3G网络结构拓扑图，其中包含CS域、PS域中各个网元，而且在每个接口上都有协议栈示意图，值得一看-3G network topology, which contains the CS domain, PS domain, the various network elements, and each interface has a protocol stack diagram, worth a visit

有间网吧设计方案，网吧布置，监控以及线路布置。拓扑图以及运行方案-There are Internet cafes design, cafe layout, monitoring, and line layout. Topology and run programs