ZyXEL Communications Corporation VMG1312B10A Manuel D’Utilisation

 Chapter 7 Wireless

VMG1312-B10A User’s Guide

• 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 Device uses long preamble.

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

The Device can act as a wireless network bridge and establish WDS (Wireless Distribution System) 
links with other APs. You need to know the MAC addresses of the APs you want to link to. Once the 
security settings of peer sides match one another, the connection between devices is made.

At the time of writing, WDS security is compatible with other ZyXEL access points only. Refer to 
your other access point’s documentation for details.

The following figure illustrates how WDS link works between APs. Notebook computer A is a 
wireless client connecting to access point AP 1. AP 1 has no wired Internet connection, but it can 
establish a WDS link with access point AP 2, which has a wired Internet connection. When AP 1 
has a WDS link with AP 2, the notebook computer can access the Internet through AP 2.

WDS Link Example

Your 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.