CN101557447A - VOIP/PSTN telephone line switcher - Google Patents
VOIP/PSTN telephone line switcher Download PDFInfo
- Publication number
- CN101557447A CN101557447A CNA2009103022656A CN200910302265A CN101557447A CN 101557447 A CN101557447 A CN 101557447A CN A2009103022656 A CNA2009103022656 A CN A2009103022656A CN 200910302265 A CN200910302265 A CN 200910302265A CN 101557447 A CN101557447 A CN 101557447A
- Authority
- CN
- China
- Prior art keywords
- telephone
- slic
- voltage
- service
- pstn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 101150012579 ADSL gene Proteins 0.000 claims description 34
- 102100020775 Adenylosuccinate lyase Human genes 0.000 claims description 34
- 108700040193 Adenylosuccinate lyases Proteins 0.000 claims description 34
- 238000013461 design Methods 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 241000320381 Tetnovirus 2 Species 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004353 relayed correlation spectroscopy Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Telephonic Communication Services (AREA)
Abstract
A VOIP/PSTN telephone line switching device can automatically implement switch on the telephone lines of all rooms of the user between common telephone service and VOIP telephone service in real time. The switching device consists of a DAA module, an SLIC module, a voltage detection circuit, a system logic controller (CPLD), a system logic controller (CPLD), and a power conversion circuit. The user does not need to change the layout of the telephone lines of the user rooms for achieving real-time automatic switch (ordinary telephone high priority) of all rooms between the common telephone and the VOIP telephone, and can correctly detects whether the telephone lines have common telephone service in real time no matter in the process of a call by picking up the telephone or the standby process of the telephone.
Description
Affiliated technical field
Main and the existing ADSL IAD of family (the Asymmetrical Digital Subscriber Loop of this intelligent switch, Integrated Access Device) the gateway product collocation is used, do not need to change the layout of telephone wire, just can realize all room call services real-time switching between VOIP (Voice Over Internet Protocol) and PSTN (Public SwitchTelephone Network) service in the family.
The present invention mainly is whether the real-time monitor user ' of a kind of energy has the method for PSTN normal telephone service existence and the hardware circuit of realizing this purpose.No matter any time open or close the PSTN normal telephone service, the design's method can both be accomplished correct detection, and telephone line in the family automatically switched to corresponding state, the phone in all rooms can be switched between PSTN plain old telephone and VOIP service.
Background technology
Along with the develop rapidly of modern network with popularize, connect internet by ADSL and entered huge numbers of families, then also to pay the telephone charges of great number on the other hand for common phone (PSTN), so VOIP IAD product begins constantly to accept for people, the user only need pay the expenses of surfing Internet of ADSL, just can obtain the dual service of voice call and access internet network.VOIP telephone line intelligence switch is exactly to switch for the user who opens the ADSL service on net provides the intelligence of the VOIP networking telephone and normal telephone service.The finishing in modern house is attractive in appearance for integral body, and all circuits all adopt cabling in the body of wall.Can will lay telephone line network again in the mutual switching of plain old telephone and VOIP service if realize the phone in all rooms, so not only bother but also waste financial resources, more influence attractive in appearance because of a lot of telephone lines in the room.The user uses this VOIP intelligence switch, only this switch need be installed in some rooms of family, do not need to change the telephone line network layout of whole family, just can easily realize the switching of all room VOIP phones and normal telephone service, and can satisfy the various isolation standards and the safety requirements of various countries' safety.
Summary of the invention
The existing VOIP IAD of product mix of the present invention product uses together, as long as be placed on the switching of phone between VOIP service and PSTN service that all rooms just can be controlled in some rooms.When user family opened normal telephone service, the number in all rooms all can be engaged plain old telephone; When this user closes normal telephone service and when opening the VOIP telephone service to telecommunication bureau application, the user does not need to change in the family any equipment and circuit can realize that just all phones make a call VOIP; And when the user opened normal telephone service once more, the design's product can detect this service automatically, and the phone in all rooms is reworked under normal telephone service.
