フリー問題

問題文

A protocol analyzer is set to capture the 2.4 GHz PHY defined by IEEE 802.15.4. Which pair states how that PHY treats each transmitted symbol and how many carriers the channel plan of that band contains?

選択肢

1. The 2.4 GHz PHY fixes both numbers, so each transmitted symbol spreads the symbol chirp and the channel plan holds the sixteen channels in that specification.
2. The 2.4 GHz PHY fixes both numbers, so each transmitted symbol spreads the symbol chirp and the channel plan holds the eleven channels in that specification.
3. The 2.4 GHz PHY fixes both numbers, so each transmitted symbol spreads the symbol codeword and the channel plan holds the eleven channels in that specification.
4. The 2.4 GHz PHY fixes both numbers, so each transmitted symbol spreads the symbol codeword and the channel plan holds the sixteen channels in that specification.