Preamble Type; Configuring Wep Encryption - ZyXEL Communications ZyAIR G-500 User Manual

Shared key authentication involves a four-message procedure. A wireless station sends a shared key
authentication request to the AP, which will then reply with a challenge text message. The wireless station
must then use the AP's default WEP key to encrypt the challenge text and return it to the AP, which attempts
to decrypt the message using the AP's default WEP key. If the decrypted message matches the challenge text,
the wireless station is authenticated.
When your ZyAIR's authentication method is set to open system, it will only accept open system
authentication requests. The same is true for shared key authentication. However, when it is set to auto
authentication, the ZyAIR will accept either type of authentication request and the ZyAIR will fall back to
use open authentication if the shared key does not match.
6.3

Preamble Type

A preamble is used to synchronize the transmission timing in your wireless network. There are two preamble
modes: Long and Short.
Short preamble takes less time to process and minimizes overhead, so it should be used in a good wireless
network environment when all wireless clients support it.
Select Long if you have a 'noisy' network or are unsure of what preamble mode your wireless clients support
as all IEEE 802.11b compliant wireless adapters must support long preamble. However, not all wireless
adapters support short preamble. Use long preamble if you are unsure what preamble mode the wireless
adapters support, to ensure interpretability between the ZyAIR and the wireless stations and to provide more
reliable communication in 'noisy' networks.
Select Auto to have the ZyAIR automatically use short preamble when all wireless clients support it,
otherwise the ZyAIR uses long preamble.
The ZyAIR and the wireless stations MUST use the same preamble mode in order
6.4

Configuring WEP Encryption

In order to configure and enable WEP encryption; click the WIRELESS link under ADVANCED to display
the Wireless screen.
The WEP Encryption, Authentication Method and the WEP key fields are not visible
when you enable Dynamic WEP Key, WPA or WPA-PSK in the 802.1x/WPA screen.
Wireless Security
ZyAIR G-500 Wireless Access Point User's Guide
to communicate.
6-3