KR100421341B1 - Apparatus for matching local line of exchange - Google Patents

Abstract

The present invention relates to a trunk line matching device of an electronic exchange, and is provided with a direct current (DC) supplied through a tip line and a ring line while being connected to a subscriber line, while maintaining a constant polarity through a bridge diode BR1. A subscriber line holding block for controlling to hold the flow of the subscriber line; Detect incoming signal ring flowing from the tip line to the ring line during ringing provided through the tip line connected to the ground path of the subscriber line and superimposed on any voltage provided through the ring line connected to the subscriber line. Ring detection block; A voice path matching block for lowering the mutual conductance of the AC signal provided through the bridge diode BR1 and designing the voice signal to prevent inductive noise and outputting the voice signal to the voice output terminal; A polarity reversal detection block configured to ground (GND) to maintain the same potential with the power exchanger, and to maintain the insulation between the tip line and the ring line at infinity while applying a direct current (DC) voltage to detect whether the voltage is inverted; It is necessary to ground (GND) to maintain the same potential with the power exchanger, and is provided with an open detection block for detecting the presence of the line by maintaining the insulation between the tip line and the ring line to infinite in the state of applying DC (DC) voltage. Therefore, it provides the same function as the holding method through the existing large-capacity transformer, and the circuit itself is implemented in the hybrid, thereby reducing the cost of device components since a number of peripheral devices are not required.

Description

CO line matching device of electronic exchange {APPARATUS FOR MATCHING LOCAL LINE OF EXCHANGE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber matching device for an electronic switch, and more particularly, to an interface circuit used in the form of an analog relay line, in which a subscriber line and a trunk line matching device are provided to provide a path so that voice band signals are transmitted / received during an exchange.

Typically, a CO line matching circuit consists of an RLC element similar to a typical telephone internal circuit, which includes a subscriber line holding function, a ringing signal detection function, and a voice path (2W / 4W). ) Signal transmission in on-hook state to display caller information through matching function, polarity reversal detection function, line open state detection function and voice signal detection during ringing It is divided into receiving function.

As such, in order to implement a basic function of the CO line matching circuit, a circuit is formed around a large transformer using a large transformer to conceptually adhere to the basic principle, so that the size is very large, and thus there is a great difficulty in using the terminal.

Accordingly, a specific M company is provided in the form of HIC under the name of CIO (Central Office Interface Circuit: COIC), and similar companies are supplied from S company. In other words, M's COIC is developed for a system requiring a circuit and a matching function, and is designed so that a grounded ground (GND) with a potential difference cannot be used for a terminal. In addition, there is no problem in the call quality when there is no ground (GND) potential difference between the two systems, but when there is a slight difference in the ground (GND) potential, there is a phenomenon that the call quality is degraded.

In addition, there are two types of COICs of S company. One type has the same problem as COIC of M company, and the other type uses a method of isolating voice signals by embedding a small transformer. Although this was possible, there was a problem in that the open and polarity detection functions were lost.

Accordingly, the present invention has been made in view of the above-described problems, and its object is to use a small signal transformer to improve the quality of the voice path and to maintain the call quality regardless of the grounding environment. The present invention provides a subscriber matching device for an electronic exchange that provides a path for mutual transmission / reception of signals.

In the present invention for achieving this purpose, the subscriber matching device of the electronic switch is provided with a direct current (DC) supplied through a tip line and a ring line while being connected to the subscriber line. A subscriber line holding block controlling to hold a flow of direct current while maintaining a constant polarity through a bridge diode BR1; Detect incoming signal ring flowing from the tip line to the ring line during ringing provided through the tip line connected to the ground path of the subscriber line and superimposed on any voltage provided through the ring line connected to the subscriber line. Ring detection block; A voice path matching block for lowering the mutual conductance of the AC signal provided through the bridge diode BR1 and designing the voice signal to prevent inductive noise and outputting the voice signal to the voice output terminal; The ground should be grounded to maintain the same potential with the power exchanger.The polarity that detects the inversion of the voltage by maintaining the insulation between the tip line and the ring line at infinity (for example, 5 MΩ or more) under the applied DC voltage. Inversion detection block; It must be grounded to maintain the same potential with the power exchanger, and open detection to detect the openness of the line by maintaining the insulation between the tip line and the ring line at infinity (for example, 5MΩ or more) under the applied DC voltage. It characterized in that it comprises a block.

1 is a block diagram of a trunk line matching device of an electronic exchange according to the present invention;

2 will be described in detail with respect to the trunk line matching device of the electronic exchange according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: subscriber line holding block 200: ring detection block

300: voice path matching block 400: polarity inversion detection block

500: open detection block

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.

