CDMA的关键技术，呼叫接纳控制和软容量，功率控制等，是了解CDMA的基础资料-The key technologies CDMA, call admission control and soft capacity, power control and so on, to understand the basic data for CDMA

详细描述了td中的呼叫流程，对于编程有指导意义-A detailed descr iption of the td in the call flow for the programming of guiding significance

楼宇对讲系统原理与应用,主叫,分机呼叫等技术内容-Building intercom system theory and application, calling, calling and other technical content of extension