YUY-1121Modern Exchange Technology Experiment Box

Product Features
1. Modular design, based on the user switch model, with clear functional division and rich open interfaces.
Provide four telephone user interfaces, with two designed as pluggable modules.
It integrates three switching methods: manual switching, air separation switching, and time-division switching, all designed as pluggable modules.
Provides household signaling such as dial tone, busy tone, ring back tone, null tone, congestion tone, long-distance notification tone, and incoming call waiting tone, with a standard 450Hz sine wave signal;
Provides a standard 25Hz sine wave bell current signal.
Provides synchronous bit display of decoding data for DTMF dual tone multi frequency signals, which is intuitive and clear.
Provided with manual ringing device, operator voice interface, user line terminal, etc., it can truly and completely realize the process of manual exchange and connection, assist experimental personnel in understanding the essence of exchange, and stimulate learning interest.
In digital switching networks, various methods such as keyboard input and manual connection can be used to allocate and adjust the transmission and reception time slots of each telephone user, assisting experimental personnel in understanding the concept of time division.
Provided a standard E1 interface, which fully implements the processes of multiplexing and demultiplexing, framing, adding signaling, HDB3/AMI line encoding and decoding, bit synchronization, frame synchronization, etc. It can complete inter office communication between experimental boxes and also connect to third-party E1 interface devices. The E1 electrical signal is a Q9 coaxial cable standard interface with a 75/120 ohm impedance.
10. The call connection process is intuitive and clear, and call connection information can be synchronously displayed through a random LCD screen. It supports synchronous display of four call connection screens.
Provide external/local call interface plug-in modules that can be connected to the local call network.
Provide USB interface.
Provided a voice recording and playback circuit module.
Covering the experimental circuit board with an organic glass cover can effectively protect the exposed circuit.
The input keyboard provides six keys: up/down,+/-, back, confirm, etc., for easy menu selection and numerical modification.
Scalable VOIP softswitch mode, providing management functions, configurable mid-range numbers, supporting multiple services; Real time display of call process and detailed protocol data; Can provide protocol customization function and write SIP protocol by oneself; Can connect to telecom operators through servers and make external phone calls directly;
3、 Experimental content
Equipment Description for Experimental Requirements
*Chapter System Module Unit Experiment
Experimental 1 Equipment Composition and Test Point Description
Experiment 2 Telephone User Interface Module Experiment
Experiment 3: Generation and Observation of Telephone User Signaling
Experiment 4: Dual Tone Multi Frequency (DTMF) Reception and Detection Experiment
Experiment 5: Platform Exchange Method and Status Display
Experiment 6: PCM Encoding and Decoding Experiment for User Voice Channels
Experiment 7: Call Processing and Line Signal Transmission Process Experiment
Experiment 8: Two/Four Line Transformation and Echo Return Loss Test Experiment
Experiment 9: User Terminal Telephone Signal Level Adjustment Experiment
Chapter 2 Signaling Exchange and Information Exchange
Experiment 10: Manual Exchange Experiment
Experiment 11: Air Separation Exchange (MT8816) Experiment
Experiment 12 Time Division Switching (MT8980) Same Stream Time Slot Switching Experiment
Experiment 13 Time Division Switching (MT8980) Experiment on Time Slot Switching of Different bitstreams
Experiment 14 Time Division Switching (MT8980) Manual Connection Experiment
Experiment 15: Digital Time Division Relay Inter Office Communication Experiment
Experiment 16 Simulated Relay Communication Experiment
Appendix
Appendix 1: SDL Process Diagram for Internal Calls
Appendix 2 Introduction to MT8816 Analog Switching Network Chip
Appendix 3 Introduction to MT8980 Digital Switching Network Chip
Appendix 4 References
configuration