4-Channel Bi-Directional XLR Balanced Audio over Fiber Converter

The UF-XLR-4BA is a professional 4-channel bi-directional XLR balanced audio over fiber converter designed to transmit four channels of broadcast-quality analog audio in both forward and reverse directions over a single optical fiber link. It uses digital audio encoding and FPGA-based processing to transport balanced XLR audio between locations, with up to 20 km transmission over single-mode fiber in the standard configuration. The system is designed for professional AV, broadcast, rental and staging, theater, stadium, theme park, and other long-distance audio transmission applications.

4-Channel Bi-Directional XLR Balanced Audio over Fiber

The UF-XLR-4BA is a 4-channel bi-directional XLR balanced audio fiber converter that transmits professional analog audio in both directions over a single optical fiber link. Unlike a conventional one-way audio fiber converter, the UF-XLR-4BA supports four channels of forward audio and four channels of reverse audio, making it suitable for applications that require two-way audio communication between locations.

The system uses FPGA-based digital encoding/decoding and clock recovery technology to provide stable, high-quality audio transmission. It supports single-mode and multimode fiber configurations, with standard transmission distances of up to 20 km over single-mode fiber and 1 km over multimode fiber.

Key Features

• 4-channel bi-directional XLR audio transmission

• Four channels forward + four channels reverse

• Broadcast-quality balanced analog audio

• Digital audio encoding/decoding with FPGA processing

• Up to 20 km over single-mode fiber

• Up to 1 km over multimode fiber

• Longer-distance configurations available

• 100 dB SNR

• 101 dB dynamic bandwidth

• Automatic high-pass filtering and DC offset isolation

• Intelligent noise control

• 6 kV differential-mode surge protection for the audio interface

• Plug-and-play operation

• No software configuration or optical adjustment required

• AC 110–240V power input

• Rack-mount or desktop installation

Why Use Bi-Directional XLR Audio over Fiber?

Many professional AV systems need to send audio in both directions between two locations. A conventional one-way audio fiber converter is suitable for audio distribution, but it cannot provide a return audio path.

The UF-XLR-4BA solves this requirement by providing four forward audio channels and four reverse audio channels over the same fiber link.

Two-Way Audio Between Remote Locations

The converter allows audio signals to travel in both directions between the transmitter and receiver locations, reducing the need for separate fiber links for forward and return audio paths.

Long-Distance Audio Transmission

Optical fiber allows balanced XLR audio to be transported over long distances while providing electrical isolation between the two locations. The standard single-mode configuration supports up to 20 km transmission.

Multi-Channel Audio Communication

Four audio channels are available in each direction, providing an effective solution for professional AV systems that need multiple independent audio paths between two locations.

Reduced Cabling Complexity

By carrying forward and reverse audio channels through the same optical link, the UF-XLR-4BA can simplify fiber infrastructure for two-way professional audio systems.

Reliable Professional AV Transmission

FPGA-based digital encoding/decoding, clock recovery, noise control, and optical transmission help maintain stable audio communication over long-distance fiber links.

How Does the UF-XLR-4BA Work?

The UF-XLR-4BA uses a matched transmitter and receiver pair to transport four channels of balanced XLR audio in both directions over one optical fiber link.

Location A → 4-Channel Forward Audio → Optical Fiber → Location B

Location B → 4-Channel Reverse Audio → Optical Fiber → Location A

The system works as follows:

1. Balanced XLR audio signals enter the transmitter and receiver through their respective XLR interfaces.

2. The analog audio signals are digitally encoded using FPGA-based processing.

3. Forward and reverse audio data are transported through the optical fiber link.

4. The receiving side decodes the digital audio data and converts it back to balanced analog XLR audio.

5. Four independent audio channels are available in each direction.

This architecture provides 8 audio paths in total: 4 forward channels + 4 reverse channels, while using one optical fiber link.

►     Support 4-Channel balanced audio forward and backward transmission 

►     Broadcast standard analog balanced audio 

►     Using FPGA, digital coding/decoding and clock recovery technology, high integration and high stability 

►     Audio interface is XLR Cannon head balance interface, high dynamic range of 100dB 

►     Automatic high-pass filtering, isolation of DC offset 

►     Intelligent noise control system. For soft rising or falling slant waves and analog noise with 100dB SNR in blast-free operation 

►     Audio interface is in level 3 lightning protection, up to iec61000-4-5 (8/20μs) differential mode :6KV 

►     Single and multi-mode compatible, multi-mode transmission distance is 1KM, single-mode transmission distance 20KM, supporting customized transmission distance of up to 100KM 

►     LED status indicator to monitor the running status of the device 

►     Plug and play, no setup required 

►     Devices are used in pair. Note that devices are distinguished between transmitter and receiver

Applications

The UF-XLR-4BA is designed for professional AV and audio systems that require multi-channel, bi-directional XLR audio transmission over optical fiber.

Broadcast & Studio

• Broadcast studios

• TV and radio production

• Outside broadcasting

• Studio audio systems

• Remote production facilities

Rental & Staging

• Live event production

• Rental AV systems

• Stage audio systems

• Event venues

• Touring production

Theater & Performing Arts

• Theater audio systems

• Performing arts venues

• Stage communication systems

• Large venue audio distribution

Stadiums & Theme Parks

• Stadium AV systems

• Theme park audio systems

• Large entertainment venues

• Distributed audio systems

Professional AV & Two-Way Audio

• Professional AV systems

• Two-way audio communication

• Multi-location audio links

• Long-distance XLR audio interconnection

CCTV & Specialized Audio

• CCTV audio transmission

• Security monitoring systems

• Specialized audio links

• Remote audio monitoring

• Download FileName：UF-XLR-4BA 4Ch BIDI XLR Audio Fiber Converter Datasheet V1.0.pdf Size： 903KB

Frequently Asked Questions

What is the UF-XLR-4BA?

The UF-XLR-4BA is a 4-channel bi-directional XLR balanced audio over fiber converter designed to transmit professional analog audio in both directions over an optical fiber link.

How many audio channels does the UF-XLR-4BA support?

It supports four forward audio channels and four reverse audio channels, providing eight audio paths in total.

Is the UF-XLR-4BA truly bi-directional?

Yes. Four channels of balanced XLR audio can be transmitted in the forward direction, while another four channels can be transmitted in the reverse direction through the same optical fiber link.

What is the difference between the UF-XLR-4A and UF-XLR-4BA?

The UF-XLR-4A supports four-channel forward audio transmission only. The UF-XLR-4BA supports four-channel audio transmission in both forward and reverse directions.

What is the maximum transmission distance?

The standard configuration supports up to 20 km over single-mode fiber and up to 1 km over multimode fiber. Longer-distance configurations are available for specific projects.

What type of fiber does the UF-XLR-4BA use?

The system supports single-mode and multimode optical fiber configurations. The standard single-mode version uses 9/125 μm fiber.

Can the UF-XLR-4BA use one fiber link for both directions?

Yes. The system is designed to transmit forward and reverse audio channels through the optical fiber link.

Does the converter require software configuration?

No. The UF-XLR-4BA uses a plug-and-play design and does not require software configuration or optical adjustment during normal installation.

What XLR interfaces are provided?

The system uses balanced XLR audio interfaces. The transmitter provides female XLR inputs and the receiver provides male XLR outputs according to the standard configuration.

What applications is the UF-XLR-4BA designed for?

Typical applications include broadcast and studio systems, rental and staging, theaters, stadiums, theme parks, professional AV systems, two-way audio links, and CCTV audio transmission.