1、主设备故障有硬件故障软件故障动力故障传输故障更换载频时，注意戴上防静电环，防止静电危害人体健康人体上的静电影响载频板子载频驻波比告警出现的原因有：(1)、载频连线CS-03等连接线；(2)、载频；(3)、耦合器和合路器；(4)、天馈系统引起扩容后基站无法正常工作的原因：(1) 扩容载频坏；(2) 扩容载频槽位坏；(3) BTS背板坏；(4) BTS背板连接排线坏影响小区覆盖大小的主要因素有基站天线高度、天线下倾角、天线特性、基站发射功率、接收机灵敏度等在更换BCCH载频时不需要关闭TEL （错）1.RBS2206基站中，有4个G.703接口。

Y－LINK最大的速率是13MBIS/S。

2.RBS2206中，目前主要采用的CDU类型有CDU-G 和CDU-F3.一个RBS2206机架最多可支持 6 个dTRU。

4.爱立信2202设备四条总线本地总线 , 时钟总线 ,X总线， CDU bus线，5.DXU21 DCP 与时隙上的关系对应表。

A端口：1 至 31B端口：33 至 63C端口：287 至 317D端口：319 至 349CDU-C，C+所含的合成器为 HCOMB ，CDU-D所含的合成器为FCOMB ，CDU-C+既可接成A 型接法，又可接成C型接法，GSM900本架内从HLOUT连到HLIN时要加 3dB衰减头。

IDB版本C+9d-2.2中的C+表示CDU的类型为C+，9表示频率为900MHZ，d表示采用双工器，前面的2表示有2条天线，后面的2表示最多接2个载波。

我省采用爱立信宏蜂窝设备的型号主要为RBS2000系列的2202和 2206 ；2000系列机架连接方式有级连， TG同步和主附架。

6.基站时钟板告警有可能是软件版本和硬件版本不匹配造成。

(T)7.以下（ D ）项不是TRU的功能？A、功率放大B、信号处理C、VSWR监视D、发射信号合成8.RBS2000中有（）条LOCAL BUS？每条LOCAL BUS上最多携带（）个载波？A、1，6B、2，6C、4，4D、1，19.dTRU can handle how many users on one GSM Time Slot?BA) 1B) 2C) 6D) 1210.What is needed if you want to change RBS 2206 power system from AC to –48 volts?BA)Direct connection to IDMB) -48 volt PSU onlyC)DCCU and –48 V DC PSUD)DCCU and +24 V DC PSU11.The Main DC supply voltage in the RBS is__________.BA) - 24 VDCB) + 24 VDCC) - 48 VDCD) + 48 VDC12.From where to where Y-link is connected?DA)CDU-G to CDU-FB)CDU to CXUC)CDU to dTRUD)DXU front to dTRU backplane13.The dTRU performs which of the following?DA) Signal Modulation/Demodulation and Amplification.B) Burst formatting, ciphering, interleaving & speech coding.C) Cross connect timeslot information.D) Both A and B.14.What is the meaning of multidrop ? BA) A quick way of decreasing the temperature inside the cabinet.B) Casacading of PCM-links between RBS’s.C) A quick way of decreasing the outputpower of the TRU’s.D) All calls are dropped when you push the reset button on one of the TRU’s.15.The PSUs are responsible for_______________.CA) Controlling the usage of the backup batteriesB) Receiving the input AC main supply and distributing it throughout the cabinetC) Transforming and rectifying input AC power and providing dc input supplyto the IDMD) Supervising power management and controlling the charging of the backup batteries16.What is the idea of using a combiner?BA)Up to four sites can share one PCM linkB)Several TRXs can share one antenna systemC)The mobile can listen to two base stations at the same timeD)Only one base station is needed per siteE)Sending and transmitting can be performed from the same antenna17.The TRU handles how many timeslots per carrier?AA)8B) 3C)32D)1618.天线增益是如何获得的?BA)在天线系统中使用功率放大器B)使天线的辐射变得更集中C)使用高效率的天馈线D)使用低驻波比的设备19.It is possible to have mixed CDU’s in the cabinet. Which combinations areallowed?DA) CDU type A and CDU type C+B) CDU type A and CDU type CC) CDU type A and CDU type DD) Both A and B20.Which unit enables connection of multiple transmitters to the same antenna?AA) Combining and Distribution Unit (CDU)B) Power Supply Unit (PSU)C) Transceiver Unit (TRU)D) Distribution Switch Unit (DXU)21.The ACCU performs which of the following?BA) Supplies DC power to the batteries.B) Provides circuit breaker protection for the PSU’sC) Distributes power to the IDM’sD) Provides circuit breaker protection for all Main RU’s in the cabinet22.Which type of CDU is a narrowband combiner?DA) CDU-AB) CDU-CC) CDU-C+D) CDU-D23.Which of the following can the OMT perform?DA) Read the cabinets Installation DatabaseB) Reconfigure the cabinets Installation DatabaseC) Display faults in the RBSD) All of the above24.The PSUs are responsible for __________________CA) controlling the usage of the backup batteriesB) receiving the input AC main supply and distributing it throughout the cabinetC) transforming and rectifying input AC power and distributing itD) supervising power management and controlling the charging of the backup batteries25.During normal network operation the Base Station Timing ______________ and sentto other RBS units.BA) is generated in the ECU’s Central Timing UnitB) is synchronized in the DXU using T1 frame sync, or generated from TS 0 (E1).C) is generated in the #1 TRUD) is received via the Air interface1.RBS2000站温度过高超过门限值时，则 EXTERNAL ALARM 灯会亮。

2.RBS2000中 DXU 完成IS功能，其配置数据在 MO VIEW 中的 IS CONFIG 项目中查出。

3.在基站进行电路板拔插操作时必须戴防静电手环，主要是保护板子。

4.RBS2000中天线的VSWR的监视在TRU 中进行。

VSWR一级告警门限值设为 2.2 ，二级告警门限值设为 1.8 。

5.分集接收告警产生的条件为：基站的一个或若干个载频的2路接收信号A、B的强度相差至少为12dB(即≥12dB),并且持续50分钟以上，基站就会产生分集接收告警。

6.一个小区中，如果只有单个TRU的SSI值过高，大于12db，则很可能是这个TRU的故障，更换这个TRU。