switched virtual circuits svc
交换虚拟电路SVC
以上为机器翻译结果，长、整句建议使用 人工翻译 。
However, the concern is that voice traffic in frame environments built with permanent virtual circuits (PVC) will not be as cost-effective as frame nets built with switched virtual circuits (SVC).
但问题是，用永久虚拟电路(PVC)建立起来的帧环境中的话音通信的性能价格比不如用交换虚拟电路(SVC)建立起来的帧网络。
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