Ubiquiti airFiber 4X
4 GHz Carrier Backhaul Radio
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The airFiber X features up to 17.1 Mbps/MHz of industry-leading spectral efficiency and uses proprietary Hybrid Division Duplexing technology to achieve the highest TDD throughput available for long-range, PtP links.
Ubiquiti Networks introduces the airFiber AF-4X, Ubiquiti’s first licensed spectrum radio designed for the public safety sector. It meets the growing need of broadband capacity and optimizes use of the 4.9 GHz radio band with its industry-leading spectral efficiency and TDD throughput. The AF-4X allows you to customize airFiber backhaul links or upgrade existing Rocket Point-to-Point (PtP) links.
Engineered for Performance
Ubiquiti's INVICTUS custom silicon and proprietary radio architecture are designed specifically for long-distance, outdoor wireless applications. Our INVICTUS core communications processing engine surpasses all of the limitations inherent to generic Wi-Fi chips to provide superior performance, long-range capability, DFS flexibility, and higher delivered throughput.
The airFiber X features industry-leading spectral efficiency of up to 17.1 Mbps/MHz, line-rate data packet processing of up to 525 Mbps of real data throughput, and innovative xtreme Range Technology (xRT) for up to 200+ km in range.
The AF-4X supports ± 45° slant polarization for improved noise immunity and Signal-to-Noise Ratio (SNR). The compact form factor of the airFiber X allows it to fit into the radio mount of Ubiquiti antennas, so installation requires no special tools.
The airFiber X antennas are purpose-built with 45° slant polarity for seamless integration with the airFiber AF-4X.
Carrier Backhaul for the World
Deploy the 2.4, 3, or 5 GHz model that meets your specific spectrum requirements, anywhere around the world. The airFiber X features multiple channel width options to suit your deployment needs – up to 11 different channel sizes available for the AF-2X or AF-3X.
The AF-4X covers the 4.9 GHz spectrum for public safety. Additional frequencies, from 4.7 GHz to 4.9 GHz, are supported in Europe and other regions (subject to local country regulations). The AF-4X uses a proprietary radio communications protocol with AES-128 encryption to help ensure communication channels are secure.
Optimal Operation and Channel Configuration
The AF-4X supports up to 11 different channel width sizes* to suit your deployment needs. You can configure independent TX and RX channel frequencies and place them anywhere within the radio band, and the channel centers are selectable in 1 MHz increments. You also have the ability to program different uplink and downlink duty cycles to support asymmetric traffic requirements.
Ultra-Low Latency with HDD Technology
The AF-4X is designed to provide the highest TDD throughput and lowest latency available using proprietary Hybrid Division Duplexing (HDD) technology.
With tower space at a premium, the importance of being able to co-locate equipment is becoming an essential attribute for modern wireless networks. The airFiber X is engineered to permit multiple radios to operate side by side, allowing maximum spectral efficiency.
Precise GPS frame synchronization enables co-located airFiber X radios to transmit and receive data without interfering with each other, enabling better frequency reuse and increased network stability.
Clean Power Output
Using advanced digital signal processing, the innovative AF-4X radio design has an ultra-clean transmitter output, reducing broadband noise, facilitating co-location, and enabling higher‑order modulations like 1024QAM for greater throughput.
The 2.4 GHz frequency band is free to use, worldwide; and with its proprietary protocol, the AF-2X increases both range and delivered throughput in this popular band.
The 3 GHz frequency band offers interference-free operation, enabling the AF-3X to provide a high-reliability backhaul solution, although a license may be required in some regions.
The AF-5X covers the entire, license-free, 5 GHz spectrum and includes DFS approval. Anyone around the world can deploy and operate the AF-5X in the 5 GHz range practically anywhere they choose (subject to local country regulations).
Optimal Operation in Unlicensed Bands
Channel width flexibility allows you to independently configure TX and RX channel frequencies and place them anywhere within the radio band to avoid local interference. You also have the ability to program different uplink and downlink duty cycles to support asymmetric traffic requirements.
