YYY-8643Program controlled exchange experimental box

sketch:
Program controlled exchange experimental boxA newly developed telecommunications switching experimental system that is both teaching oriented and closely related to reality, designed to adapt to new telecommunications technologies and services. The experimental system will design the switching network unit as a plug-in module for students to develop and implement switching functions in different ways (equipped with: air separation switching module, MT8980 time-division switching module, DSP time-division switching module, CPLD time-division switching module). The experimental system can not only complete the traditional exchange experiment box with only voice channel exchange, but also realize the experimental content of new telecommunications technologies such as data packet exchange, voice platform, and common signaling (SS7) analysis. The experimental system is equipped with a local telephone interface, and after connecting to the local telephone line, the experimental box can become a user small switch; Added a telecommunications business data output interface to facilitate students in developing and analyzing telecommunications business management on a PC; An optical fiber interface has been added, which enables network communication through optical fibers. The experimental system has strong secondary development capabilities. After being equipped with a development board, students can design their own telephone interfaces, switching networks, central processing units, and develop relevant software to implement the functions of small switches. The experimental box has a novel structure, reasonable layout, and stable performance, which can meet the experimental and development needs of students at multiple levels.
1、 Product images

2、 Product features:
1. Modular design, clear division of module functions.
2. The platform is divided into user module, signaling signal generation module, call connection recorder module, signaling display and control module, routing and switching control module, etc.
3. The signaling display is direct and clear, and can synchronously display the calling and called numbers, called status, successful connection, call time, etc. through LCD.
4. Closely combining teaching difficulties, the experiment of exchange methods starts from manual exchange, spatial separation exchange, and digital time-division exchange, helping students understand the principles of exchange and compare the characteristics and advantages and disadvantages of various exchange methods.
To deepen students' understanding of time-division multiplexing, in the time-division relay experiment, the experimental box can use a keyboard and LCD to configure the time slots of each channel through human-machine dialogue, and can use an oscilloscope to observe the allocation of time slots on the time-division relay line in real time.
6. In order to cultivate students' ability to use hardware chips, the experimental box opens up the "Routing Switching Control Module". Students can develop various switching software (without using the MS51 simulator, online debugging with the support of our software) based on their understanding of the principles and control timing of space division switching and time-division switching chips, to achieve the required routing switching. It is very helpful for students to understand the principles of exchange and cultivate their ability to use chips.
7. Equipped with a complete telephone call backend software, it can be used as a teaching demonstration for teachers to facilitate students' understanding of the principle of signal processing in telephone calls.
8. Equipped with complete signaling analysis and telephone connection statistics software, it helps students learn how to use practical switch analysis software.

3、 Technical indicators
1. Utilize programmable technology to generate various signaling signals and control timing sequences;
2. The experimental system will design the switching unit as a plug-in module, equipped with: air separation switching module, MT8980 time-division switching module, DSP time-division switching module, CPLD time-division switching module.
3. Each processor adopts the MCS-51 microcontroller that is easy for students to obtain, reducing the development threshold.
4. The user module adopts a powerful PBL 38710 surface mount chip with excellent functionality;
5. Observation of key measurement points:
(1) A regular 20MHz dual trace oscilloscope can clearly observe the process of digital time slot exchange for each channel of telephone;
(2) And it can rewrite the process of time slot splitting in real-time on site;
(3) Other exchange processes have measurement points for observation;
6. Display and control mode: Chinese character LCD display, membrane switch control;
7. Number of gates in the switch: 4 gates; One of the user interface modules can be plugged in and unplugged, and students can design their own interface hardware;
8. Digital relay communication mode: using digital time-division switching to achieve relay self ring connection communication;
9. Simulate relay communication method: Implement relay connection communication between two experimental boxes;
10. Digital relay mode: Communication between two experimental boxes can be achieved through fiber optic relay connection;
11. Three CPUs are used as the central processing unit, recorder, and voice switch controller respectively;
12. Directly connected to a computer allows for on-site programming;
13. The telephone adopts a crystal head interface;
14. Run program-controlled exchange operation software, which can rewrite programs on site;
15. AC power supply 220V/0.6A;
16. DC power supply 5V/4A+12V/1A -12V/0.5A -48V/1A;
4、 Experimental Catalog
*Chapter SB8643 System Module Experiment
Experiment 1 Composition and Structure of Exchange System
Experiment 2 SB8643 power module
Experiment 3: CPU Central System Processor
Experiment 4 User Interface Module (Calling and Receiving) Experiment
Experiment 5: State Setting of Program Controlled Switching
Experiment 6: Generation and Observation of Signaling Signals
Experiment 7 Dual Tone Multi Frequency (DTMF) Reception and Detection
Experiment 8 PCM CODEC Encoding and Decoding
Experiment 9: Call Processing and Line Signal Transmission Process
Experiment 10: Two/Four Line Transformation and Echo Return Loss Test
*Experiment 11 User Terminal Telephone Signal Level Adjustment
Chapter 2 Signaling Exchange and Information Exchange
Experiment 12: Artificial and Signal Exchange Experiment
Process and Analysis of Experiment 13 Air Separation Exchange (MT8816)
Process and Analysis of Time Division Switching (MT8980) in Experiment 14
Process and Analysis of Time Division Switching (CPLD) in Experiment 15
Process and Analysis of Time Division Switching (DSP) in Experiment 16
Experiment 17: Local Telephone Interface Experiment
Chapter 3 Relay Experiment
Experiment 18: Air Separation Relay Experiment
Experiment 19: Digital Time Division Relay Fiber Optic Communication Experiment
Chapter 4: Secondary Development Experiment
Experiment 20 MT8816 Air Separation Exchange Development and Online Debugging Experiment
Experiment 21 MT8980 Time Division Switching Development and Online Debugging Experiment
Experiment 22 DSP Time Division Switching Network Development Experiment
Experiment 23 Local Telephone Interface Development Experiment
Experiment 24 CPLD Time Division Switching Development Experiment
Experiment 25: Programming Experiment for CPLD Signal Sound Generation
Experiment 26: Programming Experiment for Telephone Call Connection of Recorder
Experiment 27: LCD Chinese Characters and Character Display Programming
Experiment 28: Scanning Input Programming of Thin Film Keyboard
Experiment 29: New Service Features and Programming Debugging
Chapter 5 Signal Splitting Experiment No. 7
Experiment 30: Correspondence between Signal System No. 7 and OSI Layer 7
Experiment 31: Signal Splitting during User Call Process
Experiment 34: Statistical Analysis of Telecommunications Services
Appendix
Appendix 1 Instruction Set for LCD Display Driver Module HD 44780
Appendix 2 Introduction to MT8980 Digital Switching Network Chip
5、 Instrument configuration

Attachment:
Instructions for Program Controlled YUY-8643 Teaching Software
This teaching software is connected to the YUY-8643 experimental box through a computer serial port, and can be used in conjunction with programmable experiments to visually demonstrate the current status in real time and prompt the measurement points of the current experimental steps. It can also perform statistical analysis on various states and data of the phone.
One Program control experiment status demonstration
1. Idle time

2. Calling off hook

3. Dialing

4. Ringing

5. Establish a connection after being called off the hook

6. Called to hang up

7. The caller hangs up

2、 Data statistics
It can calculate the current call time, total call time, calling call time, called call time, communication costs, number of connections, and number of calls for each phone call.