900/1800MHz TDMA Digital Cellular Mobile Telecommunication Network Technical Specification for General Packet Radio Service Switching Sub-system Equipment
900/1800MHz TDMA数字蜂窝移动通信网通用分组无线业务(GPRS)设备技术规范交换子系统900/1800MHz TDMA Digital Cellular Mobile Telecommunication Network Technical Specification for General Packet Radio Service Switching Sub-system Equipment