SDH:Synchronous Digital Hierarchy,同步数字系列PTN:Packet Transport Network,分组传送网,主要用于移动或数据业务的回传,属于传输网范畴,但与SDH相比是IP核心,更适合传数据业务,2M是通过电路仿真实现的; OTN:Optical Transport Network光传送网BTS:Base Transceiver Station,基站收发台。BSC:Base Station Controller 基站控制器BBU:Base Band Unite基带处理单元3G信源...