虚拟专用网vpn是依托ISP或NSP，构建在公共网络上的，虚拟、私人专用数据通信网络。
Virtual private network (VPN), based on ISP or NSP, is a virtual and private data communication network set up in the public network.
虚拟专用网vpn是一个新的网络热门技术，它可以利用公共网络建立企业内部网，从而不仅减轻了企业费用，还保证了数据的安全性。
The Virtual Private network (VPN) is a new network technology, which can use public network to construct Intranet. It not only reduce the expense of industry, but also ensure data security.
本文介绍了一种通过嵌入式调制解调器与公共电话网实现心电数据远程传输的系统，系统由家庭单元、公共电话网和中心工作站组成。
A new ECG teletransmission system based on embedded modem and public switched telephone network (PSTN) is presented, which consists of family unit, PSTN and center workstation.
从市场情况来看，电信业的竞争正在加剧，PSTN（公共交换电话网络）、CATV（有线电视网）、ATM和IP（数据网）都在相互窥视对方的传统市场。
According to the circumstances of the market, the competition of the telecom vocation is intensifying, the operators of PSTN, CATV, ATM and IP networks are peeking at others traditional markets.
从市场情况来看，电信业的竞争正在加剧，PSTN（公共交换电话网络）、CATV（有线电视网）、ATM和IP（数据网）都在相互窥视对方的传统市场。
According to the circumstances of the market, the competition of the telecom vocation is intensifying, the operators of PSTN, CATV, ATM and IP networks are peeking at others traditional markets.
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