Programme-controlled digital switching system for teaching experiment
A switch and program-controlled technology, applied in teaching models, educational tools, instruments, etc., can solve problems such as inconvenient use, lack of teaching, high prices, etc., and achieve the effect of improving teaching quality and deepening understanding
Inactive Publication Date: 2004-04-14
TSINGHUA TONGFANG CO LTD
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Problems solved by technology
Commercial telephone switches on the market have powerful functions, high circuit integration, and meet relevant standards through network access certification, but they are accompanied by high prices. Experimenters cannot see the transmission and control relationship of various signals during the switching process, let alone Functions and processes exchanged by manual control
Therefore, for teaching, on the one hand, the use of commercial switches cannot give full play to their functional characteristics, and they are overqualified; on the other hand, experimenters cannot observe the actual process of switching, and cannot achieve the purpose of teaching.
Therefore, there is a need for a switch specially designed for teaching to solve the above problems. The control circuit of the user interface part of the switch used for teaching purposes on the market is directly connected to the central control and switching part, and many signal states need to be measured by instruments. The code is composed of many small and medium-sized devices, and the modification of the program in the microcontroller requires special equipment, so it is very inconvenient to use
Method used
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[0024] see figure 1 The program-controlled digital switchboard that is used for teaching experiments in the prior art includes a subscriber line interface part 1 and a central control and switching part 2 composed of two routing subscriber line interfaces, and the central control and switching part 2 includes a signal tone generating circuit 3, Switching network 4, dial detection circuit 5, logic decoding circuit 6 and microcontroller 7, described logic decoding circuit 6 outputs the control signal after decoding to signal tone generation circuit 5 and switching network 4, and described signal tone The generation circuit 3 transmits a signal to the switching network 4, and the switching network 4 transmits a signal to the dial detection circuit 5 under the control of the return information of the subscriber line interface part 1, and the microcontroller 7 transmits the signal to the dial detection circuit 5 according to the received dial detection circuit 5. The dialing detect...
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The invention displays each signal state visually, and modifies program in microcontroller directly. Offline manual control circuit controls mutual information transmission between subscriber line interface and subscriber line speech processing unit as well as transmits signal to display circuit of control signal status. The control signal of subscriber line interface is transferred to display circuit of off / on hook status as well as display and sound circuit of ringing condition. Dial-up detection circuit in central controlling and switching part transfers number value dialed to display circuit of dial number. Logic decoding circuit is CPLD logic decoding circuit possessing online programmable function, providing exchange of logic decoding information. The programmable selecting switch controls microcontroller to receive processing program, which is transferred through online programmable interface of voltage transfer circuit and online programmable downloading wire.
Description
technical field [0001] The invention relates to the technical field of communication teaching experiment instruments, in particular to a program-controlled digital exchange for teaching experiments. Background technique [0002] Program-controlled digital exchange is a telephone switching device based on stored program control and digital voice signal processing. It plays a central role in the telephone switching network of modern communication, and therefore it is an important professional course in university teaching. Commercial telephone switches on the market have powerful functions, high circuit integration, and meet relevant standards through network access certification, but they are accompanied by high prices. Experimenters cannot see the transmission and control relationship of various signals during the switching process, let alone By manually controlling the function and process of the exchange. Therefore, for teaching, on the one hand, the use of commercial sw...
Claims
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IPC IPC(8): G09B25/02
Inventor 杨春武冯一兵万韬
Owner TSINGHUA TONGFANG CO LTD