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University Notes
  • Introduction
  • High Level Math
    • Function, limitation, and continuity
      • What is function?
      • Two kinds of infinity
      • The limitation of a function
      • A model for getting limitation
    • Derivative and differential
      • Formulas of derivative
      • Use derivative formula
      • Goes deeper
      • Use derivative
        • Function analyzing in theory
          • First derivative
          • Second derivative
          • Domain and Extreme Value
          • Overall change
        • Derivative use in reality
    • Integration
      • Indefinite integral
        • Basic formulas
        • Use formula
        • Goes deeper
        • Integration by parts
      • Definite integral
        • Properties of definite integral
        • Second fundamental theorem of calculus
        • Multi-method for solving definite integral
    • Multivariable calculus
      • Limitation
      • Partial derivatives
      • Differential
      • Multiple integral
    • Series
    • Linear algebra
    • GaoKao
      • 1
      • The road for starting
      • Polar Coordinates
      • Tangent Line
  • Electrical Engineering
    • The Terminologys
    • DC
      • The circuit rule
      • KCL and KVL
      • Superposition
    • AC
      • Intuition
      • Resistor
      • Inductor
      • Capacitor
      • AC circuit
      • 三相电
        • 星形联结
        • 三角形联结
        • 实际电路
    • Voltage and Current Rule in Circuit
    • Response
      • Foundations
      • 零输入响应
      • 零状态响应
      • 一阶电路的全响应
  • Analog Electronics
    • Technical terms 1
    • DC stable source circuit 的分析与应用
      • 二极管的特性与应用
        • 半导体
        • PN junction
        • Diode
        • 测试二极管
      • 整流滤波电路的分析与应用
        • Rectifier circuit
      • 直流稳压电路的分析
        • Zener diode
        • Shunt voltage regulators
    • Thyristor
    • Technical terms 2
    • Amplifying circuit
      • Bipolar Junction Transistor
      • Common Emitter Configuration
      • Biasing
      • Analysis
      • Mess
      • Negative-feedback amplifier
      • Integrated Operational Amplifier
    • Algorithms
      • What's the ouput of a voltage rectifier circuit
      • PNP or NPN
      • Judging the state of a BJT
      • What's common in BJT
      • Does a amplifying circuit normal
      • What's the feedback type
      • What kind of distortion you are encounter
  • Digital Electronic Technology
    • Logic Gate
    • Logic expressions
    • Karnaugh map
    • Number system
    • Multiplexer
    • Flip-flop
  • Principles of Communications
    • Overviews
    • PCM
    • HDB3
    • Modulations
    • Cyclic code
  • Data Communications and Networking
    • Something about IPv4
  • Micro Control System 51 Series
    • The Delay function
    • The Interrupt function
  • Maintenance of Railway Optical Cable Lines
    • Questions
    • Pictures
  • Mobile Communications
    • Concepts
    • Coding and Modulation
    • Key Technologies
    • Mobile communication network structure
    • Radio wave Propagation and Interference
    • GSM
    • CDMA
    • GPRS
    • 3G
    • 4G
    • Base Station Maintenance
  • Multimedia Communication
    • Concept of Multimedia
    • Compression
    • Lossless Compression
    • Audio
    • Lossy Audio Coding
    • Graph Compression
    • All for the exam
  • Power system for Communication Devices
    • Overview
    • AC power Distribution Panel
    • UPS
    • HF Switched-mode Power Supply
    • Battery
    • Earthing or Use Lightning Arrester
    • Power Supply Monitoring System
    • All for the exam
  • Optical fiber Communication system
    • What is Optical fiber Communication system
      • Prepare
      • Something About Optical fiber
      • Passive Optical Devices
      • Active Optical Devices
      • Optical transmitter Test
      • Optical receiver Test
      • Compose an Optical Communication System
    • SDH (Synchronous Digital Hierarchy)
      • Frame Structure of SDH
      • SDH Equipments
      • Clock System
      • ZXONM E300 Practice
      • SDH protection
    • WDM (Wavelength-Division Multiplexing)
    • OTN (Optical Transport Network)
      • OverHead of OTN
      • OTN Alarms & Errors
      • Do it again, what's happened?
  • Communication Tech English
    • Fundamentals of Electricity
    • Digital Communications
    • Optical Communications
  • High-speed railway Communication Technology
    • Overview
    • Base Knowledge
    • FH98
    • MDS3400
    • Everything is for the exam
  • GSM for Railway
    • Overview
    • Wired Parts
    • Digital dispatch Communication System
    • Basic Knowledge of GSM-R
    • Key technologies for GSM-R
    • Structure of GSM-R
    • GSM-R Network Mode
    • Wireless Channels for GSM-R
    • Mobility Management
    • Connection Management
    • Security Management
    • GPRS
    • GSM-R/GPRS Wireless Access Platform
    • GSM-R Features
    • GSM-R Numbering Plan
    • ASCI
  • Network Configuration Training
    • Words I have learned
  • Broadband Access Technology
    • Using Copper Line
    • Using Optical Fiber
    • Wireless
    • All for the test
  • CIR
    • Basci Knowledge
    • Testing Equipment
    • The Structure of CIR
    • All for the exam
  • LTE
  • Script for ChaoXing
  • Transmission and access network
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  • RBS2000基站硬件由哪几部分组成?
  • BSC的功能有哪些?
  • 表征天线的性能指标有哪些?
  • 防雷设施对接地电阻有何要求?
  • 怎样对BSC机房进行维护?
  • 怎样进行基站设备维护?

