Wireless is a half-duplex medium. Unlike Ethernet, wireless devices must contend for air time to transmit their frames. To avoid collisions, there are a number of mechanisms used:
- Physical Carrier Sense
- Virtual Carrier Sense
- a Coordination Function
In this episode, I go over these mechanisms and describe their purpose.
Here is a screenshot of a wireless frame showing the Duration value within the header. This Duration value is used to set a device’s NAV timer.
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