CN2234158Y - Electronic device for preventing telephone line from illegal holding - Google Patents

Abstract

The utility model relates to an electronic device for preventing telephone line from illegal holding, comprising an off-hook of the main telephone, an off-hook embezzled identification circuit, a sequence control circuit, an automatic lock circuit and an automatic unlocking circuit. The utility model discloses has control relationship with the corresponding encryption device of the telephone office by the automatic lock and the automatic unlocking circuit, and the utility model can effectively prevent the telephone line from being embezzled.

Description

A kind of electronic installation that prevents that telephone line is stolen

The utility model relates to a kind ofly can prevent the phone electronic installation illegally usurped of circuit outside.

Present existing telephone anti-theft device, as " the phone sentry " of the general mechanical ﹠ electrical equipment factory of Beijing Yuhuan, " the phone cat " of Warsaw, Hubei Science and Technology Ltd. etc., the Device for anti-fraudulent use telephone line of all various titles all can not thoroughly solve the problem of fraudulent use of telephone.Because this kind Device for anti-fraudulent use telephone line (hereinafter to be referred as alarm) is actually a kind of telephone terminal folk prescription operation type warning, interference unit.This alarm is serially connected with between telephone terminal and the outer circuit, it can discern telephone terminal one side off-hook or outer circuit is usurped the phone off-hook, if outer circuit off-hook then this alarm send sound and light alarm and send interference signal and make appropriator can't use this circuit to converse.But appropriator if the side line road disconnection that is communicated with the user of circuit handle outside then usurp, it is still unblocked that then appropriator becomes the circuit of inter-exchange, each Terminal Type folk prescription operation type alarm is all ineffective, not only can not be antitheft but also can not report to the police because even its power supply also be cut off.

The purpose of this utility model provides and a kind ofly can thoroughly solve the electronic installation that phone is illegally usurped between circuit, and its adopts between telephone terminal and office grade telephone exchange and carries out the two main working method that password is replied.Because level switch one side had both limited exhalation in office, make appropriator no matter at what section, how, incorrectly just can't not dial and converse as long as send decoding earlier or decode at all.So, we can say, use device of the present utility model, unless on switch, carry out parallel operation, or learn user cipher outer (password can be changed at any time), the stolen on the line problem of phone will be completely resolved.Because the intervention of telephone office; it is antitheft to have constituted both sides' working method; also can make about the different smooth solution of striving of automatic record telephone expenses; that is: all the user that this kind replied formula telephone anti-theft device (call in the following text " automatically dialing restriction device ") is housed, occurs that telephone expenses are not bright to be increased again, reason is striven the strange land with nothing and is judged to that to result from the user indoor; the user needn't suspect by outside line again and usurps; and can search self reason, and strengthen management, guard one's interest.

The technical solution of the utility model is achieved in that

(1) in present office's level switching system, " dialing restriction function " all arranged, the user has handled the formality of this function of application use and after opening this kind function (month corresponding increase of lease 2-3 unit) in telephone office, can password be set in terminal one side and carry out 3 kinds of other dialing restriction of level: all limit (1) world/domestic/city: (2) world/national distance restriction: the restriction of (3) international long-distance, and concrete operations are as follows:

(A) restriction exhalation sign indicating number:

11---all restrictions

* four password * of 54* 2 # 2---the long-distance call restriction

33---the international long distance call restriction

Four passwords can be set up on their own and changed by the user.

(B) cancellation limited code:

Four password # of #54*

Four passwords should be when adding restriction password identical, recover dialing otherwise can't cancel restriction.

(2) utilize and according to above-mentioned dialing restriction function, manufacture an electronic installation (that is: " dialing restriction device automatically ") that meets the aforesaid operations requirement, it is serially connected with between outside line and the substation, and " dialing restriction device automatically " can discern this machine off-hook, on-hook or outside line usurps off-hook, on-hook on the one hand; On the other hand, and send above-mentioned B item " cancellation limited code " during only at this machine off-hook automatically, and simulate on-hook off-hook more automatically, after this moment, the user got final product normal dialing, conversation, talk-through user on-hook, " dialing restriction device automatically " then sends above-mentioned A item " restriction exhalation sign indicating number " automatically, automatically finish password and add lock function, after this, except that this machine, other parallel operation on the circuit are usurped because of it and are not sent PUK or PUK is incorrect, are all forbidden breathing out by switch, not only can not converse, base extremely can not dial, thereby prevents that thoroughly phone is stolen in outside line.

User such as need change the grade of dialing restriction or change password, also very convenient, only need insert security configuration key (SAVE-KEY) and insert new " dialing restriction sign indicating number " reach " cancellation limited code " in " automatically dialing restriction device ", " dialing restriction device " then automatically adopts new dialing restriction to encode behind on-hook and off-hook.

