Aopen aoi-821 User Manual

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¾  Preamble Type: 
The usage of the preamble is to limit the packet size of the data to transmit. It is 
recommended to choose the short preamble when the link quality is bad, it is to 
prevent the wasting time of resending a long packet that is lost. The Default is Auto 
which access short and long preamble. 
¾  Country Domain: 
This is the channel selection of each country regulatory domain, select the country 
where you are using this wireless device, users are responsible for ensuring that the 
channel set configuration is in compliance with the regulatory standards of these 
countries. 
¾  Fragment Threshold: 
Fragmentation Threshold is a way of transmitting the packets that will be 
fragmented. Choose a setting within a range of 256 to 2432 bytes. It is 
recommended to fragment the packet when the link quality is bad, it is to prevent 
the wasting time of resending a long packet that is lost. 
¾  RTS/CTS Threshold: 
The RTS/CTS Threshold is a station initiates the process by sending a RTS frame, 
the other ends receives the RTS and responds with a CTS frame, the station must 
receive a CTS frame before sending the data frame. This is to prevent the collisions 
by each station. Choose a setting within a range of 256 to 2432 bytes. It is 
recommended limiting a long packet to prevent each station waiting too long to 
transmit a data.