1. Introduction
This manual provides comprehensive instructions for the installation, operation, maintenance, and troubleshooting of the Ubiquiti AIRFIBER 5 GHz Carrier Backhaul Radio, model AF-5X (AF5XUS). The AF-5X is a modular radio system designed for high-performance wireless backhaul links in the 5 GHz frequency band, offering robust connectivity and deployment flexibility.
2. Product Overview
The Ubiquiti AF-5X is engineered for carrier-class performance, enabling efficient data transmission over long distances. It is compatible with various Ubiquiti antennas, allowing for customized backhaul solutions.

Figure 1: Front view of the Ubiquiti AIRFIBER 5 GHz Carrier Backhaul Radio AF-5X, showing the Ubiquiti logo, LED indicators for Link, GPS, Management, Data, and Power, and the 'airFiber 5X' branding.
Video 1: An animated video demonstrating the compatibility of the Ubiquiti AF-5X radio with various airFiber Antennas (AF-5G23-S45, AF-5G30-S45, AF-5G34-S45) and RocketDish antennas (RD-5G30, RD-5G34), illustrating how the radio integrates with these parabolic dishes for backhaul links.
3. Features
- Engineered for Performance: Designed for high-throughput and reliable wireless backhaul.
- Deployment Flexibility: Modular design compatible with various Ubiquiti antennas for diverse applications.
- 5 GHz Carrier Backhaul: Operates in the 5 GHz frequency band for carrier-grade links.
- Optimal Operation in Unlicensed Bands: Optimized for performance in unlicensed spectrums.
4. Setup
4.1. Package Contents
- AirFiber 5GHZ Radio Unit (AF-5XUS)
Note: Antennas, mounting hardware, and Power over Ethernet (PoE) injectors are typically sold separately and are required for a complete installation.
4.2. Antenna Attachment
The AF-5X radio is designed to integrate with compatible Ubiquiti airFiber Antennas or RocketDish antennas. Ensure the radio is securely mounted to the antenna feed horn according to the specific antenna's instructions. Connect the RF cables from the radio to the antenna ports, ensuring proper polarization and tight connections.
4.3. Power and Network Connection
- Connect an Ethernet cable from the AF-5X's Ethernet port to the PoE port of a compatible Ubiquiti PoE adapter.
- Connect another Ethernet cable from the LAN port of the PoE adapter to your network switch or router.
- Plug the power cord of the PoE adapter into a power outlet.
Verify that the Power LED on the AF-5X illuminates, indicating successful power-up.
4.4. Mounting and Alignment
Mount the assembled radio and antenna securely to a pole or tower using appropriate mounting hardware. For optimal performance, precise alignment between two AF-5X units forming a backhaul link is critical. Use the built-in alignment tools in the device's software interface and physical adjustments to achieve the strongest possible signal strength.
5. Operation
5.1. Initial Configuration
Access the device's web-based management interface by connecting your computer to the same network segment as the AF-5X. Refer to the device's default IP address and login credentials provided in the quick start guide or on the device label. Configure network settings, wireless parameters (frequency, channel width, transmit power), and security settings.
5.2. LED Indicators
The AF-5X features several LED indicators to provide status information:
- LINK: Indicates the status of the wireless link. Multiple LEDs illuminate to show signal strength.
- GPS: Indicates GPS signal acquisition and synchronization status.
- MGMT: Indicates activity on the management Ethernet port.
- DATA: Indicates activity on the data Ethernet port.
- Power: Indicates the device is powered on.
6. Maintenance
Regular maintenance ensures optimal performance and longevity of your AF-5X radio.
- Firmware Updates: Periodically check the Ubiquiti website for the latest firmware versions. Updating firmware can provide new features, performance improvements, and security enhancements.
- Physical Inspection: Annually inspect the radio, antenna, and mounting hardware for any signs of wear, corrosion, or damage. Ensure all connections are secure.
- Environmental Considerations: Keep the device free from excessive dust, moisture, and extreme temperatures. Ensure proper ventilation if installed in an enclosure.
7. Troubleshooting
If you encounter issues with your AF-5X radio, consider the following troubleshooting steps:
- No Power: Verify the PoE adapter is connected correctly and receiving power. Check all Ethernet cable connections.
- No Link: Ensure both AF-5X units are powered on and properly aligned. Check RF cable connections between the radio and antenna. Verify wireless configuration settings (frequency, channel, security).
- Poor Performance: Re-check antenna alignment. Look for potential sources of interference in the 5 GHz band. Consider adjusting channel width or frequency. Ensure firmware is up to date.
- Cannot Access Management Interface: Verify your computer's network settings are compatible with the device's IP address. Try resetting the device to factory defaults (refer to the quick start guide for the reset procedure).
- Persistent Issues: If problems persist, consult the Ubiquiti support resources or contact their technical support team.
8. Specifications
| Attribute | Value |
|---|---|
| Product Dimensions | 0.5 x 0.5 x 0.5 inches |
| Item Weight | 2.35 pounds |
| ASIN | B00W215Z96 |
| Item Model Number | AF5XUS |
| Date First Available | April 13, 2015 |
| Manufacturer | Ubiquiti |
| Brand | Ubiquiti Networks |
| Model Name | AF-5XHD |
| Special Feature | WPS |
| Frequency Band Class | Quad-Band |
| Wireless Communication Standard | 5.8 GHz Radio Frequency |
| Compatible Devices | Personal Computer |
| Recommended Uses For Product | Home |
| Connectivity Technology | Ethernet |
| Color | White |
9. What's in the Box
- AirFiber 5GHZ Radio Unit
10. Warranty and Support
Ubiquiti Networks products are covered by a limited warranty. For detailed warranty information, technical support, and additional resources, please visit the official Ubiquiti Networks website. Ensure you register your product for warranty purposes and keep your proof of purchase.