CN201035822Y - Program controlled switch experiment system - Google Patents
Program controlled switch experiment system Download PDFInfo
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- CN201035822Y CN201035822Y CNU2007200368860U CN200720036886U CN201035822Y CN 201035822 Y CN201035822 Y CN 201035822Y CN U2007200368860 U CNU2007200368860 U CN U2007200368860U CN 200720036886 U CN200720036886 U CN 200720036886U CN 201035822 Y CN201035822 Y CN 201035822Y
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Abstract
The utility model discloses a program controlled switching experiment system, and relates to program controlled switching teaching experiment equipment. The system is mainly suitable for experiments or researches of university students or teachers, and is also suitable for related training organizations. The experiment system comprises a user interface module, a PCM coding decoding module, a switching network module, a switching control module, a signal tone generating module, a clock signal and a manual telephone traffic module, a backstage communication module, an inter-office talk module, an external line module, a signal tone detecting module, a DTMF decoding module, a direct-current output module, an A/D sampling module, a display module and a keyboard module; wherein, the user interface module comprises a simulation user interface module and a digital user interface module, the switching network module adopts a space switching module or a time switching module; the switching control module (89S52) is used as the main chip to be connected with other modules; the DTMF decoding module and the signal tone detecting module (PBL38710) are arranged close to the user interface module; the A/D sampling module (B9036A), the digital user interface module and the backstage communication module are connected together.
Description
Technical field
What the utility model programme-controlled exchange experimental system related to is a kind of programme-controlled exchange teaching experimental equipment, this system mainly be fit to college student (containing junior college, undergraduate course, postgraduate) or teacher's experiment or research with, also can be used for the training organization that is correlated with.
Background technology
At present, mainly there is following deficiency in programme-controlled exchange experimental system:
(1) pure hardware shows, the student can only test some common waveforms simply, cannot observe intuitively as for the state of the flow process of signal, working condition, each terminal, number, signaling information, the waveform of simulation and the information students such as coding of numeral of calling and called;
(2) operational module divide clear inadequately, in system, lack relevant principle and function introduction real-time collection, demonstration and feedback to information in the programme-controlled exchange process: status of equipment and relevant information in the reflection switching equipment that can be real-time, and send to the backstage by communication protocol and show;
(3) can only do some traditional experiments in the system, lack some new business functions
Summary of the invention
The utility model purpose is at above-mentioned weak point, a kind of programme-controlled exchange experimental system is provided, needs according to the programme-controlled exchange teaching, ability to accept in conjunction with the student, from theoretical and start two aspects, with from the superficial to the deep, the mode that order is progressive, write guide book of experiment and researched and developed this this exchange test of experimental facilities equipment two kinds of configuration modes are arranged: a kind of is at the existing computer room of school, for integrating educational resource, improve the needs of plant factor, computing machine as background devices, is made full use of the resources advantage of computing machine, provide abundant, experiment information attractive in appearance shows, resource management, AM/BAM communication and real-time information feedback.The programme-controlled exchange experimental system is finished 16 25 experiments in the exchange process as foreground equipment; Another kind is the school at no computing machine, and one 320 * 240 large crystal screen and 21 buttons are provided, and also can well satisfy the experimental work needs.This system mainly supply college student (containing junior college, undergraduate course, postgraduate) or teacher experiment or research with, also can be used for the training organization that is correlated with.
The programme-controlled exchange experimental system is to take following scheme to realize: the programme-controlled exchange experimental system comprises coding/decoding module, exchanging network module, switching control module, signal tone generation module, clock signal and artificial traffic module, background communication module, station-to-station call module, outer wire module, signal tone detection module, DTMF decoder module, direct current output module, A/D sampling module, display module and the Keysheet module of Subscriber Interface Module SIM, PCM.Wherein Subscriber Interface Module SIM comprises analog subscriber interface module and user's digital interface module.Exchanging network module adopts space switching module (MT8816), time switch module (ISP1016).
Divide operating system and application program on the software, application program can be divided into call treatment, safeguard and handle, manage three parts.Space switching module is made of crosspoint matrix and control store, and the central processing unit in the switching control module is got through different electronic switches by the address change of control store.
The realization of time switch module can write, control the mode of reading with order, and the mode that also can adopt control to write, call over realizes the exchange of time slot.Also can adopt the time division switching network of TST or STS.
