# Table of contents

* [Introduction](README.md)
* [High Level Math](high-level-math/README.md)
  * [Function, limitation, and continuity](high-level-math/function-limitation-and-continuity-of-function/README.md)
    * [What is function?](high-level-math/function-limitation-and-continuity-of-function/what-is-function.md)
    * [Two kinds of infinity](high-level-math/function-limitation-and-continuity-of-function/two-kinds-of-infinity.md)
    * [The limitation of a function](high-level-math/function-limitation-and-continuity-of-function/the-limitation-of-a-function.md)
    * [A model for getting limitation](high-level-math/function-limitation-and-continuity-of-function/a-model-for-getting-limitation.md)
  * [Derivative and differential](high-level-math/derivative-and-differential/README.md)
    * [Formulas of derivative](high-level-math/derivative-and-differential/formulas-of-derivative.md)
    * [Use derivative formula](high-level-math/derivative-and-differential/use-derivative-formula.md)
    * [Goes deeper](high-level-math/derivative-and-differential/goes-deeper.md)
    * [Use derivative](high-level-math/derivative-and-differential/use-derivative/README.md)
      * [Function analyzing in theory](high-level-math/derivative-and-differential/use-derivative/function-analyzing-in-theory/README.md)
        * [First derivative](high-level-math/derivative-and-differential/use-derivative/function-analyzing-in-theory/first-derivative.md)
        * [Second derivative](high-level-math/derivative-and-differential/use-derivative/function-analyzing-in-theory/second-derivative.md)
        * [Domain and Extreme Value](high-level-math/derivative-and-differential/use-derivative/function-analyzing-in-theory/domain-and-extreme-value.md)
        * [Overall change](high-level-math/derivative-and-differential/use-derivative/function-analyzing-in-theory/overall-change.md)
      * [Derivative use in reality](high-level-math/derivative-and-differential/use-derivative/derivative-use-in-reality.md)
  * [Integration](high-level-math/integration/README.md)
    * [Indefinite integral](high-level-math/integration/indefinite-integral/README.md)
      * [Basic formulas](high-level-math/integration/indefinite-integral/basic-formulas.md)
      * [Use formula](high-level-math/integration/indefinite-integral/use-formula.md)
      * [Goes deeper](high-level-math/integration/indefinite-integral/goes-deeper.md)
      * [Integration by parts](high-level-math/integration/indefinite-integral/integration-by-parts.md)
    * [Definite integral](high-level-math/integration/definite-integral/README.md)
      * [Properties of definite integral](high-level-math/integration/definite-integral/properties-of-definite-integral.md)
      * [Second fundamental theorem of calculus](high-level-math/integration/definite-integral/second-fundamental-theorem-of-calculus.md)
      * [Multi-method for solving definite integral](high-level-math/integration/definite-integral/multi-method-for-solving-definite-integral.md)
  * [Multivariable calculus](high-level-math/multivariable-calculus/README.md)
    * [Limitation](high-level-math/multivariable-calculus/limitation.md)
    * [Partial derivatives](high-level-math/multivariable-calculus/partial-derivatives.md)
    * [Differential](high-level-math/multivariable-calculus/differential.md)
    * [Multiple integral](high-level-math/multivariable-calculus/multiple_integral.md)
  * [Series](high-level-math/series.md)
  * [Linear algebra](high-level-math/linear_algebra.md)
  * [GaoKao](high-level-math/gaokao/README.md)
    * [1](high-level-math/gaokao/1.md)
    * [The road for starting](high-level-math/gaokao/the-road-for-starting.md)
    * [Polar Coordinates](high-level-math/gaokao/polar-coordinates.md)
    * [Tangent Line](high-level-math/gaokao/tangent-line.md)
* [Electrical Engineering](electrical-engineering/README.md)
  * [The Terminologys](electrical-engineering/the-terminologys.md)
  * [DC](electrical-engineering/dc/README.md)
    * [The circuit rule](electrical-engineering/dc/the-circuit-rule.md)
    * [KCL and KVL](electrical-engineering/dc/kcl-and-kvl.md)
    * [Superposition](electrical-engineering/dc/superposition.md)
  * [AC](electrical-engineering/ac/README.md)
    * [Intuition](electrical-engineering/ac/intuition.md)
    * [Resistor](electrical-engineering/ac/resistor.md)
