QUESTION: 25

The BBU5900 uses a modular design.
Which of the following subsystems constitute the BBU? (Choose All that Apply)

Main control subsystem
Transmission subsystem
Baseband subsystem
RF subsystem

Answer(s): A,B,C

Explanation:

Control subsystem: It is responsible for managing and controlling the overall operation of the BBU, it provides functions such as system initialization, software management, and alarm management. Transmission subsystem: It is responsible for the transmission of data between the baseband subsystem and the RF subsystem, it includes functions such as data encoding, modulation, and multiplexing.
Baseband subsystem: It performs the baseband processing for the BBU, it includes functions such as demodulation, decoding, and demultiplexing.

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QUESTION: 26

If the length of the CPRI optical fiber between a BBU and an RRU exceeds 150 m, you are advised to use a multimode fiber.

True
False

Answer(s): A

Explanation:

The Common Public Radio Interface (CPRI) is a standard that defines the interface between the BBU (baseband unit) and the RRU (remote radio unit) in a wireless base station. The BBU and the RRU are connected by an optical fiber cable, known as the CPRI optical fiber.

The CPRI optical fiber is used to transport the digital baseband signals between the BBU and the RRU. The distance between the BBU and the RRU can be up to several kilometers, but the standard CPRI specification only supports a maximum distance of 150m between the BBU and RRU using single-mode fiber. If the distance exceeds 150m, multimode fiber should be used to extend the distance between the BBU and the RRU.

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QUESTION: 27

What is the maximum MIMO mode supported by Huawei 5G indoor CPE?

4T8R
2T2R
2T4R
4T4R

Answer(s): D

Explanation:

https://info.support.huawei.com/info-finder/encyclopedia/en/MIMO.html

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QUESTION: 28

In NSA networking, which of the following commands can be used to check whether the Sl-U interface is normal?

DSP S1INTERFACE
DSP SCTPLNK
DSP IPPATH
DSP GTPUECHO

Answer(s): B

Explanation:

The Sl-U interface is a signaling interface between the 5G CN and the 5G RAN in NSA networking. It uses the SCTP (Stream Control Transmission Protocol) to transport the signaling messages between the 5G CN and the 5G RAN.
The DSP SCTPLNK command can be used to check the status of the SCTP links between the 5G CN and the 5G RAN, it can show the SCTP link status, local and peer IP address, local and peer port number, association status, and more.

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QUESTION: 25

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QUESTION: 26

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QUESTION: 27

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QUESTION: 28

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