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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 point 970s as shown...

 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 970µs as shown in the following figure.

The channel is busy at this time due to some other wireless sources' transmission. Hence, station A chooses a random backoff time of 30 time slots. The transmission from other sources ends at time point 1000µs.  The transmission from other sources later resumes at time point 1130µs and lasts until time point 1230µs. After the time point 1230µs, there is no transmission from other sources. The durations of various interframe spacings in IEEE 802.11b are shown in the following table

Name

Duration(µs)

DIFS

50

SIFS

10

PIFS

30

Time Slot 

20

When (in µs) will station A be able to transmit its packet?

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