CN2132357Y

CN2132357Y - Single channel carr extension security separator for users in city

Info

Publication number: CN2132357Y
Application number: CN 92231276
Authority: CN
Inventors: 李家玉; 孙德晶
Original assignee: YUNNAN TELECOMMUNICATION EQUIPMENT FACTORY
Current assignee: YUNNAN TELECOMMUNICATION EQUIPMENT FACTORY
Priority date: 1992-08-19
Filing date: 1992-08-19
Publication date: 1993-05-05
Anticipated expiration: 2002-08-19

Abstract

The utility model is suitable to be used in the communications field, relating to a security isolator which prevents local cable subscribers and single-channel carrier extension subscribers from overhearing or secretly phoning on the outline input terminals of carrier extensions. The security isolator is composed of high pass filters, guiding bridges of remote supply power source and constant current sources, and is connected between solid line and the incoming line on the outline input terminal of the carrier extension. The high pass filters in the utility model prevent the audio signals on the solid line from reaching the outline input terminal of the carrier extension. When station sets are bridged on the outline input terminal of the carrier extension, the low internal resistances of station sets make the voltage between terminals (3) and (4) decrease, cutting off the dc circuit, so station sets can not be connected with the switch. Thus, the overhearing and secretly phoning can not be realized. The utility model has the advantage to avoid the dispute between solid line subscribers and carrier extension subscribers.

Description

Single channel carr extension security separator for users in city

The utility model is applicable to the communications field, is the secret isolator that a kind of local user's of preventing single-channel carrier extension subscriber divides face outside line input to beat steathily or tap at carrier wave.

The outside line input of existing local user's single-channel carrier extension set is directly to be connected across on the solid line, the carrier wave extension subscriber is connected across carrier wave extension set outside line input with telephone set, just can on solid line, eavesdrop or telephoning illegally, the telephone charges of beating can directly be remembered on the account of physical subscriber steathily, has caused the dispute between physical subscriber and the carrier wave extension subscriber.

The purpose of this utility model provides a kind of new device, make the carrier wave extension subscriber carrier wave extension set outside line input do not become steathily and eavesdrop less than.

The utility model is made of high pass filter, Remote Power Supply guiding electric bridge and constant-current source, be connected between solid line and the carrier wave extension set outside line input lead-in, be placed in place away from the carrier wave extension set, its (1), (2) terminal are connected with solid line a, b line, and (3), (4) terminal are introduced with carrier wave extension set outside line input and be connected.High pass filter is made of capacitor C 1, C2, C3, C4, C5 and inductance L 1, L4; Remote Power Supply guiding electric bridge is made of crystal diode V1, V2, V3, V4; constant-current source is by resistance R 1, R2, R3, R4, R5, R6; transistor V5, V6, V7; crystal voltage stabilizing didoe V8 and inductance L 2, L3 constitute, and piezo-resistance R7, R8 are over-pressure safety device.The concrete annexation of each element of the utility model is as follows: terminal (1) connects solid line a line or b line, the end of C1, the negative pole end of V1 and the positive terminal of V3, the end of another termination C3 of C1 and 1 end of L1, the end of the 2 termination C2 of L1 and the end of C4, terminal (2) connects solid line b line or a line, the other end of C2, the negative pole end of V2 and the positive terminal of V4,2 ends of another termination L3 of C3, the emitter of V7, terminal (4), the end of R6, "+" end of C5 and the end of R8,2 ends of another termination L2 of C4, the positive terminal of V8,1 end of L4, the other end of R8 and terminal (3), V1, V2, positive terminal and R1, R2, R3, R7, an end and the emitter of V5 be connected, V3, the other end of the negative pole termination R7 of V4 and 1 end of L3, the base stage of another termination V5 of R1 and the emitter of V6, the collector electrode of another termination V5 of R3, the end of the base stage of V6 and R4, the collector electrode of another termination V7 of R4, the base stage of V7 connects the end of R5 and the other end of R6, the negative pole end of another termination V8 of R5, "-" end of the 2 termination C5 of L4.

The new advantage of this practicality is carrier channel and the Remote Power Supply loop that carrier wave extension set operate as normal can be provided, simultaneously, can make the carrier wave extension subscriber not become steathily and eavesdrop, thereby prevent the dispute between physical subscriber and the carrier wave extension subscriber less than physical subscriber at carrier wave extension set outside line input.

Below in conjunction with description of drawings embodiment of the present utility model:

Accompanying drawing 1 is the annexation figure of the utility model and solid line and carrier wave extension set.

Numbering 1 is a structure chart of the present utility model among the figure, and numbering 2 is a low pass filter.

Element C1 in the utility model structure chart, C2, C3, C4 is a CL11-250V-0.1 μ f electric capacity, C5 is the electrochemical capacitor of CD11-160V-10 μ f, R1 is a RTX-0.125w-51 Ω resistance, R2 is RTX-0.125w-3M Ω, R3 is a RTX-0.125w-200K Ω resistance, R4, R5, R6 is a RTX-0.125w-100K Ω resistance, V1, V2, V3, V4 is crystal diode 1N4005, V5, V6 is transistor MPSA42, V7 is transistor MPSA92, and V8 is voltage stabilizing didoe 1N756, and inductance L 1 is 0.56MH, L2, L3, L4 is 3..3MH, R7, R8 is piezo-resistance MYL200.

