浅谈通信网的现状与发展（下）蔡东二、信号系统信号系统是整个通信网的神经系统。只有高效可靠的信号系统，才能使网路作为一个整体而正常运行，有效地完成用户之间的通信。图１１是两用户通信接续建立过程的信号传送流程。用户线信号一般采用随路信号方式，局间信号可采... Talking about the status quo and development of communication network (next) Cai Dong Second, the signal system The signal system is the entire communication network of the nervous system. Only efficient and reliable signal system can make the network as a whole and normal operation, effectively completing the communication between users. Figure 11 is a two-user communication connection establishment process signal transmission process. Subscriber line signals generally use the way signals, inter-office signals can be taken ...