1 is a block diagram of a trunk line matching device of an electronic switch according to the present invention, which includes a subscriber line holding block 100, a ring detection block 200, a voice path matching block 300, and a polarity inversion detection block. 400 and an open detection block 500.

The subscriber line holding block 100 receives a direct current (DC) supplied through a tip line and a ring line while connected to a subscriber line, and receives a bridge diode BR1. Control to hold the flow of DC while maintaining a constant polarity through the ().

The ring detection block 200 is superimposed on any voltage provided through the ring line connected to the subscriber line, and from the tip line to the ring line during ringing provided through the tip line connected to the ground path of the subscriber line. Detect the ringing incoming signal ring.

The voice path matching block 300 lowers the mutual conductance of the AC signal provided through the bridge diode BR1 to design and output the voice signal to the voice output stage so that inductive noise is not generated.

The polarity inversion detection block 400 should be grounded (GND) to maintain the same potential with the power exchanger, and the voltage between the tip line and the ring line is maintained at infinity (for example, 5 MΩ or more) while the DC voltage is applied. To detect the presence or absence of polarity reversal.

The open detection block 500 should be grounded (GND) to maintain the same potential with the power exchanger, and maintains the insulation between the tip line and the ring line at infinity (for example, 5 MΩ or more) while applying DC voltage. Detects the presence of open.

Referring to the detailed circuit diagram of FIG. 2, the trunk line matching device of the electronic exchange according to the present invention will be described in detail based on the above-described configuration.

The subscriber line holding block 100 includes a holding control relay K1, a bridge diode BR1, a plurality of transistors Q1, Q2, Q3, a plurality of resistors R0, R1, R2, R3, R4, R5, photo coupler U1, zener diode D4, diode D1, and capacitance C3.

In more detail, the holding control relay K1 performs an on / off operation of the relay driver according to the switching operation of the transistor Q3 to perform a tip line and a ring line. Direct current (DC) is provided to the bridge diode BR1 in the state connected to the subscriber line in the power exchange.

Thereafter, the bridge diode BR1 maintains the polarity of the current provided through the holding control relay K1 at a constant polarity. The bridge diode BR1 has a constant polarity regardless of the voltage polarity of the tip line and the ring line. DC is supplied to the transistors Q1 and Q2 while maintaining.

The combination of a plurality of resistors R1, R2, R3, R4 and capacitance C3 connected to the transistors Q1, Q2 is a circuit for holding a constant current to flow, and has a constant polarity from the bridge diode BR1. It is provided with a direct current (DC) having a holding current flow so that the impedance (AC impedance) is maintained at 200 Ω or less of national and international standards.

Here, the alternating current (AC) impedance becomes infinity (∞) due to the characteristics of the transistors Q1 and Q2. The actual measured value is an impedance value determined by the sum of the resistors R3 and R4, and the transistors Q1 and Q2. In order to protect the holding circuit by means of the Zener diode (D4) using a zener diode (D4) is configured so that a specific voltage abnormality is not applied to both ends of the holding circuit, the photo coupler (U1) is a circuit for determining the presence of the holding (holding) state In addition, the current provided through the holding circuit by the transistors Q1 and Q2 is sensed to detect and notify the presence or absence of a holding state.

Next, the ring detection block 200 detects and responds to a ring that is an incoming signal corresponding to the incoming request signal. The ring detecting block 200 includes a mono stable vibrator U3A, a photo coupler U2, and capacitances C4, C5, C6) and a plurality of resistors R6, R7, and R8.

That is, the capacitance (C5, C6) is connected to the ring line connected to the trunk line exchange, the resistor (R6) is connected to the tip line connected to the trunk line exchange, it is 60 ~ 90Vrms and 20Hz sine through the ring line When a sine wave signal is supplied with a DC voltage of -48V, it is sinked through a tip line.

Here, the ring detection block 200 is a circuit designed to enable a low voltage, a DC output form, and a stable ringing form provided by a private exchange. Is designed to be detected as a uniform signal in a ringing state, and is designed so that the output signal is not toggled (toggled in another COIC 20Hz cycle).

In addition, the load impedance of the ring signal in the ring detection block 200 becomes infinity (∞) (for example, 5 M or more) in the DC state, and the load impedance in the bell current state maintains a constant capacity. It is designed to add resistance and capacitance loads to the tip line and ring line according to the specifications of each country.

