X-Micro Tech. WL-1502 Manual Do Utilizador

 
 

stations to establish and maintain communications in an orderly fashion. 

 

Beacon Interval represents the amount of time between beacon transmissions. Before a 

station enters power save mode, the station needs the beacon interval to know when to 

wake up to receive the beacon (and learn whether there are buffered frames at the access 

point). 

 

4.13 What is Preamble Type?   

There are two preamble types defined in IEEE 802.11 specification. A long preamble 

basically gives the decoder more time to process the preamble. All 802.11 devices 

support a long preamble. The short preamble is designed to improve efficiency (for 

example, for VoIP systems). The difference between the two is in the Synchronization 

field. The long preamble is 128 bits, and the short is 56 bits.   

 

4.14 What is SSID Broadcast?   

Broadcast of SSID is done in access points by the beacon. This announces your access 

point (including various bits of information about it) to the wireless world around it. By 

disabling that feature, the SSID configured in the client must match the SSID of the 

access point. 

 

Some wireless devices don't work properly if SSID isn't broadcast (for example the 

D-link DWL-120 USB 802.11b adapter). Generally if your client hardware supports 

operation with SSID disabled, it's not a bad idea to run that way to enhance network 

security. However it's no replacement for WEP, MAC filtering or other protections.   

 

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