This experimental system is core (master chip 89S52) with the switching control module, and it is connected with other modules: this system user interface module is provided with 4 analog subscriber modules, corresponding to 4 analog subscriber interfaces, can connect 4 phones; The system user interface module also is provided with 4 user's digital interfaces in addition, can link to each other with the digital interface module by these 4 interface 4 road voice; Under the control of switching control module (master chip is 89S52), signal is delivered to exchanging network module by the voice behind analog subscriber interface and the user's digital interface, carry out intercommunication or realize that by the interoffice communication module interoffice communication or outer wire module carry out outside line communication; Near Subscriber Interface Module SIM, be provided with DTMF decoder module and signal tone detection module (adopting PBL38710); A/D sampling module (B9036A), digital line module and background communication module link to each other, wherein the background communication module comprises: signal tone generation module (adopting chip AT89C205), clock signal and artificial console module (adopting chip MC145540), direct current output module, display module (LCD or computer PC are selected by the wire jumper in the experimental system upper right corner) and Keysheet module etc.When selecting the LCD version, all experiment contents can show all experiment contents on LCD under the effect of switching control module (master chip 89S52) and extended chip 82C55.The communication of this intra-office conversation analog subscriber can communicate by space switching, and digital subscriber can communicate when subscriber dialing (wherein can show number by charactron) by time switching; Interoffice communication can link to each other two experimental systems with the RS232 Serial Port Line and carry out station-to-station call.
The programme-controlled exchange experimental system has following characteristics:
1, test point is many: reserved 74 test points in the whole experimental box, but the student can observe the waveform or the data of each test point in the experimentation, and the partial test result can compare with the demonstration of PC or LCD;
2, display mode is many: display screen shows that (PC or liquid crystal display), charactron show to also have 41 light emitting diodes in (digital display when collecting the digits), the experimental box.Multiple display mode can reflect the working condition of each module, the state of each terminal, number, signaling information, the waveform of simulation and the information such as coding of numeral of calling and called as required dynamically;
3, operational module divide clear, principle and function introduction simple and clear: according to the needs of experimental work, experimental box is divided into 20 groups of operational modules.Each module is relatively independent and finish its function;
4, have relevant CAI function: each experiment principle, function introduction and experiment content all have introduction in the related experiment on PC screen and LCD, are convenient to students self study and consolidate the knowledge point of correlated curriculum;
5, to real-time collection, demonstration and the feedback of information in the programme-controlled exchange process: status of equipment and relevant information in the reflection switching equipment that can be real-time, and send to the backstage by communication protocol and show;
6, PCM and the ADPCM encoding and decoding of the 64Kbps/32Kbps/24Kbps/16Kbps that meets the ITU-T standard are arranged: make the student by experiment, can well understand the compression of international communication standard, numerical coding/decoding technique, data and observe its influence to voice quality.
Description of drawings
The utility model is described in further detail below with reference to accompanying drawing.
Fig. 1 is a programme-controlled exchange experimental system electrical principles block diagram.
Embodiment
With reference to accompanying drawing 1, the programme-controlled exchange experimental system comprises coding/decoding module, exchanging network module, switching control module, signal tone generation module, clock signal and artificial traffic module, background communication module, station-to-station call module, outer wire module, signal tone detection module, DTMF decoder module, direct current output module, A/D sampling module, display module and the Keysheet module of Subscriber Interface Module SIM, PCM.Wherein Subscriber Interface Module SIM comprises analog subscriber interface module and user's digital interface module.Exchanging network module adopts space switching module (MT8816), time switch module (ISP1016).
Divide operating system and application program on the software, application program can be divided into call treatment, safeguard and handle, manage three parts.Space switching module is made of crosspoint matrix and control store, and central processing unit is got through different electronic switches by the address change of control store.
The realization of time switch module can write, control the mode of reading with order, and the mode that also can adopt control to write, call over realizes the exchange of time slot.Also can adopt the time division switching network of TST or STS.
