KR20000033480A - Apparatus for preventing lightning in telephone line - Google Patents

Abstract

PURPOSE: An apparatus for preventing lightning in a telephone line is provided to prevent the communication equipment from damages to the communication equipment due to surge voltage caused by the lightning flowed from the telephone line. CONSTITUTION: A telephone line lightning prevention apparatus(200) configured between a communication equipment(100) and a switchboard(300) is composed of a first matching part(210), a second matching part(250), a DTMF(Dual Tone Multi Frequency) detection part(220), a control part(230), a switching part(240), and a ring detection part(260). The first and second matching parts(210,250) connected with the communication equipment(100) and the telephone line forms pseudo communication loops selectively. The DTMF detection part(220) detects and outputs DTMF signals supplied through the telephone line from the communication equipment(100). The control part(230) forms and controls the communication loop in the communication equipment(100) and the switchboard(300). The ring detection part(260) detects a ring detection signal and supplies it to the control part(230).

Description

Apparatus for protecting from thunder-bolt of telephone line

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing lightning of a telephone line, and in particular, to prevent damage to communication equipment based on surge voltage caused by lightning, etc., from a telephone line connected to communication equipment such as a computer or a telephone equipped with a modem. It relates to a lightning protection device of a telephone line.

In general, a telephone line coming from a switching station connected through a subscriber line of an exchange 30 is connected to communication equipment such as a computer 20 having a telephone 10 and a modem 21 as shown in FIG. Phone calls and data communications will be performed.

On the other hand, these telephone lines are always connected to the system, so when there is a lightning strike, surge voltages caused by lightning strikes are applied to the telephone and modem through the telephone line, which frequently causes damage to communication equipment such as telephones, modems, and computers. I have a problem.

On the other hand, in order to prevent the damage of the surge voltage through the telephone line described above, devices have been developed that detect the surge voltage and physically block the connection of the telephone line when the surge voltage is detected. Due to the speed limitations, there was a problem of not properly protecting the systems connected to the telephone line.

Therefore, the present invention has sought to connect the telephone line to the communication equipment only when the telephone line is used by detecting the use request in both directions of the telephone line rather than keeping the telephone line always connected.

The present invention has been made to solve the above-mentioned conventional problems, the object of the communication to detect the use state of the communication equipment in both directions in order to prevent damage to the communication equipment due to the surge voltage caused by lightning strikes from the telephone line It is to provide a lightning protection device for a telephone line so that the telephone line can be physically connected to the communication equipment only when the equipment is used.

1 is a diagram illustrating a connection relationship between communication equipment and a telephone line using a telephone line;

2 is a block diagram of an apparatus for preventing lightning of a telephone line according to the present invention.

<Description of the code | symbol about the principal part of drawing>

100: communication equipment 200: lightning protection device of the telephone line

210, 250: first and second matching section 220: DTMF detection section

230: control unit 240: switch unit

260: ring detection unit 270: telephone line level detection unit

300: exchanger

An apparatus for preventing lightning of a telephone line according to the present invention includes a first matching unit connected to communication equipment to selectively form a call loop of an exchange, and a DTMF signal detected by detecting a DTMF signal applied from the communication equipment through a telephone line. DTMF detection unit for outputting the signal, and when the DTMF signal is applied to output a switching signal to control the connection of the telephone line, and to control the call loop of the communication equipment and the exchange side and generate and output the DTMF signal, when the ring detection signal is applied Outputting the switching signal to control the connection of the telephone line, blocking the call loop of the communication equipment and the exchange side, generating a ring signal, stopping the output of the switching signal based on the applied telephone line level detection signal, A control unit for forming and controlling a call loop on the exchange side, and based on a switching signal from the control unit A switch unit for switching the telephone line connected to the communication equipment with the telephone line incoming from the exchanger, a second matching unit connected with the telephone line incoming from the exchanger to selectively form a call loop of the communication equipment, A ring detection unit connected to a telephone line and detecting a ring signal from an exchange to apply a ring detection signal to the control unit; and a telephone line level detecting a voltage level of a telephone line to detect a state of use of the telephone line and outputting the telephone line level detection signal. Characterized in that it comprises a detection unit.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of an apparatus for preventing lightning of a telephone line according to the present invention, wherein the apparatus for preventing lightning of a telephone line 200 configured between the communication equipment 100 and the switch 300 of the telephone station is the first and second matching unit 210. , 250), a DTMF detector 220, a controller 230, a switch 240, and a ring detector 260.

In this configuration, the communication equipment 100 is a device for performing two-way communication using a telephone line, and includes a television and a fax machine having a telephone and a modem.

In addition, the exchange 300 is connected to each exchange through a public telephone network to determine the communication partner to connect the communication path.

On the other hand, the first matching unit 210 of the lightning protection device 200 of the telephone line is connected to the communication equipment 100 to selectively form a call loop with the switch under the control from the control unit 230 to Even if the connection is physically blocked based on the switch unit 240 to be described later to enable the communication request from the communication equipment 100.

The dual tone multi-frequency detection unit 220 detects a dial DTMF signal for the other party's call applied from the communication device 100 and applies the detected DTMF signal to the control unit 230.

In addition, when the DTMF signal is applied from the DTMF detector 220, the controller 230 controls the first and second matching units 210 and 250 to block the call loop, and outputs a switching signal to the switch unit 240. The telephone line is physically connected and controlled, and the DTMF signal detected by the DTMF detection unit 220 generates and outputs the applied DTMF signal through the telephone line. When the ring detection signal is applied from the ring detector 260 described later, the first and second matching units 210 and 250 are provided. ) To block the call loop by controlling the driving, output the switching signal to the switch unit 240 to physically control the telephone line, generate a predetermined ring signal and output it through the telephone line, and from the telephone line level detection unit 270. If it is determined that the telephone line is not used based on the telephone line level detection signal of the control unit, the first and second matching units 210 and 250 are driven to form a call loop, and the switch unit 240 controls the telephone line. Logically blocking control.

