When it comes to core network, we have to talk about the mobile communication network, the principle of mobile communication network, the process of development and evolution, otherwise, it is hard to understand the core network,

CodePudding user response:

Long ago, communication from the telegraph, then after the famous bell invented, the phone began to walk into a person's life, but at first the phone is not like now is so complicated, in simple terms, is to point to point communication, but later found a point-to-point communication needs of line too much, so have the concept of SPC exchange, that is, through the PBX switch control of telephone voice,