Acknowledgement Timeout
AirOS has an auto-acknowledgement timeout algorithm which dynamically optimizes
the acknowledgement timeout value without user intervention. This is a critical feature
required for stabilizing long-distance outdoor links. The user also has the ability to
enter the value manually, but this is not recommended.
Distance: specify the distance value in miles using slider or enter the value manually.
The signal strength and throughput falls off with range. Changing the distance value
will change the ACK Timeout to the appropriate value of the distance.
ACK Timeout: specify the ACK Timeout. This is the amount of time the subscriber
station will wait to hear a acknowledgement response from the wireless device after
the data packet is transmitted. If the timeout is set too short or too long, it will result
poor connection and throughput performance.
Changing the ACK Timeout value will change the Distance to the appropriate distance
value for the ACK Timeout.
Auto Adjust control will enable the ACK Timeout Self-Configuration feature. If enabled,
ACK Timeout value will be derived dynamically using an algorithm similar to the
Conservative Rate Algorithm described above.
Antenna Settings
AirOS based devices have a possibility to switch the antenna polarities with a single
web management control. This is achieved by using Ubiquiti's patent-pending Adaptive
Antenna Polarity (AAP) technology.
AirOS devices often have multiple antenna options. In the case of the NanoStation,
there are 4 antenna modes:
1. Vertical Polarity
2. Horizontal Polairty
3. Adaptive: This mode chooses the best polarity dynamically. Adaptive – switches
adaptive antenna polarity mode which allows for the beam polarities to be switched
dynamically on the fly for improved performance in heavy noise environments.
4. External: This allows a connection to an external port / higher gain antenna
Antenna Alignment LED Thresholds
The LED's on the back of the AirOS Device can be made to light on when received
signal levels reach the values defined in the following fields. This allows a technician to
easily deploy an AirOS CPE without logging into the unit.
RSSI LED Thresholds specify the marginal value of RSSI which will switch on LEDs
indicating signal strength:
