Anti-AON. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Anti-AON. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Telephony

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Introduction

At present, automatic caller IDs (AON) assembled on various element bases (KR580VM80A, Z80, 1816BE49, hard logic kits K155, K564, etc.) are widely used. All these systems are focused on determining the caller's number from the information sent by the station in response to a request with a frequency of 500 Hz - 2.5 kHz in a two-tone code "2 out of 6" with coding frequencies of 700, 900, 1100, 1300, 1500 and 1700 Hz with signal deviations not more than 15 Hz and duration no more than 32 ms. The device described below makes it possible to "dazzle" such a number identification system.

Technical description

1. Purpose and opportunities

The system of protection against identification of a telephone number allows, on the basis of modern electronic technology, to implement the possibilities of protection against identification of your number when calling a subscriber who has installed Caller ID systems of the Lob type, etc. This system can be used both built into the telephone set and in the form of a separate prefix to the telephone set.

1. 1. Functionality

The system of protection against identification of a telephone number (anti-AON) ensures the protection of your number from identification by the subscriber when using any type of ANI system.

2. Specifications

The technical characteristics of a telephone set equipped with anti-CALL can be divided into two groups. The first group will include the characteristics inherent in this telephone set (electroacoustic parameters). These characteristics are completely determined by the base apparatus used.

The second group of characteristics is determined by the specific function performed by the given system. It should be noted that in order to perform this function, this system imposes significantly more stringent requirements on the telephone channel and can work satisfactorily only with telephone lines whose characteristics comply with the standards.

Description of various nodes

From the analysis of the circuit diagram of the number detection protection system, it can be seen that this system is built on the basis of three logical elements 4u-not. The basis is a master oscillator tuned to a frequency of 12.626262 Hz.

The second functional unit is an amplifying stage assembled on a 2N2904 transistor, which amplifies the clock generator pulses necessary for the operation of the third functional unit - the executive part.

The executive part is a relay type RES64A, passport RS4.569.724.

The principle of operation of the protection system from identifying a telephone number

The operation of the protection system is based on the impact on the information receiving path of caller ID systems, bypassing the blocking of the calling subscriber's voice path and the impossibility of transmitting any digital or analog signals through it during the transmission of information about his number. This is done by transmitting non-tonal information to the station by closing the line with a frequency of 12.626262 Hz.

User's manual

1. Hardware implementation

Structurally, the protection system is made in the form of a separate module, filled with epoxy resin to protect the radio components from external influences.

2. Brief description of work

When the anti-AON is turned on correctly and the button is pressed, you will hear a characteristic quiet rhythmic crackle with a frequency of about 13 Hz, which indicates the normal operation of the device. When the button is released and the handset of the telephone set is lifted, a long beep should be heard in the handset; in its absence, you should press the PTT: when you press the button, a crack should be heard in the handset with a frequency of about 13 Hz of a fairly high volume.

The above conditions indicate the correct and normal operation of the device.

When working directly with anti-caller number, the following actions are performed: the required number is dialed and after the line is connected, the anti-caller number button is pressed and held for approximately 10 to 60 seconds; if, after releasing the button in the handset, you can hear that the station starts sending a tone message to your subscriber, then you should press the button for a while.

3. Instruction manual

There is a popular belief that a properly assembled digital debugging system does not require debugging and starts working immediately; nevertheless, if there is at least one fault in the circuit, the problem of finding and locating it becomes practically unsolvable without the use of specialized systems.

The adjustment begins with checking the supply voltage values, which should be in the range from 4.9 to 5.3 Volts. Then it is necessary to achieve the frequency of the master oscillator, assembled on the logic elements DD1.1, DD1.2, DD2.1, capacitor C1, resistor R1, equal to ~ 12.626262 Hz. Some deviations from the indicated frequency are possible, but compliance with the above parameters is not guaranteed. After that, the transistor VT1, the resistor R2, which serves for more stable operation of the relay, and the relay K1 are connected and the operation of the entire device as a whole is checked: when the button is pressed, the relay should operate with an approximate frequency of 12.626262 Hz. (Everything is checked empirically. Looking for a comrade with AON, you call him, adjusting P1, achieving blinding of his AON.)

Specification of parts and their possible replacement.

Anti-AOH

Schematic diagram

Anti-AON, anti-AON concept

Set the relay contacts as shown in the diagram for closing, for opening - it does not plow.

Publication: cxem.net

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