RU1941U1 - DEVICE FOR SEPARATION OF CHAINS OF TWIN PHONES - Google Patents

Abstract

DEVICE FOR SEPARATION OF CHAINS OF PAIRED PHONE EQUIPMENT, containing the first unidirectional key, the input of which is connected to the input of the device for connecting to the line, the first comparator, the non-inverting input of which is connected to the output of the first key, the second key, the outputs of which are the outputs of the device for connecting the telephone set, different the fact that the second key is made with two-input control and is organized according to the And circuit and a second comparator is introduced, the output of which is connected to one of the inputs of the second key, to each the input of which the output of the first comparator is connected, the inverting inputs of the first and second comparators are connected respectively to the positive and negative inputs of the device, and the non-inverting input of the second comparator is connected to the positive input of the device.

Description

DEVICE FOR SEPARATION OF CHAINS OF TWIN PHONES

The proposed utility model relates to the field of telecommunications and can be used in PBX equipment and directly installed in a socket to turn on paired telephones.

Known schemes of diode-transistor consoles for separating the signals of a paired telephone line by their polarity PDT-2 and PDT-3, which are installed in the socket to turn on paired telephones (see E.P. Dubrovsky Handbook of a young telephone operator, M., Higher School, 1992, p. 115-P7, Fig. 101a) The PDT-2 prefix (Fig. 101a) contains two diodes, which are unidirectional first and second keys, one of which is connected in the direct direction, and the other in the opposite direction, respectively, to the positive and negative terminals of the line, and the other ends of the diodes are connected to the transistor used together with the input resistor divider as a comparator. In this case, a transistor with a series-connected limiting resistor form a third key, to the terminals of which a telephone (subscriber) is connected. The diodes alternately receive the positive and negative half-waves of current pulses from the line (polarity reversal voltage 1 G d) to detect the moment of raising the tube by one of the subscribers. When a voltage of positive polarity is received, the first and second unidirectional keys are open, fed to the input of the first telephone set, when a voltage of negative polarity is received, the first and second unidirectional keys are locked, and the voltage IT d is supplied to the second same device connected to the line so that the positive input of the second device is connected to the negative output of the line, and the negative input of the second device is connected to the positive output of the line, and through open the first and second one The keys of the second device are supplied with voltage V l supplied to the input of the second telephone set. In this case, the voltage drop across the transistor created by these current pulses is not enough to open the transistor third key

3 ШШ5: Н04-М 1/70

: H04-M 1/70

I

melts, and with / d 1G П0р the key opens, and the capacity of the telephone

the device is discharged.

The PDT-3 circuit (Fig. 1016), selected for the prototype, differs from the PDT-2 circuit in that it contains two transistors connected according to the composite transistor circuit, which allows to reduce the current consumed from the line in standby mode (handsets of both telephone sets do not removed, and they do not receive a ringing signal.

However, when two diodes are used in both circuits, the attenuation of the spoken signal increases, and due to the use of a threshold element (reference voltage source) formed by a resistor divider, distortion of the shape of the ring signal at the output and a significant decrease in its amplitude occur.

The objective of the utility model is to reduce the attenuation of the spoken signal and preserve the shape and amplitude of the ringing signal at the output of the device.

The solution to this problem is provided by the fact that the device for separating circuits of paired telephones containing the first unidirectional key, the input of which is connected to the input of the device for connecting to the line, the first comparator, the non-inverting input of which is connected to the output of the first key, the second key, the outputs of which are outputs a device for connecting a telephone set, characterized in that the second key is made with two-1 input control and organized according to the scheme And, and introduced a second comparator, the output of which The key to the second one of the inputs to the second input of which is connected to the output of the first comparator inverting inputs of the first and second comparators -Connect wo / tvegstvenno to positive and negative inputs of the device, and a non-inverting input of the second komparatore connected to the positive input of the device.

H & M9№

- C key discharge capacity of the telephone (second key) only during the decline of the half-wave ring signal, while the discharge signal capacity repeats the shape of the input signal.

Since with such a connection scheme of the first comparator it is necessary to block the flow of current through the second key, the second comparator is monitored for the input signal polarity, the inputs are connected to the device input, and the output to the second input of the second key. This allows you to save the shape and amplitude of the ringing signal at the output of the device. Moreover, the use of only one unidirectional key in the circuit reduces the attenuation of the spoken signal.

The proposed utility model is illustrated by drawings, in which Fig. 1 shows a functional diagram corresponding to the circuit diagrams of an analogue and a prototype, respectively shown in Fig. 101a) and b) of the above source, and in Fig. 2, a functional diagram of the proposed device.

In accordance with figure 2, the device contains a first one-directional key I, the input of which is connected to the input of positive line polarity, to which the inverting input of the first comparator 2 and the non-inverting input of the second comparator 3 are connected, and the output of the first key I is connected to the non-inverting input of the first comparator 2 and one of the outputs of the second key 4, one input of which is connected to the output of the first comparator 2, and the other input is the output of the second comparator 3, the inverting input of which and the other output of the second key 4 are denied to the negative input of the device.

The operation of the device is as follows.

PHASE I (standby ;.

When a V polarity reversal signal arrives from the line at the device input, the first key I opens with a positive polarity of this signal and is locked with a negative polarity of the signal.

held locked by first comparator I

and with a negative polarity of the input signal, the second switch H is kept locked by the second comparator, which monitors the polarity of the input signal.

PHASE 2 subscriber pick-up)

At the input of the device, a constant voltage is supplied from the line, which through the open dash key I is supplied to the telephone, at this time, the first comparator 2 supports the second switch 4- in the open state.

PHASE 3 (ringing)

When a ringing signal arrives at the input of the device during an increase in the wave of the ringing signal, the capacity of the telephone apparatus is charged through the first open key I (at this time, the second key 4 is closed). When the wave of this signal decays, the first key I closes, 8 through the second key 4- the discharge current of the telephone device’s capacity flows, completely repeating the input signal forl.

The possibility of implementing this utility model can be explained by the following images. The first key I can be performed on an olT0gp 250 V diode and

t max 1Sh ma The first and second comparators 2 and 3 can be combined with

second key 4 and run on transistors with TGkemaks Ј00 V

and 1 yako 50 ya

In this case, the second key 4 with two-input control and organized;

And according to the circuit And can be realized as a serial connection of two transistor switches.

Claims (1)

DEVICE FOR SEPARATION OF CHAINS OF PAIRED PHONE EQUIPMENT, containing the first unidirectional key, the input of which is connected to the input of the device for connecting to the line, the first comparator, the non-inverting input of which is connected to the output of the first key, the second key, the outputs of which are the outputs of the device for connecting the telephone set, different the fact that the second key is made with two-input control and is organized according to the And circuit and a second comparator is introduced, the output of which is connected to one of the inputs of the second key, to each the input of which the output of the first comparator is connected, the inverting inputs of the first and second comparators are connected respectively to the positive and negative inputs of the device, and the non-inverting input of the second comparator is connected to the positive input of the device.