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简述ITBBU需要安装哪些单板，并说明各自的功能。
在Option3X基站安装中，前传链路和回传链路分别指什么?请说明各自的连接对象和使用的线缆类型。
在Option3X数据配置中，为什么要给MME、SGW等网元配置环回地址（/32）?
请简述MCC和MNC的作用，并说明它们是如何组合成PLMN的。
为什么美国拥有多个MCC，而中国只有460一个?
在Option3X核心网数据配置中，MME需要配置哪些对接参数?
为什么在TDD 2.5ms单周期帧结构中，SRS的时隙偏移通常设为4?
画一张 5G 网络总体架构的示意图，标注清楚接入网、核心网、各个网元和接口。

画一张 5G 基站和 5G 核心网的组成架构图，标注清楚每个单元 / 网元的名称、核心接口。

5G 的三大应用场景分别是什么？
请说明MME、SGW、PGW在4G核心网中的主要功能。
什么是默认路由?它通常在什么情况下使用?
请对比SPN和OTN两种技术的主要特点和适用场景。

请简述5G核心网服务化架构（SBA）的优势。

简述 5G 非独立组网（NSA）与独立组网（SA）的主要区别。
简述在Option3X基站数据配置中，为什么4G和5G的TAC必须相同?
解释波分复用的基本原理，并说明其相对于单波长传输的优势。
图示（图2：OTN发送方向与接收方向内部连接示意图）：

【发送方向】                                 【接收方向】


客户设备1 ──▶ OTU1(λ1) ──┐                   客户设备1 ◀── OTU1(λ1) ◀─┐

客户设备2 ──▶ OTU2(λ2) ──┼──▶ OMU ──▶ OBA ──▶ 光纤 ──▶ OPA ──▶ ODU ──┤

客户设备3 ──▶ OTU3(λ3) ──┘                          (分波)            │

                                                                        │

                                                                  (各波长分离)

                                                                λ1, λ2, λ3

<ol style=margin: 16px 0px; padding-left: 18px; color: rgb(15, 17, 21); font-family: quote-cjk-patch, Inter, system-ui, -apple-system, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Open Sans&quot;, &quot;Helvetica Neue&quot;, sans-serif; font-size: 16px; white-space: normal; background-color: rgb(255, 255, 255); class= list-paddingleft-2> <li>

图中OTU的主要作用是什么？为什么每个OTU要发出不同波长的光（λ1、λ2、λ3）？

</li> <li>

OMU和ODU分别完成什么功能？它们之间为什么要通过OBA和OPA？

</li> <li>

如果OBA（光功率放大器）损坏，可能会导致什么后果？

</li> <li>

在IUV仿真软件中，要验证OTN内部光路是否正常，通常使用什么工具或方法？

</li> </ol>

图示（图3：Option3X承载网全网连接简化图）：

&nbsp; &nbsp; 核心网机房&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 承载中心机房&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;B站点机房

┌─────────────────┐&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ┌─────────────────┐&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ┌─────────────────┐

│&nbsp; &nbsp; &nbsp; MME&nbsp; &nbsp; &nbsp; &nbsp; │──┐&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; │&nbsp; &nbsp; &nbsp; BBU&nbsp; &nbsp; &nbsp; &nbsp; │

│&nbsp; &nbsp;1.1.1.1/32&nbsp; &nbsp; │&nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp;┌─────┐&nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; │ (4G主站)&nbsp; &nbsp; &nbsp; &nbsp; │

└─────────────────┘&nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp;│ODF&nbsp; │&nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; │ 10.10.10.1/24&nbsp; &nbsp;│

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; S1-MME&nbsp; &nbsp; &nbsp; &nbsp; │&nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; └────────┬────────┘

┌─────────────────┐&nbsp; │&nbsp; &nbsp;(控制面)&nbsp; &nbsp; &nbsp; │&nbsp; &nbsp; &nbsp;└──┬──┘&nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│

│&nbsp; &nbsp; &nbsp; SGW&nbsp; &nbsp; &nbsp; &nbsp; │──┼──────────────┐&nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│ 光纤

│&nbsp; &nbsp;3.3.3.1/32&nbsp; &nbsp; │&nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; │&nbsp; │&nbsp; &nbsp;┌────┴────┐&nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│ (前传)

└─────────────────┘&nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; │&nbsp; │&nbsp; &nbsp;│&nbsp; OTN&nbsp; &nbsp; │&nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; S1-U&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; │&nbsp; &nbsp;│ 设备&nbsp; &nbsp; │&nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ┌────┴────┐

┌─────────────────┐&nbsp; │&nbsp; (用户面)&nbsp; &nbsp; &nbsp; │&nbsp; │&nbsp; &nbsp;└────┬────┘&nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; │&nbsp; ITBBU&nbsp; │

│&nbsp; &nbsp; &nbsp; PGW&nbsp; &nbsp; &nbsp; &nbsp; │──┘&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; │&nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; │(CU+DU)&nbsp; │

│&nbsp; &nbsp;4.4.4.5/32&nbsp; &nbsp; │&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; │&nbsp; &nbsp;┌────┴────┐&nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; │ 40.40.40.40/32

└─────────────────┘&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; │&nbsp; &nbsp;│&nbsp; SPN&nbsp; &nbsp; │&nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; └─────────┘

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; │&nbsp; &nbsp;│ 设备&nbsp; &nbsp; │&nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; │&nbsp; &nbsp;└────┬────┘&nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│ 光纤

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; └────────┼────────┘&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│ (回传)

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; │

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;└───────────┼────────────────────────────────────┘

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;│

&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; (承载网传输链路)

题目：

<ol style=margin: 16px 0px; padding-left: 18px; color: rgb(15, 17, 21); font-family: quote-cjk-patch, Inter, system-ui, -apple-system, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto, Oxygen, Ubuntu, Cantarell, &quot;Open Sans&quot;, &quot;Helvetica Neue&quot;, sans-serif; font-size: 16px; white-space: normal; background-color: rgb(255, 255, 255); class= list-paddingleft-2> <li>

图中，核心网侧的MME和SGW分别通过什么接口与承载网相连？这些接口对应的信令或数据是什么？

</li> <li style=>

BBU（4G主站）和ITBBU（5G合设）分别通过什么设备连接到承载网？它们使用的物理线路通常是什么？

</li> <li style=>

如果ITBBU与SPN之间的光纤中断，会对5G业务产生什么影响？为什么？

</li> <li style=>

要测试B站点机房的BBU与核心网SGW之间的连通性，应使用什么命令？请写出一个可能的命令示例（假设BBU的IP为10.10.10.1，SGW的IP为3.3.3.1）。

</li> </ol>

请你结合所学知识，以四水市、建安市、兴城市的5G网络规划为例，论述在实际的5G网络规划中，如何根据不同的区域特点和业务需求，选择合适的拓扑结构和传输设备（如SPN、OTN）。请从接入层、汇聚层、核心层的角度进行分析，并说明这样规划的好处。

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