The operation principle of the utility model embodiment is as follows: (seeing accompanying drawing 1)

The utility model is connected between the lead-in of solid line and carrier wave extension set outside line input, be that terminal (1) connects a line, terminal (2) connects the b line, and terminal (3) is carried the lead-in of wavelength-division machine outside line input terminal (5), and terminal (4) is carried the lead-in of wavelength-division machine outside line input terminal (6).Access of the present utility model does not influence the operate as normal of carrier wave extension set, because of it provides carrier wave path and Remote Power Supply current supply circuit.

1, carrier wave path:

The output level route of carrier wave extension set

Carrier wave extension set outside line input terminal (5) → terminal (3) → C4---C2 → terminal (2) → solid line b line

Carrier wave extension set outside line input terminal (6) → terminal (4) → C3---C1 → terminal (1) → solid line a line

Carrier wave terminal output level route

From solid line a line → terminal (1) → C1 → C3 → terminal (4) → carrier wave extension set outside line input terminal (6)

From solid line b line → terminal (2) → C2 → C4 → terminal (3) → carrier wave extension set outside line input terminal (5)

2, Remote Power Supply current supply circuit:

Next electric power polarity is a positive voltage if terminal (1) receives solid line a line, then its loop:

A line → terminal (1) → V3 → terminal (6) → carrier wave extension set Remote Power Supply receiving circuit → terminal (5) → terminal (3) → L2 → V6 → R1 → V2 → terminal (2) → b line

Next electric power polarity is a negative voltage if terminal (1) receives solid line a line, then its loop:

A line → terminal (1) → V1 → R1 → V6 → L2 → terminal (3) → terminal (5) → carrier wave extension set Remote Power Supply receiving circuit → terminal (6) → terminal (4) L3 → V4 → terminal (2) → b line

The high pass filter that the utility model is made of C1, C2, C3, C4, C5, L1, L4 to the attenuation 〉=65dB of audio frequency, makes the solid line audio signal not arrive carrier wave extension set outside line input, so just eavesdrop the phone less than physical subscriber.

The utility model can prevent that the carrier wave extension subscriber from beating words steathily at carrier wave extension set outside line input, and its principle is as follows:

When the carrier wave extension subscriber is connected across carrier wave extension set outside line input with phone, because of the transmitter internal resistance lower, about 300 ohm, cause (3), (4) voltage between the terminal drop to＜4.0 volts, voltage stabilizing at this moment two pipe V8 are because to add the voltage at its two ends low, do not reach puncture voltage and end, V8 ends, cut off the bias current loop of V7, V7 ends, and has cut off the bias current loop of V6 again, V6 ends, at this moment cut off the DC loop of power supply, almost nil by the electric current of phone, phone does not account for switch, get machine moment when phone simultaneously, the electric current that V5 has placed restrictions on phone rises, and guarantees that V8 ends, and the motor phone of cross-over connection does not just become steathily.R7 in the circuit, R8 are piezo-resistance, prevent thunderbolt, guarantee circuit safety.

Claims

1; the secret isolator of a kind of local user's carrier wave extension set; it is characterized in that secret isolator is by high pass filter; Remote Power Supply guiding electric bridge and constant-current source constitute; be connected between solid line and the carrier wave extension set outside line input lead-in; be placed in place away from the carrier wave extension set; its (1); (2) terminal and solid line a; the b line is connected; (3); (4) terminal and carrier wave extension set outside line input terminal (5); (6) lead-in is connected; high pass filter is by capacitor C 1; C2; C3; C4; C5 and inductance L 1; L4 constitutes; constant-current source is by resistance R 1; R2; R3; R4; R5; R6; transistor V5; V6; V7; voltage stabilizing didoe V8 and inductance L 2; L3 constitutes, piezo-resistance R7; R8 is an over-pressure safety device.Concrete annexation of the present utility model is as follows: terminal (1) connects solid line a line or b line, the end of C1, the negative pole end of V1 and the positive terminal of V3, the end of another termination C3 of C1 and 1 end of L1, the end of the 2 termination C2 of L1 and the end of C4, terminal (2) connects solid line b line or a line, the other end of C2, the negative pole end of V2 and the positive terminal of V4,2 ends of another termination L3 of C3, the emitter of V7, terminal (4), the end of R6, " ten " end of C5 and the end of R8,2 ends of another termination L2 of C4, the positive terminal of V8,1 end of L4, the other end of R8 and terminal (3), V1, V2, positive terminal and R1, R2, R3, R7, an end and the emitter of V5 be connected, V3, the other end of the negative pole termination R7 of V4 and 1 end of L3, the base stage of another termination V5 of R1 and the emitter of V6, the collector electrode of another termination V5 of R3, the end of the base stage of V6 and R4, the collector electrode of another termination V7 of R4, the base stage of V7 connects the end of R5 and the other end of R6, the negative pole end of another termination V8 of R5, "-" end of the 2 termination C5 of L4.