CN2205614Y

CN2205614Y - Anti-theft alarm rosette for automatic telephone line

Info

Publication number: CN2205614Y
Application number: CN 94209884
Authority: CN
Inventors: 熊荣安
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-23
Filing date: 1994-04-23
Publication date: 1995-08-16
Anticipated expiration: 2004-04-23

Abstract

The utility model provides an anti-theft alarm connection box for an automatic telephone line, belonging to an additional device of the wire telephone communication equipment in the telecommunication field. The anti-theft alarm connection box for an automatic telephone line comprises a box body, connection terminals, and a monitoring alarm circuit arranged between the connection terminals. The circuit is composed of a protective circuit, a voltage sample circuit, an electronic switching circuit, a pulse control circuit, a checking oscillating circuit and an alarm limiting circuit. The anti-theft alarm connection box for an automatic telephone line not only has the connection function but also has the function of preventing the line being embezzled and alarming. When once a telephone is lapped from the program control office to the telephone line at the front of the connection box, the monitoring alarm circuit work to restrict the telephone not to make a call, and alarms.

Description

Anti-theft alarm rosette for automatic telephone line

The utility model provides a kind of automatic telephone circuit the anti-terminal box of usurping, report to the police, and belongs to the attachment device of a kind of wire-telephony equipment in the field of telecommunications.

In the existing telephone line, telephone set joins by the output feeder of terminal box and program control office.At present, widely used terminal box only has the simple function of wiring, inserts telephone set if any the people before program control office and terminal box, just can usurp user's telephone line fraudulently phone, makes the user suffer economic loss, and the user is difficult for discovering, and can't prevent.

The purpose of this utility model provides the anti-terminal box of usurping, report to the police of a kind of automatic telephone circuit, and it not only has connection function, and has concurrently and prevent to usurp user telephone line and warning function.

The anti-terminal box of usurping, report to the police of automatic telephone circuit provided by the utility model; by box body, inlet wire binding post 1.1 ', outlet binding post 2.2 ' form; terminal box inlet wire binding post 1.1 ' and outlet binding post 2.2 ' between be connected to monitoring, anti-ly usurp, warning circuit; described monitoring, anti-usurp, warning circuit is by the protective circuit I; the voltage sample circuit II; the electronic switching circuit III, the circuit IV is adjusted in pulse, detects oscillating circuit V and warning, restricting circuits VI composition.The voltage sample circuit II is connected between two output lines of protective circuit I; voltage sampling signal acts on the input of electronic switching circuit III; the control signal of electronic switching circuit III output is added in the input that the circuit IV is adjusted in pulse; pulse is adjusted the pulse signal of circuit IV output and is delivered to detection oscillating circuit V; the output signal that detects the oscillating circuit V is added in warning; the input of restricting circuits VI; finish sampling by voltage sample circuit to feeder line voltage; identification is plucked; hook state; and the sampling voltage signal delivered to the electronic switching circuit III; this voltage signal and the current signal of stealing line phone or subscriber phone; determined electronic switching circuit to adjust the control signal of circuit IV output to pulse; the operating state that the circuit IV is accepted this control signal adjustment oneself is adjusted in pulse; and to detecting oscillating circuit V output pulse signal; this pulse signal oscillating circuit V after testing detects back output one control signal, and control is reported to the police; the operating state of restricting circuits.

