The
IEEE 802.11 family of standards describe the
DCF protocol, which controls access to the physical medium. A station must sense the status of the wireless medium before transmitting. If it finds that the medium is continuously idle for DCF Interframe Space (DIFS) duration, it is then permitted to transmit a frame. If the channel is found busy during the DIFS interval, the station should defer its transmission.
DIFS duration can be calculated by the following method.
DIFS =
SIFS + (2 * Slot time)
[, 2016, Equation (10-6), page 1332.]
IEEE 802.11g
IEEE 802.11g-2003 or 802.11g is an amendment to the IEEE 802.11 specification that operates in the 2.4 GHz microwave band. The standard has extended throughput to up to 54 Mbit/s using the same 20 MHz bandwidth as 802.11b uses to achieve 11 Mbit/ ...
is backward compatible with
IEEE 802.11b
IEEE 802.11b-1999 or 802.11b is an amendment to the IEEE 802.11 wireless networking specification that extends throughput up to 11 Mbit/s using the same 2.4 GHz band. A related amendment was incorporated into the IEEE 802.11-2007 standard.
...
. When these devices are associated with same AP all the timing parameters are changed to 802.11b.
See also
*
SIFS
*
PIFS
*
AIFS
*
RIFS
*
EIFS
*
DCF
References
{{reflist
D
Media access control