Firstly , the task , structure , technology and function of the existing dispatch system were introduced , whose key technology is based on the tdm and time division switch like pstn . further , the developing direction of pstn is based on ip , the pocked switch system and network , and also the dispatch system of the manned space flight launch base will transmit multimedia information on ip 首先，介绍了现有调度系统的任务、结构、技术和功能，可以看出，其技术核心是时分多路复用和时分交换技术，现在公用交换电话网( pstn )正向基于ip的包交换系统和网络发展，载人航天发射场调度系统也将利用ip网络技术传输多媒体指挥信息。
