ZyXEL ZyWALL ATP700 User Guide - Page 668
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Chapter 34 Object Table 264 Configuration > Object > AP Profile > Add/Edit Radio Profile (continued) LABEL DESCRIPTION Country Code Select the country code of APs that are connected to the Zyxel Device to be the same as where the Zyxel Device is located/installed. The available channels vary depending on the country you select. Be sure to select the correct/same country for both radios on an AP and all connected APs, in order to prevent roaming failure and interference to other systems. Note: For US and Canada models, country code is fixed to US or Canada respectively and is not user selectable. Guard Interval This field is available only when the channel width is 20/40MHz or 20/40/80MHz. Set the guard interval for this radio profile to either Short or Long. Enable A-MPDU Aggregation A-MPDU Limit A-MPDU Subframe Enable A-MSDU Aggregation A-MSDU Limit RTS/CTS Threshold The guard interval is the gap introduced between data transmission from users in order to reduce interference. Reducing the interval increases data transfer rates but also increases interference. Increasing the interval reduces data transfer rates but also reduces interference. Select this to enable A-MPDU aggregation. 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. Enter the maximum frame size to be aggregated. Enter the maximum number of frames to be aggregated each time. Select this to enable A-MSDU aggregation. Mac Service Data Unit (MSDU) aggregation collects Ethernet frames without any of their 802.11n headers and wraps the header-less payload in a single 802.11n MAC header. This method is useful for increasing bandwidth throughput. It is also more efficient than A-MPDU except in environments that are prone to high error rates. Enter the maximum frame size to be aggregated. 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). Beacon Interval DTIM Enable Signal 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. When a wirelessly networked device sends a beacon, it includes with it a beacon interval. This specifies the time period before the device sends the beacon again. The interval tells receiving devices on the network how long they can wait in low-power mode before waking up to handle the beacon. A high value helps save current consumption of the access point. Delivery Traffic Indication Message (DTIM) is the time period after which broadcast and multicast packets are transmitted to mobile clients in the Active Power Management mode. A high DTIM value can cause clients to lose connectivity with the network. This value can be set from 1 to 255. Select the check box to use the signal threshold to ensure wireless clients receive good throughput. This allows only wireless clients with a strong signal to connect to the AP. Clear the check box to not require wireless clients to have a minimum signal strength to connect to the AP. ZyWALL ATP Series User's Guide 668