Netgear UTM25S Reference Manual 3.0.1-124 - Page 599

ProSecure Unified Threat Management (UTM) Appliance 3. Specify the settings as explained in the following table: Table 153. Advanced Wireless screen settings Setting Beacon Interval Description Enter an interval between 20 ms and 100 ms for each beacon transmission, which allows the wireless network module to synchronize the wireless network. The default setting is 100 ms. DTIM Interval Enter the Delivery Traffic Indication Message (DTIM) interval, also referred to as the data beacon rate, which indicates the period for the beacon DTIM in multiples of beacon intervals. This value needs to be between 1 and 255. The default setting is 2. RTS Threshold Enter the Request to Send (RTS) threshold. The default setting is 2346 bytes. If the packet size is equal to or less than the RTS threshold, the wireless network module uses the Carrier Sense Multiple Access with Collision Detection (CSMA/CD) mechanism, and the data frame is transmitted immediately after the silence period. If the packet size is larger than the RTS threshold, the wireless network module uses the CSMA with Collision Avoidance (CSMA/CA) mechanism. In this situation, the transmitting station sends an RTS packet to the receiving station and waits for the receiving station to return a Clear to Send (CTS) packet before sending the actual packet data. This method improves the performance but reduces the throughput. Fragmentation Threshold Enter the maximum packet size that is used for the fragmentation of data packets. Packets that are larger than the specified fragmentation length are broken up into smaller packets before being transmitted. The fragmentation threshold needs to be an even number. The default setting is 2346 bytes. Preamble Mode Specify the transmit preamble mode by making a selection from the drop-down list: • Long Preamble. A long transmit preamble might provide a more reliable connection or a slightly longer range. This is the default mode. • Short Preamble. A short transmit preamble gives better performance. • Auto Preamble. An automatic preamble gives a better overall performance by providing both long and short preambles. Protection Mode Specify the CTS-to-self protection mode (CTS stands for Clear to Send) by making a selection from the drop-down list: • None. CTS-to-self protection mode is disabled. This is the default mode. • CTS-To-Self-Protection. CTS-to-self protection mode is enabled. This mode increases the performance but reduces the throughput slightly. Power Save Enable To enable the Wi-Fi Multimedia (WMM) Power Save feature, select the Power Save Enable check box. This feature saves power for battery-powered equipment by increasing the efficiency and flexibility of data transmission. Clear the check box to disable the feature, which is the default setting. 4. Click Apply to save your settings. Wireless Network Module for the UTM9S and UTM25S 599