A.34 what is guard intervals (gi) – PLANET WNAP-7350 User Manual
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User Manual of WNAP-7350
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A.34 What is Guard Intervals (GI)?
A GI is a period of time between symbol transmission that allows reflections (from multipath) from the previous
data transmission to settle before transmitting a new symbol. The 802.11n specifies two guard intervals: 400ns
(short) and 800ns (long). Support of the 400ns GI is optional for transmit and receive. The purpose of a guard
interval is to introduce immunity to propagation delays, echoes, and reflections to which digital data is normally
very sensitive.
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