Protective circuit I of the present utility model is by diode D1; piezo-resistance R0 and voltage-stabiliser tube W1 form; W1 and R0 parallel connection again be connected to after diode D1 connects two binding posts 11 ' between; wherein D1 has the ringing-current buffer action; the voltage sample circuit II; by resistance R 1; R2; R3 and voltage-stabiliser tube W2 form; resistance R 1 voltage-stabiliser tube W2 and resistance R 2 are connected between back access protective circuit two output lines successively; resistance R 3 is delivered to the electronic switching circuit III from resistance R 2 and the node extraction voltage sampled signal of voltage-stabiliser tube W2; the electronic switching circuit III; by transistor BG1; BG2; resistance R 4; R5; R7 capacitor C 1 and diode D3 form; transistor BG1; the emitter of BG2 be connected on binding post line 1 ' on; resistance R 4; R5 is serially connected with on the collector electrode of transistor BG1; capacitor C 1 is connected to its emitter and inter-collector; the collector electrode of transistor BG2 and two resistive junction are joined; its base stage by resistance R 7 be connected on binding post 2 ' on; at binding post 1 ' 2 ' the be connected to opposite diode connected in parallel D3 of two directions; D4, voltage sampling signal is introduced from the base stage of transistor BG1.The circuit IV is adjusted in pulse, by transistor BG3, the voltage-stabiliser tube W3 and the collector resistance R6 that are connected to its emitter-base bandgap grading form, the control signal of electronic switching circuit III from the collector electrode of transistor BG1 via transistor BG3 base stage, control impuls is adjusted the output of circuit, detect, the oscillating circuit V is by delay generator IC and peripheral resistance R 8 thereof, R9, capacitor C 2, C3 forms, resistance R 8, capacitor C 2 series connection backs and 4 of delay generator, 8 pin join, resistance R 8, the node of capacitor C 2 is while and input pin 2 again, 6 pin join, resistance R 9 is connected on the output pin of delay generator, pulse adjust the circuit IV through the negative pole of voltage-stabiliser tube W3 to detecting the oscillating circuit output pulse signal.Warning, restricting circuits VI, by transistor BG4, be connected to the resistance R 10 on its collector electrode, light-emitting diode D2 voltage-stabiliser tube W4 forms, light-emitting diode D2 and voltage-stabiliser tube W4 and connect after, connect with resistance R 10, the emitter-base bandgap grading of BG4 is connected on binding post line 1 ' idiostatic with the emitter of transistor BG1, BG2 in the electronic switching circuit III.

Be described in detail the operating state of the utility model under different situations below:

One, when substation when stealing the on-hook simultaneously of line phone

At this moment because no receiver off-book, between the utility model two wiring except that supervisory circuit work all the other circuit such as warnings grade all do not work, so the utility model is in the monitoring state.

Two, when stealing the line receiver off-book

Because feeder voltage drops to 8-10V; the voltage sample circuit II is by resistance R 3; low level signal is added on the base stage of transistor BG1 in the electronic switching circuit III; BG1 ends; electric current is through diode D1; through resistance R 4; R5 is to capacitor C 1 charging; make pulse adjust the work of circuit IV; through being connected on voltage-stabiliser tube W3 on the transistor BG3 emitter to 4 of the integrated circuit (IC) that detects the oscillating circuit V; 8 pin input positive pulse; this signal is after IC detects; through resistance R 9 to warning; restricting circuits output positive pulse signal is given transistor BG4 base stage; thereby make the BG4 conducting; electric current flows through from the light-emitting diode that it is connected on the collector electrode; lumination of light emitting diode is reported to the police; simultaneously line voltage distribution is reduced to below the critical voltage of telephone set normal dialing work; steal machine dial impulse spoke value is reduced can not be received by program control office; phone can't be connected; when stealing the machine off-hook, reach when hanging up more than 3 minutes; because what adopt in the detection oscillating circuit V is time-delay monostable oscillator; therefore detecting oscillator returns to original state already; this moment, circuit was protected by program control office, so whole line voltage distribution all will return to 60V, made the utility model automatically restore to monitor state.

Three, when the substation off-hook

At this moment, though feeder voltage reduces, but because the current signal of coming from substation enters transistor BG2 base stage the electronic switching circuit through resistance R 7, make transistor BG2 saturation conduction, at this moment, the collector electrode of transistor BG2 is clamped in low level with the base stage of the collector electrode of transistor BG1 and transistor BG3, so circuit IV output zero level is adjusted in pulse, make detection oscillating circuit V, warning, restricting circuits not work the substation normal talking.

Advantages such as the automatic circuit that the utility model provides is anti-to be usurped, and it is little, multi-functional that the warning terminal box has a volume, easy to use.Its circuit design is reasonable, and minimal power consumption is suitable for the supporting use with any high, medium and low shelves telephone set, use it to replace existing terminal box, do not influence the use of validated user phone, program control office therewith any phone of terminal box overlap joint all can't connect, in case and off-hook, report to the police immediately.