More specifically, it is provided in superimposition at -48V through a ring line connected to a subscriber line (not shown) in a power exchange, and the tip line is connected to the ground path of the subscriber line, thus ringing. AC flows from the tip line to the ring line.

A resistor R6 is connected to a tip line, which is a ground potential connected to a subscriber line in a power exchange, and a photo coupler U2 is connected to the resistor R6, and a capacitance C5, to the photo coupler U2. C6) and resistor (R7) and mono stable vibrator (U3A) are connected, respectively, so that only 20Hz alternating current (AC) flows, and superimposed direct current (DC) is cut off using capacitance (C5, C6). Let's do it.

Thereafter, the photo coupler U2 is supplied with alternating current AC through a resistor R6 and toggled at a period of 20 Hz to be provided to the mono stable vibrator U3A. Then, the mono stable vibrator U3A maintains the signal toggled by the photo coupler U2 for at least 25 ms or more so that the state change is kept constant. Here, the role of the photo coupler U2 provides an isolation function.

Next, the voice path matching block 300 is a block composed of 2Wire-4Wire matching circuits, and includes a plurality of op amps U4A, U4B, and U4C, a transformer TO1, and an impedance matching resistor R11. And gain control resistors R12, R13, R14, R15, R16, R17, and R18.

That is, in the busy mode, the direct current (DC) signal among the direct current (DC) and alternating current (AC) signals provided through the bridge diode BR1 in the subscriber line holding block 100 is the subscriber line holding block. While provided to holding circuits by transistors Q1 and Q2 in 100, an alternating current (AC) signal is provided to the transformer (TO1) primary side via capacitance C1.

Thereafter, the AC signal is provided to the secondary side through the transformer (TO1) primary side, and the secondary side is impedance matching, which transmits a 2Wire voice signal to 4Wire, and 4Wire. It consists of a matching circuit to deliver the audio signal of 2 wires, so that the noise does not occur due to the potential difference. Here, the transformer (TO1) is designed to reduce the mutual conductance of the primary side and the secondary side so that inductive noise is not generated, thereby improving the call quality.

Further, in the busy mode, the transmission signal is transmitted from 2Wire to 4Wire direction, that is, the transformer (TO1) primary side signal is transmitted to the secondary side, and the resistors R16, R17 and R18 and the op-amp (OP-). AMP) is output to the voice output terminal through U4B.

On the other hand, in the busy mode, the received signal is a 4Wire to 2Wire direction, i.e., a transformer (TO1) secondary side signal is transferred to the primary side, and the transformer is input again. The signal transmitted to the (TO1) primary side is fed back to the secondary side and output to the voice output terminal through the resistors R16, R17 and R18 and the OP-AMP U4B.

Here, the amount of the voice signal fed back by the transformer TO1 is controlled by the OP-AMP U4C, and the same level as that of the voice signal input to the voice input stage is adjusted. It is designed to feed back to the voice output stage.

On the other hand, in a state in which the subscriber line holding block 100 is not operated, that is, in an on-hook state, the signal transmission function is performed through a transformer C2 at the tip line and the ring line end. (TO1) As only the AC voice signal is transmitted to the primary side, it can also function as a transmit / receive signal at the same time, so that the call number indication (CID) signal is transmitted to the voice stage during idle time during ringing. Used to send and receive signals.

Next, the polarity inversion detection block 400 detects the polarity inversion of the line voltage, and includes a plurality of resistors R22, R23, R24, R25, and R26, a comparator U5A, and a diode ( D6) and land gate U7A.

That is, the ground should be grounded (GND) to maintain the same potential with the power exchanger, and the voltage should be grounded above the coin since the insulation between the tip line and the ring line should be kept at least 5 MΩ while the DC voltage is applied. (GND) is possible. Here, the voltage polarity of the subscriber line in the power exchange can be connected at all times, and the polarity inversion has the polarity of the tip line of + voltage and the ring line of-voltage in the initial state. In the mid-stage state, the exchange exchange changes the voltage polarity of the tip and ring lines as a signal for possession, which means that the polarity reversal state is maintained until the call ends.

Lastly, the open detection block 500 is a block for detecting the presence or absence of a line open, and includes a plurality of resistors R9, R10, R19, R20, and R21, a comparator U5B, and a diode D5. And land gate U8A.

