DYXS-CK Program-controlled Switching System Training Platform

1. System Features

1. It integrates three switching networks: manual switching, space division switching, and time division switching, reproducing the development history of the switching network;
2. It simulates the architecture of the classic local switching system, and separates the central processor, register, voice circuit switching controller and other units, so that students can fully understand the composition of the program-controlled switching system;
3. It has perfect program-controlled switching system management functions and complete experimental guidance documents;

4. Use single-chip microcomputer to realize the generation of signaling and signal tone;
5. Each voice channel time slot can be configured at will, so that students can fully understand the concept of time division multiplexing and time slot exchange;
6. Local setting of parameters: extension number, call level, system time can be set;
7. Powerful system self-test function;
8. The external line interface can be connected to the local telephone network to realize all the functions of the user switch;
9. Caller identification function: The experimental box has the sending and receiving functions of caller identification, which helps students to understand the principle and working method of caller identification more clearly;
10. The background management software is fully functional, and it clearly shows the working methods of program-controlled switching principles, billing, relays, etc. in a graphical way;
11. Space division relay can make calls and conversations between any telephones between two program-controlled boxes;
12. Digital time division relay can make eight telephones between two program-controlled experimental boxes talk to each other at the same time without affecting each other;
II. System composition

The system hardware m*nly consists of the following parts:

1. Power input module: generates working power of various voltages required by the entire experimental box.

Input: AC220V±10%, Output: DC±12V±5%, +5V±5%.

2. User interface circuit: The four-way analog user interface used in this design;

3. External line interface: used to connect user switches and office switches;

4. Central Processing Unit: It is implemented by MSC-51 series single chip microcomputer, m*nly realizing the management of human-machine interface, serial port communication, parameter setting and system management functions;

5. Register: It is implemented by the MSC-51 series single-chip microcomputer, m*nly realizing signaling management, CID function, DTMF dialing channel selection, user/external line interface indication and other functions;

6. Voice circuit switching controller: The MSC-51 series of single-chip microcomputers are used to control the time division switching unit and the space division switching unit.

7. Chassis: Aluminum alloy material, green and environmentally friendly, beautiful and elegant. Dimensions: 420×300×100mm.

8. Virtual simulation system for electricity safety and electric shock first *d

The software uses a combination of two-dimensional and three-dimensional virtual images to teach students the safety and first *d methods of electricity use. The software has single-phase electric shock, two-phase electric shock, step electric shock, low-voltage electric shock first *d, high-voltage electric shock first *d, artificial respiration rescue method, hand-holding breathing rescue method, chest cardiac compression rescue method and other principle explanations and teaching. Single-phase electric shock is divided into m*ntenance of live disconnection, m*ntenance of socket electric shock, outdoor electric shock and other principle demonstrations. Low-voltage electric shock and high-voltage electric shock teaching m*nly expl*n and demonstrate to students how to rescue people in low-voltage electric shock or high-voltage electric shock. Artificial respiration rescue method, hand-holding breathing rescue method, chest cardiac compression rescue method are displayed using 3D virtual simulation technology. After rendering and polishing, the model looks the same as the real part and the picture is realistic. Through practical tr*ning, students can be educated on safe use of electricity in the tr*ning room, improve their safety awareness, learn some self-rescue methods, and take cert*n safety measures to protect themselves when they encounter danger, as well as be familiar with the causes of various electrical accidents and practical operational measures for handling electrical accidents, so as to reduce the occurrence of electrical accidents.

3. Experimental Project

1. User line interface circuit and two-wire/four-wire conversion experiment

2. PCM encoding and decoding experiment of program-controlled switching

3. Experiments on various signaling tones and ringing current signal generators

4. Dual-tone multi-frequency DTMF reception and analysis experiment

5. Operate the operator console artificial simulation system experiment

6. Switching Network Principle (Programmable) System Experiment

7. Relay interface simulation LAN communication system analysis experiment

8. Programming and debugging experiment of program-controlled switching principle

9. User on-hook and off-hook signal detection experiment

10. Signaling transmission exchange analysis experiment

11. Central Control (CPU) Unit Experiment

12. In-office exchange programming experiment

13. Digital relay switching programming experiment

14. Telephone number rewriting and analysis (programmable) experiment

15. Digital time slot exchange experiment

16. Air separation exchange experiment

17. A single experimental box realizes comprehensive experiments on program-controlled switching principles

18. Two experimental boxes realize branch switch communication experiment

19. Signal transmission telephone system time and billing (programmable) experiment

20. Experiment with making minor modifications to the CPU monitoring program

21. Experiments on some new service functions of program-controlled switching systems

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