An integrated digital network in which the same time division switches and digital transmission paths are used to establish connections for different services
4.
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
मोबाइल