单选题 ZXUN uMAC-Gn/Gp SGSN采用11U的ETCA机框，每个机框中可以插入（ ）个风扇插箱。 The ZXUN uMAC-Gn/Gp SGSN uses the 11U ETCA shelf. ( ) fan sub-racks can be installed on each shelf.

单选题 uMAC SGSN中，产生话单的模块类型是（ ）。 In the uMAC SGSN, the ( ) module type generates CDRs.

单选题 uMAC系统组网中，Gs口是和（ ）直接的接口。 In the uMAC system networking structure, the Gs interface is directly connected to the ( ).

单选题 xGW GGSN中，关于CU，说法不正确的是（ ）。 In the xGW GGSN, which of the following statements is wrong about the CU? ( )

单选题 xGW系统中，（ ）子系统对外提供统一接口，主要实现系统配置、性能采集、告警通知、信令跟踪以及各种本地维护工具功能。 In the xGW system, the ( ) subsystem provides a unified interface to the external, which achieves the following functions: system configuration, performance statistics collection, alarms and notifications, signaling trace and various local maintenance tools.

单选题 uMAC系统组网中，下面哪个接口组网时，两个物理接口建议工作主备方式？（ ） In the uMAC system, during networking of the ( ) interface, it is recommended to configure the two physical interfaces in active/standby working modes.

单选题 uMAC系统组网中，下面哪个接口组网时，外部交换机建议工作在二层？（ ） In the uMAC system, during networking of the ( ) interface, it is recommended to make the external switch work on layer-2.

单选题 xGW系统中，（ ）负责整个系统的负载均衡。 In the xGW system, ( ) is in charge of load balancing of the entire system.