The stolen electronic installation of telephone line (as shown in Figure 1) that prevents described in the utility model comprising: this machine off-hook with usurp off-hook identification circuit 11, sequential control circuit 13, automatic lockout, unlock circuit 12, wherein, this machine off-hook meets outside line LINEA and this machine telephone wire LINEB respectively with two I/O ends usurping the off-hook identification circuit, and two control end ALM, TAV connect the controlled end of sound light alarming circuit and sequential control circuit respectively; This machine of signaling termination telephone wire LINEB of automatic lockout, unlock circuit, its power supply termination outside line LINEA, its lock end LOCK, release end UnLOOK, quiet end MUTEI are connected with the respective end of sequential control circuit respectively; The quiet output of sequential control circuit is connected with the base stage of the transistor T 1 of this electromechanics of control words break-make.

The utility model compared with prior art owing to be provided with automatic lockout, unlock circuit, has therefore improved the anti-reliability of usurping circuit, particularly can prevent the problem of the indeterminable broken string back phreaking of prior art.

With one of embodiment the utility model is elaborated with reference to the accompanying drawings, wherein:

Fig. 1 is that this principle of device is always schemed;

Fig. 2 is 11 parts among Fig. 1-" this machine off-hook with usurp off-hook identification circuit " electrical schematic diagram;

Fig. 3 is 12 parts among Fig. 1-" automatic lockout, unlock circuit " electrical schematic diagram;

Fig. 4 is 13 parts among Fig. 1-" sequential control circuit " sequential chart;

The general frame of the present utility model as shown in Figure 1.Outer circuit is told polarity through rectifier bridge D1～D4, sends into " 11 " by outside line LINEA, and " 11 " can tell this machine off-hook or outer circuit off-hook.If outer circuit off-hook is then controlled ALM and is effectively driven the luminous and SP of LD1 in the audible-visual annunciator and produce alarm sound.If this machine off-hook, it is effective then to control TAV, and delivers to time schedule controller and produce various control signals, and control automatic lockout, unlock circuit " 12 " work and this machine phone are quiet.The LOCK that locks is effective, and " 12 " send aforementioned A sign indicating number, i.e. " restriction exhalation sign indicating number ", release UNLOEK is effective, and " 12 " send " cancellation limited code ", and quiet MUTE2 is shielding this machine phone during the signaling automatically, make this machine quiet first, two also avoid subscriber dialing to disturb sends out PUK automatically.LINEA provides power supply to " 12 " " 11 " simultaneously.The SW1 switch is used for strobe pulse and dual-tone multifrequency mode.

" 11 " among Fig. 1 part is " this machine off-hook with usurp the off-hook identification circuit ", and the circuit detail drawing is plotted in Fig. 2.

When not having off-hook, the voltage of outer circuit LINEA and ground GND is between 45V～60V, and transistor T 1 conducting T2, T3 multiple tube be not by (relay indicating light LED1 works), and transistor T 4, T5, T6, T7 all end at this moment.

When this machine off-hook, this electromechanics words circuit LINEB resistance to earth reduces, and the T7 conducting makes that T5 ground level current potential increases, conducting, thereby T6 is ended, and ALM must not be electric, and warning circuit is not worked.LINEA is communicated with the substation work that makes by diode in the photoelectronic coupler with LINEB.Although this moment, outer circuit LINEA voltage was also reduced to 8～12V, T1 ends, T2, T3 conducting, and LED1 is bright, and the T4 base potential reduces and conducting, and because the T5 conducting, T6 still ends, and ALM is invalid.So behind this machine off-hook, effectively, ALM is invalid owing to T6 ends by light idol G1 conducting for TAV.

And when this machine not off-hook and outside circuit when having the people to usurp the circuit off-hook, LINEA voltage is reduced to 8～12VT1 by 45V～60V and is ended, T2, T3 conducting, T4 reduces conducting because of base potential.But this moment, so LINEB opens a way over the ground, T7, T5 ended because this machine off-hook not, thus the T6 conducting, ALM get electric effectively, the warning circuit warning.TAV is invalid, and the signaling circuit can not send " PUK " automatically, so whole circuit is limited to breathe out, can't dial.

Wherein DW1 is used for adjusting the voltage threshold of dislodging machine identification, and 1 integration time-lag action of capacitor C makes working stability.

Among Fig. 1 " 12 " partly " automatic lockout, unlock circuit " be that the whole circuit of automatic signaling circuit is illustrated in Fig. 3.IC is pulse or dual-tone multifrequency memory dialing special circuit.Switch SW 1 is used for selecting two kinds of mode of operations.

