Introduces a remote monitoring-measuring system used for environmental protection based upon PSTN (Public Switched Telephone Networks).
介绍了基于PSTN(公共程控交换电话网络)的环保远程监测系统。
The limited transmission rate available on the Public switched telephone network (PSTN) and on wireless networks presents a significant challenge to digital video communications.
这些应用对传输速率有限的公共交换电话网(PSTN网)和无线网络提出了重大挑战。
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