Can circular polarization and cross polarization be used on WLAN networks? What are their usage scenarios

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Circular polarization has not been applied to WLAN networks. Cross polarization (+45 and - 45 degrees) is used on outdoor post antennas. Cross-polarized antennas provide wireless signals at 2.4 GHz and 5 GHz frequency bands.

Other related questions:
Does the U1930 support polarity reversal signals
All U1900 series voice gateways, including U1930, support polarity reversal signals.

Usage scenarios of outdoor APs
Outdoor APs are applicable to open outdoor areas with high user densities, such as squares, residential communities, schools, dormitories, and enterprise campuses, as well as outdoor places that have high demands for wireless access, such as pedestrian malls.

Do FXS interfaces on a 4FXS1FXO interface card support polarity reversal
FXS interfaces on a 4FXS1FXO interface card support polarity reversal. This function is disabled by default.

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