RU2007888C1 - Device for connection of several phone users to one communication line - Google Patents

Abstract

FIELD: devices for automatic phone communications. SUBSTANCE: device has dial ring receiver 1, first and second delay units 2 and 3, control unit 4, units 5 and 6 for locking first and second users, first, second and third relays 12, 7 and 9, first, second and third capacitors 11, 8 and 10, polarized relay 14, first, second and third diodes 16, 17 and 18. EFFECT: simplified design and increased reliability. 2 cl, 2 dwg

Description

 The invention relates to techniques for automatic telephone communications and is used to connect to an existing telephone line of an additional subscriber unit without affecting the technical means of the telephone exchange. Moreover, the line operates on the principle of paired subscribers.

 The device can be used in any PBX networks using an induction call signal.

 Known devices for turning on telephone subscribers in a paired circuit, made on semiconductor or gas-discharge devices, for example, UB-5, DTP-1, DRP, and other types of blockers.

 The disadvantage of these devices is that for their operation on the PBX must be installed special stationary equipment.

 Also known are devices for connecting telephone subscribers to a subscriber line, comprising line status analyzers and a control unit.

 Their disadvantages are significant complexity and a long time for connecting subscribers.

 The closest in technical essence to the proposed technical solution is a device for connecting telephone subscribers to one subscriber line.

 This device allows for a simple call algorithm to ensure the operation of the telephone line on the principle of paired subscribers without installing special equipment on the PBX.

 The disadvantages of the device are the significant complexity of the functional connections, the presence of a large number of microcircuits, the need to use a local power source, which together reduces the reliability and increases the cost of the device.

 The purpose of the invention is to simplify the device and increase the reliability of its operation.

 This goal is achieved by the fact that in the known device for connecting telephone subscribers to one subscriber line containing an inductor call receiver, the input of which is connected to the line, and the output is connected to the first input of the control unit, to which the first and second delay units are connected, as well as the unit blocking the first subscriber and blocking the second subscriber, the analyzer of the state of the line of the first subscriber and the analyzer of the state of the line of the second subscriber, the blocking block of the first subscriber is included in the line of the first subscriber and connected to the line state analyzer of the first subscriber, which is connected to the first control output of the control unit, and the second subscriber blocking unit is included in the line of the second subscriber, and connected to the line state analyzer of the second subscriber, which is connected to the second control output of the control unit, wherein the control unit comprises the first capacitor is connected in series, one output of which serves as the first input of the control unit, and the winding of the first relay connected by a free output to the common device wire a, a polarized relay, the first and second windings of which are the second and third inputs of the control unit, respectively, and their free terminals are connected to the device’s common wire, as well as the first diode connected in series, the anode of which is the fourth input of the control unit connected to the subscriber line, and parallel to which the breaking contact of the first relay is connected, according to the switched on second diode, the first terminal of which is connected to the first terminal according to the switched on second diode and the switching contact of the field of the relay, the other contacts of which are connected to the second terminals of the second and third diodes, respectively, and are respectively the first and second control outputs of the control unit, and the line state analyzers of the first and second subscribers are made in the form of windings of the second and third relays, in parallel, the second and third capacitors, and blocking blocks of the first and second subscribers are made in the form of opening contacts of the third and second relays, respectively.

 In addition, the blocking blocks of the first and second subscribers can be combined with the corresponding line status analyzers and made in the form of dynistors, shunted by bias diodes.

 In FIG. 1 shows the electrical structural diagram of the proposed device; in FIG. 2 is a block diagram of an embodiment of a device using dynistors in blocking units.

 A device for connecting telephone subscribers to one subscriber line comprises an inductor call receiver 1, a first delay unit 2, a second delay unit 3, a control unit 4, blocking units 5 and 6, a first subscriber line state analyzer comprising a relay 7 and a capacitor 8, an analyzer the state of the line of the second subscriber, containing the relay 9 and the capacitor 10.

 The control unit contains a capacitor 11, a first relay 12 with NC contacts 13, a polarized relay 14 with switching contacts 15, the first 16, second 17 and third 18 diodes.

 To call subscribers whose phones are connected to the proposed device, the following algorithm is used.

 1. The first subscriber is called in the usual way: they dial a number and wait for a response.

 2. To call the second subscriber, the number is dialed twice (double call): they dial the number, wait for the first signal “control the call”, then you should end the call, that is, hang up the telephone or press the lever switch. After a few seconds, a second call is made by dialing the same number and waiting for the response of the second subscriber.

 The device operates as follows.

 When you call one of the subscribers, the inductor call signal from the subscriber line is fed to the input of the inductor call receiver 1, where it is converted to a DC voltage. This voltage is supplied to the first 2 and second 3 delay blocks and charges their timing circuits, as well as storage capacitors.

 After the specified delay time, the voltage from the storage capacitors (outputs of the delay units) are fed to the windings of the bi-stable polarized relay 14 of the control unit and its contacts 15 are switched.

 A constant voltage from the output of the receiver 1 of the inductor call also arrives at the first input of the control unit, charging the capacitor 11. The charge current of this capacitor flows through the coil of the relay 12, causing the contacts 13. 13. The diode 16 is unlocked and the sinusoidal signal supplied to the fourth input of the control unit the call is detected and through the contacts of the relay 15, diode 18, the elements of the line analyzers 7,8,9,10, blocking blocks 5 and 6 are received simultaneously on the telephones of both subscribers, which are connected to waters "AB1" and "AB2" device.

