JPH033472A - Modulator-demodulator - Google Patents

Abstract

PURPOSE:To facilitate the line changeover and to reduce line charge by adding a monitor and automatic restoration function to a private line for dial backup private line to a conventional MODEM with dial backup function. CONSTITUTION:A tone transmission section 8 generating a prescribed frequency tone is provided to a MODEM able to connect a data terminal equipment to either a private line or a subscriber telephone line among communication lines and a changeover means 5 supplies a signal from a private line 32 or a signal from a network control section 6 to a call progress tone detection section 7. Then the tone transmission section 8 or a MODEM section 2 is connected to the private line 32 and a total control section 4 controls the changeover of the changeover means 5. Thus, the automatic changeover is applied, then the changeover from the subscriber telephone line to the private line is automated and the line charge of the subscriber telephone line is saved.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a modulation/demodulation device that performs data communication using a subscriber telephone line or a dedicated line. The present invention relates to a modulation/demodulation device that avoids this.

[Conventional technology]

As shown in FIG. 2, a conventional modulation/demodulation device 11 of this type includes a modulation/demodulation section 12, a switch 13, a total control section 14,
It is configured to include a relay 15 as a switching means, a network control section 16, and a call progress tone detection section 17.

Here, the modulation/demodulation section 12 sends out a transmission signal from the data terminal 20 as a transmission signal to the communication line 30, and
It is configured to provide a transmission signal from the communication line 30 to the data terminal 20 as a received signal. The network control unit 16 is capable of controlling connection/disconnection of the communication line 30 to the subscriber telephone line 31. Relay 1 as a switching means
5 is capable of controlling connection/disconnection with the dedicated line 32 of the communication line 30. The call progress tone detection section 17 is capable of detecting the tone level and its content. The total control section 14 is capable of taking in setting information of the switch 13 and information from the call progress tone detection section 17, and controlling the operations of the modulation/demodulation section 12, the relay 15, and the network control section 16.

According to such a modulation/demodulation device 11, communication is normally performed via a dedicated line 32. Here, if the general control unit 14 determines that the line quality of the dedicated line 32 has deteriorated due to a momentary interruption or the like and a problem has occurred in data communication, the general control unit 14
At the same time, the network controller 16 is controlled to switch the communication line 30 from the dedicated line 32 to the subscriber telephone line 31, so that data communication can be continued.

The above-mentioned operation is performed on the sending side, but naturally the receiving side also automatically performs similar operations.

[Problem to be solved by the invention]

However, in the case of the modulator/demodulator 11, it is not a good idea to leave the communication line 30 on the subscriber telephone line 31 side forever because the line usage fee is high.

Therefore, the modem 11 performs control to switch the communication line 30 from the subscriber telephone line 31 to the dedicated line 32. Since there is no means to monitor the status of the dedicated line 320, such switching is possible using a manual switch.
I tried switching to 2 to see if data communication was possible. Therefore, in the modem 11,
There are disadvantages in that it is difficult to switch from the subscriber telephone line 31 to the dedicated line 32, and the usage fee for the subscriber telephone line 31 is high.

The present invention has been made to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a modulation/demodulation device that facilitates line switching and reduces line usage charges.

[Means to solve the problem]

A modulation/demodulation device of the present invention includes a modulation/demodulation section that sends a transmission signal from a data terminal to a communication line as a transmission signal, and provides a transmission signal from the communication line to the data terminal as a reception signal, and a subscriber telephone line of the communication line. a network control unit that controls connection to and disconnection from the dedicated line of the communication line, a switching unit that connects and disconnects the dedicated line of the communication line, a call progress tone detection unit that detects the tone level and its content, and the operation of each component. A modem and a modem are equipped with a general control unit for controlling a data terminal, and are capable of connecting a data terminal to either a dedicated line or a subscriber telephone line among communication lines, and are equipped with a tone sending unit that generates a tone of a predetermined frequency. , and the switching means is configured to be capable of supplying a signal from the dedicated line or a signal from the network control unit to the call progress tone detection unit, and to connect the tone sending unit or the modulation/demodulation unit to the dedicated line, and the total control unit is The present invention is characterized in that it is configured to control switching of the switching means.

Since the present invention enables automatic switching, it is possible to automatically switch from a subscriber telephone line to a dedicated line, and to reduce line usage charges for the subscriber telephone line.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a modulation/demodulation device of the present invention. The modulation/demodulation device l shown in FIG. It is configured with.

Here, the modulation/demodulation section 2 is configured to send out a transmission signal from the data terminal 20 as a transmission signal to the communication line 30, and to give a transmission signal from the communication line 30 to the data terminal 20 as a reception signal. The switch 3 is designed to provide conditions for the line to be connected. The general control section 4 takes in setting information of the switch 3 and information from the call progress tone detection section 7, and is capable of controlling each operation of the modulation/demodulation section 2, the switching means 5, the network control section 6, and the tone transmission section 8. It has become. The switching means 5 includes a first relay 51, a second relay 52, and a third relay 53. The first relay 51 connects either the tone sending section 8 or the third relay 53 to the second relay 52.

