Compex Systems 802.11N - Manual (Page 36)

Channel Spectrum Width
20M represents the data transmitted at a bandwidth of 20MHz. 20/40MHz represents the
data transmitted at either 20MHz or 40MHz. In very noisy environment it automatically
fall back to 20MHz to be more resilient to the interference. In situation when auto fall
back did not happened, manually changing channel spectrum width to 20MHz will to
help reduce interference on the link and improve performance.
* Note: 40MHz bandwidth is non-standard for 802.11n/g mode operation. If you
experience unstable performance change Channel Spectrum Width to 20M.
Channel – Frequency
This is frequency selection you can set for device to operate on. The frequency range
available depends on the country domain you select in Country Code. For 5GHz frequency
range some have DFS characteristics earmarked by regulations. Selecting one of these
frequencies for operation may affect and delay of 2 minutes or more (possibly up to 10
minutes in some situations) for device to attempt to establish a connection.
Auto: When checked, during startup, device automatically select the least interfering channels
(or frequency) for the operation.
Data Rate
Data Rates consist of both the legacy rates and the MCS (Modulation Coding Scheme –
Only for 802.11n) rates.
6 – 54Mbps are Legacy Rates
MCS0 to MCS7 are 802.11n rates, which uses only 1 stream.
MCS8 to MCS15 are 802.11n rates, which uses 2 streams.
Auto: The data rate selected will follow an advanced rate algorithm that takes into condition the
amount of errors at the data rate and fine tune to the best data rate it can use.
Transmit Power
The maximum transmit power displayed is determined by the country code and the
maximum transmit power of the miniPCI that is being used.
*Note on changing channels:
When the operator changes the channels and if this new frequency have higher
power output permitted by regulation, the power previously selected low power
level will remains unchanged. You need to readjust the power level to in order to take
advantage higher output power available for the channel
.
Rate Aggressiveness
Allows user to reduce or increase transmit rate while still remain in Fully Auto Algorithm.
There are 2 scenarios that Rate Aggressiveness is useful. Environment might be noisy at
times. Lower the throughput will ensure better stability. Rate Aggressiveness allows device
to reduce the transmit rate, so range or power can be higher. Choose a range of value
from -3,-2,-1.
Environment might be free of interference. But the fully auto algorithm might give low
throughput. Increase Rate Aggressiveness will increase transmit rate in this case to get
higher throughput. Choose a range of value from +3, +2, +1.