D-Link DWS-1008 User Manual
1
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.
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