The present invention has designed the detection method that a kind of accurate detection has or not the PSTN service: detect the voltage between telephone wire TIP and the RING, if voltage is arranged, expression has the PSTN service; On the contrary, if there is not voltage, the expression user does not open the PSTN service.Mix to cause and to make the judgement that has or not the PSTN service for solving VoIP SLIC output voltage and PSTN voltage, the employing double-pole is two puts relay, when when doing voltage detecting, cuts off VoIP SLIC circuit and connects, and switch to voltage detecting circuit, it is connected with telephone wire.Only when judging that no PSTN service exists, relay switches to VoIP SLIC circuit, is connected with telephone wire, and external telephone set uses VoIP.
In addition, the present invention has designed the mechanism that a kind of (Real Time) in real time monitoring has or not the PSTN service, and need not starts shooting again detects.The SLIC output voltage is set at-48V in this product, voltage range-38V in the PSTN network in country variant area ~-78V between, there are voltage difference between the two in the present invention's design and PSTN service, among the design, this voltage difference causes SLIC the state of off-hook (OffHook) to occur, and after CPLD detected this state, control relay disconnected VoIP SLIC circuit, switch to voltage detecting circuit one side, judge whether to have opened the PSTN traditional telephone service or be user's off-hook use phone.When PSTN voltage also be-48V about the time, can not cause SLIC off hook state to occur, at this moment, designed the mechanism of regularly doing SLIC polarity of voltage counter-rotating (PolarityReversal), after the counter-rotating of SLIC polarity of voltage, promptly can cause SLIC off hook state to occur, processing mode is the same.
Simultaneously, the present invention has designed a kind of safety partition method: utilize the isolation characteristic of DAA device, user ADSL IAD equipment and outside line are isolated effectively.Owing on the outside line high operating voltage is arranged, simultaneously owing to come in from outdoor access, have the danger of thunderbolt, on safety, this circuit is defined as the TNV-3 circuit, and VoIP FXS circuit only is used to connect interphone on the nearly all IAD of ADSL on the market equipment, and its safety grade is the TNV-2 circuit, can not directly connect between the two.In this product design, DAA telephone wire side (TIP/Ring) is connected with the FXS of user ADSL IAD equipment, so just effectively outside line and user's ADSL IAD equipment is kept apart, and has solved the safety problem.The four line voice signals of DAA are connected to the SLIC chip on the product of the present invention again, drive and provide the VoIP service channel to external telephone set.
The beneficial effect of product of the present invention is that whether detection family that can be real-time opens the PSTN normal telephone service, and switches user telephone line, makes the phone in all rooms can both realize real-time VOIP service and the switching of PSTN normal telephone service.
Description of drawings
Invention further specifies to this telephone line switcher below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the internal circuit schematic diagram of product of the present invention.
Fig. 2 uses illustration for telephone line switcher.
Fig. 3 is for answering VOIP phone software logic control flow process figure.
Fig. 4 is for dialing VOIP phone and VOIP service standby software logic control flow chart.
Among Fig. 1: 1, DAA.2, SLIC.3, LED light shows.4, the circuit transfer relay.5, power-switching circuit.6, low pass filter.7, voltage detecting circuit.8, analyzing logic control device CPLD.9, the lightning strike protection device.10, high pass filter.11, the telephone interface of this product.12, the SLIC 13 of FXO interface of the present invention and ADSL IAD docks.14, the adsl interface butt joint of adsl interface of the present invention and ADSI IAD product.16, Line connects the telephone wire that inserts this this room.17, the power supply interface of this product.
Among Fig. 2: 18, for inserting user's telephony bus.19, telephone line switcher of the present invention position.20 and the present invention in same room the ADSL IAD product of (bedroom A).21, the telephone set of bedroom A can directly connect ADSL IAD or this product.22,23,24 is the telephone set in other bedrooms or parlor, all is directly connected on the telephony bus, just can realize the switching of VOIP service and PSTN normal telephone service by this telephone line switcher.
