User's Manual

Table Of Contents
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events.
5.33 What is Frame Aggregation?
Every 802.11 packet, no matter how small, has a fixed amount of overhead associated with it. Frame
Aggregation combines multiple smaller packets together to form one larger packet. The larger
packet can be sent without the overhead of the individual packets. This technique helps improve the
efficiency of the 802.11n radio allowing more end user data to be sent in a given time.
5.34 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 draft
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.