ZyXEL Communications Corporation VSG1435B101 Manuel D’Utilisation

 Chapter 7 Wireless

VSG1435-B101 Series User’s Guide

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.

The ZyXEL 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.

Figure 39   WDS Link Example