The second relay 52 connects the first relay 51 or the modem unit 2 to the dedicated line 32. The third relay 53 connects either the first relay 51 or the network control section 6 to the call progress tone detection section 7. The network control unit 6 is capable of controlling connection/disconnection of the modulation/demodulation unit 2 to the subscriber telephone line 31 of the communication line 30. The call progress tone detection section 7 is capable of detecting the tone level and its content.

The operation of the embodiment configured in this way will be explained.

First, the operation up to dial backup operation is the same as that of the conventional modem 11, so the explanation will be omitted.

When the dial backup operation starts, the general control unit 4 performs the following steps.
The second relay 52 of the switching means 5 is connected to the first relay 51 side, and the third relay 53 is connected to the first relay 51 side. Next, the calling side and the called side will be explained separately.

(Sending side) The general control unit 4 controls switching of the first relay 51, connects the tone sending unit 8 to the dedicated line 32, and connects the tone sending unit 8 to the four
00 (Hz))-on to the dedicated line 32. Thereafter, the tone sending section 8 is controlled to send out 400 [7] tones for a predetermined fixed period of time. Next, the total control unit 4
The first relay 51 is switched and controlled so that the call progress tone detection section 7 is connected to the dedicated line 32. The call progress tone detection unit 7 detects the content of the 400 (Hz) tone sent from the called party and outputs it to the general control unit 4.

When the general control unit 4 determines that it is possible to return to the dedicated line 32 based on the output signal from the call progress tone detection unit 7, it switches and controls the second relay 52 to restore the dedicated line 3.
The modulation/demodulation section 2 is connected to the terminal 2. Further, the general control section 4 switches and controls the third relay 53 so that the network control section 6 and the call progress tone detection section 7 are connected.

Thereafter, data communication is restored to the dedicated line 32.

Furthermore, the network control unit 6 is released.

Here, if the general control unit 4 determines based on the output signal from the call progress tone detection unit 7 that there is a problem in restoring the subscriber telephone line 31 to the dedicated line 32, it repeats the above-mentioned sequence at regular time intervals. become.

(Receiving side) The general control unit 4 controls the first relay 51 of the switching means 5, connects the call progress tone detection unit 7 to the dedicated line 32, and detects the 400 (Hz) signal sent from the calling side. be able to detect the Here, when the call progress tone [117] detects the 400 [7] tone, the call progress tone detection section 7 gives the result to the general control section 4.

When the general control unit 4 correctly determines the output signal from the call progress tone detection unit 7, it controls switching of the first relay 51 of the switching means 5 so that the tone transmission unit 8 is connected to the dedicated line 32. . Thereafter, the total control section 4 controls the tone sending section 8 to -400 (Hz) for fixed time response).
- signal is generated and sent to the dedicated line 32. Next, the switching means 5 is connected to the dedicated line 32 so that the modem section 2 is connected to the dedicated line 32.
The third relay 52 is switched and controlled. From now on, dedicated line 32
Data communication will be restored. When the general control unit 4 determines that data communication through the dedicated line 32 is being performed satisfactorily, the subscriber telephone line 31 is released.

Here, if the general control unit 4 determines that there is a problem with data communication on the dedicated line 32, it returns to data communication on the dedicated line 32 and repeats the above-described sequence at regular time intervals.

As described above, in this embodiment, the function of monitoring the dedicated line 32 during dial backup and automatically returning to the dedicated line 32 is added to the conventional modem with dial backup function, so that the dedicated line can be switched from the subscriber telephone line 31 to the dedicated line 32. It is easy to return to 32 and does not require any human operation,
Further, line usage charges for the subscriber telephone line 31 can be reduced.

〔Effect of the invention〕

As explained above, since the present invention enables automatic switching, it is possible to automatically switch from a subscriber telephone line to a dedicated line, and has the effect of reducing line usage charges for the subscriber telephone line.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional device. 1...Modulation/demodulation device, 2...Modulation/demodulation unit,
4... General control section, 5... Switching means, 6
...Network control unit, 7...Call production stone detection section, 8...
...Tone sending section.

Claims (1)

[Claims] A modulation/demodulation section that sends a transmission signal from a data terminal as a transmission signal to a communication line, and also supplies a transmission signal from the communication line to a data terminal as a reception signal, and controls connection/disconnection of the communication line to a subscriber telephone line. a network control section, a switching means for connecting/disconnecting the dedicated line of the communication line, a call progress tone detection section for detecting the tone level and its content, and a general control section for controlling the operation of each of the above-mentioned components. In the modulation/demodulation device, the data terminal can be connected to either a dedicated line or a subscriber telephone line among the communication lines, further comprising a tone sending section that generates a tone of a predetermined frequency, and the switching means is configured to , the call progress tone detection unit is capable of supplying a signal from a dedicated line or a signal from the network control unit, and the tone sending unit or the modulation/demodulation unit is connectable to the dedicated line, and the general control unit is connected to the switching unit. What is claimed is: 1. A modulation/demodulation device characterized in that the modulation/demodulation device is configured to control switching.