CN2253893Y

CN2253893Y - Monitoring controller for telephone line system

Info

Publication number: CN2253893Y
Application number: CN 95207813
Authority: CN
Inventors: 刘振江
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-04-04
Filing date: 1995-04-04
Publication date: 1997-05-07
Anticipated expiration: 2005-04-04

Abstract

The utility model relates to a monitoring controller for telephone lines, composed of a signal converter, an electronic switching circuit, an acoustic-optic alarm circuit and an alarm control circuit. The utility model can trigger the alarm circuit to send out an alarm by level variation caused by abnormal signals in the telephone lines, and reach the goals of preventing embezzlement and eavesdropping, and recognizing short circuits or broken faults. The monitoring controller can be widely matched with telephones in all families.

Description

The telephone line watch-dog

The utility model relates to a kind of can the monitoring telephone line at any time, to the device that abnormal conditions are warned, can be used for the extension user instead usurp, purpose such as anti-eavesdrop, belong to the warning device technical field.

Phone be a kind of modern communication instrument of quick practicality but telephone wire from telecommunication bureau to each extension subscriber, the very long and long term exposure of circuit is very easily ly usurped by illegal pursuing profits outside on foot, causes telephone subscriber's somehow or other to suffer economic loss, causes spiritual distress.Therefore the dispute that causes, so appeal to the person of law court and happen occasionally, but because to usurp wire size sudden strong; Irregular, be difficult to be found and prevent.

The purpose of this utility model provides a kind of design of telephone line watch-dog, and it can detect rapidly when having the people to usurp wire size, and in time sends sound and light alarm signal or braking signal.

The purpose of this utility model is achieved in that utilizes a signaling conversion circuit to become control signal from the level conversion of telephone line, control an electronic switching circuit, trigger sound light alarming circuit by it again, when circuit takes place to provide sound and light alarm when unusual.A typical telephone line watch-dog comprises signaling conversion circuit 1, electronic switching circuit 2, sound alarm circuit 3, optical alarm circuit 4 and alarm control circuit 5 etc., wherein, signaling conversion circuit 1 is a bridge rectifier Z, its output connects subordinate's circuit after the R1 step-down, electronic switching circuit 2 is a multiple tube, it is by transistor V1, V2 is formed by connecting, R4 is a biasing resistor, connect the V1 base stage, its output is delivered to sound light alarming circuit from collector electrode respectively through diode V4 and V3, optical alarm circuit 4 is by transistor V5, V6 and luminous tube V10 constitute, resistance R 6 is connected to the V6 base stage, for biasing resistor V4 also is connected to the V6 base stage, V10 inserts in the V5 emitter circuit, resistance R 7 is a current-limiting resistance, sound alarm circuit 3 is by transistor V7, V8, V11, sounding ic chip and Yang Sheng device SP form, V7, V8, V11 connects into and can recover pattern plan ghyristor circuit, R5 is connected to the V8 base stage, be biasing resistor, V3 also is connected to the V8 base stage, the emitter of V7 and the collector electrode of V11 all are connected to ic chip, and the output of IC connects loud speaker SP, and capacitor C 3 is connected in parallel on the IC, R8 connects the V11 base stage, be the V11 biasing resistor, alarm control circuit 5 is a relay J, and the winding of relay J seals in teleset line X2, among the X2, its normally open contact J1 connects V1 base stage and power supply, and capacitor C 2 is connected in parallel on the winding of relay J.

In order to prevent unprincipled fellow's steal circuit, can establish an anti-line circuit 6 of stealing again, described circuit is made up of transistor V9 and capacitor C 1, and C1 links together the output of IC and the base stage of V9, its collector electrode is connected to the O point of signaling conversion circuit 1, and resistance R 3 seals in the V9 emitter circuit.

Eavesdropped by the people when preventing to make a phone call, the utility model also adds a debug circuit, and described debug circuit is made up of resistance R 2 and normally closed button A1, seals in the winding circuit of relay J after R2 and the A1 parallel connection.

Press the telephone line watch-dog that the utility model is made, can be when people's wire size of usurping that a phone call for you be arranged, in time promptly monitor the concurrent visual alarm of speaking, this alert audio signal can also send along telephone line, dried surreptitiously line person's the phone of scratching, it can't be used, reach and prevent the purpose of usurping.The utility model also has a debug circuit, when this machine uses, and when having the people to eavesdrop, can find rapidly and give the alarm.

Below in conjunction with accompanying drawing, the utility model is done further narration.

Fig. 1 is a theory diagram of the present utility model;

Fig. 2 is an electrical schematic diagram.

The signal of telecommunication among the telephone line X1 converts required polarity to behind signaling conversion circuit, line level is about 48-60V, and design electronic switching circuit and be in cut-off state this moment, when the people usurps the phone wire size, voltage on the circuit is reduced to about 10V, electronic switching circuit conducting this moment.Transistor V1, V2 output control signal after the conducting is started working sound light alarming circuit.The simulation controllable silicon of optical alarm circuit is designed to " irrecoverable type ", in case promptly after the triggering and conducting, only could turn-off behind deenergization, like this, usurps the situation of wire size, except that providing at once the warning, can also " record " get off, and also can find afterwards.Simulation controllable silicon in the sound alarm circuit then is designed to " can recovery type ", and it can also be reported to the police with by turn-offing with the conducting of electronic switching circuit.When the sounding ic chip sent alarm signal, this audio signal also was delivered on the telephone line from the signal change-over circuit after V9 amplifies, and this signal is dried phone of scratching appropriator strongly, and it can't be dialled and converse.Use the machine microphone that picks up the telephone, circuit when this electromechanics words and connect, relay J is connected, and its normally opened contact is connected to positive source with the V1 base stage, and electronic switching circuit turn-offs, and sound light alarming circuit is no longer worked, and does not influence normal talking.

