对于远程测试多媒体网络的需求进行了详尽的分析，提出了一种利用IP分组交换网建立虚拟专用网络的网络模型。
After a detailed analysis of multi-media network on remote satellite tests, a virtual special multi-media network model using IP exchange nets was proposed.
连接用户终端设备和公用交换网并具有一个电话交换设备专用端口的电话线数。
The number of telephone lines connecting the subscriber's terminal equipment to the public switched network and which have a dedicated port in the telephone exchange equipment.
电力系统自动交换网作为国内最大的专用语音通信网之一，发挥着巨大的作用。
Power system communication automatic exchange system is one of the largest dedicated phonetic communication network in China, which plays a tremendous role.
电力系统自动交换网作为国内最大的专用语音通信网之一，发挥着巨大的作用。
Power system communication automatic exchange system is one of the largest dedicated phonetic communication network in China, which plays a tremendous role.
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