20世纪 90年代以来，我国电信业进入高速发展时期。 1999年与 1990年相比，电信业务总收入增长 37倍多，年均递增速度为 50％；电话装机量 (含移动电话 )增长 13倍多，年均递增速度为 34％。我国只用了 10年时间就完成了电话交换机从步进制到程控交换的更新换代，相当于西方 Since the 1990s, China’s telecom industry has entered a period of rapid development. Compared with 1990, the total revenue of telecommunications business increased by 37 times in 1999 with an average annual growth rate of 50%. The installed capacity of mobile phones (including mobile phones) increased more than 13 times with an average annual growth rate of 34%. Our country only took 10 years to complete the exchange of telephone switches from the step-by-step exchange of program-controlled exchange, the equivalent of the West