用于 HDMI 扩展的半导体解决方案
Semtech’s AVXT chipset is uniquely designed to transmit AV content, up to 4KP60 4:4:4 (HDMI 2.0b), over both copper category cabling and optical fiber. By leveraging the same technology used for 10G Ethernet, AVXT enables transmission up to 100m using Cat-6a unshielded twisted pair (UTP) cable, or tens of kilometers using optical fiber. AVXT-based devices simultaneously transmit uncompressed-quality 4K video, multi-channel audio, Gigabit Ethernet, USB, and other control signals, offering unprecedented levels of performance for standalone point-to-point AV extenders. As shown in the diagram, the low cost AVX100 AV Extender can be used to extend HDMI over 100m of Cat-6a standard copper category cabling, with imperceptible end-to-end latency performance. Combined with fully integrated USB-HID, the AVX100 can also extend USB devices such as a keyboard and mouse, allowing PCs to be placed in remote, secure locations, while allowing the user more desk space and a quieter environment.
Figure 1. AVX100 AV Extender can be used for HDMI distribution and extension over 100m of Cat-6a standard copper category cabling, including extending USB devices such as keyboard and mouse, when combined with fully integrated USB-HID.
The AVXT ASIC is a perfect replacement for existing AV extension technologies with a new generation of fiber-based products for true long reach performance at cost points lower than existing copper-based solutions. Unique to the AVX200T Transceiver, the chip supports true bidirectional HDMI connectivity, providing simultaneous transmission of AV signals in both directions over a single fiber pair. These features enable manufacturers to develop a new class of point-to-point AV extension products which can dramatically reduce both material costs and the cost of installation. The AVX200T integrates a broadcast quality scaler which can be used to convert the image format at the transmit or receive end. Using an AVX100-based transmitter paired with an AVX200T-based receiver, the output resolution can be fixed to that of the connected display resolution regardless of the original source format. The scaler can also be used to crop and scale images for video wall applications, saving the significant additional costs associated with dedicated video wall processors.
图 2. AVX200T 收发器独特地支持真正的双向 HDMI 连接，可通过单光纤对实现双向视听信号的同时传输。
Compatibility with AVP
Both of Semtech’s ProAV platforms, AVXT and BlueRiver® AVP, use standard 10 Gigabit (10G) Ethernet connectivity and IP protocol to extend HDMI video up to 4K, multichannel digital audio and control interfaces, such as USB and RS-232, over 100m of copper category cabling, or many hundreds of meters over optical fiber. The key difference is that AVXT devices provide point-to-point 10G connectivity, while AVP powered products permit flexible IP networking capability using standard 10G Ethernet switches. As shown in the above video conferencing example setup, it’s possible to connect any AVXT endpoint directly to any AVP endpoint and AV traffic will flow from end to end, fully plug-and-play. And with transceiver-enabled endpoints, HDMI traffic will flow in both directions simultaneously, without limitation. As more and more manufacturers provide native SDVoE connectivity on their products, interoperability with AVXT ensures that this interface can be used even when simple, single source point-to-point connectivity is all that is required. For example, the same cable infrastructure can be used for an SDVoE-enabled ceiling mounted projector, whether it is used standalone with a local AVXT extended source, or connected to a network for SDVoE AV-over-IP connectivity.
Figure 3. Semtech’s ProAV platforms – AVXT and BlueRiver AVP – are fully compatible. In this video conferencing example, any AVXT endpoint can connect directly to any AVP endpoint, with AV traffic flowing from end-to-end, fully plug and play.
AVX200 内部：真正的双向 HDMI 解决方案
使用 Semtech 强大的 AVX200T 视听扩展器，只需少量组件即可实现真正的双向 HDMI 扩展器解决方案。通过启用 AVX200T 的视听处理引擎，可以配置 HDMI 输出以匹配所连显示器的最佳分辨率，因此无论源的图像格式如何，显示器都可以提供最佳视觉体验。
图 4.在此铜缆示例中，基于 AVX200T 的视听处理引擎，可以配置 HDMI 输出以匹配所连显示器的最佳分辨率。
将 AVX200T 搭配标准 SFP+ 光纤模块，可以实现经济高效的 HDMI 扩展器，其电缆覆盖性能远高于任何现有的铜缆扩展器解决方案。再加上完全支持同步 HDMI 输入和输出，也可以减少安装中所需要的扩展器数量，从而节省系统成本。
Figure 5. When paired with a standard SFP+ optical fiber module, AVX200T enables far greater reach performance than any existing copper-based solutions.
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