# Extended interframe space

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{{Short description|IEEE 802.11 protocol}}
{{notability|date=August 2018}}
{{primary sources|date=August 2018}}
'''Extended Interframe space''' ('''EIFS''') is used in IEEE 802.11 based WLANs. If a previously received frame contains an error then a station has to defer EIFS duration instead of DIFS before transmitting a frame. This is because, although this station was not able to decode the frame, it could be that the intended receiver could decode the frame. It should have the opportunity to return an Acknowledgment frame; the EIFS ensures the transmission of the Ack can proceed without interference from those not able to decode the frame. 

This duration is calculated by the below method.

EIFS = Transmission time of Ack frame at lowest phy mandatory rate  + SIFS + DIFS<ref>{{cite web |url=http://standards.ieee.org/getieee802/download/802.11-2012.pdf |archive-url=https://web.archive.org/web/20121119001122/http://standards.ieee.org/getieee802/download/802.11-2012.pdf |url-status=dead |archive-date=2012-11-19 |title=IEEE802.11-2012 }}</ref>

== See also ==
* [DIFS](/source/DCF_Interframe_Space)
* [RIFS](/source/Reduced_Interframe_Space)
* [SIFS](/source/Short_Interframe_Space)

== References ==
{{reflist}}

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Adapted from the Wikipedia article [Extended interframe space](https://en.wikipedia.org/wiki/Extended_interframe_space) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Extended_interframe_space?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.