CN2175991Y - Monitering alarm for telephone circuit fault and illegal bridging telephone - Google Patents

Abstract

The utility model relates to a monitoring alarm for telephone circuit faults and illegal bridging telephones, comprising a distinguishing link 1 for line status and a detecting link 2 for local states; the output of the two links are both conveyed to a comprehensive logical distinguishing link 3 which starts up or prohibits an alarm generating link 4 working after distinguishing. The monitoring alarm which is composed of a CMOS circuit and transistors can immediately give an acoustic-optical alarm when the circuit is stolen for parallel operation, prevent the stealing actions for parallel operation in time, give an alarm when interruption or short circuit faults appear in the circuit and help maintenance persons find a fault place. The utility model has the advantages of complete functions, small power consumption, cheap running cost, small size, low cost and performance indexes obviously better than products in the prior art.

Description

Monitering alarm for telephone circuit fault and illegal bridging telephone

The utility model relates to wired field of telephone communication, particularly relates on a pair of telephone line illegal and connect the monitoring alarm of another telephone set conversation.

The wire-telephony of prior art, substation directly are connected on the telephone line terminal.But, circuit enter the user indoor before, privately phone is attempted by if any the lawless person and usurps conversation on the circuit, will make the user suffer extra economic loss.For making the user can monitor this malfeasance and line interruption or short circuit fault, in time report to the police, people once designed and produced some attachment device, it is serially connected between telephone line and the substation, if someone is illegal parallel operation before this attachment device, as long as he carries machine uses, device can be reported to the police so.Though such attachment device has basic monitoring and warning function, can not in time stop malfeasance, and circuit design imperfection itself, volume is big, power consumption is many, is not well suited for the user and uses.

But the purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and provides the very simple function ratio of a kind of circuit structure more complete monitoring alarm, constitute with very little CMOS integrated circuit of power consumption and bipolar transistor, can: utter a word immediately when 1. circuit is usurped by parallel operation, light reports to the police; 2. in time stop parallel operation to usurp behavior; Report to the police when 3. interruption or short circuit fault appear in circuit; 4. auxiliary line is looked into and is repaiied the people finder position of fault.

The purpose of this utility model can reach by following measure: formulate a kind of telephone line fault and illegal parallel operation monitoring alarm, comprise that line status is differentiated link and local state detects link, both output is delivered to integrated logic in the lump and is differentiated link, starts after the differentiation or forbids the work of alarm signal generation link.Described line status is differentiated link, and its output that detects rectifier bridge is connected to the input of dividing potential drop-voltage limiter; Local state detects link and comprises two in the antiparallel Light Coupled Device of input, and they are connected in this machine talking path; Described integrated logic differentiate link comprise one with-inverter that not gate and output thereof were connected; Alarm signal generation link comprises speech synthesizer and two transistors, the output of this speech synthesizer and a transistorized input termination integrated logic differentiation link, the voice signal that is taken place amplifies rear drive loud speaker sounding through another transistor, by transformer alarm voice is sent into circuit simultaneously, disturb illegal parallel operation to use.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the logic block-diagram of the utility model monitoring alarm;

Fig. 2 is the electrical schematic diagram of the utility model monitoring alarm.

Be described in further detail below in conjunction with the most preferred embodiment shown in the accompanying drawing:

Monitoring alarm of the present utility model is seen Fig. 1, its A, B terminal line road, and a, b terminal meet the master and go into phone.Device comprises that line status is differentiated link 1 and local state detects link 2, and both output is delivered to integrated logic in the lump and differentiated link 3, starts after the differentiation or forbids 4 work of alarm signal generation link.In the device, see Fig. 2,

A. line status is differentiated link 1, and its output that detects rectifier bridge 11 is connected to the input of dividing potential drop-voltage limiter 12.When normal and this machine of circuit is hung up, circuit is sent about 48 volts of direct voltages here, no matter the A line for just still B line for just, the input of dividing potential drop-voltage limiter 12 always just, through R1, R2 dividing potential drop, after C1, the Z1 pressure limiting, not to be higher than " line status is normal " signal input inverter U1:A(13 of 3 volts), just export under the situation that this inverter U1:A is only normal at line status, this machine is hung up again " 0 ";

B. local state detects link 2, comprises two at the antiparallel Light Coupled Device U2(21 of input) and U3(22), they are connected in this machine talking path.When line fault or this machine are hung up; the light-emitting diode of U2 and U3 does not have current flowing; their phototriode all ends; thereby output all is " 1 " (high level); only at circuit during normal or illegal parallel operation; this machine is proposed the machine conversation again, and an output " 0 " (low level) is just arranged among both.

C. integrated logic is differentiated link 3, comprises and-not gate U1:B(31) and inverter U1:C(32 that output was connected), link 1 differentiation result and link 2 testing results are imported U1:B in the lump and are done the logical computing, export from U1:C at last.In fact inverter U1:C only just exports " 1 " in the time must reporting to the police.Link 3 is carried out discrimination result according to the different conditions combination, sees Table 1.

