向下兼容
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新标准与旧设备协作的能力，通常以旧设备的速度运行。
USB4接口接受USB 3.x和USB 2.0设备。HDMI 2.1电视与HDMI 1.4线缆兼容（以1.4速度运行）。向下兼容是线缆标准的核心原则，确保升级时旧设备仍能正常工作。