User manual

USER MANUAL OF WEBEE WIRELESS N ROUTER Version:1.1
Firmware Type 2
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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.
6.34. 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.