SU720381A1 - Device for monitoring customer lines - Google Patents

Description

I

The invention relates to the field of electrical measuring equipment and can be used to monitor subscriber lines for open and insulation resistance.

Devices are known that contain sources of direct voltage of a ring signal, a control unit, a switching unit, and a control mode switch 1.

The closest in technical essence to the invention is a device for controlling subscriber lines, comprising a switching unit, a control unit, an alternating current signal source, a control load unit and switching units 2. However, the control of subscriber lines using these devices requires a considerable amount of time, since connection to controlled lines and switching of control modes are made manually.

The purpose of the invention, the automation of control, is achieved by the fact that in the proposed device comprising a switching unit, the outputs of which are connected to the inputs of the switching unit, the first output of which is connected

with the first input of the control unit, the signaling unit, the input of the switching unit is connected to the output terminals of the subscriber; installations, and the outputs of the switching unit are connected to the output terminals of the stationary object, the sources of constant voltage, blkr udravleshm and Fyuk are entered. signal reception is busy. test. The outputs of a constant voltage, respectively, with the second input of the control unit and one nz inputs of the switching unit, the other input of which is connected through the control unit with the output of the busy signal receiving unit, the input of which is connected to one nz outputs of the switching unit. The outputs of the control unit are connected respectively to the third input of the control unit and the first input of the signaling unit, the second input of which is connected to the output of the control unit.

The drawing shows a block diagram of the device.

The device contains a switching unit I, a switching unit 2, a constant voltage source 3, a control unit 4, a contact unit;

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roll 5, block of reception of the signal of occupancy 6 and block of synchronization 7.

The device works as follows. In the initial state, the subsonic lines are passed through a switching unit 2 by the transistor, the station object 8 is connected to the subscriber units 9 to 9 through the switch unit 1. In this case, a normal signal flow between the object 8 and the subscriber units 9-9 is provided,

The device sequentially automatically checks for unused subscriber numbers. When the device is switched on, control signal 4 is received from the control unit 4 for a specified period of time.

switching unit 2, where the first group of wires of the subscriber line is disconnected from the object 8. From a connected DC source 3 through the switching unit 2, the voltage supplied through one of the pairs of the first group of wires of the subscriber line provides the switching unit 1 to operate. as a result, the corresponding installation (9-9) is disconnected for a short time, and through the puff, formed into the switching unit, through the second pair of the first group of wires of the subscriber line the constant voltage comes from the switching unit and 2 to the input of the control unit 5. If there is no wire break in the subscriber line, the control unit 5 automatically switches to the control mode of the subscriber line wires to the relative resistance of the insulation.

After a predetermined period of time, depending on the monitored insulation resistance value, the control unit 4 receives signals to the switching unit 2, where it simultaneously connects the first group of wires of the subscriber line to the object 8 and disconnects the second group of wires of the connecting subscriber line from the object 8 for their further control. If any subscriber line fails, the control unit 5 sends a signal to the signaling unit 7.

When any subscriber line is busy, for example, when negotiating, from the output of the busy signal receiving unit 6, a suppressive signal is sent to the control unit 4 which transmits a command to disable

The corresponding IpyiHibi wires of the subscriber line are to be monitored in switching unit 2. At the same time, control unit 4 continues to receive control signals to switching unit 2 sequentially at specified intervals for switching off the next unused subscriber lines to check them.

The device allows the operator to be freed from manual manipulations to exercise control and to ensure continuous automatic monitoring of subscriber lines, which reduces the service time of subscriber lines.

Claims (2)

1. Principles of building a low-capacity quasi-electronic telephone exchange. M., SV, 1970, p. 154156. 2. The patent of the Federal Republic of Germany No. 2356018, cl. G 04 M 3/30, 1971. at 7 W