Embodiment
For realize in the summary of the invention purpose, the technical solution adopted for the present invention to solve the technical problems wherein comprises the structural principle and the concrete annexation of inside of the present invention as shown in Figure 1.Below each device is done and described in detail.1. the DAA chip is used for isolating ADSL IAD TNV2 (secure side) and inserts outdoor telephone line TNV3 (non-secure side), accepts control off-hook or the on-hook of CPLD, and the TIP﹠amp of ADSL IAD; RING two line signals are converted into the analog signal transmission of four lines and give the SLIC chip.2. SLIC chip provides bell signal by CPLD control to the phone of outside, and whether off-hook information sends CPLD to deals with phone, and transmission and received speech signal are given DAA.3. LED light shows the online service state of current phone in the family, and the bright VOIP of being of green light serves, and red light is bright to be the PSTN normal telephone service, and its behavior also is to be controlled by CPLD.4. two system relay switches of RELAY double-pole, switch to voltage detecting one tunnel, detect outside line whether have voltage (this voltage range comprises that about 38v ~ 78v of the voltage of normal telephone service standby and off-hook are conversed or the about 6v of voltage when calling ~ 8v), in order to have judged whether the PSTN normal telephone service; When not having the PSTN normal telephone service when existing, relay switches to SLIC one end, and the VOIP telephone service externally is provided.5. Power system power conversion system is converted to the voltage of 3.3V for system works to transformer input 12VDC supply voltage.6. low pass filter low pass filter is used for filtering out the high-frequency signal of ADSL and the call voice analog signal of 0 ~ 3.4KHz by low frequency.7. Voltage detect voltage sense line, form by a forward voltage comparator and peripheral circuit, when relay switches to voltage detecting one end, voltage comparator will link together with the outside line line, and disconnect with the design's SLIC, so what detect is exactly whether the outdoor telephone line has voltage, so that judged whether normal telephone service.8. the CPLD logic controller is realized the logic determines and the control of whole system, and its control details are shown in the running software logic diagram.9. Surge protection lightning strike protection device; because it is outer online that this deisgn product will be received phone; just can be connected to the open air; interior ADSL IAD of damage of height calendering telephone wire inlet chamber or miscellaneous equipment that thunderbolt might be arranged; the lightning strike protection device just can fall the energy absorption of these high pressure, plays a protective role.10. High pass filter high pass filter is in order to filter out the voice signal of low frequency, by the ADSL signal of high frequency.Most of ADSL IAD product has had this high pass filter has been integrated in product inside.(11) ADSL IAD can provide the ADSL product of VOIP energy supply.Whole system is divided from functional module can be divided into four parts; be respectively DAA (DataAccess Arrangement); SLIC (Subscribe Line Inter-face Circuit); CPLD (ComplexProgrammable Logic Device) and normal telephone service testing circuit; certainly also have some power source conversion, the LED lamp shows and telephone wire corresponding protection circuit.
Whole design system can be divided into four modules, and the functional description of each module is as follows:
DAA: the butt joint of the SLIC interface (telephone line interface) of main realization and ADSL IAD product, so that realize the conversion of ADSLSLIC interface phone analog voice and the safety of realization ADSL IAD product SLIC circuit and outside line are isolated.
SLIC: when subscriber phone is the VOIP service, accepts the various analog signals of DAA, and export to the telephone set in other all rooms.Provide the ring service for all phones of accepting the VOIP service simultaneously.
Voltage detecting circuit: whether telephone line on have plain old telephone (PSTN) service, and give CPLD information feedback if detecting.
CPLD: realize the logic control of whole system.The information of receiving test circuit, and control DAA and SLIC are operated in corresponding mode state.
According to top described, the advance of this product can be divided into hardware aspect and software aspect two parts.Hardware aspect, (1) the design uses the two system relay switches of double-pole, when switching to voltage detecting one end, with disconnecting simultaneously and being connected of SLIC, so just can not be subjected to the SLIC output voltage influence; When switching to SLIC one side, voltage sense line will be in vacant state, promptly can not play the voltage detecting effect.Certainly the voltage that also just can by mistake SLIC be provided is judged as the normal telephone service of PSTN; (2) two line telephone speech signals with telephone set are converted to four lines transmission acknowledge(ment) signal, and then there is DAA to be converted to the voice signal of two lines, so just utilized the buffer action of DAA, SLIC one side of outdoor telephone line and ADSL IAD is kept apart, satisfy the insulation request of various countries secure side and non-secure side.The software aspect, (1) according to the introduction of back software flow pattern, the design's product is whether off hook signal can occur by SLIC, then relay is switched to voltage detecting one side and judges that the mechanism that judges whether PSTN service accomplishes whether real-time monitoring normal telephone service exists or produce.When VOIP externally is provided at SLIC service, the client has opened the pstn telephone service, if pstn telephone that should country service voltage is not-48v, like this voltage that SLIC provided just with pstn telephone voltage mistake in voltage difference, thereby cause the SLIC chip can produce off hook signal, relay will switch to the voltage detecting end and detect whether the external voltage existence is arranged this moment then; (2) provide VOIP telephone service to outside all phones as SLIC, when all phones all were in the holding state of on-hook, SLIC can constantly remove to switch generating positive and negative voltage on the telephone wire with the very short cycle.If opened the pstn telephone service client sometime like this, and PSTN Service Phone line voltage is identical just with the SLIC phone, SLIC also can export off hook signal in the positive and negative upset of voltage, thereby make relay cut off SLIC one side, and be connected to the detection whether outdoor telephone line one side has the PSTN normal telephone service.
