ZyXEL NBG6503 User Guide - Page 213
Preamble Type, Wireless Security Overview
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Appendix C Wireless LANs If the Fragmentation Threshold value is smaller than the RTS/CTS value (see previously) you set then the RTS (Request To Send)/CTS (Clear to Send) handshake will never occur as data frames will be fragmented before they reach RTS/CTS size. Preamble Type 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 Router uses long preamble. Note: The wireless devices MUST use the same preamble mode in order to communicate. Wireless Security Overview Wireless security is vital to your network to protect wireless communication between wireless clients, access points and the wired network. Wireless security methods available on the Router are data encryption, wireless client authentication, restricting access by device MAC address and hiding the Router identity. The following figure shows the relative effectiveness of these wireless security methods available on your Router. Table 82 Wireless Security Levels SECURITY LEVEL SECURITY TYPE Least Secure Unique SSID (Default) Unique SSID with Hide SSID Enabled MAC Address Filtering WEP Encryption IEEE802.1x EAP with RADIUS Server Authentication Wi-Fi Protected Access (WPA) WPA2 Most Secure Note: You must enable the same wireless security settings on the Router and on all wireless clients that you want to associate with it. NBG6503 User's Guide 213