This experimental system is core (master chip 89S52) with the switching control module, and it is connected (as shown in Figure 1) with other modules: this system user interface module is provided with 4 analog subscriber modules, corresponding to 4 analog subscriber interfaces, can connect 4 phones; The system user interface module also is provided with 4 user's digital interfaces in addition, can link to each other with the digital interface module by these 4 interface 4 road voice; Under the control of switching control module (master chip is 89S52), signal is delivered to exchanging network module by the voice behind analog subscriber interface and the user's digital interface, carry out intercommunication or realize that by the interoffice communication module interoffice communication or outer wire module carry out outside line communication; Near Subscriber Interface Module SIM, be provided with DTMF decoder module and signal tone detection module (adopting PBL38710); A/D sampling module (B9036A), digital line module and background communication module link to each other, wherein the background communication module comprises: signal tone generation unit (adopting chip AT89C205), clock signal and artificial console unit (adopting chip MC145540), direct current output module, display module (LCD or computer PC are selected by the wire jumper in the experimental system upper right corner) and Keysheet module etc.Are all experiment contents at switching control module (master chip 89S52) and extended chip 82C55 when selecting the LCD version? effect under on LCD, can show all experiment contents.The communication of this intra-office conversation analog subscriber can communicate by space switching, and digital subscriber can communicate when subscriber dialing (wherein can show number by charactron) by time switching; Interoffice communication can link to each other two experimental systems with the RS232 Serial Port Line and carry out station-to-station call.
The module of programme-controlled exchange experimental system and function introduction
Subscriber Interface Module SIM is made of analog line interface module and user's digital interface module, finishes BORSCHT seven big functions.
B (feed),
O (overvoltage protection),
R (ring),
S (supervision),
C (coding and decoding),
H (mixing),
T (test)
(1) analog subscriber interface module: the analog line interface module is finished the BORS function, hybrid circuit is finished two/four lines conversion (conversions of simulation two wires two-way signaling and four line one way signals) function; In this experimental system, Subscriber Line Interface Circuit comprise to the substation constant-current feeding, after called subscriber's phone is presented ringing-current, user's off-hook voluntarily two of the detection of amputation ringing-current, dislodging machine, voice signal four lines conversions.
(2) user's digital interface module: constitute by wave filter and PCM/ADPCM coder, finish simulated voice and digitally coded conversion; In this experimental system, the user's digital interface module can be finished the PCM encoding and decoding of 64kbps speed, the ADPCM encoding and decoding of 32kbps speed, the ADPCM encoding and decoding of 24kbps speed and the ADPCM encoding and decoding of 16kbps speed, can be more different encoding and decoding effect during encoding and decoding speed;
(3) exchange network is made up of space division switching network, time division switching network.In this experimental system, the voice signal of simulating is carried out space switching, the digital signal behind the encode/decode audio signal is carried out time switching;
(4) the signal tone generation module is finished the generation function of analog subscriber signaling, promptly is created in the various signal tones of substation and interoffice transmitting control information.Comprise dialing tone, busy tone, ring-back tone, howler tone, idle tone, toll offering sound etc.In this experimental system, produce the various sinusoidal signals signal tone different, satisfy the requirement of subscriber signaling with break-make ratio by signal generator.
(5) switching control module is finished the signal exchange function between detection, control and the user to User Status.Native system is sent control word and is detected the monitoring wire state by single-chip microcomputer, according to the needs of 25 experiments of 15 classes, corresponding module in switching matrix and this experimental system is controlled and is operated.
(6) clock signal and artificial traffic module provide the input and output of the sound signal of the work clock of experimental box and artificial console.Needed several groups of work clock signals are directly provided or are provided behind frequency division by crystal oscillator or crystal respectively in the native system.This module also can provide the bus of numeral, sending and receiving time slot, the test of audio frequency input, output and the earphone jack and the microphone of artificial console.
(7) the background communication module finish between experimental box and the PC serial ports communicate by letter or experimental box and LCD screen controller between communicate by letter.In communication unit, by self-defining communication protocol, the data that produce in the experimentation are sent to the backstage reliably, simultaneously also will be with the instruction on backstage the correct switching control unit of giving experimental box.；
(8) station-to-station call module is finished the communication function between analog exchange between the exchange test case.In this experimental system,,, simulate the communication between the user of two different offices number by realizing two conversations between the experimental box for the communication between analog exchange.And interoffice signaling China adopts " No. 1, China " and " signalling system No.7 " two kinds are arranged, because complexity is too finished by self-defining simple signaling temporarily in this experimental box.
