Introduction
Currently widespread automatic determinants of number (AON), collected at different element base (KR580VM80A, Z80, 1816BE49, sets rigid logic K155, C, etc.). All of these systems focus on determining the caller according to the information sent by the station in response to a request frequency of 500 Hz - 2.5 kHz in bitonal code "2 of 6" code frequencies 700, 900, 1100, 1300, 1500 and 1700 Hz with deviations of the signals of no more than 15 Hz and a duration of 32 MS. The device, described below, allows you to "dazzle" such system identification.
Technical description
1. Functions and capabilities
Protection system determine the telephone number allows on the basis modern electronic technology to realize the possibilities for protection from the definition Your phone number when contacting the subscriber, who set system caller ID type "Lobe". This system can be used as built-in telephone and separate consoles to a telephone.
1. 1. Functionality
Protection system the telephone number of the (anti-ANI) provides protect Your room from the definition of the caller using caller ID systems any type.
2. Specifications
Technical characteristics of the telephone equipped with anti-Aonom, can be divided into two groups. The first group will include features, inherent in the telephone apparatus (electro-acoustic parameters). These features fully determined by the underlying machine.
Second group characteristics are determined by the specific function performed by this system. It should be noted that for this function the system imposes much more stringent requirements on the telephone line and satisfactorily can only work with phone lines, features which meet the standards.
A description of the various nodes
From the analysis of the concept of the protection system from determining the number visible, this system is based on three logical elements 4I. The basis is an oscillator, tuned to a frequency 12.626262 Hz.
Second functional node is amplifying cascade, assembled on the transistor 2N2904, amplifying the clock pulses necessary for the operation the third functional unit - the Executive part.
The Executive part is a relay type RASA, passport RS4.569.724.
The principle of operation of the protection system from the telephone number of the
The operation of the system of protection based on the effects on the receive path information systems caller ID, avoiding the locking of the vocal tract of the calling subscribers and the inability to transfer it to any digital or analog signals in the transmission of information about its number. This is accomplished by passing on the station unpitched information through circuit lines with a frequency 12.626262 Hz.
Instruction manual
1. Hardware implementation
Structurally, the protection system is designed as a separate module, filled epoxy for protection of electronic components from external influences.
2. Brief description of work
With proper inclusion of anti-Aona and clicking the button You will hear typical quiet rhythmic crackling with a frequency of about 13 Hz, indicating normal operation of the device. Release the button and raised the receiver of the telephone in the tube, you should hear a long beep; when no need to press the PTT: when you click in the tube should heard a crackling sound with a frequency of about 13 Hz is pretty high volume.
The above conditions indicate the proper and normal operation in the device.
When the middlebox following action: dialed a number and after connection of the line button is pressed anti-Aona and lasts approximately 10 to 60 seconds; if after releasing the buttons in the handset heard that the station starts to send Your caller tone the parcel, it is necessary for some time to press the button.
3. Instruction manual
There is a widespread view that properly collected digital system debugging requires and begins to work immediately; however, if the scheme at least one of a failure, the task of searching and locating it becomes practically insoluble without the use of specialized systems.
Setting starts with inspection of the values of the supply voltage, which must be in ranging from 4.9 to 5.3 Volts. Then it is necessary to achieve frequency setpoint generator, assembled logic elements DD1.1, DD1.2, DD2.1, condenser C1, the resistor R1 is equal to ~12.626262 Hz. There may be some deviations from the specified frequency, but is not guaranteed under the foregoing parameters. After that, connect the transistor VT1, a resistor R2 that is used to more stable operation of the relay, and the relay K1 and check the operation of the entire device in General: pressing the button should cause the actuation of the relay, with an estimated frequency 12.626262 Hz. (All tested empirically. Looking for a friend Aonom keep calling him, adjusting P1, achieving blinding him Aona.)
Specification details and their possible replacement.
Schematic diagram
The relay contacts are set as shown in the diagram on the circuit, on the opening is not plow.
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