That is, the ground should be grounded to maintain the same potential with the power exchanger, and the insulation of the tip line and the ring line should be maintained at least 5 MΩ while the DC voltage is applied to detect the presence of the line. (GND) is possible. Here, the voltage polarity of the subscriber line in the switching center must always be connected and matched, and if it is connected regardless of the voltage polarity of the tip line and the ring line, it should always be detected, and the DC voltage of the tip line and the ring line should be Each line and the divided voltage are detected through a comparator (U5B) through a resistance of 10MΩ and 60KΩ, and mixed with the holding detection signal because the signal is held in a holding condition when the polarity is reversed. It is mixed to detect the presence or absence of the opening, and is always detected regardless of the inversion of the line voltage in the holding detection state.

As described above, the present invention is designed to maintain the call quality regardless of the grounding environment by using a small signal transformer to improve the quality of the voice path, thereby establishing a path for mutual transmission / reception of voice band signals during the subscriber and the exchange period. By providing the same function as the holding method through the existing high-capacity transformer, and by implementing the circuit itself in a hybrid, there is an effect that the cost of device components can be lowered because a large number of peripheral devices are not required.

Claims (22)

In the CO line matching device with the subscriber line in the electronic power exchange, In the state connected to the subscriber line, a direct current (DC), which is supplied through a tip line and a ring line, is supplied to have a constant polarity through a bridge diode BR1. A subscriber line holding block which controls to hold the flow of direct current while maintaining it; An incoming signal ring that flows from the tip line to the ring line during ringing provided through a tip line connected to the ground path of the subscriber line and overlapping any voltage provided through a ring line connected to the subscriber line A ring detection block for detecting a; A voice path matching block for lowering the mutual conductance of the AC signal provided through the bridge diode BR1 and designing a voice signal to prevent inductive noise and outputting the voice signal to the voice output stage; It is necessary to ground (GND) to maintain the same potential with the power exchanger, and to maintain the insulation between the tip line and the ring line at infinity (for example, 5MΩ or more) in the state of applying the DC voltage to detect the polarity of the voltage A polarity inversion detection block; Ground (GND) should be maintained to maintain the same potential with the power exchanger, and the insulation between the tip line and the ring line is maintained at infinity (for example, 5 MΩ or more) in the state of applying the DC voltage to detect whether the line is open. A trunk line matching device for an electronic exchange comprising an open detection block. The method of claim 1, wherein the subscriber line holding block, Holding control relay K1, bridge diode BR1, a plurality of transistors Q1, Q2, Q3, a plurality of resistors R0, R1, R2, R3, R4, R5, A main line matching device for an electronic exchange, comprising a photo coupler (U1), a zener diode (D4), a diode (D1), and a capacitance (C3). The method of claim 2, By holding a combination of a plurality of resistors (R1, R2, R3, R4) and capacitance (C3) connected to the transistors (Q1, Q2) to hold a constant current to flow, a constant polarity from the bridge diode (BR1) A trunk line matching device for an electronic exchange comprising: holding a flow of current so as to receive a direct current (DC) having a predetermined alternating current (AC) impedance or less. The method of claim 2, wherein the photo coupler (U1), The electronic exchanger is configured to determine whether a current is in a holding state, and detects and notifies the presence of a holding state by detecting a current provided through a holding circuit by the transistors Q1 and Q2. CO line matching device. The method of claim 3, wherein the alternating current (AC) impedance, The impedance value is determined by the sum of the resistors R3 and R4, and a holding circuit having a specific voltage or more by using the zener diode D4 to protect the holding circuit by the transistors Q1 and Q2. The trunk line matching device of the electronic exchanger, which is configured not to be caught at both ends. The method of claim 1, wherein the ring detection block, Trunk line matching device for an electronic exchange comprising a mono stable vibrator (U3A), a photo coupler (U2), capacitances (C4, C5, and C6), and a plurality of resistors (R6, R7, and R8). . The method of claim 6, The capacitances C5 and C6 are connected to a ring line connected to a trunk line exchanger, and the resistor R6 is connected to a tip line connected to a trunk line exchanger and has a sinusoidal waveform of 60 to 90 Vrms through the ring line. (Sine wave) When a signal charged with a predetermined DC voltage is provided, the trunk line matching device of the electronic exchange, characterized in that the sink (Sink) through the tip line (Tip Line). The method of claim 6, The ring detection block is a circuit designed to enable a low voltage form provided from a private exchange, a DC output form, and a balanced ringing form, and ring the form of an output signal. A trunk line matching device for an electronic exchange, characterized in that it is designed to be detected as a uniform signal in a) state so that the output signal is not toggled. The method of claim 8, The load impedance of the ring signal in