固定专用的端到端电路 the fixed dedicated end-to-end circuit
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端到端的虚电路是从源节点某一端口到目标节点的另一端口之间，由软件建立的传送分组的通道，它和传统虚电路的区别在于与端口有关。
The end-to-end virtual circuit is between a port from the source node to the other ports of the target node, it is the channel to send packet which is established by the software.
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