Concrete application such as Fig. 2 connect home phoneline network (part of thick line is a telephone line among the figure).Product collocation ADSL IAD of the present invention uses together, as long as product is placed in any house, the LINE mouth of product of the present invention is connected outside line, the FXO mouth connects the FXS mouth of ADSL IAD, the DSL mouth connects the ADSL mouth of ADSL IAD, the phone in this room can be connected the FXS mouth (this moment this phone can only dial the VOIP phone) of ADSLIAD or be connected on the LINE mouth of this product (at this time the phone in this phone and other room be the relation of equity) fully, can switch in PSTN normal telephone service and VOIP service.For bedroom B, the telephone line in bedroom C and parlor is not need moving arriving fully, under the switching of the design's product, automatically switch in the VOIP telephone service when just can be implemented in cancellation PSTN normal telephone service, the PSTN normal telephone service automaticallyes switch back when opening the PSTN normal telephone service again sometime in real time.So just realized that the circuit in all rooms do not change, just can realize the switching of PSTN normal telephone service and VOIP telephone service.When pstn telephone stops, circuit can switch to the telephone set in each room on the VOIP service circuit at once automatically; If the PSTN service is open-minded again, the design's product will monitor and circuit be switched on the normal telephone service automatically, and each room call can connect again beats plain old telephone.
Fig. 3, Fig. 4 are CPLD software logic control flow chart, describe the course of work of system in detail.Advance of the present invention just is this real-time PSTN wireline inspection mechanism, off hook signal occurs by SLIC, switches to outside line one side then and judges, to realize that real time line detects and switching; Under the SLIC holding state, constantly switch the telephone wire generating positive and negative voltage, to prevent the opening PSTN normal telephone service suddenly and voltage is identical with the SLIC output voltage just and in the same way the time, SLIC can not correctly export off hook signal.
All control logics of the design system are finished by CPLD, The whole control can be divided into two logical flow charts and analyze, answer the VOIP phone and dial VOIP phone and standby two parts, as Fig. 3, Fig. 4 is respectively that system works is being answered VOIP telephone state and the running software logic diagram of dialing VOIP phone and system standby state, will be presented in the course of work of two states below in detail.
Answer VOIP phone software logic control flow process figure as Fig. 3, at first open the design's product power supply 001, the relay of CPLD in will control chart 1 is to voltage sense line one end 002, judge whether to have on the PSTN line voltage to have 003 then, if CPLD has the voltage signal that detects circuit, illustrate that normal telephone service is arranged at this moment is online at phone, relay will be in one section of detection line always like this, this moment, the design system also can enter low-power consumption battery saving mode 004, and the number in all rooms just can be engaged and connect the PSTN plain old telephone at this moment; If CPLD does not receive the voltage signal (be user cancel or do not open the normal telephone service business) of testing circuit, CPLD will control relay link to each other the SLIC of outdoor telephone line and this equipment, because this equipment is connected with ADSLIAD equipment, this moment, the VOIP phone dialed and answered to the phone in all rooms just can 005.There is the VOIP phone to call in 006 when this moment, then DAA at first can receive bell signal and the caller ID (Caller ID) that ADSL IAD sends, DAA notice CPLD has bell signal to come in then, CPLD control SLIC enters Ring Mode, and the phone in all rooms is all shaken to ring and caller id information is sent to the phone waits for user off-hook by ring and replys 007 at this moment.If this moment, user arbitrary phone was picked up then CPLD can obtain signal and DAA is also switched to off hook state, so voice pathway sets up successfully, begins to converse 008 up to end of conversation on-hook 017, comes back to that the standby mode wait is next converses; Wait ADSL IAD phone ringing to stop back the design's product if nobody replys and reenter standby mode.
