cnp3-ebook

principles/sharing

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Compared to CSMA, CSMA/CA defines more precisely when a device is allowed to send a frame. First, CSMA/CA defines two delays : `DIFS` and `EIFS`. To send a frame, a device must first wait until the channel has been idle for at least the `Distributed Coordination Function Inter Frame Space` (DIFS) if the previous frame was received correctly. However, if the previously received frame was corrupted, this indicates that there are collisions and the device must sense the channel idle for at least the `Extended Inter Frame Space` (EIFS), with :math:`SIFS<DIFS<EIFS`. The exact values for SIFS, DIFS and EIFS depend on the underlying physical layer [IEEE802.11]_.

6 years ago

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