Break-make ratio when switch SW 2 is used for the strobe pulse dialing.Resistance R 1～R5 and capacitor C 1～C3 composition are provided with keyboard.Wherein storage key S (stove), memory location key U (UNLOCK-unblank) and L (LOCK-lock) are external as external safety-key with 4 core plugs, insert the back by owner in the time of need being provided with and use.After accomplishing the setting up transfer to preserve, in case not careful or other people misplace.When the LOCK line effective, the K1 conducting, the TONE of IC (dual-tone multifrequency output) end sends the DTMF standard audio, talk about circuit LINEB by transistor 2SC945 to this electromechanics and send: * 54*D4D3D2D1*1# locks.When UNLOCK is effective, send: #54*D4D3D2D1#, release.DP is pulse or signaling output, sends interrupted sign indicating number by MPSA92 to circuit LNEB.LINEA provides 3V power supply through rectifying and voltage-stabilizing to the vdd terminal of IC.The 3V battery is used for preserving the information that has deposited in.Drop-out when 470uF electric capacity can prevent to change battery.

No matter be that LOCK is effective or UNLOCK is effective, the XMT-MUTE end of IC all becomes high level, and transistor 2SC945 is connected, simulation off-hook load RL.Send mute signal by MUTE to time schedule controller simultaneously.Automatically this machine phone is temporarily turn-offed during the signaling, is kept the off hook state of external circuit by dummy load RL.The control timing of this machine off-hook, simulation off-hook, signaling, simulation on-hook etc. automatically is shown in Fig. 4.

In Fig. 4:

Tel-HOOK is this machine off-hook hook, and " ON " represents off hook state.

Tel-PHONE represents whether this machine actual voice load circuit is connected, and " ON " is for connecting load.Behind this machine off-hook, by making TAV effective after the identification of " 11 " circuit, after TAV is effective, produce the UNLOCK signal by " 13 ", trigger " 12 " and connect dummy load, send PUK automatically, at signaling phase MUTE2=" 0 ", T1 is ended, cut off this machine negative section (Tel-PHONE transfers " OFF " to), signaling finishes, and MUTE1 recovers high level, and dummy load also is cut off, this moment, MUTE2 still was " 0 ", this machine also recovers to connect, so external circuit has been realized on-hook.On-hook back MUTE2 at interval becomes high level, presses message register again, and the user will hear dialing tone.User's communication finishes, on-hook, TAV decline, and " 13 " circuit is waiting for that an on-hook produces the LOCK pulse in the back at interval, triggering " 12 " is sent automatically and is added code-locked, still connects dummy load RL by the XMT-MUTE signal during the signaling, simulation off-hook, on-hook again after signaling finishes.Thereby finish following flow process: simulate off-hook-subscriber dialing, conversation-user's on-hook-simulation off-hook-send out automatically after user's off-hook-send out automatically PUK-simulation on-hook again and add code-locked-simulation on-hook.

Above-mentioned functions of the present invention can be made the attachment device of plain old telephone separately, also can be made into terminal equipments such as having " volitional check exhalation " functional integrity telephone set, facsimile machine with speech circuit.

Design principle of the present invention and effect are: utilize switch " dialing restriction " function, device by the present invention, when user's off-hook, send out " removing the dialing restriction sign indicating number " from the trend switch, during user's on-hook, this device is sent out " dialing restriction sign indicating number ", " dialing restriction " function of the switch of seeking help automatically, when non-user's off-hook,, to the whole circuit between this device, forbid breathing out from switch, usurp thereby thoroughly wipe out outside line.

Though the present invention is described in detail with reference to specific embodiment, clearly, under the condition that does not break away from basic design principle of the present invention, those skilled in the art can multiple scheme realize basic principle of the present invention and effect.As inserting the mode of password in the present embodiment by stand-alone keypad, change into and add a dialing receiving sheet, after receiving the dialing of substation and identifying " limit is exhaled sign indicating number " it is inserted memory automatically by computer, make the existence of the imperceptible apparatus of the present invention of user, thereby upgrade to " fool " type direction.

Claims (1)

1, a kind of electronic installation that prevents that telephone line is stolen comprises this machine off-hook and usurps the off-hook identification circuit that sequential control circuit is characterized in that also comprising automatic lockout, unlock circuit; This machine off-hook connects outside line (LINEA) and this machine telephone wire (LINEB) respectively with two I/O ends usurping the off-hook identification circuit, and two control end (ALM, TAV) connects the controlled end of sound light alarming circuit and sequential control circuit respectively; This machine of signaling termination telephone wire (LINEB) of automatic lockout, unlock circuit, its power supply termination outside line (LINEA), its end (LOCK) that locks, release end (UnLOOK), quiet end (MUTE1) are connected with the respective end of sequential control circuit respectively; The quiet output of sequential control circuit is connected with the base stage of the transistor (T1) of this electromechanics of control words break-make.

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