 Since the call signal is converted to unipolar (detected), the induction bell mechanism of both telephones does not work.

 Thus, the device uses the principle of blocking the ringing mechanism of telephone sets by detecting a call signal using a diode.

 The charge time of the capacitor 11, and hence the retention time of the relay 12, is selected somewhat longer than the duration of one call signal (approximately 4 s), which ensures reliable locking of telephones during the first call signal sending.

 When the first subscriber is called after a pause (about 3 s), the second call signal is sent, which triggers the ringing mechanism of the telephone connected to the device output “ab1”, since the diodes 16 and 17 are blocked by contacts 13 and 15. Relay 14 saves the initial state, since the time constant of the delay unit 2 is selected 1.5-2 times longer than the pause between the call signal packages, and each subsequent package recharges the timing chains of the delay units 2 and 3 with voltage, yuschim with inductor call receiver.

 The telephone of the second subscriber at this time is still blocked due to the detection of a ringing signal by diode 18.

 When the second subscriber is called after the first sending of the call signal, the connection is interrupted by the caller. The repeated call signal arrives after a time exceeding the time constant of the delay unit 2, i.e., after the caller repeats the dialing. During this time, the voltage from the output of the first delay unit 2 is supplied to the coil of the relay 14 and switches its contacts 15. In this case, the diode 17 is unlocked, and the diode 18 is locked.

 Thus, sending a callback signal triggers the ringing mechanism of the telephone connected to the terminal "ab2" of the device, and the telephone of the first subscriber is blocked.

 The second block 3 of the delay is necessary to switch the contacts 15 of the relay 14 to its original state after 1-2 minutes after the termination of the call. The specified delay time is determined by the parameters of the timing circuit of the delay unit 3. It is selected from those considerations that when calling the second subscriber, the caller is guaranteed to have time to redial the number.

 When one of the subscribers picks up the handset, the telephone of the other subscriber is blocked (disconnected from the line). This function is performed by blocking blocks 5 and 6 and line state analyzers on elements 7.8 and 9.10. In the circuit of FIG. 1, blocking blocks 5 and 6 are normally closed contacts of single-stable relays, and line status analyzers are the windings of these relays 7 and 9, shunted by capacitors 8 and 10.

 For example, when the telephone receiver of the device connected to terminal “ab1” is removed, the direct current of the station battery flows through contacts 13 and 15 (diode 17), relay coil 7. Contacts 6 of this relay open, and the telephone of the second subscriber is disconnected from the line.

 Similarly, the telephone of the first subscriber is blocked when the telephone handset of the device is connected to terminal “ab2” of the device. When this current flows through the diode 18 and the relay coil 9, causing the operation of contacts 5.

 Capacitors 8 and 10 reduce the voltage drop across the relay windings 5 and 6 during a conversation and a call.

 To quickly return the device to its initial state, relays 7 and 9 can have additional normally open contacts, through which, when one of the telephone handset is removed, the line voltage is supplied to the relay coil 14 and switches it to its initial state.

 In the circuit of FIG. 2, the role of line condition analyzers and blocking units is performed by dynistors 5 and 6, shunted by reverse-biased diodes 7 and 8. In this case, blocking of one of the telephone subscribers is ensured by reducing the voltage in the line when the dynistor is turned on, i.e. when one of the telephone handset is removed , the second dinistor can no longer turn on.

 Thus, the proposed circuit solution of the device for connecting subscribers to one subscriber line allows to simplify it as much as possible and increase the reliability of operation.

 The advantage of the proposed device is also that for its operation does not require an additional local power source.

 (56) Copyright certificate of the USSR N 1354440, cl. H 04 M 9/00, 1987.

Claims (2)

 1. DEVICE FOR CONNECTING TELEPHONE SUBSCRIBERS TO ONE SUBSCRIBER LINE, comprising an inductor call receiver, the input of which is connected to the first input of the control unit, to which the first and second delay elements are connected, as well as the block of the first subscriber block and the block of the second subscriber, line status analyzer the first subscriber and the analyzer of the state of the line of the second subscriber, characterized in that the block blocking the line of the first subscriber is included in the line of the first subscriber and connected to the analyzer of the state of the line the second subscriber, which is connected to the first control output of the control unit, and the block block of the second subscriber is included in the line of the second subscriber and connected to the line state analyzer of the second subscriber, which is connected to the second control input of the control unit, while the control unit contains a series-connected capacitor, a winding the first relay and the first winding of a polarized relay, the second winding of which is connected to the first output of the first winding, as well as the first diode connected in series, in parallel which ohm, the opening contact of the first relay is turned on, according to the switched on second diode, the first terminal of which is connected to the first terminal according to the switched on second diode and the switching contact of the polarized relay, the other contacts of which are connected to the second terminals of the second and third diodes respectively and are the first and second control outputs of the unit control, and the line state analyzers of the first and second subscribers are made in the form of windings of the second and third relays, respectively, parallel to which the second and third capacitors are switched off, and the blocking blocks of the first and second subscribers are made in the form of disconnecting contacts of the third and second relays, respectively.  2. The device according to p. 1, characterized in that the blocking blocks of the first and second subscribers are combined with the corresponding line state analyzers and made in the form of dynistors, shunted by reverse biased diodes.

Images