ZyXEL Communications zyair g-302 User Manual

ZyXEL G-302 v3 User’s Guide

Chapter 2 Wireless LAN Network

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Figure 11   WPA(2) with RADIUS Application Example

The IEEE 802.11b/g standard describes a simple authentication method between the wireless 
stations and AP. Two authentication types are defined: an Open system mode and a Shared 
key mode.

•  Open system mode is implemented for ease-of-use and when security is not an issue. 

The wireless station and the AP or peer computer do not share a secret key. Thus the 
wireless stations can associate with any AP or peer computer and listen to any transmitted 
data that is not unencrypted.

•  Shared key mode involves a shared secret key to authenticate the wireless station to the 

AP or peer computer. This requires you to enable the wireless LAN security and use same 
settings on both the wireless station and the AP or peer computer. 

Preamble is used to signal that data is coming to the receiver.  

Short preamble increases performance as less time sending preamble means more time for 
sending data. All IEEE 802.11b/g compliant wireless adapters support long preamble, but not 
all support short preamble. 

Select Auto to have the G-302 v3 automatically use short preamble when access point/
wireless stations support it, otherwise the G-302 v3 uses long preamble. 

Note: The G-302 v3 and the access point/wireless stations MUST use the same 

preamble mode in order to communicate.