(9) outer wire module is finished communicating by letter between this Private Branch Exchange PBX interior lines and the outside line, and has the function that echo suppresses.Be provided with outer wire module in this experiment, when getting an outside line, add and dial a striking out number, dial outside line key again after hearing dialing tone; Beat interior lines as outside line and then adopt No. 11 phones of access earlier, change the mode of next phone over to after chance is busy, and be provided with echo inhibition circuit.(, then can dial extension number if voice suggestion is arranged.This version experimental box does not have phonetic function).
(10) the signal tone detection module is finished the detection to the outside line signaling-information.When communicating by letter, must detect the signal tone of outside line, so that the switching control unit of experimental box is understood the state (" doing " or " spare time " as outside line) of outside line with outside line.
(11) DTMF decoder module work that touch-tone signal is collected the digits and decodes, and decoded results shown decimal numbers with 7 sections charactrons respectively, L11, L12, four luminotrons of L13, L14 show binary-coded decimal, PC or LCD screen show three kinds of display modes;
(12) direct current output module provides the output of the direct current that can adjust size.Adjustable potentiometer is provided in this experiment, adjusts the output of DC voltage by the size of adjusting resistance value, for pcm encoder.The effect of direct current coding can reflect the result of pcm encoder the most intuitively: select for use LCD display to show experimental data and state or be dealt into PC by communication module in native system and show.
(13) A/D sampling module by real-time sampling, is delivered to the backstage with the waveform of data in result of experiment and the pilot process and is shown; In this experimental system, the sound signal on the channel is carried out real-time sampling, the information that changes into digital signal after the sampling is delivered to the backstage show, can reflect the process of experiment so dynamically, deepen experimenter's understanding.
(14) display module: constitute by 640 * 320 LCD display, test the Presentation Function of introduction, experimental state and experimental data when finishing no PC version;
The selection and the control of on-screen menu, experimental state when (15) Keysheet module is finished no PC version.In this experimental system, be provided with 21 buttons altogether.
Experimental project that the programme-controlled exchange experimental system can be carried out and simple the introduction:
Experiment one, experimental box functions of modules
1, experimental box is made of phone (4), subscriber's line circuit (4), exchange network, control/detecting unit, central processor unit, signaling unit, clock signal unit, communication unit, trunk interface, display module and Keysheet module (demonstration and keyboard are finished by PC in the PC version).
2, the experimental box module principle is introduced
3, experimental box intermodule relation is introduced
4, experimental box operation instruction
Experiment two, Subscriber Line Interface Circuit and two/four line transducers experiment (using chip PBL38710)
1, user interface circuit function introduction
2, two/four line transfer principles are introduced
3, two/four line converted measurements are introduced
Experiment three, user get/the on-hook signal test experience
1, gets/introduction of on-hook circuit function
2, get/on-hook
3, get/the on-hook experiment
Experiment four, signal tone and ringing-current experiment
1,450HZ signal tone classificating introduction (busy tone, dialing tone, howler tone, idle tone, ring-back tone, warning tone)
2, the signal tone effect is introduced
3, the measurement of signal tone
4, subscriber signaling experiment
Experiment five, dual tone multi-frequency dtmf/pulse transmitting-receiving experiment
1, the Pulse Dialing/principle that collects the digits introduction
2, the pulse signal number of sending out/experiment collects the digits
3, the dtmf signal principle is introduced
4, the transmission of dtmf signal, acceptance, coding/decoding experiment
Experiment six, programme-controlled exchange PCM coding/decoding experiment (using MC145540)
1, PCM coding/decoding principle is introduced
2, PCM coding/decoding chip functions is introduced
3, the PCM coding/decoding of direct current signal experiment
4, the PCM coding/decoding of voice signal experiment
Experiment seven, the comparative experiments of PCM/ADPCM coding/decoding performance
1, the ADPCM principle is introduced
2, ADPCM coding/decoding experiment
3, PCM and ADPCM coding/decoding performance are relatively
Experiment eight, switching matrix experiment
1, the air separation/time division exchange principle is introduced
2, exchange chip function introduction
3, switching matrix switches experiment
4, conversation experiment
Experiment nine, the experiment of interoffice junction interface communication
1, the interoffice junction signaling is introduced
2, the interoffice signaling experiment is introduced
3, go out/incoming call control experiment
4, trunk interface Emulated LAN communication system experiment (daisy chain, multi computer communication)
Experiment ten, artificial console experiment
1, the human relay working principle is introduced
2, artificial telephone traffic transfer experiment
Test 11, compbined test one ... the conversation experiment
1, programme-controlled exchange conversation principle introduction
2, programme-controlled exchange conversation experiment
Test 12, compbined test two ... switch is safeguarded experiment
1, the programme-controlled exchange number of joining experiment
2, programme-controlled exchange changes office's number experiment
3, programme-controlled exchange raise-position experiment
Test 13, compbined test three ... switch charges and tests
1, programme-controlled exchange charging principle is introduced
2, get the calling number experiment
3, get the called number experiment
4, air time timing
5, rate is revised experiment
6, charging/formation ticket experiment
Test 14, the secondary development experiment
JH5003 adopts general 51 series monolithics to carry out control operation, makes things convenient for the user to carry out secondary development, and has adopted the AT89S family chip of atmel corp, has the ability of system programmable, has saved the cost of buying programmable device and emulator for the user.The JH5003.lib that cooperates prompt brightness company to propose, the user is as long as study C Programming with Pascal Language just can be write the control program of oneself based on JH5003 programme-controlled exchange experimental box easily, and be carried out emulation, and the rapid prototyping that carries out What You See Is What You Get melts.
