SU871102A2 - Device for checking subscriber channels - Google Patents

Description

The invention relates to the field of measurement technology and can be used to control subscriber lines for open circuit and resistance; lazy isolation.

Closest to the invention according to ⁵ technical essence is a device for monitoring subscriber lines on the main author. St. No. 720381, comprising a switching unit connected to the inputs of the ko® unit, a control unit, the outputs of which are connected to a control unit and an alarm unit, a busy signal reception unit and a constant voltage source fl

A disadvantage of the known device ^15. Is a limited scope, due to the fact that the device cannot be used to control lines of subscriber units that do not have protection against short-term ringing. Short-term dialing forces the subscriber to respond to a false call signal and proceeds as follows. In the process of checking the subscriber line at the end of the control cycle, the line is completely discharged and when connected back to the station: the wire object of the checked line connects the station’s power supply to the microphone of the subscriber unit. At this moment, the subscriber installation is undermining (calling up).

The purpose of the invention is the expansion of the scope of the device.

This goal is achieved by the fact that in the device for monitoring subscriber lines, containing a switching unit connected to the first, second, and third inputs with the outputs of the station object, the first outputs of the control unit and a constant voltage source, respectively, the first outputs with controlled subscriber lines, the second input via a busy reception unit with a first input

871 1 of the control unit, the third output with the first input of the control unit connected to the first output with the second output of the DC voltage source, the first output with the input of the signaling unit ₅ , the third input with the second output of the control unit, the third output of which is connected to the second input of the unit alarm, a charge unit is introduced, connected by inputs to the corresponding outputs of the control unit, control unit and constant voltage source, and the output with the fourth input of the switching unit.

The drawing shows funktsionats- ₁₅ Naja diagram of the device for monitoring subscriber lines.

The device comprises a switching unit 1, a switching unit 2, a constant voltage source 3, a control unit 4, a control unit 5, an employment signal reception unit 6, an alarm unit 7, and a line charge unit 8.

The device is included in the separation of subscriber lines between the station object 9 and the subscriber units

10.

The device operates as follows.

In the initial state, subscriber lines in transit; : pass through the block ^{, 0} 2 switching, connecting the station object with the subscriber units 10 through the block 1 switch. This ensures the normal passage of the signal between the station object 9 .35 and subscriber units.

Blocks 3, 5, 6, 7 by signals from block 4 sequentially automatically check for unoccupied subscriber lines. When the device is turned on, the device is supplied with a control unit for a predetermined period of time for a switching unit 2, which disconnects the first group of wires of the subscriber 45 line from the station object 9. From the connected constant voltage source 3 through unit 2 switching voltage supplied through one of the “pairs of the first group of wires of the subscriber of the 50th line, ensures that the switching unit 1 is activated and the corresponding one of the subscriber units is switched off for ¹ short time, and by loop, As indicated in the switching unit 1, $ ₅ through the second pair of the first group of wires of the subscriber line, a constant voltage is supplied from the switching unit 2 to the input of the monitoring unit 5. In the absence of a break in the subscriber line wires at the command from the control unit 4, the control unit 5 automatically switches to the control mode of the subscriber line wires for insulation resistance relative to the Earth.

After the set interval has elapsed. time, depending on the controlled value of the insulation resistance, from the charge unit 8, a DC voltage is supplied to the switching unit 2, from where the transmission circuit of the corresponding subscriber unit is recharged to a value equal to the voltage of the station microphone power. After that, the control unit 4 gives signals to the switching unit 2, which simultaneously connects the first group of wires of the subscriber line to the station object 9 and disconnects the second group of wires of the next subscriber line from the station object 9 for their further control. In the event of a malfunction of any subscriber line from the control unit 5, a signal is sent to the unit 7, by switching on the alarm.

When busy any. subscriber line, for example, when negotiating, from the output of the busy signal reception unit 6, a prohibit signal is sent to the control unit 4, which, in turn, does not give a command to disconnect the corresponding group of subscriber line wires for monitoring in the switching unit 2. At the same time, control signals continue to be supplied sequentially from the control unit 4 at predetermined time intervals to the switching unit 2 to disconnect the following unoccupied subscriber lines for checking them.

The introduction of the charge unit 8 eliminates the false ringing signal arising from a voltage surge in a subscriber line that does not have protection against surge voltage drops and therefore control such. subscriber lines, which expands the scope of the device.