When conversation, press the button A1 resistance R 2 is connected in the local circuit, and telephone line voltage is raise, simultaneously, the voltage on the relay reduces contact and disconnects, and electronic switch changes " treating work " state over to.If the voltage height, then electronic switch turn-offs; If there is human to tap a telephone, the voltage on the circuit is reduced to about 10V, alarm signal is sent in the electronic switch conducting.

More than two sections realizations to the utility model function done the narration of summarizing, below again this is further elaborated:

The signal of telecommunication among the telephone line X1 inserts the base stage of V1 again through the R1 step-down after polarity is proofreaied and correct in the Z rectification.When telephone line voltage (is generally about 48V) more than 30V, V1, V2 ends, whole watch-dog is not worked, when phreaking, its phone is once connection, voltage on the circuit is promptly reduced to about 10V, base voltage reduces, and makes V1, the V2 conducting, the power supply positive voltage is through diode V3, V4 triggers V5 respectively, V6 and V7, two groups of simulation controllable silicons that V8 forms, after the controllable silicon conducting, V10 and musical film IC send light, acoustical signal, voice signal is coupled to V9 by capacitor C 1, produces alarm signal in telephone line, import in the appropriator telephone set, strong signal disturbs its telephone set can't be dialled.And when this family phone uses, the relay J coil electricity, its normally opened contact J1 closure, the V1 base voltage raises, and V1, V2 are ended, and this watch-dog is not worked, but the telephone set normal talking.

When pressing A1, resistance R 2 seals in the telephone line, and this moment, line voltage distribution rose to more than the 30V, and relay J disconnects because of voltage reduces, and the contact disconnects.Watch-dog continues to cut out because of 30V voltage is arranged.If at this moment there is the people to eavesdrop, line voltage distribution can drop to about 10V, and watch-dog is reported to the police.After circuit recovered normally, transistor V1, V2 ended, and V7, V8 close because of the conducting of V11, and the signal of no longer sounding, V5, V6 continue to keep conducting, and V10 is luminous.

Fault such as the utility model also can detect the telephone line short circuit, open circuit.Its operating principle also is because signaling conversion circuit no-voltage output this moment, the electronic switching circuit conducting, and make warning circuit work, because of its principle is extremely simple, so repeat no more.

Each component parameters can be selected by following scope in the utility model: V1, V2, the optional germanium tube of V5, V7, as CG733 etc.; The optional silicone tube of V6, V8 is as 9013 etc.; V9 requires anti-back-pressure to want high, needs greater than the optional DG5551 of 160V; V11 is 9014; V3, V4 are general-purpose diode, optional 4148; Signaling conversion circuit optional 4007; IC is a musical film, optional KD9561; Relay requires its operating current less than 10mA, so that absorb line current as few as possible, can select reed switch relay for use; Capacitor C 2 optional appearance values are 2-5 μ, and C3 is an electrochemical capacitor; The optional 0.047-0.01 μ of C1; Resistance R 1 is 10-40M; R2 is 1-5K; R4 is 500K-2M; R5, R6 are 10-50K; R8 is 30-60K or the like.The optional 3-6V of power supply.

Claims

1. telephone line watch-dog, it is characterized in that, it comprises signaling conversion circuit 1, electronic switching circuit 2, sound alarm circuit 3, optical alarm circuit 4 and alarm control circuit 5 etc., wherein, signaling conversion circuit 1 is a bridge rectifier Z, its output connects subordinate's circuit after the R1 step-down, electronic switching circuit 2 is a multiple tube, it is by transistor V1, V2 is formed by connecting, R4 is a biasing resistor, connect the V1 base stage, its output is delivered to sound light alarming circuit from collector electrode respectively through diode V4 and V3, optical alarm circuit 4 is by transistor V5, V6 and luminous tube V10 constitute, resistance R 6 is connected to the V6 base stage, be biasing resistor, V4 also is connected to the V6 base stage, V10 inserts in the V5 emitter circuit, resistance R 7 is a current-limiting resistance, sound alarm circuit 3 is by transistor V7, V8, V11, sounding ic chip and Yang Sheng device SP form, V7, V8, V11 connects into and can recover pattern plan ghyristor circuit, R5 is connected to the V8 base stage, be biasing resistor, V3 also is connected to the V8 base stage, and the emitter of V7 and the collector electrode of V11 all are connected to ic chip, the output of IC connects loud speaker SP, capacitor C 3 is connected in parallel on the IC, and R8 connects the V11 base stage, is the V11 biasing resistor, alarm control circuit 5 is a relay J, the winding of relay J seals in teleset line X2, among the X2, its normally open contact J1 connects V1 base stage and power supply, and capacitor C 2 is connected in parallel on the winding of relay J.

2. watch-dog according to claim 1, it is characterized in that, it also is connected to an anti-line circuit 6 of stealing, described circuit is made up of transistor V9 and capacitor C 1, C1 links together the output of IC and the base stage of V9, its collector electrode is connected to the O point of signaling conversion circuit 1, and resistance R 3 seals in the V9 emitter circuit.

3. watch-dog according to claim 1 and 2 is characterized in that, it also adds a debug circuit, and described debug circuit is made up of resistance R 2 and normally closed button A1, seals in the winding circuit of relay J after R2 and the A1 parallel connection.