Nowadays,in our country every mobile communication operator possesses a wide network,such as core voice network, SDH&PDH,package exchange,SCP and etc.

• 目前我国各移动通信运营商大都拥有一个规模宏大的网络,如核心话务网、接入网、SDH和PDH传输网、分组交换网、智能网等多种电信网络。