SU1022331A1 - Device for monitoring subscriber's loop state - Google Patents

Abstract

DEVICE OF CONTROL OF THE CONDITION OF THE SUBSCRIBER LAYER, containing a telephone set connected to the subscriber terminal, ring signal generator, connection unit, shaper of duration of call signals, source of constant voltage, receiver of linear signals and actuator element, different in that, in order to increase the accuracy of control by protecting the actuator from false actuating against currents resulting from the electromagnetic effect of power lines and lightning discharges, into it An additional receiver of linear signals, two sources of reference voltage, a linear transformer, while the subscriber line wires are connected to the primary winding of a linear transformer, to the middle terminals of which are connected a constant voltage source and the first inputs of linear signal receivers, the outputs of the reference voltage sources are connected to the second inputs of the linear signal receivers, the outputs of which are connected to the first and second inputs of the actuating element i, the third input of which is connected to the first m output connecting unit WTO (A swarm and third outputs of which are connected to subscriber schleyfu, and first and second inputs connected respectively to the outputs of oscillator ringing shaper and duration of rings. yu oo oo

Description

The invention relates to telephone communications and can be used to protect against the false triggering of a linear signal receiver.

A device for monitoring the state of the subscriber loop, comprising a Support unit, a control unit, a circuit reading unit, a power poll unit, and a power reader unit 1, is known.

The disadvantage of this device is that if the pickup amplitude of the power lines exceeds a threshold value, then a false positive will occur.

Closest to the present invention is a subscriber loop state monitoring device comprising a telephone set connected to a subscriber loop, a ring signal generator, a connection unit, a ring duration driver, a constant voltage source, a linear signal receiver and an actuator 2.

A disadvantage of the known device is that ringing signals are received by the receiver of linear signals from one of the wires of the subscriber loop, and in the case of a current in the wires of the subscriber loop caused by the electromagnetic influence of power lines or lightning discharges, the actuator may be spurious.

The purpose of the invention is to improve the accuracy of control by protecting against the false actuation of the actuator from currents resulting from the electromagnetic effect of power lines and lightning discharges.

The goal is achieved by the fact that a telephone receiver connected to the subscriber loop, a ring signal generator, a connection unit, a ring wave conditioner, a constant voltage source, a linear signal receiver and an actuator, are added to the subscriber loop state monitoring device. linear signal receiver, two voltage sources, a linear transformer, while the wires of the subscriber loop are connected to the primary winding of the linear trans of an ormator, to the middle terminals of which a DC voltage source and the first inputs of linear signal receivers are connected, the outputs of the reference voltage sources are connected to the second inputs of Linear signal receivers, whose outputs are connected to the first and second executive inputs

element, the third input of which is connected to the first output of the connection unit, the second and third outputs of which are connected to the subscriber loop, and the first and second

the inputs are connected respectively to the outputs of the ringing generator and the driver of the duration of the ringing signals.

FIG. 1 shows a block diagram of the proposed device; in fig. 2 - voltage diagrams for his work.

The device contains subscriber plate 1, telephone 2, linear transformer 3, coupling capacitor 4, limiting resistors 5 and b, source; nik 7 constant voltage, receivers 8 and 9 linear signals, sources 10 and And the reference voltage, the actuator 12, the generator 13 ringing signals, block 14 connection and shaper 15 the duration of the ringing signals, galvanic element 16.

The device works as follows.

The principle of operation of the protection circuit is illustrated by time diagrams (Fig. 2). In the original

; states, i.e. when subscriber line 1 is open, electromagnetic voltage on limiting resistor 6 acts only on voltage Ug, and limiting resistor 5 acts on voltage Ug equal to the voltage of electroplating

0 elements plus induced voltage. Linear signal receivers 8 and 9 are triggered if the induced voltage exceeds the voltage of the sources of the reference voltage 10 and 11, respectively. And in the initial state

5 (with open loop), the operating time of the receivers of the linear signals 8 and 9 does not match (Fig. 2).

When the loop is closed, the voltage on 0 of resistor 6 increases and decreases on resistor 5, as a result of which the response time of the linear signal receivers 8 and 9 will increase and there will be a partial coincidence of the operating time of the linear signal receivers, during which the actuator 12 will operate .

When a ringing signal is sent to the subscriber, the blocking signal is supplied from the connection unit 14 from the connection generator 14 to the actuating element 12.. The use of the proposed protection device makes it possible to increase the reliability of the linear signal receiver, simplifies the operation of the equipment and enables its widespread use in areas with a high level of electromagnetic interference.

Claims (1)

DEVICE FOR MONITORING THE CONDITION OF A SUBSCRIBER CIRCUIT, comprising a telephone set connected to a subscriber loop, a ringing signal generator, a connection unit, a ringing signal generator, a constant voltage source, a linear signal receiver and an actuating element, characterized in that, in order to increase the control accuracy by protection from false actuation of the actuator from currents resulting from the electromagnetic influence of power lines and lightning discharges, an additional receiver of linear signals, two sources of reference voltage, a linear transformer, while the wires of the subscriber loop are connected to the primary winding of the linear transformer, to the middle pins of which are connected a constant voltage source and the first inputs of the receivers of linear signals, the outputs of the voltage sources are connected to the second inputs of linear signal receivers whose outputs are connected to the first and second inputs of the actuator, the third input of which is connected to the first output of the unit a connection, the second and third outputs of which are connected to the subscriber loop, and the first and second inputs are connected respectively to the outputs of the ringing signal generator and ringing signal shaper. Fig!