ZyXEL NWA-3163 User Guide - Page 141
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Chapter 8 Wireless Screen Table 26 Wireless: MBSSID LABEL DESCRIPTION Disable channel switching for DFS This field displays only when you select 802.11a or 802.11n/a in the 802.11 Radio Mode field. Select this if you do not want to use DFS (Dynamic Frequency Selection). Super Mode DFS (dynamic frequency selection) allows an AP to detect other devices in the same channel. If there is another device using the same channel, the AP changes to a different channel, so that it can avoid interference with radar systems or other wireless networks. (For NWA-3160 and NWA-3163 only) Channel ID Select this to improve data throughput on the WLAN by enabling fast frame and packet bursting. Set the operating frequency/channel depending on your particular region. To manually set the NWA to use a channel, select a channel from the drop-down list box. Click MAINTENANCE and then the Channel Usage tab to open the Channel Usage screen to make sure the channel is not already used by another AP or independent peer-to-peer wireless network. Disable DCS to unlock To have the NWA automatically select a channel, click Scan instead. This appears if the DCS feature is enabled. Click this to disable DCS and select a channel ID manually. Note: DCS is Disabled by default Short GI This field is available only when 802.11n/g or 802.11n/a is selected as the 802.11 Radio Mode. Select Enable 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. A-MPDU Aggregation This field is available only when 802.11n/g or 802.11n/a is selected as the 802.11 Radio Mode. Select Enable to allow the grouping of several A-MSDUs (Aggregate MAC Service Data Units) into one large A-MPDU (Aggregate MAC Protocol Data Unit). This function allows faster data transfer rates. RTS/CTS Threshold Use RTS/CTS to reduce data collisions on the wireless network if you have wireless clients that are associated with the same AP but out of range of one another. When enabled, a wireless client sends an RTS (Request To Send) and then waits for a CTS (Clear To Send) before it transmits. This stops wireless clients from transmitting packets at the same time (and causing data collisions). Fragmentation Threshold A wireless client sends an RTS for all packets larger than the number (of bytes) that you enter here. Set the RTS/CTS equal to or higher than the fragmentation threshold to turn RTS/CTS off. The threshold (number of bytes) for the fragmentation boundary for directed messages. It is the maximum data fragment size that can be sent. Enter an even number between 256 and 2346. NWA-3160 Series User's Guide 141