For dialing VOIP phone and VOIP service standby software logic control flow chart, system boot and judgement PSTN service are all identical with Fig. 3 logic diagram up to dialing VOIP phone 005 state as Fig. 4.Need externally to make a call VOIP when this moment, when the user picks up the telephone, system detects off hook signal 012, the CPLD control relay switches to voltage detecting one end rapidly then, be used for judging that this moment, off hook signal was that user's off-hook is made a phone call or (the SLIC output voltage is set at-48V in this product owing to there is the PSTN service to enter family 011 suddenly, voltage range-38V in the PSTN network in country variant area ~-78V between, when there were voltage difference in the present invention's design and PSTN service between the two, meeting was because of the excessive off hook signal that occurs of SLIC telephone wire direct current).If do not detect the PSTN voltage signal on the outside line this moment, then switch back SLIC one end at once again, the DAA of CPLD control simultaneously enters off hook state 015, and the user just can hear that ADSL IAD passes the dialing tone of coming by DAA this moment, waits for user's Outgoing Call number.The number that this moment, the user transferred to can be transmitted to ADSL IAD equipment completely, comprises DTMF pulsing (DTMF) or pulse dialing modulation (Pulse dialing) two kinds of modulation systems 012; When not having phone to insert and transfering to promptly to provide VOIP to serve to each room, and all phones are all when standby, this moment, CPLD was with the generating positive and negative voltage 009 on continuous control of the time cycle SLIC output telephone wire, was to occur in order to detect the PSTN service in real time at holding state like this.Under PSTN service voltage and the external output voltage of SLIC conflicts mutually and both voltages are identical situation 010, SLIC off hook signal can not occur, this moment, the telephone line voltages positive-negative polarity of SLIC overturn mutually, made SLIC off hook signal occur thereby so just can form loop current with outside pstn telephone; When SLIC provides voltage and PSTN service voltage not simultaneously 011, forming direct current because both have voltage difference makes SLIC enter off hook state, thereby detected by CPLD, SLIC can both enter off hook state when accomplishing can both externally have PSTN to come in any case, the CPLD control relay disconnects SLIC rapidly then, switch to wireline inspection end 013, judgement is the phone off-hook this moment or PSTN normal telephone service turn up service 014 is arranged, if the outside line voltage that detects the PSTN normal telephone service is arranged, explanation is to cause SLIC to enter off hook state owing to PSTN service voltage occurs, then relay no longer switches back SLIC, always with insert outdoor telephone wire and be connected up to detecting the PSTN service and disappear and then switching back SLIC one side; If do not detect PSTN outside line voltage, relay then rapidly switchback SLIC one side finish user's dialing and action such as answer, up to phone on-hook end of conversation 017.
Claims (9)
1. 1. a telephone line switching device shifter comprises the DAA module, the SLIC module 2., voltage detecting circuit 7., analyzing logic control device (CPLD) 8., and power-switching circuit is 5..In the inlet chamber telephone wire (18) 4. is connected the SLIC module by relay and 2. 7. goes up with voltage detecting circuit, 1. 2. the SLIC module connect the DAA module, the DAA module connects a RJ11 telephony interface (12), be connected with the ADSL IAD SLIC interface of back (13), CPLD then connects the SLIC module, and DAA module and voltage detection module realize the control of whole logic.It is characterized in that: when this voltage detecting circuit has detected plain old telephone (PSTN) service, can and insert indoor telephone wire the SLIC module and disconnect, and be connected wireline inspection one end all the time; When not opening or cutting off sometime plain old telephone (PSTN) service, to be detected by voltage detecting circuit, CPLD will control this telephone line transfer relay and automatically circuit be switched to this SLIC module end, provide VOIP telephone service for all room calls like this.When this SLIC module is found the phone off-hook, this telephone line transfer relay can switch to circuit voltage detecting one side rapidly, judging whether has voltage on the outdoor end telephone wire, if find to have outside line voltage, then thinking has plain old telephone (PSTN) service, and relay keeps switching to the outside line direction, if instead do not monitor voltage, then switch to SLIC one side again, VOIP externally is provided service; When circuit switches to this SLIC module one side phone standby, this SLIC module is the generating positive and negative voltage of two telephone wires of upset constantly, if the outer online PSTN normal telephone service that exists, off hook state will appear in this SLIC module, switch to voltage sense line one side then rapidly, it is open-minded that voltage detecting will detect normal telephone service, and make the phone in all rooms use the PSTN normal telephone service.
