KR20010102721A - Ring signal and direct current generating device for telephone line when wireless connection - Google Patents

Abstract

The present invention relates to a device for generating a ring signal and a direct current when a wired communication device such as a fax or a modem is wireless.

The device of the present invention relates to a case where a wired communication device using a telephone line is wirelessly connected to a telephone outlet or a telephone line terminal on a wall without using an extension line or a wire by using a wireless circuit. Add + to boost commercial power and output + 48V power, control circuit to output + 48V, 20Hz or equivalent signal that wired communication device can recognize as external ring signal, and wired communication device operate By providing a circuit for supplying a DC current in the circuit so that the existing wired communication devices can be easily connected to the wireless device.

Description

Ring signal and direct current generating device for telephone line when wireless connection}

The present invention relates to a device for generating a ring signal and a direct current when a wired communication device such as a fax or a modem is wireless.

In general, telephones, which are wired communication devices, are widely used in all offices and homes. In particular, offices use a lot of lines, and to connect them, each telephone installation site is connected by wire through a private exchange. Therefore, such a wire line is difficult to install, not only aesthetically good, but also may damage these lines as people or carts pass by.

The representative ones of wired communication devices that can communicate using telephone lines are fax and modem, and there is inconvenience in that an extension line must be connected from the telephone line outlet of the wall to the equipment installation location when the telephone line is connected.

In order to solve the above problems, there has been developed a device that can wirelessly connect to a telephone line outlet or telephone line terminal of a wall without using an extension line or a wire by using a wireless circuit to a wired communication device that communicates using a telephone line. There are many problems with circuits for detecting signals and with devices that supply direct current.

Accordingly, an object of the present invention is to provide a ring signal and a direct current generating device when wirelessizing a wired communication device.

Another object of the present invention is to provide a circuit for adding a DC / DC converter to a wired communication connection circuit and boosting a commercial power supply to output a + 48V power supply.

It is still another object of the present invention to provide a circuit for controlling a power supply and outputting an equivalent signal that can be recognized as an external ring signal by + 48V, 20Hz or a wired communication device.

Another object of the present invention is to provide a circuit for supplying a DC current in the circuit to operate the wired communication device.

In order to achieve the above object, the device according to the present invention is connected to a wired communication circuit to wirelessly connect a wired communication device using a telephone line to a telephone outlet or a telephone line terminal on a wall without using an extension line or a wire by using a wireless circuit. Adds a DC / DC converter to the circuit to boost commercial power and outputs + 48V power, and controls the power to output + 48V, 20Hz or an equivalent signal that can be recognized as an external ring signal by wired communication equipment. And, by having a circuit for supplying a DC current in the circuit so that the wired communication device can operate the existing wired communication devices can be easily connected to the wireless device.

1 is a view showing a general configuration of a wired communication device according to the prior art.

Fig. 2 is a diagram showing the overall configuration when wirelessizing a wired communication device.

3 is a diagram illustrating a wireless circuit configuration connected to a telephone line outlet.

4 is a diagram illustrating an apparatus for processing a signal received from the apparatus of FIG. 3 and delivering the signal to a wired communication device.

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

10: telephone line 11: telephone line connection circuit

12: wired communication device connection circuit 13: wired communication device

20: telephone line outlet 21: ring signal detection circuit

22: central processing unit 23: telephone line interface circuit

24: hook switch 25,32: transmission circuit

26, 31: antenna 27, 30: receiving circuit

33: DC / DC converter 34: input power

35 DC current generating circuit

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

1 is a view showing the configuration of a wired communication device according to the prior art. Here, the telephone line interface circuit 1 incorporates an additional circuit that can check whether the telephone line operates normally. The wired communication device includes a ring signal detection circuit 2 in which the hook switch 5 detects a ring signal in an on hook state, and a current detection circuit 3 in which a direct current is detected in an off hook state. The ring signal detection circuit 2 is a circuit for detecting a call signal from a telephone station, and the current detection circuit 3 is a current for the connection line when a telephone station or a private telephone switchboard and a communication device using a telephone line operate normally. It detects this current and checks if the current connection is normal. The interface circuit 1 is connected to a device such as a fax 4 or a modem.

Therefore, when connecting a wireless circuit to a conventional telephone line connection device, a circuit for supplying a ring signal and a direct current to the wireless circuit should be added, which will be described below with reference to FIGS. 2, 3, and 4.

2 is a view showing the overall radio communication device having a ring signal and a direct current supply device according to the present invention. On the main phone side, a telephone line connection circuit 11 connected to the external telephone line 10 is provided, and on the magnetic side, a circuit 12 and a wired communication device 13 are connected to the wired communication device.

FIG. 3 is a diagram illustrating a configuration of a wireless circuit connected to the telephone line outlet shown in FIG. 2.

Two terminals are connected from a telephone line outlet 20 or a terminal box installed on the wall, and a ring signal detection circuit 21 is connected between both ends thereof. The central processing unit 22 detects an external ring signal and converts it into digital data. Send a signal to Downstream of the ring signal detection circuit 21, a telephone line interface circuit 23 is connected via a hook switch 24. The telephone line interface circuit 23 maintains the telephone line impedance at a constant value, such as 600 kW, in a national standard when the hook switch 24 is off-hook, and includes a circuit such as a transmitting circuit, a receiving circuit, and a central processing unit. It is a circuit that cuts off the power supplied to the outside through the telephone line and transmits only the signal component to the outside.