the ring detection block is set to be infinite (∞) (eg, 5M or more) in a DC state, and the load impedance is designed to maintain a constant capacity in a bell current state. A trunk line matching device for an electronic exchange, characterized in that a resistance line and a capacitance load are added to an external line in a tip line and a ring line. The method of claim 6, A resistor R6 is connected to a tip line, which is a ground potential connected to the subscriber line, a photo coupler U2 is connected to the resistor R6, and capacitances C5 and C6 are connected to the photo coupler U2. And a resistor R7 and a mono stable vibrator U3A are connected to each other so that only an arbitrary alternating current (AC) flows, and the superimposed direct current (DC) is blocked by the capacitances C5 and C6. Trunk line matching device of an electronic exchange. The method of claim 10, wherein the photo coupler (U2), When the alternating current (AC) is received through the resistor (R6) and toggled at an arbitrary period and provided to the mono stable vibrator (U3A), the mono stable vibrator (U3A) is toggled by the photo coupler (U2). A trunk line matching device of an electronic exchange, characterized in that the state change is kept constant by keeping the signal above a certain value. The voice path matching block of claim 1, wherein Block consisting of 2Wire-4Wire matching circuits, which includes a large number of op amps (U4A, U4B, U4C), transformers (TO1), impedance matching resistors (R11), and gain control resistors (R12, R13, R14). And R15, R16, R17, and R18). A trunk line matching device for an electronic exchange. The method of claim 12, After the alternating current (AC) signal is provided to the transformer (TO1) primary side through the capacitance (C1), the alternating current (AC) signal is provided to the transformer (TO1) secondary side to match the impedance. and a matching circuit for transmitting the 2Wire voice signal to 4Wire and a matching circuit for transferring the 4Wire voice signal to 2Wire so that noise is not generated due to a potential difference. Trunk line matching device of the electronic exchange, characterized in that not to. The method of claim 13, The transformer (TO1) trunk line matching device of the electronic switch, characterized in that to improve the quality of the call by reducing the mutual conductance of the primary side and the secondary side to prevent inductive noise. The method of claim 13, Transmit the transmission signal in the busy mode from the transformer (TO1) primary side to the secondary side, and output voice through the resistors (R16, R17, R18) and OP-AMP (U4B) Trunk line matching device of an electronic exchange, characterized in that output to the stage. The method of claim 13, The transformer (TO1) receives the received signal in the busy mode from the secondary side to the primary side, and the signal transmitted to the transformer (TO1) primary side is fed back to the secondary side to the resistance A trunk line matching device for an electronic exchange, characterized in that output to a voice output terminal through (R16, R17, R18) and OP-AMP (U4B). The method of claim 16, The amount of the voice signal fed back by the transformer TO1 is controlled by the OP-AMP U4C, and is equal to the level of the voice signal introduced into the voice input stage. Trunk line matching device. Trunk line matching device of an electronic exchange, characterized in that one level is designed to be fed back to a voice output stage. The method of claim 17, As only the AC voice signal is transmitted to the transformer (TO1) primary side, it can also function as a transmit / receive signal at the same time, thereby transmitting a call number indication (CID) signal during idle time during ringing. (Voice) Trunk line matching device of the electronic exchange, characterized in that it is used for sending and receiving signals in the stage. The method of claim 1, wherein the polarity inversion detection block, A block for detecting the polarity inversion of line voltage, comprising a plurality of resistors (R22, R23, R24, R25, R26), a comparator (U5A), a diode (D6), and a land gate (U7A). Trunk line matching device of an electronic exchange. The method of claim 19, In order to invert the polarity of the line voltage, always connect the voltage polarity of the subscriber line to match, and in the initial state to have a polarity inversion of the tip line of the positive voltage and the ring line of the negative voltage, When the state becomes a heavy state, the line switching device of the electronic switch, characterized in that the polarity inversion state is maintained until the end of the call by changing the voltage polarity of the tip line and the ring line as a signal indicating the occupancy in the subscriber line. The method of claim 1, wherein the open detection block, A block for detecting the presence or absence of a line, comprising a plurality of resistors (R9, R10, R19, R20, R21), a comparator (U5B), a diode (D5), and a land gate (U8A). Trunk line matching device of an electronic exchange. The method of claim 21 In order to detect whether the line is open or not, always connect the voltage polarity of the subscriber line to be matched, and if it is connected regardless of the voltage polarity of the tip line and the ring line, it should always be detected, and direct current (DC) of the tip line and the ring line The voltage is detected by the comparator (U5B) of each line and the divided voltage, and since the signal is held in a holding condition when the polarity is reversed, it is mixed and held together with the holding detection signal. A trunk line matching device of an electronic exchange, characterized in that it is always detected regardless of whether or not the line voltage is inverted in a holding detection state.