D. alarm signal generation link 4 comprises speech synthesizer U4(41) and two transistor Q1(42), Q2(43), the output of the U1:C of the input T-Ring of U4 and Q1 joint 3.When U1:C is output as " 1 ", U4 work, the voice signal of generation is delivered to the Q2 base stage, amplifies through Q2, drives loud speaker SP sounding with its collector current, by transformer TR and capacitance C2 alarm voice is sent into circuit simultaneously, disturbs illegal parallel operation conversation.The emitter current of Q1 flows through LED through resistance R 5, sets up light warning.

Line status is differentiated the detection rectifier bridge 11 of link 1, and connect button AN after, cross-over connection is between telephone wire A, B.As long as click AN, get final product short circuit incoming telephone line A-B, make the phone that inserts privately lose voltage fully, use so that in time end illegal parallel operation.

Be provided with double-pole multithrow switch K in the utility model circuit, make function of use for the user and select.See Fig. 2, the moving contact of K-1 meets A(a) line, an one fixed contact connects transformer TR one end; The moving contact out-put supply of K-2 meets VCC, and two fixed contact also connects battery B anode.The user has three selections, and in the position 1, the line of K-1, K-2 moving contact all is connected to unsettled

Fixed contact, battery B does not power, transformer TR output open circuit, thereby be the position of not using this monitoring alarm; In the position 2, battery B power supply is connected across between telephone line a, the b behind the transformer TR output winding serial connection capacitance C2, sends alarm voice to circuit.Like this, not only when conversing, the illegal parallel operation of lawless person disturbs the dialing or the conversation of he (she), making it parallel operation smoothly usurps, and interrupt at circuit, short circuit or when bumping fault such as ground, the state that similar parallel operation is usurped between A, the B line, this device will be made acousto-optic immediately and report to the police, see Table 1, this moment, alarm voice was admitted to circuit, very help telephone office look into repair the circuit personnel on this section circuit with earphone segmentation audiometry, determine the position of fault rapidly.Position 3, battery B still powers, but alarm voice do not bother to see me out into circuit, and this machine owner can carry machine and monitor illegal parallel operation conversation, traces the lawless person.

The used semiconductor device of the utility model circuit, U1 are a slices three and-not gate, model 74HC10; U2, U3 are the two optical couplers of a slice, model TLP521-1; U4 then is a slice double-tone music three terminal device, model VT66D.These devices all can have been bought on market, and are all economic during operation.

Compare with prior art, monitoring alarm of the present utility model has following advantage: 1. multiple functional. Circuit is usurped by parallel operation or is broken down, and can report to the police immediately, and can in time stop and usurp and auxiliary line is looked into the personnel of repairing and found the position of fault; 2. power consumption is very little, and operating cost is cheap; 3. volume is little, and cost is low.

Claims (3)

1, a kind of telephone line fault and illegal parallel operation monitoring alarm, comprise that line status is differentiated link (1) and local state detects link (2), both output is delivered to integrated logic in the lump and is differentiated link (3), start after the differentiation or forbid alarm signal generation link (4) work, described monitoring alarm is characterised in that:

A. line status is differentiated link (1), its output that detects rectifier bridge (11) is connected to the input of dividing potential drop-voltage limiter (12), after dividing potential drop, pressure limiting again through inverter (13) (U1: A) output, and just export " 0 " under the situation only normal, that this machine is hung up again at circuit;

B. local state detects link (2), comprise two the antiparallel Light Coupled Device of input (21) (U2) and (22) (U3), they are connected in this machine talking path, and only carry machine at this machine and use, and among both an output " 0 " are arranged just during the normal or illegal parallel operation of circuit;

C. integrated logic is differentiated link (3), comprise with-not gate (31) (U1: B) and the inverter that output was connected (32) (U1: C), inverter (32) is just exported " 1 " in the time must reporting to the police;

D. alarm signal generation link (4), comprise speech synthesizer (41) (U4) and two transistors (42) (Q1), (43) (Q2), the output of the input termination integrated logic of (41) and (42) differentiation link (3), (41) produce voice signal and amplify (SP) sounding of rear drive loud speaker (44) through (43), simultaneously by transformer (45) (TR) and capacitance (46) (C2) alarm voice is sent into circuit, disturb illegal parallel operation conversation, the emitter current of (42) is lighted light-emitting diode (47) (LED).

2, according to described telephone line fault of claim 1 and illegal parallel operation monitoring alarm, it is characterized in that: line status is differentiated the detection rectifier bridge (11) of link (1), and connect after the button AN cross-over connection between telephone wire A, B, as long as click AN, can end illegal parallel operation and use.

3, according to described telephone line fault of claim 1 and illegal parallel operation monitoring alarm, it is characterized in that: double-pole multithrow switch K is set does the function of use selection for the user, the moving contact of K-1 meets A(a) line, an one fixed contact connects transformer TR one end; The moving contact out-put supply of K-2 meets VCC, and two fixed contact also connects battery B anode.