    * [Inductor](electrical-engineering/ac/inductor.md)
    * [Capacitor](electrical-engineering/ac/capacitor.md)
    * [AC circuit](electrical-engineering/ac/ac-circuit.md)
    * [三相电](electrical-engineering/ac/san-xiang-dian/README.md)
      * [星形联结](electrical-engineering/ac/san-xiang-dian/xing-xing-lian-jie.md)
      * [三角形联结](electrical-engineering/ac/san-xiang-dian/san-jiao-xing-lian-jie.md)
      * [实际电路](electrical-engineering/ac/san-xiang-dian/shi-ji-dian-lu.md)
  * [Voltage and Current Rule in Circuit](electrical-engineering/voltage-and-current-rule-in-circuit.md)
  * [Response](electrical-engineering/response/README.md)
    * [Foundations](electrical-engineering/response/foundations.md)
    * [零输入响应](electrical-engineering/response/ling-shu-ru-xiang-ying.md)
    * [零状态响应](electrical-engineering/response/ling-zhuang-tai-xiang-ying.md)
    * [一阶电路的全响应](electrical-engineering/response/yi-jie-dian-lu-de-quan-xiang-ying.md)
* [Analog Electronics](analog-electronics/README.md)
  * [Technical terms 1](analog-electronics/technical-terms-1.md)
  * [DC stable source circuit 的分析与应用](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/README.md)
    * [二极管的特性与应用](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/er-ji-guan-de-te-xing-yu-ying-yong/README.md)
      * [半导体](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/er-ji-guan-de-te-xing-yu-ying-yong/ban-dao-ti.md)
      * [PN junction](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/er-ji-guan-de-te-xing-yu-ying-yong/pn-junction.md)
      * [Diode](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/er-ji-guan-de-te-xing-yu-ying-yong/diode.md)
      * [测试二极管](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/er-ji-guan-de-te-xing-yu-ying-yong/ce-shi-er-ji-guan.md)
    * [整流滤波电路的分析与应用](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/zheng-liu-lv-bo-dian-lu-de-fen-xi-yu-ying-yong/README.md)
      * [Rectifier circuit](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/zheng-liu-lv-bo-dian-lu-de-fen-xi-yu-ying-yong/rectifier-circuit.md)
    * [直流稳压电路的分析](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/zhi-liu-wen-ya-dian-lu-de-fen-xi/README.md)
      * [Zener diode](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/zhi-liu-wen-ya-dian-lu-de-fen-xi/zener-diode.md)
      * [Shunt voltage regulators](analog-electronics/dc-stable-source-circuit-de-fen-xi-yu-ying-yong/zhi-liu-wen-ya-dian-lu-de-fen-xi/shunt-voltage-regulators.md)
  * [Thyristor](analog-electronics/thyristor.md)
  * [Technical terms 2](analog-electronics/technical_terms_2.md)
  * [Amplifying circuit](analog-electronics/amplifying-circuit/README.md)
    * [Bipolar Junction Transistor](analog-electronics/amplifying-circuit/bipolar-junction-transistor.md)
    * [Common Emitter Configuration](analog-electronics/amplifying-circuit/common_emitter_configuration.md)
    * [Biasing](analog-electronics/amplifying-circuit/biasing.md)
    * [Analysis](analog-electronics/amplifying-circuit/analysis.md)
    * [Mess](analog-electronics/amplifying-circuit/mess.md)
    * [Negative-feedback amplifier](analog-electronics/amplifying-circuit/negative-feedback_amplifier.md)
    * [Integrated Operational Amplifier](analog-electronics/amplifying-circuit/integrated_operational_amplifier.md)
  * [Algorithms](analog-electronics/algorithms/README.md)
    * [What's the ouput of a voltage rectifier circuit](analog-electronics/algorithms/whats_the_ouput_of_a_voltage_regulator_circuit.md)
    * [PNP or NPN](analog-electronics/algorithms/pnp_or_npn.md)
    * [Judging the state of a BJT](analog-electronics/algorithms/judging_the_state_of_a_bjt.md)
    * [What's common in BJT](analog-electronics/algorithms/whats_common_in_bjt.md)
    * [Does a amplifying circuit normal](analog-electronics/algorithms/does_a_amplifying_circuit_normal.md)
    * [What's the feedback type](analog-electronics/algorithms/whats_the_feedback_type.md)
    * [What kind of distortion you are encounter](analog-electronics/algorithms/what_kind_of_distortion_you_are_encounter.md)
* [Digital Electronic Technology](digital-electronic-technology/README.md)
  * [Logic Gate](digital-electronic-technology/logic-gate.md)
  * [Logic expressions](digital-electronic-technology/logic-expressions.md)
  * [Karnaugh map](digital-electronic-technology/karnaugh-map.md)