The transmission circuit 25 located downstream of the telephone line interface circuit 23 is a circuit which modulates a signal input through the telephone line outlet 20, converts the signal into a high frequency radio signal, and transmits it to the antenna 26.

In addition, the antenna 26 receives the signal and restores the radio signal to the original data signal through the receiving circuit 27 and inputs the restored signal to the telephone line interface circuit 23.

The central processing unit 22 controls the operation of the entire circuit, and when the ring signal is detected by the ring signal detecting circuit, the central processing unit 22 inputs the signal to control the transmitting circuit. It generates a signal to inform the circuit connecting the wired communication device that the ring signal has been input and controls the operation of the wireless transmission / reception circuit.

4 is a circuit for receiving a signal generated in FIG. 3 and transmitting a signal to a wired communication device. The receiving circuit 30 is a circuit for demodulating data contained in a high frequency signal input through an antenna 31.

The transmitting circuit 32 connected to the antenna 31 is a circuit for demodulating a signal transmitted from a telephone line connecting device into a high frequency signal and transmitting the signal to a telephone line outlet circuit.

The DC / DC converter 33 is a circuit for generating a voltage of + 48V by inputting an input voltage 34, which is an AC adapter or a computer internal power source, and a ring signal is generated at a telephone line outlet connection circuit (or telephone line terminal box) at a transmission circuit. When the received signal is transmitted to the central processing unit, the central processing unit controls the ring signal generating circuit to generate a ring signal of 48V or 20Hz.

The DC current generating circuit 35 is a circuit for transmitting a current of approximately 10 to 20 mA to the telephone line connecting device so as to detect a ring signal at the telephone line connecting device and to indicate that the line is normally connected when the device is set to use. The connected device detects this current and verifies that the telephone line is normally connected.

The central processing unit 36 is responsible for the control of the circuit connected to the wired communication device. It checks the operation state of the telephone line connection device and controls the ring signal and DC current supply, and it controls the operation of the wireless transceiver circuit.

Descriptions of the telephone line interface circuit and the telephone line connection device have already been described above, and detailed descriptions thereof will be omitted to avoid duplication.

When the wired communication device according to the present invention configured as described above is wireless, the ring signal and the direct current generator have the following effects.

-It has the effect of detecting the ring signal more reliably when wirelessly making the wireless device operate reliably.

-It detects the DC current during wireless and checks if the current line is normally connected when the telephone station or private exchange and the communication device using the telephone line are normally connected.

-The DC / DC converter is added to the circuit connected to the wired communication circuit to boost the commercial voltage to easily supply + 48V power.

By controlling the power supply, + 48V, 20Hz or wired communication device outputs an equivalent signal that can be recognized as an external ring signal, thereby making it easy to recognize the ring signal.

-Since the DC current is supplied from the circuit of the present invention so that the wired communication device operates, a separate power supply device can be omitted, thereby reducing the weight of the device and reducing the cost.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited thereto but may be included in the present invention without departing from the spirit of the present invention and will be apparent to those skilled in the art.

Claims (3)

A ring signal detection circuit 21 is connected between both terminals of the telephone line outlet 20 installed on the wall to detect an external ring signal, convert it into digital data, and transmit the signal to the central processing unit 22. 23 is connected via a hook switch 24. The telephone line interface circuit 23 maintains the telephone line impedance at a constant value, such as 600 kW, when the hook switch 24 is off hook. Blocks power supplied to a circuit such as a processing device from being transmitted to the outside through a telephone line and transmits only signal components to the outside, and the transmitting circuit 25 modulates a signal input through the telephone line outlet 20 to generate high frequency radio waves. The signal is converted into a signal and transmitted to the antenna 26. The antenna 26 receives the signal and restores the radio signal to the original data signal through the receiving circuit 27. The restored signal is input to the telephone line interface circuit 23, the central processing unit 22 controls the operation of the entire circuit and the operation of the wireless transmission / reception circuit, and the receiving circuit 30 through the antenna 31 The demodulated data contained in the input high frequency signal is transmitted, and the transmitting circuit 32 connected to the antenna 31 demodulates the signal transmitted from the telephone line connecting device into the high frequency signal and transmits the signal to the telephone line outlet circuit. 36) is a device for generating a ring signal and direct current when controlling a circuit connected to a wired communication device and wirelessizing a wired communication device that controls an operation of a wireless transceiver circuit. The DC / DC converter 33 circuit which inputs the input voltage 34 to generate a voltage of + 48V, and the transmission circuit receives the ring signal from the telephone line outlet connection circuit and transmits the received signal to the central processing unit. The central processing unit controls the ring signal generating circuit to generate ring signals of 48V and 20Hz, and detects the ring signal from the telephone line connecting device and indicates that the line is normally connected when the device is in use. And a DC current generating circuit (35) for applying a current of 20 mA to a telephone line connection device. The method of claim 1, A device for generating a ring signal and a direct current when the wired communication device is wireless, characterized in that said input voltage (34) is an AC adapter. The method of claim 1, A device for generating a ring signal and a direct current when the wired communication device is wireless, characterized in that said input voltage (34) is a power source inside a computer.