Claims (4)
1. a programme-controlled exchange experimental system is characterized in that experimental system comprises coding/decoding module, exchanging network module, switching control module, signal tone generation module, clock signal and artificial traffic module, background communication module, station-to-station call module, outer wire module, signal tone detection module, DTMF decoder module, direct current output module, A/D sampling module, display module and the Keysheet module of Subscriber Interface Module SIM, PCM; Wherein Subscriber Interface Module SIM comprises analog subscriber interface module and user's digital interface module, and exchanging network module adopts space switching module (MT8816), time switch module (ISP1016);
This experimental system is a master chip with switching control module (89S52), is connected with other modules: this system user interface module is provided with 4 analog subscriber modules, corresponding to 4 analog subscriber interfaces, connects 4 phones; The system user interface module also is provided with 4 user's digital interfaces in addition, links to each other with the digital interface module by these 4 interface 4 road voice; Under the control of switching control module (89S52), signal is delivered to exchanging network module by the voice behind analog subscriber interface and the user's digital interface, carry out intercommunication or realize that by the interoffice communication module interoffice communication or outer wire module carry out outside line communication; Near Subscriber Interface Module SIM, be provided with DTMF decoder module and signal tone detection module (PBL38710); A/D sampling module (B9036A), digital line module and background communication module link to each other.
2. programme-controlled exchange experimental system according to claim 1 is characterized in that the background communication module comprises signal tone generation unit (AT89C205), clock signal and artificial console unit (MC145540), direct current output module, display module and Keysheet module
3. programme-controlled exchange experimental system according to claim 1 is characterized in that space switching module is made of crosspoint matrix and control store.
4. programme-controlled exchange experimental system according to claim 1 is characterized in that interoffice communication adopts the RS232 Serial Port Line that two experimental systems are linked to each other and carry out station-to-station call.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNU2007200368860U CN201035822Y (en) | 2007-05-09 | 2007-05-09 | Program controlled switch experiment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200368860U CN201035822Y (en) | 2007-05-09 | 2007-05-09 | Program controlled switch experiment system |
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| CN201035822Y true CN201035822Y (en) | 2008-03-12 |
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| CNU2007200368860U Expired - Fee Related CN201035822Y (en) | 2007-05-09 | 2007-05-09 | Program controlled switch experiment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354579A (en) * | 2013-05-28 | 2013-10-16 | 广东翼卡车联网服务有限公司 | Method and system for DTMF (dual tone multifrequency) decoding based on recording synchronization |
| CN110880271A (en) * | 2019-11-08 | 2020-03-13 | 南京工业职业技术学院 | Automatic demonstration system device for working principle of program-controlled exchange T-shaped connector |
-
2007
- 2007-05-09 CN CNU2007200368860U patent/CN201035822Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354579A (en) * | 2013-05-28 | 2013-10-16 | 广东翼卡车联网服务有限公司 | Method and system for DTMF (dual tone multifrequency) decoding based on recording synchronization |
| CN110880271A (en) * | 2019-11-08 | 2020-03-13 | 南京工业职业技术学院 | Automatic demonstration system device for working principle of program-controlled exchange T-shaped connector |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080312 Termination date: 20100509 |