D-Link DWS-1008 Product Manual - Page 196

How Channels Are Selected When a radio first comes up, if RF Auto-Tuning for channels is enabled, the initial channel selected will follow a uniform distribution of channels that spans the list of channels, rather than selecting the next sequential channel number. For example, the range of valid channels for 802.11a radios in the US is as follows: 40, 44, 48, 52, 56, 60, 64, and 68 On each DWS-1008, the first channel chosen will be random. Assuming that channel 60 is the first channel selected, the order of the channel selections will be as follows: Order: 2 5 8 3 6 1 4 7 Channel: 40 44 48 52 56 60 64 68 After these initial 8 channel selections are chosen, the pattern will repeat itself. Channel and Power Tuning RF Auto-Tuning can change the channel or power of a radio, to compensate for RF changes such as interference, or to maintain at least the minimum data transmit rate for associated clients. A radio continues to scan on its active data channel and on other channels and reports the results to its switch. Periodically, the switch examines these results to determine whether the channel or the power needs to be changed. Power Tuning By default, the switch evaluates the scan results for possible power changes every 300 seconds (5 minutes), and raises or lowers the power level if needed. If RF Auto-Tuning determines that a power change is needed on a radio, MSS ramps the power up or down until the new power level is reached. Ramp-up or ramp-down of the power occurs in 1dBm increments, at regular time intervals. The default interval is 60 seconds and is configurable. The power ramp amount (1dBm per interval) is not configurable. D-Link DWS-1008 User Manual 177