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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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  • 组成
  • 1. GPRS接口 服务器 (GRIS, GPRS Interface Server)
  • 2. 归属GPRS接口 服务器 (GROS, GPRS Home Server)
  • 3. RADIUS 服务器 (Remote Authentication Dial In User Service)
  • 4. DNS 服务器 (Domain Name Server)

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  1. GSM for Railway

GSM-R/GPRS Wireless Access Platform

铁路上数据交换有两种方式: 电路交换(CSD, Circuit Switched Data)、分组交换(GPRS, General Packet Radio Services)

讲真的，它们挺SB的，直接说 packaging switching 多好啊

除了列车控制信息用 CSD, 其他信息传输都用GPRS

组成

1. GPRS接口 服务器 (GRIS, GPRS Interface Server)

提供GPRS网络接入、协议转换、数据存储转发、信息安全功能

这个服务器有自己的IP地址

2. 归属GPRS接口 服务器 (GROS, GPRS Home Server)

提供数据存储功能: 存储全国铁路所有的GSM-R小区信息、铁路公里标、它们的GPS信息、每个路局占用的地理范围，能提供每个地理位置所对应的GPRS接口服务器的IP地址。

提供数据查询与检索功能: 废话嘛，存了不就得拿来用

3. RADIUS 服务器 (Remote Authentication Dial In User Service)

A RADIUS Server is a network server that other network devices contact in order to authenticate user information.

鉴权

4. DNS 服务器 (Domain Name Server)

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Last updated 5 years ago

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