Since this kind of technology appeared , people have paid close attention to it all the time . among the technology , remote data acquiring technology based on pstn , with the characteristics of flexibility and practicality ^ favoured by many developers and widely used in the fields of remote - checking - meter , ttm and remote - monitoring etc . this thesis has put forward a practical scheme for remote data acquiring system based on pstn 这种技术自出现以来，就一直为人们所关注。在远程数据采集技术中，基于公众电话网的远程数据采集技术以其灵活、实用的特点为广大开发人员所青睐，被广泛应用于远程自动抄表、心电电话监护和远程监测等领域。本文提出了一种实用的基于公众电话网的远程数据采集系统的方案。
The communication technology of electric automatic system is discussed . it principally studies the technology of organizing nets , the communication technology of low pressure electric line and the technology of spread spectrum communication . it gives the project that power line carrier and direct sequence spread spectrum communication are combined with automatic dial - up passing modems for daqing automatic reading meter system 探讨了电力自动抄表系统的通信技术，重点研究了组网技术，低压电力线通信技术，扩频通信技术，提出了在大庆电力自动抄表系统中利用公众电话网通过调制解调器自动拨号、电力载波和无线直接序列扩频通信相结合的数据传输方案。
The core component of data acquiring terminal on the spot is dsp . dsp can not only complete the task of monitoring and management , but also expand the function of the system in digital filtering and data compressing . the system uses embedded modem chip with low price to modulated the data which are transmitted on the pstn 现场数据采集及发送系统的核心是dsp 。 dsp不但可以完成对现场系统的监控管理，还可以进一步扩展系统数字滤波、数据压缩等方面的功能。系统选用低价格的嵌入式modem芯片完成数据在公众电话网上的调制传输。