  * [Number system](digital-electronic-technology/number_system.md)
  * [Multiplexer](digital-electronic-technology/multiplexer.md)
  * [Flip-flop](digital-electronic-technology/flip-flop.md)
* [Principles of Communications](principles-of-communications/README.md)
  * [Overviews](principles-of-communications/overviews.md)
  * [PCM](principles-of-communications/pcm.md)
  * [HDB3](principles-of-communications/hdb3.md)
  * [Modulations](principles-of-communications/modulations.md)
  * [Cyclic code](principles-of-communications/cyclic_code.md)
* [Data Communications and Networking](data-communications-and-networking/README.md)
  * [Something about IPv4](data-communications-and-networking/something-about-ipv4.md)
* [Micro Control System 51 Series](micro-control-system-51-series/README.md)
  * [The Delay function](micro-control-system-51-series/delay-function.md)
  * [The Interrupt function](micro-control-system-51-series/the-interrupt-function.md)
* [Maintenance of Railway Optical Cable Lines](maintenance-of-railway-optical-cable-lines/README.md)
  * [Questions](maintenance-of-railway-optical-cable-lines/questions.md)
  * [Pictures](maintenance-of-railway-optical-cable-lines/pictures.md)
* [Mobile Communications](mobile-communications/README.md)
  * [Concepts](mobile-communications/concepts-about-mobile-communication.md)
  * [Coding and Modulation](mobile-communications/coding-and-modulation-of-mobile-communication.md)
  * [Key Technologies](mobile-communications/key-technologies-for-mobile-communications.md)
  * [Mobile communication network structure](mobile-communications/mobile-communication-network-structure.md)
  * [Radio wave Propagation and Interference](mobile-communications/radio-wave-propagation-and-interference.md)
  * [GSM](mobile-communications/gsm.md)
  * [CDMA](mobile-communications/cdma.md)
  * [GPRS](mobile-communications/gprs.md)
  * [3G](mobile-communications/3g.md)
  * [4G](mobile-communications/4g.md)
  * [Base Station Maintenance](mobile-communications/base-station-maintenance.md)
* [Multimedia Communication](multimedia-communication/README.md)
  * [Concept of Multimedia](multimedia-communication/concept-of-multimedia.md)
  * [Compression](multimedia-communication/compression.md)
  * [Lossless Compression](multimedia-communication/lossless-compression.md)
  * [Audio](multimedia-communication/audio.md)
  * [Lossy Audio Coding](multimedia-communication/lossy-audio-coding.md)
  * [Graph Compression](multimedia-communication/graph-compression.md)
  * [All for the exam](multimedia-communication/all-for-the-exam.md)
* [Power system for Communication Devices](power-system-for-communication-devices/README.md)
  * [Overview](power-system-for-communication-devices/overview.md)
  * [AC power Distribution Panel](power-system-for-communication-devices/ac-power-distribution-panel.md)
  * [UPS](power-system-for-communication-devices/ups.md)
  * [HF Switched-mode Power Supply](power-system-for-communication-devices/switched-mode-power-supply.md)
  * [Battery](power-system-for-communication-devices/battery.md)
  * [Earthing or Use Lightning Arrester](power-system-for-communication-devices/earthing-or-use-lightning-arrester.md)
  * [Power Supply Monitoring System](power-system-for-communication-devices/power-supply-monitoring-system.md)
  * [All for the exam](power-system-for-communication-devices/all-for-the-exam.md)
* [Optical fiber Communication system](optical-fiber-communication-system/README.md)
  * [What is Optical fiber Communication system](optical-fiber-communication-system/what-is-optical-fiber-communication-system/README.md)
    * [Prepare](optical-fiber-communication-system/what-is-optical-fiber-communication-system/optical-fiber.md)
    * [Something About Optical fiber](optical-fiber-communication-system/what-is-optical-fiber-communication-system/something-about-optical-fiber.md)
    * [Passive Optical Devices](optical-fiber-communication-system/what-is-optical-fiber-communication-system/passive-optical-devices.md)
    * [Active Optical Devices](optical-fiber-communication-system/what-is-optical-fiber-communication-system/active-optical-devices.md)
    * [Optical transmitter Test](optical-fiber-communication-system/what-is-optical-fiber-communication-system/optical-transmitter-test.md)
