SU1338108A1 - Device for checking userъs lines - Google Patents

Abstract

The invention can be used to control subscriber lines (ALs) for breaks and insulation resistance, and provides enhanced functionality by monitoring both two-wire and four-wire ALs. Device Contains switching unit 1, control unit 2, consisting of a constant voltage divider 3, variable threshold voltage divider 4, an operational amplifier (OU) 5 and element 6, control unit 7. an occupancy signal receiving unit 8, a signaling unit 9, resistors 10, as well as subscriber units 11 and station1 object 12. The signal of block 7 in switching unit 1 alternately connects groups of wires unoccupied AL to control to block 2. Using OA 5, the conductor of the line is monitored for ground insulation resistance. When the total resistance of the AL circuit, determined by the value of resistor 10 in subscriber unit 11, or line break, is increased, as well as when the insulation resistance of the wire decreases, the input voltage decreases relative to the voltage of the shelter 5. When the AL fault from block 2 is received, a signal is sent to the unit 9, in which it lights up acc. This AL LED. When AL is busy, blocks 8, 7 block 1, 9 blocks. 1 Cp f-ly, 2 ill. & (L wb / jfo tfVCP

Description

The invention relates to instrumentation technology and can be used to monitor subscriber lines for open and insulation resistance.

The purpose of the invention is to expand the functionality of the device by monitoring both two-wire and four-wire subscriber lines.

FIG. 1 shows an electrical block diagram of a device for a control subscriber line; in fig. 2 is an electrical block diagram of the control unit.

The device (Fig. 1) contains a switching unit 1, a control unit 2, used as a constant voltage divider 3, a variable voltage divider A, an operational amplifier 5 and an AND 6 element, a control unit 7, a block 8 for a busy signal , signaling unit 9 and resistor 10. In addition, in FIG. 1 shows subscriber units 11, -11 p h station facility 1

The control unit 7 (FIG. 2) comprises a master oscillator 13, a frequency divider 1 and a decoder 15,

Assistance works as follows.

An automatic check of unused subscriber lines is performed sequentially. When the device is switched on from block 7 for a specified period of time (depending on the monitored parameters), a control signal is received in block 1, as a result of which the first group (four or two) of the subscriber line is disconnected and its connection to to block 2. In this case, with the help of an operational amplifier 5, the control of the wires of the line against the insulation resistance relative to earth is provided. When the total resistance of the subscriber line, defined by the value of resistor 10 in subscriber units 1l 11 or line breaks, and also in the case of decreasing the insulation resistance of any wire relative to ground, the input voltage is reduced relative to the threshold voltage of the operational amplifier 5, which is installed in advance

depending on the monitored parameters of the line.

But after a short period of time (for example, 1 s) from the control unit 7, control signals are sent to the switching unit 1, where the first group of subscriber line remote control lines is simultaneously connected to the station object 12 and the second wire group of the next subscriber line is disconnected from the station object 12 for subsequent control. If any subscriber line fails from control unit 2, a signal is issued to turn on unit 9, in which a trigger corresponding to the given subscriber line is triggered and the corresponding alarm LED lights up.

When any subscriber line is busy, for example, when negotiating, the output of station object 12 through block 8 enters block 7 and blocks the signal providing blocking of the control signal in block 1 and blocking the release of information in block 9.

Claims (2)

1. A device for monitoring - subscriber lines, containing a switching unit, station and Jp neural inputs and outputs of which are respectively the inputs and outputs of the subscriber lines with subscriber units and station objects, the resolution output of which is connected to the input of the control unit, the first and second groups of control outputs of which are connected respectively to the group of control inputs of the alarm unit and the switching unit, the information input of the signal unit dinene with the output of the control unit, the gate input of which is connected to the clock output of the control unit, which is 55 extending functionality by monitoring both two-wire and four-wire subscriber lines, each pair of subscriber lines is bridged by a resistor connected to the input or output of the subscriber unit included in the corresponding wired-pair pair, the information input of the busy signal reception unit is the input of the busy signal then the devices, clock inputs are connected to the clock outputs of the control unit, РЫ- the stroke of the measuring signal of the switching unit is connected to the information input of the control unit which is made as a constant voltage divider, variable threshold voltage divider, operational amplifier, the non-inverting input of which is connected to the output of a constant voltage divider, element And, one input of which is connected to the output of the operational amplifier, the other input is a gate input control unit, and the output of the element I is the output of the control unit that inverts the input of the operating gz Editor A. Ogar Compiled by V. Smirnova Tehred I.Popovich Proofreader L. Beskid Order AUe / SS Circulation 638 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Design, k V) 8108 the amplifier is connected to the nghol (m variable divider of the threshold voltage, the inputs of the constant voltage divider and the variable threshold voltage divider are the information input of the xch control unit, 2. A device according to claim 1, characterized in that the control unit is complete in the form of a series-connected master oscillator, frequency divider and decoder, the second input of which is an input; the control unit, the corresponding outputs of the depotfrater are respectively the first and second groups of control outputs of the control unit, the outputs of the frequency divider are the clock outputs of the control unit. 74 Jz G5 srig.2