RU2429583C2 - Method of connecting shared service line subscribers to automatic telephone station and interlocking device for realising said method - Google Patents

Abstract

FIELD: information technology.

SUBSTANCE: shared service line subscribers are connected to an automatic telephone station (ATS) through an interlocking device. A DC voltage signal is sent over a communication line from the ATS to the interlocking device before the DC signal or a variable voltage signal appears on the line, which indicates the line being occupied by one of the subscribers. The interlocking device identifies the busy line while simultaneously blocking the line which is not busy and then transmitting information on the busy line to the automatic telephone station. The busy line is identified by successively switching off subscribers from the communication line.

EFFECT: possibility of separating and identifying shared service line subscribers by a telephone station, reduced noise in the telephone line when connecting shared lines and avoiding erroneous connection of a subscriber by enabling detection of an active subscriber using the interlocking device.

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Description

The group of inventions relates to methods and means of telephone communication, in particular to interconnection devices that use a separate line for each pair of subscribers. The inventive group of technical solutions can be used to organize the separation of paired subscribers in modern digital automatic telephone exchanges (ATS) with analog lines.

Known methods for connecting two subscribers to the same telephone line through the blocker, in which at the telephone exchange for the separation of subscribers formed a periodic change in the polarity of the voltage on the telephone line, and the subscribers installed polar-sensitive separation device. Such subscribers are called paired, and the separation device is called a blocker. Depending on the polarity, the blocker alternately connects the subscribers to the line of the automatic telephone exchange (PBX) until a current appears in the line, after which the PBX fixes the polarity of the wires. Caller ID is determined by the polarity on the output wires of the telephone exchange. Periodic polarity reversal in the communication line with the telephone exchange creates interference in the communication line.

There is a method of connecting a paired subscriber to a telephone line, in the implementation of which the connection is made only during the recession of the positive half-wave of the ringing signal of the telephone line to zero, and a device for its implementation, containing the first diode, the anode and cathode of which are connected respectively to the first input and the first the output of the device, and a discharge unit, the first input of which is connected to the cathode of the first isolation diode, and the output is the second output of the device, while the second input is trinity is connected with the second input of the discharge block or with the cathode of the second separation diode, the anode of which is connected to the second input of the discharge block, while the third input of the discharge block is connected to the anode of the first separation diode (see patent for invention RU No. 2110899, IPC Н04М 9/04 publ. 1998.05.10).

To provide telephone communications, in addition to installing known devices for subscribers, it is necessary to use stationary pairing devices on the telephone exchange. These devices carry out continuous polling of subscribers by changing the line polarity with a frequency of 0.5-1.0 Hz, as well as setting the polarity that provides power to the telephone line that has taken the line.

Most modern digital telephone exchanges with analog lines do not work with paired phones. In addition, a periodic change in polarity leads to interference in the line, which does not allow the use of lines for connecting broadband access systems (ADSL) and fire and security alarms with information transfer in the natal frequency range.

Known subscriber isolation device containing a first resistor and a transistor, the emitter of which is connected to the anode of the first diode and is the first output of the subscription separation device. The first and second inputs of the subscriber isolation device are, respectively, the cathode of the first diode and the anode of the second diode. The device also contains a second and third resistors, a capacitor, a zener diode, the cathode of which is connected to the cathode of the second diode, and the anode to the first output of the second resistor. The second terminal of the second resistor is connected to the first terminal of the capacitor and through the first resistor to the first terminal of the third resistor and the base of the transistor. The emitter of the transistor is connected to the second terminals of the third resistor and capacitor, and the collector to the cathode of the first diode, while the anode of the second diode is the second output of the subscriber isolation device (see ed. Certificate No. SU 1497760, IPC Н04М 9/04, published 1989.07.07 .thirty).

When using a well-known technical solution, each of the two paired subscribers is connected through the appropriate device, which contributes to erroneous or spontaneous connection to another line.

