This article explains the different settings for Track Radio Link, found in the Advanced tab in the airFiber WebUI in airOS F v3.X. Track Radio Link operation is different in airOS F v4.X, if you want to use it in v4.X please read this article. It will review the three possible modes, the different configurations available as well as a couple of examples of what two different settings would look like in real life.
Table of Contents
Track Radio Link feature allows the radio to disable the DATA interface for a specified time when the selected condition happens. This option can be configured under the Advanced tab as seen in the image below.
The Track Radio Link mode will depend on how the device is managed.
- Disabled means that Track Radio Link is disabled
- Use Timeout Duration should be used when IN-band management is being used.
- Enabled should be used when OUT-band management is being used. The Track Radio Link option is enabled without timers, so the Data port’s Ethernet link follows the RF link state exactly. If the RF link goes down, then the Ethernet link goes down and remains down until the RF link goes back up.
There are several configurable options the user will see in the interface. Find each explanation below:
- Link Off Duration: The Link Off Duration timer controls the length of time the Data port’s Ethernet link will be down if the RF link goes down. Enter the number of seconds that the Ethernet link should be offline. For example, if this is set to 10 seconds, then when the RF link goes down, the Ethernet link will go down and remain down for 10 seconds (regardless of the RF link state), and then it will go back up.
- Link Off Spacing: The Link Off Spacing timer controls the length of time the airFiber will wait before allowing the Data port’s Ethernet link to go down for a second time if the RF link goes down again. Enter the minimum interval (in seconds) between offline events of the Ethernet link, regardless of the RF link status. The value for Link Off Spacing should be larger than the value for Link Off Duration, and it should be enough time for the operator to access the airFiber, make any configuration changes, and apply those changes.
- Minimum TX Capacity: Set the minimum allowed Tx capacity before the link goes down. If the Tx capacity goes below the specified threshold Link Off will be triggered. When Tx capacity goes above the specified threshold for a period of time higher than the Capacity Window the DATA port will go back up.
- Minimum RX Capacity: Set the minimum allowed Rx capacity before the link goes down. If the Rx capacity goes below the specified threshold Link Off will be triggered. When Rx capacity goes above the specified threshold for a period of time higher than the Capacity Window the DATA port will go back up.
- Capacity Window: Set the time the capacity has to be back up above the minimum capacity before the Data link state will change and the port comes back up. This is useful to make it wait until the link stabilizes before putting it back into service. It will keep the link from going up and down if the capacity is still fluctuating.
Example 1: Trigger Link Off when the RF link goes down.
In this example Link Off Duration is set to 20 seconds, Link Off Spacing is set 120 seconds. The Data port’s Ethernet link will be initially disconnected when the RF link first goes down. That event will start a 120-second timer. The RF link goes back up after 10 seconds; however, that does not affect the Ethernet link. The Ethernet link will remain offline for 20 seconds and then come back online. The RF link goes down again after 60 seconds; however, that does not affect the Ethernet link. The Ethernet link will then remain online until the 120-second timer expires.
Example 2: Trigger Link Off when the Tx or Rx RF link capacity is below 300Mbps
In this example Minimum Tx and Rx Capacity are set to 300Mbps and Capacity Window is set to 10 seconds. The Data port’s Ethernet link will be initially disconnected when the RF link goes below 300Mbps in the Rx OR Tx Capacity. When the Rx AND Tx Capacity goes above 300Mbps for at least 10 seconds (Capacity Window time) the DATA port will be enabled again.