SU1501304A2 - User telephone line power supply device - Google Patents

Abstract

The invention relates to telephony. The purpose of the invention is to enhance the functionality by allowing the state of the subscriber telephone line to be monitored. The device contains five NPN transistors 1,2,11,12,13, nine resistors 3,4,5,8,9,10,16,17,18, four NPN transistors 6,7,14,15, ringing input 29. The goal is achieved by introducing two Zener diodes 19.20, a capacitor 21, an optocoupler 22, four additional resistors 23-26, additional NPN transistors 27, and a PNP transistor 28. The device allows you to monitor the subscriber's activity state both during call signal sending and in the absence of the latter. 1 il.

Description

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The invention relates to telephony and is additional to aut. St. № 1 164907.

The aim of the invention is to provide paciini functionality by providing the ability to monitor the state of a subscriber telephone line.

The drawing shows a circuit diagram of power devices of a subscriber telephone line.

The subscriber's telephone line power supply device contains the first 1 and second 2 p - n - p transistors, the first 3, second 4 and third 5 resistors first 6 and second 7 n - p - n-transistors, fourth 8, pty 9 and sixth 10 resistors, third 11, fourth 12 and fifth 13 FI - n - p-transistors, third 14 and fourth 15 n - p - n-transistors, seventh 16, eighth 17 and ninth 18 resistors, first 19 and second zener diodes, capacitor 21, optocoupler 22j first 23, second 24, third 25 and fourth 26 additional resistors, additional p - p - n-transistor 27, additional p - n - p trans Side 28, Bxo 29 ringer.

The power device of the subscriber telephone line operates as follows.

When a voltage pulse from a ring generator is applied to the input 29, these pulses pass through transistor 13 and fours of transistors 1, 2, 6, 7 and 11, 12, 14, 15 are alternately opened, connecting points L and. circuits, to the conclusions of the power source. The voltage at points A and B varies with respect to: the frequency with the frequency of the ringing signal generator, one noj-firing of this transient voltage, namely negative relative to point B, less than the other by the magnitude of the voltage drop at the zener diode 19. Thus , in alternating voltage between points L and B, a constant component appears, equal in magnitude to half the voltage drop on Zener diode 19. The voltage drop on Zener diode 19 is equal to 0.15 of the magnitude of the span of the ring signal, which practically does not affect on m of the acoustic signal of a telephone call and at the same time

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m enough control over the activity of the subscriber. If the microtelefon tube of the device connected to the subscriber line is on the device, the ringing current flowing between points A and B along the circuit: wire and subscriber line - telephone set - subscriber line wire b - capacitor 21 - does not contain a constant This component is because the ringing circuit of the telephone set contains a coupling capacitor. The capacitor 21 shunts the input of the optocoupler 22 in alternating current, therefore the current through the photodiode of the optocoupler 22 is not enough to unlock the transistor 27. The transistor 28 is also closed, and the high negative G1 potenti at its collector; C1 bilitroi 20 with a stabilization voltage of 3.3 V per hour; searching for an opto-22 input from a voltage drop across the capacitor 21 applied to the optocoupler 22 in the forward direction and caused by the passage of an alternating current ring signal through the capacitor 21. When removed the microtelephon tube due to the closure of an} 1ent line over the direct current by the colloquial scheme of the telephone apparatus in the subscriber difference appears to be a constant component of the current, caused by the presence of the single component in the ring voltage. The constant component current flows from point A to point B along the circuit: point A wire and subscriber line - telephone set - wire L of subscriber line: shea - emitting diode of the optocoupler 22 - zener diode 20 - point B. The current through the photodiode 22 increases; The transistor 27 opens and a current flows through it. Opening the transistor 28. The potential of the transistor 28 is low, which is the subscriber response signal. By this signal, the station control device turns off the transistor 13, the call signal loop is stopped, and the subscriber line power supply device is switched to the microphone power mode, at which transistors 11, 12, 15, 14 are closed, and transistors 1, 2, 6, 7 are open. Microphone supply current flows through the circuit: positive power source - rristor 5 - emitter-collector

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transistor 1 - the wire and the subscriber line - the telephone unit - wire f; subscriber line - optocoupler 22 - zener diode 20 - collector-emit ter transistor 6 - resistor 10 - negative output of the power source. The direct current flowing through the optocoupler 22 keeps the transistors 27 and 2B in an open state, when the subscriber puts down the handset, the direct current circuit is broken, the current through the optocoupler 22 stops, the transistors 27 and 28 are closed and a high negative voltage appears on the collector of the latter in para. Resistors 3, 4, 8, 9, 16, 17, IS, 23, 24, 25, 26 are used to set the operating mode of the corresponding transistors.

Thus, the subscriber line power device allows monitoring the subscriber's activity status both during the ringing tone and in the absence of the latter.

Claims (1)

Formula of Invention The power supply device subscriber telephone line by bus. St. No. 1 164907, characterized in that, in order to expand the functionality of the capabilities by providing control of the state of the subscriber telephone line, the first and second zener diodes, a capacitor, an optocoupler, an additional P - n - p transistor, an additional n - p - p-transistor, the first additional, the second additional, the third additional and the fourth dopol01304 resistors, while the cathode of the first Zener diode is connected to the combined collectors of the first and second p - n - pnp of the resistors, the second output of the fourth resistor and the wire in the subscriber line, the anode of the first Zener diode is connected to the combined collectors of the third and Q fourth n - p - n transistors, the anode of the second Zener diode connected to the combined collectors of the first and second n - p - n transistors, the combined collectors of the third and 15 fourth p - n - p transistors, the second output of the first resistor and the first output a capacitor, the second terminal of which is connected to the wire & the subscriber line and the anode of the emitting diode of the optocoupler, the cathode of which is connected to the cathode of the second Zener diode, the emitter of the additional p - p - n transistor through the second additional resistor is connected to the negative output of the power source, which through the first additional resistor is connected to the base additional teln n - p - n transistor and the anode of the photodiode of the optocoupler, the cathode of which 30 is connected to the positive terminal power supply, which through the third additional resistor is connected to the collector of the additional p - p - n transistor and the base of the additional The main p - n - p transistor whose collector is the information output of the subscriber's telephone line power supply device and through an additional resistor is connected to the negative terminal of the power source, the positive terminal of which is connected to the emitter of the additional p - n - p transistor.