CTS 041: 802.11 Medium Contention
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. Links and Resources * 802.11 Arbitration