协议隧道
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在另一个协议的连接内传输一个协议的数据。
USB4和Thunderbolt通过单根USB-C电缆隧道传输多个协议：USB数据、DisplayPort视频和PCIe存储都共享同一个物理连接。主机控制器根据需求在隧道协议之间动态分配带宽。