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  1. Mobile Communications

Base Station Maintenance

RBS2000基站硬件由哪几部分组成?

RBS2000: Radio Base Station 2000,一种基站的型号

  • 分配交换单元(Distribution Switch Unit, DXU): 中央控制器,连接BTS(Base Transceiver Station)与BSC(Base Station Controller)

  • 无线收发单元(Transceiver Unit, TRU): 负责接收和发送,就一个部件

  • 合成与分配单元(Combining and Distributing Unit, CDU): 多个天线收发单元(TRU)连接到一个它(CDU)

  • 能源环境控制单元(Energy Control Unit, ECU): 监控电源设备

  • 电源侍服单元(Power Supply Unit, PSU): 叫电源供给单元更合适

  • 总线系统: 连接各个设备的线

BSC的功能有哪些?

  • 对基站进行监控

  • 无线电资源的管理与分配

一个BSC(Base Station Controller)通常控制多个BTS(Base Transceiver Station)

表征天线的性能指标有哪些?

我也不知道什么是表征天线,大概是带有特点的天线吧,或者一些参数用于区分不同类型的天线

  • 天线的增益: 衡量天线朝某一个特点方向收发信号的能力

  • 天线的方向

  • 半功率的宽度: : 大概是给你画一张图来展示信号发射的反向,图由三个“花瓣”组成,中间的那个花瓣被称为“主瓣”,它越窄,方向性越好(越是朝一个方向精确发射)

  • 工作频率

  • 输入阻抗

  • 驻波比

  • 前后比

  • 天线倾角

  • 分集接收

这些参数一般不重要,因为都有成套的设备与标准,按照标准直接买就好了

防雷设施对接地电阻有何要求?

电阻越小越好

接地电阻<=5Ω接地电阻 <= 5 \Omega接地电阻<=5Ω

怎样对BSC机房进行维护?

  1. 24小时监控网络运行状况和设备完好情况,做好异常检查

  2. 当设备故障,要全力检修,并报告上级

  3. 建立设备档案,收集设备资料与历史维修事件

  4. 安排月维护计划

  5. 保证机房环境稳定(湿度、温度、无尘)

  6. 严禁无关人员进入

怎样进行基站设备维护?

  1. 了解各个基站

  2. 保证电缆等线路畅通

  3. 当设备故障,要全力检修,并报告上级

  4. 建立设备档案,收集设备资料与历史维修事件

  5. 安排月维护计划

  6. 保证机房环境稳定(湿度、温度、无尘)

  7. 严禁无关人员进入

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