The path of the PVC is identified at each switch by an incoming virtual channel identifier/virtual path identifier (VCI/VPI) and an outgoing VCI/VPI.

• 每台交换机通过一个入埠的虚拟通道标识符/虚拟路径标识符（VCI/VPI）和一个出埠的VCI/VPI来确定PVC的路径。