程控交换/数字信号处理，教程。非常详细了介绍了程控交换的原理-Program-controlled exchange/digital signal processing, tutorial. A very detailed introduction of the principle of program-controlled exchange

程控交换与宽带交换课件，帮助大家学习，共同进步，希望大家也把课件上传，大家交流学习-Program-controlled switching and broadband exchange of courseware to help everyone learn, common progress, I hope everyone also courseware upload, U.S. to exchange learning

程控交换与宽带交换课件，帮助大家学习，共同进步，希望大家也把课件上传，大家交流学习-Program-controlled switching and broadband exchange of courseware to help everyone learn, common progress, I hope everyone also courseware upload, U.S. to exchange learning

程控交换与宽带交换课件，帮助大家学习，共同进步，希望大家也把课件上传，大家交流学习-Program-controlled switching and broadband exchange of courseware to help the U.S. study, and common progress, I hope everyone also courseware upload, communicate U.S. study