A subscriber isolation device is known that comprises a first semiconductor switch and a first diode connected in parallel with a cathode connected to a first input terminal and an anode to a first output terminal. The device also contains a first control unit, which is connected to a second input terminal through a first threshold element made on the basis of a zener diode, a second output terminal to a first output terminal, and a third terminal to a control terminal of a first semiconductor switch. A second semiconductor key and a second diode are connected in parallel, an anode connected to the second input terminal, a second control unit of the second semiconductor key connected by the first and second terminals between the first threshold element and the second input terminal, and the third terminal connected to the control terminal of the second semiconductor key . The subscriber isolation device contains a constant voltage source, a switch and a second threshold element made on the basis of a zener diode, while the constant voltage source is connected to the second output terminal by the first + terminal, the second - terminal is connected to the first terminal of the switch, and the third terminal is connected to the first output terminal, the switch is connected with the second output terminal to the second output terminal, the third output to the cathode of the second diode, the fourth output through the second threshold element to the first output terminal (see patent for half a meter od RU No. 4030, IPC Н04М 9/04, publ. 1997.04.16).

The main disadvantage of the known device is the need to provide additional power.

The task to which the claimed group of technical solutions is directed is to provide the possibility of paired telephone lines to work with modern digital telephone exchanges, as well as connecting broadband access systems.

The technical result achieved by using the claimed group of inventions is to provide the possibility of separation and identification of paired subscribers with an automatic telephone exchange, as well as to reduce interference in the telephone line when connecting paired phones and eliminating the possibility of erroneous connection of the subscriber due to the possibility of determining the active subscriber through the blocker .

The problem is solved in that the method for connecting paired subscribers to an automatic telephone exchange through a blocker according to the technical solution includes testing a constant voltage signal sent through a communication line from an automatic telephone exchange to the blocker and paired subscribers until a DC signal or a signal in the form of a voltage change occurs line, determining the occupation of the communication line by one of the paired subscribers, the registration of this signal by an automatic telephone exchange and by the locator, after which the blocker identifies the busy line by the presence of a direct current signal or voltage change in one of the communication lines between the blocker and the subscribers, while blocking another unoccupied communication line and then transmitting information about the busy line to the automatic telephone exchange. The busy line is identified by successive disconnections of subscribers from the communication line. The problem is also solved by the fact that the method of connecting paired subscribers to an automatic telephone exchange through a blocker includes testing with a constant voltage signal sent through the communication line from the automatic telephone exchange to the blocker and paired subscribers until a constant current signal or signal appears in the form of a voltage change on the line determining occupation of a communication line by one of the paired subscribers, registration of this signal by an automatic telephone exchange and a blocker, after which sequentially disable subscribers paired test signal changing polarity for identifying occupied communication line subscriber with simultaneous blocking of the other lines are not busy. The blocking device, including a switching unit, configured to break the communication line of any of the paired subscribers, the signal receiving unit from the automatic telephone exchange and the control unit, according to the technical solution, contains at least one current or voltage sensor. The blocking device may include a signal transmission unit to an automatic telephone exchange. An element with optical signal transmission (optotransistor) can be used as a current sensor, and an electromagnetic relay can be used as a switching unit. Transistors can be used as signal reception and transmission units, and a microprocessor as a control unit.

The group of inventions is illustrated by a block diagram (see drawing), in which the following positions are indicated:

1 - communication line from the exchange;

2, 3 - tube raising sensors;

4 - switching unit;

5 - control unit;

6 - block receiving tone;

7 - block transmit tone;

8, 9 - subscriber line.

The use of paired telephones was caused by the insufficient number and high cost of subscriber lines and made it possible to connect additional subscribers to the telephone exchange. However, the need to equip both the PBX and the connected subscribers with special additional devices negatively affected the consumer qualities of paired telephones. The inventive device is designed to provide telephone communications paired telephones without complicating the equipment on the PBX. The inventive subscriber separation device for paired telephones (blocker) is a node of electrically connected elements containing at least one, and often two current or voltage sensors, which are elements that fix the pickup of one of the subscribers, i.e. pickup sensors 2 and 3, switching unit 4, control unit 5, and tone signal receiving and transmitting units 6. From a standard telephone exchange (including digital) to a separation device, one twisted pair of wires is suitable - an input communication line 1, which provides communication between two subscribers with different phone numbers. Two wires are connected to each of the wires of communication line 1, dividing it into two subscriber lines 7 and 8. A device 6 is connected to communication line 1, which is capable of analog-to-digital signal conversion and is designed to receive or transmit a tone signal. Device 6 can be implemented on operational amplifiers or on a transistor key with pulse-width modulation. Prior to dividing communication line 1 from the PBX into two subscriber lines 7 and 8, it is possible to connect a broadband access system (ADSL modem) and a fire alarm with information transfer in the natal frequency range. On subscriber lines 7 and 8, tube pickup sensors 2 and 3 are installed, respectively, which are, for example, a transistor, an electromagnetic sensor or a Hall sensor, that is, any sensor at the output of which it is possible to register a signal when an electric current passes through it. Between the pick-up sensors 2 and 3 and telephones (not shown) on the subscriber lines, a switching device 4 is connected, which is a relay, for example, an electromechanical, electromagnetic or optocoupler. The pick-up sensors 2 and 3, the switching device 4 and the receiving-transmitting device for the tone signal 6 are connected to the control device 5, made on the basis of a microprocessor.

