ZyXEL Communications Corporation P873HNUP51B Manuel D’Utilisation

 Chapter 7 Wireless

P-873HNUP-51B User’s Guide

• A maximum of eight BSSs are allowed on one AP simultaneously.

• You must use different keys for different BSSs. If two wireless devices have different BSSIDs 

(they are in different BSSs), but have the same keys, they may hear each other’s 
communications (but not communicate with each other).

• MBSSID should not replace but rather be used in conjunction with 802.1x security.

Preamble is used to signal that data is coming to the receiver. Short and long refer to the length of 
the synchronization field in a packet.

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

Use long preamble if you are unsure what preamble mode other wireless devices on the network 
support, and to provide more reliable communications in busy wireless networks. 

Use short preamble if you are sure all wireless devices on the network support it, and to provide 
more efficient communications.

Use the dynamic setting to automatically use short preamble when all wireless devices on the 
network support it, otherwise the ZyXEL Device uses long preamble.

Note: The wireless devices MUST use the same preamble mode in order to communicate.

Your ZyXEL Device supports WiFi Protected Setup (WPS), which is an easy way to set up a secure 
wireless network. WPS is an industry standard specification, defined by the WiFi Alliance.

WPS allows you to quickly set up a wireless network with strong security, without having to 
configure security settings manually. Each WPS connection works between two devices. Both 
devices must support WPS (check each device’s documentation to make sure). 

Depending on the devices you have, you can either press a button (on the device itself, or in its 
configuration utility) or enter a PIN (a unique Personal Identification Number that allows one device 
to authenticate the other) in each of the two devices. When WPS is activated on a device, it has two 
minutes to find another device that also has WPS activated. Then, the two devices connect and set 
up a secure network by themselves.

WPS Push Button Configuration (PBC) is initiated by pressing a button on each WPS-enabled 
device, and allowing them to connect automatically. You do not need to enter any information. 

Not every WPS-enabled device has a physical WPS button. Some may have a WPS PBC button in 
their configuration utilities instead of or in addition to the physical button.

Take the following steps to set up WPS using the button.