture of Cognitive Radio

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The correct option is (c) Three-mode handset

The explanation: The T250 model of Mitsubishi is a three-mode handset. It operates in Time Division Multiple Access (TDMA) mode on 850 or 1900 MHz, Advanced Mobile Phone System (AMPS) mode on 850 MHz, and in Cellular Digital Packet Data (CDPD) mode on 1900 MHz. It is a primitive example of multiband, multimode wireless device.

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