2. telephone line switching device shifter according to claim 1, it is characterized in that: when PSTN voltage (voltage range-38V in the PSTN network in country variant area ~-78V between) be not-during 48V, there are voltage difference between the two in the present invention's design and PSTN service, cause SLIC off hook state to occur.Therefore when CPLD detects the SLIC off hook state, control relay disconnects SLIC one side (prevent SLIC output voltage and PSTN voltage from mixing to cause can not make the judgement that has or not PSTN service) rapidly, whether switch to voltage detecting circuit one side, differentiating has PSTN service existence to cause off-hook still to be called owing to user's off-hook.Have the PSTN normal telephone service open-minded if having voltage to exist then illustrate, relay continues to keep to cut off and link to each other with voltage detecting circuit (this moment, all room calls were the PSTN normal telephone service) with SLIC; Otherwise relay can switch back SLIC one end rapidly, and continuing provides VOIP telephone service to all room calls, and the user can dial voip phone.
3. telephone line switching device shifter according to claim 1, it is characterized in that: when circuit switches to SLIC one side and provides the standby of VOIP Service Phone to all room calls, the user has opened the pstn telephone service again in a certain moment, and PSTN voltage just in time is-during 48V (to produce voltage identical with SLIC), can not cause this product SLIC off hook state to occur, SLIC meeting timing cycle (5 seconds, 1 minute, 30 minutes or the like can set) generating positive and negative voltage polarity on two telephone wires of upset, will make this moment SLIC go up the generation electric current and off hook signal occur, switch to voltage sense line one side then rapidly, it is open-minded that voltage detecting will detect normal telephone service, and make the phone in all rooms use the PSTN normal telephone service.
4. telephone line switching device shifter according to claim 1 is characterized in that: realize that ADSLIAD equipment phone port to the safety isolation between outside line, satisfies the safety insulation request.ADSL IAD telephone line interface (FXS) is defined as the TNV-2 circuit, and telephone wire inlet chamber the inner in outside is the TNV-3 circuit, considering both circuits based on safety is can not be direct-connected, and present design has the isolating device of adding DAA, satisfies the double requirements of voice communication and safety.
5. according to the telephone line switching device shifter under the claim 1, it is characterized in that: comprising a LED light and show, is to be used for showing that telephone line is that plain old telephone (PSTN) service state or VOIP service state are the operating state of subsets at present.
6. according to the telephone line switching device shifter under the claim 1, it is characterized in that: comprising a power-switching circuit, is to be used for converting external voltage to this switching device shifter required voltage.
7. according to the telephone line switching device shifter under the claim 1, it is characterized in that: comprising a high pass filter, is the voice signal that is used for filtering low frequency, by the ADSL signal of high frequency.
8. according to the telephone line switching device shifter under the claim 1, it is characterized in that: comprising a low bandpass filter, is the high-frequency signal that is used for filtering ADSL, only allows the telephone speech signal of 0 ~ 3.4KHz to pass through.
