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| Automatic Frequency Selection |
| The operator may configure up to 20 different frequencies at the BSU and SUs. If the BSU detects a loss in performance on the frequency being used currently, and if this problem cannot be bought under control with ARQ, Adaptive Coding and Modulation or the other mechanisms in place, then it initiates a frequency change process. Once the BSU changes frequency, the SU automatically initiates a frequency search process until it locks on to the new frequency that the BSU is using. This mechanism is useful in the following situations: |
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- When deployed in the License Exempt bands such as the 5 GHz bands, AFS provides a way for the system to automatically change frequencies if the current frequency becomes un-usable due to interference.
- AFS can be used to provide automatic backup in case the primary BSU fails and there is a secondary BSU present. In this case, the SUs will automatically lock to the signal coming from the secondary BSU if they detect a loss of signal from the primary BSU.
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