You also have the ability to program different uplink and downlink duty cycles to support asymmetric traffic requirements.
|airFiber 4X Specification|
|Dimensions||224 x 82 x 48 mm (8.82 x 3.23 x 1.89")|
|Weight||0.35 kg (0.77 lb)|
|RF Connectors||(2) RP-SMA Weatherproof (CH0, CH1)
(1) SMA Weatherproof (GPS)
|GPS Antenna||External, Magnetic Base|
|Power Supply||24V, 1A PoE Gigabit Adapter (Included)|
|Power Method||Passive Power over Ethernet
Pins 1, 2, 4, 5 (+) and Pins 7, 8, 3, 6 (-)
|Max. Power Consumption||12W|
|Supported Voltage Range||19-29VDC|
|Mounting||airFiber X Mount (Rocket Mount Compatible)
GPS Pole Mount (Included)
|Certifications||CE, FCC, IC|
|Operating Temperature||-40 to 55° C (-40 to 131° F)|
|Data Port||(1) 10/100/1000 Ethernet Port|
|Management Port||(1) 10/100 Ethernet Port|
|Maximum Throughput||500+ Mbps1|
|Maximum Range||200+ km1|
|Frequency Range||FCC: 4940 - 4990 MHz
IC: 4940 - 4990 MHz
ETSI: 4700 - 4990 MHz
Other Regions: 4700 - 4990 MHz2
|Max. Conducted TX Power||29 dBm2 (Dependent on Regulatory Region)|
|Frequency Accuracy||± 2.5 ppm without GPS Synchronization
± 0.2 ppm with GPS Synchronization
|Channel Bandwidth||3.5/5/7/10/14/20/28/30/40/50/56 MHz Selectable3
Programmable Uplink and Downlink Duty Cycles
1 Throughput and range values may vary depending on the environmental conditions.
2 For region-specific details, refer to the Compliance chapter of the airFiber X User Guide at downloads.ubnt.com/airfiber
3 Channel widths may vary according to country/region regulations.
|airFiber 4X Suggested Max. TX Power|
|8x||19 - 20 dBm|
|6x||21 - 22 dBm|
|4x||23 - 24 dBm|
|airFiber 4X Receive Sensitivity|
|8x||256QAM MIMO||-66 dBm||-64 dBm||-62 dBm||-61 dBm||-60 dBm|
|6x||64QAM MIMO||-74 dBm||-71 dBm||-69 dBm||-68 dBm||-67 dBm|
|4x||16QAM MIMO||-81 dBm||-78 dBm||-76 dBm||-75 dBm||-74 dBm|
|2x||QPSK MIMO||-88 dBm||-85 dBm||-83 dBm||-82 dBm||-81 dBm|
|1x||½ Rate QPSK xRT||-90 dBm||-87 dBm||-85 dBm||-84 dBm||-83 dBm|
Loaded with Powerful Features
airOS F is an intuitive, versatile, highly developed Ubiquiti firmware technology that resides on airFiber. It is exceptionally intuitive and was designed to require no training to operate. Behind the user interface is a powerful firmware architecture which enables hi-performance network backhauls.
airOS F Tools
- Speed Test
- Antenna Alignment
- Device Discovery
- Site Survey
airOS F Integrated Technologies
airFiber's purpose-built hardware provides superior wireless performance, higher capacity, and lower latency. Unlike standard WiFi protocols, Ubiquiti airFiber's Hybrid Division Duplex (HDD) provides the best of both worlds — latency performance of Frequency Division Duplex (FDD) with the spectral efficiency of Time Division Duplex (TDD).
Wireless Network Configuration
- Transmit Frequency
- Receive Frequency
- Output Power
- Modulation Rate
- Automatic Modulation Rate Adaptation
- Duplex: Half or Full
- High/Low RX Gain
- Wireless Security: AES-128
- Transparent Layer 2 Bridge
- In-Band Management
- Management VLAN
- Automatic check for airOS F Updates
- Configuration Test Mode
- Firmware Recovery via TFTP
- Reset to Factory Defaults
- Configuration Management: Backup/Restore Device Configuration
- Administrator/Read-Only Access
- WEB/SSH/Telnet Access
- Dynamic DNS
- NTP Client
- Ping Watchdog
- SNMP v1 Support
- System Log: Local/Remote
- Full Statistical Performance Reporting
- Speed Test
- Antenna Alignment
- Device Discovery
Download the Ubiquiti airFiber 4X Datasheet (PDF).
- Pricing and product availability subject to change without notice.
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