9. according to the telephone line switching device shifter under the claim 1, it is characterized in that: comprising a lightning strike protection device, is to be used for avoiding this device to be struck by lightning and the high-energy voltage that produces destroys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103022656A CN101557447B (en) | 2009-05-13 | 2009-05-13 | VOIP/PSTN telephone line switcher |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103022656A CN101557447B (en) | 2009-05-13 | 2009-05-13 | VOIP/PSTN telephone line switcher |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101557447A true CN101557447A (en) | 2009-10-14 |
| CN101557447B CN101557447B (en) | 2011-05-11 |
Family
ID=41175386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103022656A Expired - Fee Related CN101557447B (en) | 2009-05-13 | 2009-05-13 | VOIP/PSTN telephone line switcher |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101557447B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103200342A (en) * | 2013-04-10 | 2013-07-10 | 苏州智聚电子科技有限公司 | Communication equipment based on public telephone network and internet |
| CN103457781A (en) * | 2012-05-28 | 2013-12-18 | 华为终端有限公司 | Telephone service switching control method and telephone service uplink gateway |
| CN104348988A (en) * | 2013-08-08 | 2015-02-11 | 国基电子（上海）有限公司 | Telephone network accessing equipment |
| CN113256947A (en) * | 2021-06-22 | 2021-08-13 | 江西师范大学 | Alarm device for preventing articles from being lost |
-
2009
- 2009-05-13 CN CN2009103022656A patent/CN101557447B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103457781A (en) * | 2012-05-28 | 2013-12-18 | 华为终端有限公司 | Telephone service switching control method and telephone service uplink gateway |
| CN103457781B (en) * | 2012-05-28 | 2017-02-08 | 华为终端有限公司 | Telephone service switching control method and telephone service uplink gateway |
| CN103200342A (en) * | 2013-04-10 | 2013-07-10 | 苏州智聚电子科技有限公司 | Communication equipment based on public telephone network and internet |
| CN104348988A (en) * | 2013-08-08 | 2015-02-11 | 国基电子（上海）有限公司 | Telephone network accessing equipment |
| US9363385B2 (en) | 2013-08-08 | 2016-06-07 | Ambit Microsystems (Shanghai) Ltd. | Telephone network access device |
| CN113256947A (en) * | 2021-06-22 | 2021-08-13 | 江西师范大学 | Alarm device for preventing articles from being lost |
| CN113256947B (en) * | 2021-06-22 | 2023-11-10 | 江西师范大学 | Alarm device for preventing articles from losing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101557447B (en) | 2011-05-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100188495B1 (en) | Method for performing intelligent network services , with an isdn network terminator located at a subscriber's premise | |
| US4490583A (en) | Plural line telephone controller | |
| CN101557447B (en) | VOIP/PSTN telephone line switcher | |
| US5530951A (en) | Telephone line sharing apparatus | |
| CN103200469A (en) | Method utilizing passive optical network (PON) system access terminal to achieve internet protocol (IP) voice service call simulation | |
| CN201114579Y (en) | Inter-speaker and phone system interface device | |
| CN104735669A (en) | Method and system for realizing access of mobile phone to internal secure communication network based on Bluetooth | |
| CN101217605B (en) | A bus-mode paging telephone | |
| US20090110161A1 (en) | Digital telephone interface device | |
| CN201839339U (en) | Improved SDH (synchronous digital hierarchy) optical transmission system official telephone module | |
| CN201657017U (en) | Gateway of intelligent home system | |
| CN201682546U (en) | Conversation adapter | |
| CN104954584B (en) | Cordless telephone system | |
| CN101753731B (en) | Fixed telephone terminal | |
| CN104639744B (en) | GSM/PSTN (global system for mobile communication/public switched telephone network) automatic switching device | |
| CN101227535B (en) | Method for transmitting data and port conversion equipment | |
| CN108322238A (en) | Integrated form computer room call module and its communication device for lift, elevator communication system | |
| CN104159169B (en) | A kind of remote speech intercom system | |
| CN219499396U (en) | Emergency communication technical equipment based on inter-city railway tunnel section | |
| CN203708294U (en) | One-button call extension device | |
| CN2759073Y (en) | Switching circuit apparatus connected with external and internal wire mode | |
| US7349536B1 (en) | Techniques for providing uninterrupted digital communications to customers coupled to local loop generation equipment | |
| CN201839348U (en) | Telephone device configured with secretary phone capability | |
| CN207995083U (en) | Integrated type elevator computer room call module and its communication device for lift, communication system | |
| CN100375485C (en) | Automatic on-hook controller of telephone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: WUXI MITRASTAR NETWORK TECHNOLOGY CO., LTD. Free format text: FORMER NAME: ZYXEL TECHNOLOGY (WUXI) CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 214028 Jiangsu Province, Wuxi City District Road No. 60-E Minshan block Patentee after: Wuxi Alliance Network Technology Co., Ltd. Patentee after: Liu Tao Patentee after: Zhang Ailin Patentee after: Tang Tian Patentee after: Song Yaohua Patentee after: Chen Zhengmin Patentee after: Liu Bangjie Patentee after: Guo Chongyi Address before: 214028 Jiangsu Province, Wuxi City District Road No. 60-E Minshan block Patentee before: Zyxel Technology (Wuxi) Co., Ltd. Patentee before: Liu Tao Patentee before: Zhang Ailin Patentee before: Tang Tian Patentee before: Song Yaohua Patentee before: Chen Zhengmin Patentee before: Liu Bangjie Patentee before: Guo Chongyi |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110511 Termination date: 20140513 |