ZyXEL NWA1121-NI User Guide - Page 71
Table 13, Label, Description
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Chapter 6 Wireless LAN Table 13 Wireless LAN > Wireless Settings: MBSSID (continued) LABEL Preamble Type DESCRIPTION Select Dynamic to have the AP automatically use short preamble when wireless adapters support it, otherwise the AP uses long preamble. RTS/CTS Threshold Extension Channel Protection Mode A-MPDU Aggregation Select Long if you are unsure what preamble mode the wireless adapters support, and to provide more reliable communications in busy wireless networks. (Request To Send) The threshold (number of bytes) for enabling RTS/CTS handshake. Data with its frame size larger than this value will perform the RTS/CTS handshake. Setting this attribute to be larger than the maximum MSDU (MAC service data unit) size turns off the RTS/CTS handshake. Setting this attribute to its smallest value (1) turns on the RTS/CTS handshake. You can use CTS to self or RTS-CTS protection mechanism to reduce conflicts with other wireless networks or hidden wireless clients. The throughput of RTS-CTS is much lower than CTS to self. Using this mode may decrease your wireless performance. This field is available only when 802.11 b/g/n is selected as the Wireless Mode. Select to enable A-MPDU aggregation. Short GI MCS Rate Message Protocol Data Unit (MPDU) aggregation collects Ethernet frames along with their 802.11n headers and wraps them in a 802.11n MAC header. This method is useful for increasing bandwidth throughput in environments that are prone to high error rates. This field is available only when 802.11 b/g/n is selected as the Wireless Mode. Select Enabled to use Short GI (Guard Interval). The guard interval is the gap introduced between data transmission from users in order to reduce interference. Reducing the GI increases data transfer rates but also increases interference. Increasing the GI reduces data transfer rates but also reduces interference. The MCS Rate table is available only when 802.11 b/g/n is selected in the Wireless Mode field. IEEE 802.11n supports many different data rates which are called MCS rates. MCS stands for Modulation and Coding Scheme. This is an 802.11n feature that increases the wireless network performance in terms of throughput. For each MCS Rate (0-15), select either Enabled to have the NWA1121-NI use the data rate. Clear the Enabled check box if you do not want the NWA1121-NI to use the data rate. Turn on the Auto option to have the NWA1121-NI set the data rates automatically to optimize the throughput. Apply Cancel Note: You can set the NWA1121-NI to use up to four MCS rates at a time. Click Apply to save your changes. Click Cancel to begin configuring this screen afresh. NWA1121-NI User's Guide 71