On the other hand, the switch unit 240 is selectively switched based on the switching signal from the control unit 230 to selectively connect or disconnect the telephone line connection between the communication equipment 100 and the telephone exchange 300 of the telephone station.

In addition, the second matching unit 250 is selectively driven under the control of the controller 230 and connected to a telephone line drawn from the switch 300 to selectively form a call loop of the communication equipment.

In addition, the ring detection unit 260 detects the ring signal from the switch 300 and applies a predetermined ring detection signal to the control unit 230.

On the other hand, the telephone line level detection unit 270 detects the use of the telephone line to cut off the connection of the switch unit 240 when not using the telephone line. The level of the voltage flowing at the time of use and at the time of non-use differs, Therefore, a change of this voltage level is detected, and a predetermined telephone line level detection signal is applied to the control part 230. FIG.

Next, the operation of the lightning protection device 200 of the telephone line according to the present invention having the above-described configuration will be described in detail.

First, when the communication line 100 does not use the telephone line, the switch unit 240 of the lightning protection device 200 of the telephone line maintains the switching off state based on the switching control of the controller 230.

At this time, the first matching unit 210 forms a call loop with the exchange as if the communication device 100 is normally connected through the telephone line so that the communication equipment 100 operates normally under the control of the control unit 230.

In addition, the second matching unit 210 also forms a call loop with the telephone as if the switch 300 is normally connected through the telephone line so that the switch 300 is normally operated under the control of the controller 230.

On the other hand, if the DTMF signal is output from the communication equipment 100 when performing the outgoing control to perform communication using the communication equipment 100 in the above-described state, the DTMF signal is detected by the DTMF detection unit 220 and the control unit Is passed to 230.

Then, the controller 230 controls the first and second matching units 210 and 250 to cut off the formed call loop, and controls the switch unit 240 to connect the communication equipment 100 and the exchange 300 to a telephone line. do.

Then, the control unit 230 generates a DTMF signal applied from the DTMF detection unit 220 to apply to the telephone line.

Accordingly, the exchange 300 may receive a DTMF signal generated from the communication equipment 100, and a communication path with the other party may be allocated based on the operation of the exchange 300 to perform communication.

On the contrary, when the incoming control of the communication equipment 100 is performed from the switch 300 through another subscriber in a state where the switch unit 240 is blocked, a predetermined ring signal is generated and applied from the switch 300.

In this case, the ring detection unit 260 detects a ring signal applied from the exchange 300, and when a ring signal is detected, applies a predetermined ring detection signal to the control unit 230.

Then, the control unit 230 receives a ring detection signal from the ring detection unit 260, in this case, the control unit 230 controls the first and second matching units 210 and 250 to block the tentative call loop, The switch unit 240 is controlled to connect and control the communication equipment 100 and the exchange 300 through a telephone line.

Next, the controller 230 generates a predetermined ring signal and applies it to the communication equipment 100 through the telephone line.

Accordingly, the communication equipment 100 may receive a ring signal, which is an incoming signal from the switch 300, to perform incoming control to perform communication.

On the other hand, when the communication is terminated after the communication is performed in the state in which the telephone line is connected based on the incoming / outgoing control described above, the telephone line level detector 270 detects the voltage level of the telephone line and applies it to the controller 230.

Typically, the telephone line maintains a different voltage level when used and when not used, and the telephone line level detector 270 detects the use of the telephone line using this point.

Therefore, when the telephone line is determined to be inactive based on the telephone line level detection signal from the telephone line level detection unit 270, the microcomputer 20 controls the first and second matching units 210 and 250 to form a call loop, and the switch unit. The control unit 240 controls the telephone line to physically block the communication equipment 100 and the exchange 300.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

As described above, according to the present invention, by selectively connecting and controlling the telephone line connected to the communication equipment in accordance with the presence or absence of the effect, it is possible to protect the communication equipment by blocking the surge voltage due to lightning strikes that can be applied through the telephone line There is.

Claims (1)

A first matching unit 210 connected to the communication equipment 100 to selectively form a call loop of the exchange 300; A DTMF detector 220 for detecting a DTMF signal applied from the communication equipment 100 through a telephone line and outputting the detected DTMF signal; When the DTMF signal is applied, the switching signal is output to control the connection of the telephone line, and the call loop of the communication equipment and the switch is controlled, and the DTMF signal is generated and output. When the ring detection signal is applied, the switching signal is output to the telephone line. Control the connection of the circuit board, block the call loop on the communication equipment and the exchange side, generate a ring signal, stop the output of the switching signal based on the applied telephone line level detection signal, and form the call loop on the communication equipment and the exchange side. A control unit 230 for controlling; A switch unit 240 that is switched based on a switching signal from the controller 230 and connects a telephone line connected to the communication equipment 100 with a telephone line drawn from the exchange 300; A second matching unit 250 connected to a telephone line incoming from the exchange 300 to selectively form a call loop of the communication equipment; A ring detector 260 connected to a telephone line incoming from the switch 300 to detect a ring signal from the switch 300 and to apply a ring detection signal to the controller 230; And a telephone line level detection section (270) for detecting a voltage level of the telephone line and outputting the telephone line level detection signal to detect a state of use of the telephone line.