Description of drawings

1, frame principle figure of the present utility model

2, electrical schematic diagram of the present utility model

Box body of the present utility model, can adopt known injection moulding process production, its internal circuit, W1 selects 70V/0.25W, W2 selects 20-25V/0.125W for use, IC selects for use NE555 or NE556(to have sound, adopt when light is reported to the police) series, transistor BG1-BG4 can select 2N5551 or 2N5550,3DG84C, 2N5401 etc. for use.

Claims

1; a kind of automatic telephone circuit is anti-to be usurped; the warning terminal box; by box body; inlet wire binding post 11 '; outlet binding post 22 ' is formed; it is characterized in that between terminal box inlet wire and outlet binding post, monitoring being housed; warning circuit; described monitoring; warning circuit is by the protective circuit I; the voltage sample circuit II; the electronic switching circuit III; the circuit IV is adjusted in pulse; detect; oscillating circuit V and warning restricting circuits VI constitute; the voltage sample circuit II is connected between two output lines of protective circuit I; voltage sampling signal acts on the input of electronic switching circuit III; the control signal of electronic switching circuit III output is added in the input that the circuit IV is adjusted in pulse; pulse is adjusted the pulse signal of circuit IV output and is delivered to detection; the oscillating circuit V detects; the output signal of oscillating circuit V is added in warning; the input of restricting circuits VI.

2, according to the anti-terminal box of usurping, report to the police of the described automatic telephone circuit of claim 1; it is characterized in that described voltage sample circuit II is made up of resistance R 1, R2, R3 and voltage-stabiliser tube W2; resistance R 1; insert between two output lines of protective circuit I after voltage-stabiliser tube W2 and resistance R 2 are connected successively, voltage sampling signal transmits to the electronic switching circuit III through resistance R 3 from the tie point of voltage-stabiliser tube W2 and resistance R 2.

3, according to claim 1 or the anti-warning terminal box of usurping of 2 described automatic telephone circuits, it is characterized in that described electronic switching circuit III is by transistor BG1, BG2, resistance R 4, R5, R7, capacitor C 1 and diode D3, D4 forms, transistor BG1, the emitter of BG2 and binding post 1 ' join, resistance R 4, R5 is serially connected on the collector electrode of transistor BG1, capacitor C 1 is connected to its emitter and inter-collector, the collector electrode of transistor BG2 and resistance R 4, the tie point of R5 links to each other, its base stage is joined by resistance R 7 and binding post 2 ', resistance R 7 and BG1, be connected to diode D3 between the emitter of BG2, D4, the control signal of electronic switching circuit III output is adjusted the output of circuit VI from the collector electrode of transistor BG1 to pulse.

4, according to the anti-terminal box of usurping, report to the police of the described automatic telephone circuit of claim 1, it is characterized in that described pulse adjusts the circuit IV and be made up of transistor BG3, the voltage-stabiliser tube W3 that is connected to its emitter and the resistance R 6 on the collector electrode, voltage-stabiliser tube W3 is anodal to join with binding post 1, the control signal of electronic switching circuit III is introduced from transistor BG3 base stage, and its output pulse signal is delivered to through the voltage-stabiliser tube negative pole and detected the oscillating circuit V.

5, according to the anti-terminal box of usurping, report to the police of the described automatic circuit of claim 1, it is characterized in that described detection, oscillating circuit V are by delay generator IC and outer meeting resistance R8, R9, capacitor C 2, C3 form, be connected between the input pin 4,8 and binding post 1 ' of delay generator IC after resistance R 8, capacitor C 2 series connection, resistance R 8, the tie point of capacitor C 2 and delay generator input pin 2,6 join, and the delay generator output signal is carried to warning, restricting circuits VI from its output pin 3.

6, according to the anti-terminal box of usurping, report to the police of the described automatic circuit of claim 1, it is characterized in that described warning, restricting circuits VI, form by transistor BG4, the resistance R 10, light-emitting diode D2, the voltage-stabiliser tube W3 that are connected on its collector electrode, connect with resistance R 10 after light-emitting diode D2 and voltage-stabiliser tube W4 and the voltage-stabiliser tube W4 parallel connection, the emitter-base bandgap grading of transistor BG4 is connected with binding post 1.