爱立信基站主设备介绍(doc 13页)

C) - 48 VDC

D) + 48 VDC

1.From where to where Y-link is connected?D

A)CDU-G to CDU-F

B)CDU to CXU

C)CDU to dTRU

D)DXU front to dTRU backplane

2.The dTRU performs which of the following?D

A) Signal Modulation/Demodulation and Amplification.

B) Burst formatting, ciphering, interleaving & speech coding.

C) Cross connect timeslot information.

D) Both A and B.

3.What is the meaning of multidrop ? B

A) 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.

4.The PSUs are responsible for_______________.C

A) Controlling the usage of the backup batteries

B) Receiving the input AC main supply and distributing it throughout the cabinet

C) Transforming and rectifying input AC

power and providing dc input supply to the IDM

D) Supervising power management and controlling the charging of the backup batteries

5.What is the idea of using a combiner?B

A)Up to four sites can share one PCM link

B)Several TRXs can share one antenna system

C)The mobile can listen to two base stations at the same time

D)Only one base station is needed per site

E)Sending and transmitting can be performed from the same antenna

6.The TRU handles how many timeslots per carrier?A

A)8

B) 3

C)32

D)16

7.天线增益是如何获得的?B

A)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

8.It is possible to have mixed CDU’s in the cabinet. Which combinations are allowed?D

A) CDU type A and CDU type C+

B) CDU type A and CDU type C

C) CDU type A and CDU type D

D) Both A and B

9.Which unit enables connection of multiple transmitters to the same antenna?A

A) Combining and Distribution Unit (CDU)

B) Power Supply Unit (PSU)

C) Transceiver Unit (TRU)

D) Distribution Switch Unit (DXU)

10.The ACCU performs which of the following?B

A) Supplies DC power to the batteries.

B) Provides circuit breaker protection for the PSU’s

C) Distributes power to the IDM’s

D) Provides circuit breaker protection for

all Main RU’s in the cabinet

11.Which type of CDU is a narrowband combiner?D

A) CDU-A

B) CDU-C

C) CDU-C+

D) CDU-D

12.Which of the following can the OMT perform?D

A) Read the cabinets Installation Database

B) Reconfigure the cabinets Installation Database

C) Display faults in the RBS

D) All of the above

13.The PSUs are responsible for __________________C

A) controlling the usage of the backup batteries

B) receiving the input AC main supply and