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In a wifi network based on 802.11b, assume that station A wants to transmit a packet and starts to sense the wifi channel at time

In a wifi network based on 802.11b, assume that station A wants to transmit a packet and starts to sense the wifi channel at time point 970sasshown in the following figure.

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Transmission from other Transmission from Transmission from sources other sources Station A Time 1000us 1130us 1230us ?? Station A starts to sense the channel at 970us

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