You may have heard the term HDBaseT before, especially in discussions about HDMI and audiovisual signal extension. But how does HDBaseT actually work, and what makes it different from HDMI?
What is HDBaseT?
HDBaseT is a transmission technology that sends HDMI (or other AV signals), Ethernet, power, and control signals over long distances using a single Ethernet cable. Developed by the HDBaseT Alliance, which includes industry giants like Samsung, LG, Sony Pictures, and Valens, it enables reliable, uncompressed transmission beyond the capabilities of standard AV cables.
To ensure stable transmission, manufacturers often recommend using certified Ethernet cables with HDBaseT devices. A key feature of this technology is HDBaseT 5Play, which transmits five essential signals—audio/video, Ethernet, power, USB data, and control—through one Ethernet cable.
HDBaseT also supports Power over HDBaseT (PoH), which is similar to Power over Ethernet (PoE). Both technologies allow the transmission of power alongside data, but PoH specifically caters to AV devices, delivering higher wattage suitable for displays or projectors.
HDBaseT Versions
The latest version, HDBaseT 3.0, released in 2019, supports 4K at 60Hz resolution, USB 2.0, and 1Gbps Ethernet data rates, requiring at least CAT6 cables for transmission. Meanwhile, HDBaseT 2.0, introduced in 2013, supports 4K at 30Hz and USB 2.0. Each version offers varying support for AV formats, standards, and power requirements, allowing flexibility depending on the application.
Benefits of HDBaseT
Long Distance Transmission: HDBaseT can transmit signals up to 100m (328ft), far surpassing the range of HDMI or DisplayPort, which are limited to much shorter distances and only carry audio and video signals.
HDBaseT 5Play: The core 5Play feature integrates AV, Ethernet, power, data, and control signals over a single cable, making installation simpler and more cost-effective with widely available Ethernet cables.
Uncompressed Video: HDBaseT supports uncompressed signal transmission, providing pristine image quality, especially important in fields like healthcare and precision manufacturing.
HDBaseT Devices and Use Cases
HDBaseT Extender (Transmitter/Receiver)
An HDBaseT extender kit consists of two main devices: a transmitter and a receiver. The transmitter sends signals over an Ethernet cable to the receiver. In some setups, like when using an HDBaseT-enabled projector, only a transmitter is needed, as the projector itself functions as the receiver.
For instance, remote education systems often employ HDBaseT extenders to transmit multiple signals without the hassle of using several cables.
4K 60Hz HDBaseT HDMI® Extender 328ft - HE02EX
Healthcare environments also benefit from HDBaseT's uncompressed signal transmission, which is crucial for the accurate display of medical images in PACS (Picture Archiving and Communication Systems). Medical imaging workstations can receive high-quality images that are distributed efficiently to clinics or stored in databases via the network.
4K 60Hz HDBaseT HDMI® Extender with KVM - HE02U-4K6G
- Resolution up to 4096/ 3840 x2160@60Hz 4:4:4.
- Signal extension up to 100m for 4096 x 2160@60Hz.
- Built-in 4ports USB2.0 at the RX unit for USB cameras, flash drives, keyboards/mouse, etc.
- Supports Ethernet transmission.
- Supports CEC passthrough.
HDBaseT Splitter
In addition to extenders, HDBaseT splitters (also called distribution amplifiers) allow you to send video signals from one source to multiple displays, ideal for settings like classrooms, conference rooms, and large event venues where the same content needs to be shown on multiple screens simultaneously.
HDBaseT Matrix Switch
An HDBaseT matrix switch enables the distribution and switching of multiple AV signals across different sources and displays. These systems are commonly found in corporate environments, control rooms, and large entertainment venues, where complex AV setups are required.
HDBaseT vs. AV over IP
Though both HDBaseT and AV over IP are used for AV signal distribution, they differ in key areas:
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Transmission Technology: HDBaseT transmits uncompressed, zero-latency AV signals, making it ideal for projects requiring high-quality, real-time images. On the other hand, AV over IP compresses video and transmits it in packets, which can introduce some latency, though it allows for more flexible networked setups.
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Distance: HDBaseT can transmit signals up to 328ft (100m), while AV over IP can cover even longer distances with the help of repeaters, making it more suitable for larger installations.
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Resolution Support: Both HDBaseT and AV over IP support 4K resolutions. However, HDBaseT lacks a built-in scaler, meaning that all displays must support the same resolution, while AV over IP allows resolution scaling for different outputs.
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Expandability: HDBaseT relies on Valens chips, limiting expansion to other HDBaseT-compatible devices. In contrast, AV over IP systems can integrate with any IP-enabled device, offering more flexibility for future expansion.
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Cost: HDBaseT equipment, though requiring no licensing fees, tends to be more expensive due to the Valens chips. AV over IP, while requiring licenses for HDMI products, can vary in cost depending on system requirements and components.
Conclusion
HDBaseT is a powerful technology for extending AV signals over long distances with uncompressed, high-quality video and audio, making it a versatile solution for various professional settings. Whether you're installing an AV system for a school, healthcare environment, or large event, understanding how HDBaseT works and when to use extenders, splitters, or matrix switches can help you make the right choice for your setup.
Recommended Reading
What Is HDBaseT? Standards & Comparisons with HDMI over IP
This content is used with permission from SC&T. All rights reserved.