Claims (1)

(54) DEVICE FOR MONITORING SUBSCRIBER LINES The invention relates to the field of measuring instrumentation and can be used to control subscriber lines for open and resistance; isolation isolation The closest to the invention to the technical essence is a device for monitoring subscriber lines on the main bus. St. No. 720381, containing a switching unit connected to the inputs of the ko ¬ ® ytation unit, a control unit, the outputs of which are connected to the control unit and the alarm unit, the employment signal receiving unit and the constant voltage source f 1,. The disadvantage of the known device. This is a limited area of application, due to the fact that the devices cannot be used to control lines of subscriber units that do not have protection against short-term paging. A short callback causes the subscriber to respond to a spurious ring tone and proceeds as follows. In the course of testing the subscriber line, at the end of the monitoring cycle, the line is completely discharged and when the tested line is connected back to the station facility, the station circuit is connected to the transmission circuit: microphone power of the subscriber unit. At this moment there is a part-time job (paging) of the subscriber installation. The purpose of the invention is to expand the field of application of the device. The goal is achieved by the fact that the device for monitoring subscriber lines, containing a switching unit connected by the first, second and third inputs to the outputs of the station facility, the first outputs of the control unit and the constant voltage source, respectively, the first outputs with controlled subscriber lines , the second input through the block of reception of occupancy with the first input of the control unit, the third output with the first input of the control unit, soy da1 "one first" output with the second output of the source constant No, the first output is with the input of the SNG unit, the third input with the second HHO | D®m of the control unit, the third output of which is connected to the second input of the smgmalization unit; the charge unit is connected with the connected inputs with the corresponding outputs of the control unit, the control unit and the source constant voltage, and the output - with the fourth input of the switching unit. The drawing shows the functional scheme of the device for monitoring subscriber lines. The device contains a switching unit 1, a switching unit 2, a constant voltage source 3, a control unit 4, a control unit 5, an occupancy signal receiving unit 6, a signaling unit 7 and a line charging unit 8. The device is included in the gap of subscriber lines between the station object 9 and subscriber units. The device operates as follows. In the initial state, subscriber lines are in transit; g passes through the switching unit 2, connecting the station object with the subscriber units 10 through the switching unit 1. In this case, a normal signal flow between the station object 9 and subscriber units is ensured. Blocks 3, 5, 6, 7, according to signals from block 4, sequentially automatically check unused subscriber lines. When turned on, the device. In operation from the control unit 4, for a specified period of time, a control signal is received to the switching unit 2, which disconnects the first group of wires of the subscriber line from the station object 9. From the connected constant-voltage source 3 through the switching unit 2 the voltage supplied by one of the pairs of the first group of wires by the subscriber line Jf provides the switching lock 1 to trip and for a short time the correspondence from the subscriber units 10, and from the loop, In the switching unit 1, through the second pair of the first group of wires of the subscriber line, the DC voltage goes from the commutation unit 2 24 24 | to the input of the control unit 5. If there is no wire break in the subscriber line, on command from control unit 4, the control unit 5 automatically switches to the control mode of the subscriber line wires for insulation resistance relative to the Earth. After a specified period. time, depending on the monitored insulation resistance value, from the charging unit 8, a DC voltage is supplied to the switching unit 2, from which the transmission circuit of the corresponding subscriber unit is charged to a value equal to the station power supply of the microphone. After this control unit 4, it issues signals to switching unit 2, which simultaneously connects the first group of wires of the subscriber line to the station facility 9 and disconnects the second group of wires of the next subscriber line from the station facility 9 for further control. In the event of a malfunction of any subscriber line from control unit 5, a signal is sent to block 7 by activating the alarm. When any. Subscriber line is busy, for example, when negotiating, an inhibitory signal is sent from the output of the busy signal receiving unit 6 to the control unit 4, which, in turn, does not give the command to disable the corresponding group of subscriber line wires to control in block 2 switching. At the same time, from the control unit 4, control signals continue to flow sequentially at specified intervals for the switching unit 2 to turn off the next unused subscriber lines to check them. The introduction of the charge unit 8 allows one to eliminate the spurious call signal resulting from the surge of voltage in the subscriber line, which does not have protection against impulse voltage drops and, therefore, to control such. subscriber lines, which expands the field of application of the device. Claims of Invention A device for controlling subscriber units by aut. St. No. 720381, characterized in that, in order to expand the field of application of the device, a charging unit is inserted in it, soy (Zenniy inputs with the corresponding outputs of the control unit, control unit and constant voltage source, and output with the fourth input of the switching unit 1026 Information guides taken into account during the examination 1. Copyright certificate 720381, CL G 01 R 31/02, 1978 (prototype). f 2 L