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ZyXEL P-330W User's Guide When your P-330W'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 P-330W will accept either type of authentication request and the P-330W will fall back to use open authentication if the shared key does not match. 5.4.2 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 P-330W and the wireless stations and to provide more reliable communication in 'noisy' networks.. Note: The P-330W and the wireless stations MUST use the same preamble mode in order to communicate. Figure 26 Wireless: Advanced Settings The following table describes the advanced wireless LAN labels in this screen. Table 18 Wireless: Advanced Settings LABEL DESCRIPTION Authentication Select Auto, Open System or Shared Key from the menu.. Type Preamble Type Select a preamble type from the drop-down list menu. Choices are Long or Short. The default setting is Long. Chapter 5 Wireless 52

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ZyXEL P-330W User’s Guide
Chapter 5 Wireless
52
When your P-330W'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 P-330W will accept either type of authentication
request and the P-330W will fall back to use open authentication if the shared key does not
match.
5.4.2
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 P-330W and the wireless stations and to provide more reliable communication in ‘noisy’
networks..
Figure 26
Wireless: Advanced Settings
The following table describes the advanced wireless LAN labels in this screen.
Note:
The P-330W and the wireless stations MUST
use the
same preamble mode in order to communicate.
Table 18
Wireless: Advanced Settings
LABEL
DESCRIPTION
Authentication
Type
Select Auto, Open System or Shared Key from the menu..
Preamble Type
Select a preamble type from the drop-down list menu. Choices are Long or Short.
The default setting is Long.