有源线缆
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内置信号放大电路的线缆，能够在更长距离上保持全速传输。
无源USB4线缆在40 Gbps速度下限制在约0.8米。有源线缆嵌入重定时器或中继器芯片来在2-5米距离上保持信号完整性。它们成本更高且具有方向性——主机端和设备端有标记。对于长距离Thunderbolt或HDMI 2.1传输必不可少。