The inventive method is as follows.

In standby mode, a constant voltage is supplied from the automatic telephone exchange to a line equipped with a blocking device, thereby testing the line with a constant voltage signal, while both paired subscribers are connected to the station. One of the subscribers of the line activation indicator is a direct current response signal or a signal in the form of a change in the direct voltage in the line depending on the type of sensor (current or voltage, respectively) that the blocking device is equipped with. Thus, line testing is carried out until a response signal is received. After the appearance of the signal, it is registered at the automatic telephone exchange and at the blocking device. The registered signal can be identified by a blocking device or directly by an automatic telephone exchange as follows. The blocker determines the presence of current or voltage in one of the communication lines between the blocker and the subscribers, alternately disconnecting the subscribers from the line. An automatic telephone exchange detects the presence of current or voltage by sequentially disconnecting paired subscribers by changing the polarity of the test signal. The signal of the connected subscriber is a line current or voltage change. When identifying a subscriber, the blocker simultaneously disconnects the paired one until the signal that the line is free appears.

The inventive device operates as follows. In the initial state, a constant voltage is applied to the input of the subscriber separation device from the PBX via communication line 1, distributed across both subscriber lines 7 and 8 through the tube pickup sensors 2 and 3, respectively, and the switching device 4 to the telephone sets. When you pick up the handset by one subscriber, for example, on line 7, the pick-up sensor 2 of the tube is activated, the output of which is connected to the control device 5. The control device 5 sends a signal to the switching device 4, breaking the subscriber line 8 and disconnecting the second subscriber from communication line 1. The control device 5 also directs the signal to the tone transmitting and receiving device 6, transmitting information about the subscriber who picked up the telephone to communication line 1. Thus, the subscriber separation device of paired phones independently, without the participation of the PBX, determines and reports the PBX information about which of the subscribers picked up the phone. When an incoming phone call to the subscriber, for example, on line 7, the PBX generates a tone, which the device 6 receives and receives a tone. The associated control device 5 sends a signal to the switching device 4, disconnecting the subscriber line 8. The call passes only to the subscriber on line 7.

An example of a specific implementation.

A subscriber separation device (blocker) is used to connect paired telephones to a digital telephone exchange of the ALS series (via an analog communication line), which ensures joint operation with a broadband access system. The 3OT110A optotransistor was used as a tube raising sensor, an electromagnetic polarized relay as a switch, an AT tiny 84 microprocessor as a control device, and a transistor connected to the microprocessor terminals as a tone dialing device.

Claims (3)

1. A method for connecting paired subscribers to an automatic telephone exchange through a blocker, including testing with a constant voltage signal sent through the communication line from the automatic telephone exchange to the blocker, and paired subscribers until a direct current signal or signal appears in the form of a voltage change on the line that determines line occupancy communication by one of the paired subscribers, registration of this signal by an automatic telephone exchange and a blocker, after which the blocker identifies the busy NIJ by the presence of a DC signal or the voltage change in one of the communication lines between the blocker and subscribers with simultaneous blocking of the other unoccupied lines and subsequent transmission of information about the busy line to the automatic telephone exchange. 2. The method according to claim 1, characterized in that the identification of the busy line is carried out by successive disconnections of subscribers from the communication line. 3. A method for connecting paired subscribers to an automatic telephone exchange through a blocker, including testing with a constant voltage signal sent through the communication line from the automatic telephone exchange to the blocker, and paired subscribers until a direct current signal or signal appears in the form of a voltage change on the line that determines line occupancy communication with one of the paired subscribers, registration of this signal by an automatic telephone exchange and a blocker, after which a sequential shutdown is performed pairing of subscribers by changing the polarity of the test signal to identify a busy subscriber line while blocking another unoccupied line.