    * [Optical receiver Test](optical-fiber-communication-system/what-is-optical-fiber-communication-system/optical-receiver-test.md)
    * [Compose an Optical Communication System](optical-fiber-communication-system/what-is-optical-fiber-communication-system/compose-an-optical-communication-system.md)
  * [SDH \(Synchronous Digital Hierarchy\)](optical-fiber-communication-system/sdh-synchronous-digital-hierarchy/README.md)
    * [Frame Structure of SDH](optical-fiber-communication-system/sdh-synchronous-digital-hierarchy/frame-structure-of-sdh.md)
    * [SDH Equipments](optical-fiber-communication-system/sdh-synchronous-digital-hierarchy/hardware-of-sdh-system.md)
    * [Clock System](optical-fiber-communication-system/sdh-synchronous-digital-hierarchy/clock-system.md)
    * [ZXONM E300 Practice](optical-fiber-communication-system/sdh-synchronous-digital-hierarchy/zxonm-e300-practice.md)
    * [SDH protection](optical-fiber-communication-system/sdh-synchronous-digital-hierarchy/sdh-protection.md)
  * [WDM \(Wavelength-Division Multiplexing\)](optical-fiber-communication-system/wdm-wavelength-division-multiplexing.md)
  * [OTN \(Optical Transport Network\)](optical-fiber-communication-system/otn-optical-transport-network/README.md)
    * [OverHead of OTN](optical-fiber-communication-system/otn-optical-transport-network/overhead-of-otn.md)
    * [OTN Alarms & Errors](optical-fiber-communication-system/otn-optical-transport-network/otn-alarms-and-errors.md)
    * [Do it again, what's happened?](optical-fiber-communication-system/otn-optical-transport-network/do-it-again-whats-happened.md)
* [Communication Tech English](communication-tech-english/README.md)
  * [Fundamentals of Electricity](communication-tech-english/fundamentals-of-electricity.md)
  * [Digital Communications](communication-tech-english/digital-communications.md)
  * [Optical Communications](communication-tech-english/optical-communications.md)
* [High-speed railway Communication Technology](high-speed-railway-communication-technology/README.md)
  * [Overview](high-speed-railway-communication-technology/overview.md)
  * [Base Knowledge](high-speed-railway-communication-technology/base-knowledge.md)
  * [FH98](high-speed-railway-communication-technology/fh98.md)
  * [MDS3400](high-speed-railway-communication-technology/mds3400.md)
  * [Everything is for the exam](high-speed-railway-communication-technology/everything-is-for-the-exam.md)
* [GSM for Railway](gsm-for-railway/README.md)
  * [Overview](gsm-for-railway/overview.md)
  * [Wired Parts](gsm-for-railway/wired-parts.md)
  * [Digital dispatch Communication System](gsm-for-railway/digital-dispatch-communication-system.md)
  * [Basic Knowledge of GSM-R](gsm-for-railway/gsm-r.md)
  * [Key technologies for GSM-R](gsm-for-railway/key-technologies-for-gsm-r.md)
  * [Structure of GSM-R](gsm-for-railway/structure-of-gsm-r.md)
  * [GSM-R Network Mode](gsm-for-railway/gsm-r-network-mode.md)
  * [Wireless Channels for GSM-R](gsm-for-railway/wireless-channels-for-gsm-r.md)
  * [Mobility Management](gsm-for-railway/mobility-management.md)
  * [Connection Management](gsm-for-railway/connection-management.md)
  * [Security Management](gsm-for-railway/security-management.md)
  * [GPRS](gsm-for-railway/gprs.md)
  * [GSM-R/GPRS Wireless Access Platform](gsm-for-railway/gsm-rgprs-wireless-access-platform.md)
  * [GSM-R Features](gsm-for-railway/gsm-r-features.md)
  * [GSM-R Numbering Plan](gsm-for-railway/gsm-r-numbering-plan.md)
  * [ASCI](gsm-for-railway/asci.md)
* [Network Configuration Training](network-configuration-training/README.md)
  * [Words I have learned](network-configuration-training/words-i-have-learned.md)
* [Broadband Access Technology](broadband-access-technology/README.md)
  * [Using Copper Line](broadband-access-technology/using-copper-line.md)
  * [Using Optical Fiber](broadband-access-technology/using-optical-fiber.md)
  * [Wireless](broadband-access-technology/wireless.md)
  * [All for the test](broadband-access-technology/all-for-the-test.md)
* [CIR](cir/README.md)
  * [Basci Knowledge](cir/basci-knowledge.md)
  * [Testing Equipment](cir/testing-equipment.md)
  * [The Structure of CIR](cir/the-structure-of-cir.md)
  * [All for the exam](cir/all-for-the-exam.md)
* [LTE](lte.md)
* [Script for ChaoXing](script-for-chaoxing.md)
* [Transmission and access network](transmission-and-access-network.md)

