ZyXEL N4100 Guia Do Utilizador

 Chapter 25 Wireless LAN

N4100 User’s Guide

Authentication 
mode

There are two types of WEP authentication namely, Open System and 
Shared Key. 

Open system is implemented for ease-of-use and when security is 
not an issue. The wireless client and the AP or peer computer do not 
share a secret key. Thus the wireless clients can associate with any AP 
or peer computer and listen to any transmitted data that is not 
encrypted.

Shared key mode involves a shared secret key to authenticate the 
wireless client to the AP or peer computer. This requires you to enable 
the wireless LAN security and use same settings on both the wireless 
client and the AP or peer computer.

Select Shared Key to have the N4100 authenticate only those 
wireless clients that use Shared Key mode and have the correct WEP 
key. 

Select Open System to have the N4100 allow association with 
wireless clients that use Open System mode. Data transfer is 
encrypted as long as the wireless client has the correct WEP key for 
encryption. 

Select Both to have the N4100 allow association with wireless clients 
that use Open System mode. Data transfer is encrypted as long as 
the wireless client has the correct WEP key for encryption. The N4100 
authenticates wireless clients using Shared Key mode that have the 
correct WEP key.

Beacon Interval

Set the number of milliseconds that should pass between sending out 
a beacon. Enter a time period between 20 and 999. The default is 
100. 

RTS Threshold

Enter a value between 1 and 2347 to enable an RTS/CTS handshake to 
avoid retransmitting due to hidden nodes.

Fragmentation 
Threshold

Enter a value between 256 and 2346 to enable a fragmentation 
threshold. This sets the maximum size of data fragments that can be 
sent. Use a low setting if there is a great deal of radio interference.

Preamble Type

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 compliant 
wireless devices support long preamble, but not all support short 
preamble. 

Select Long Preamble if you are unsure what preamble mode the 
wireless clients support, and to provide more reliable communications 
in busy wireless networks. Select Short Preamble if you are sure the 
wireless clients support it, and to provide more efficient 
communications. Select Dynamic Preamble to have the N4100 
automatically use short preamble when wireless clients support it, 
otherwise the N4100 uses long preamble.

Default

Click this button to load the factory default wireless LAN settings. 

Apply

Click this button to save your changes back to the N4100.

Table 48   ADVANCED > WIRELESS (continued)