信号完整性
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电信号在线缆中传输时的质量，影响速度和可靠性。
在更长距离上，信号会因衰减、串扰和电磁干扰而劣化。更高频率的信号（如40 Gbps USB4）更容易受到劣化影响，这就是为什么更快的标准通常需要更短或有源线缆。