KR20030052303A - WLL terminal having a public-telephone management data transmission function - Google Patents

Abstract

PURPOSE: A WLL(Wireless Local Loop) terminal including a function to transmit public telephone management data is provided to arrange a data converter capable of processing serial data to process public telephone management data transmitted between a public telephone and a public telephone management system, so as to stably transmit the public telephone management data to a destination without signal distortion. CONSTITUTION: An interface(2) connects a public telephone(1) for interface of communication signals and charging information of the public telephone(1). A codec(3) converts analog voice signals inputted through the interface(2) into PCM(Pulse Code Modulation) digital signals, or converts inputted digital voice signals into analog signals. A data converter(4) demodulates a character data type of analog public telephone management data inputted through the interface(1), to restore the analog data to digital data and output the restored data. And an MSM(Mobile Station Modem)(5) receives the communication signals of the public telephone(1) and the charging information according to calls from an external communication network to transmit the received signals and information, and processes the public telephone management data transceived through the data converter(4).

Description

WLL terminal having a public-telephone management data transmission function

The present invention relates to a WLL terminal having a public telephone management data transmission function. In particular, the WLL terminal includes a data conversion unit capable of serial data processing, thereby processing public telephone management data transmitted between a public telephone and a public telephone management system. The present invention relates to a WLL terminal having a public telephone management data transmission function which is stably transmitted to a destination without distorting a signal while the public telephone management data is transmitted.

In general, as the industrial society develops, information communication systems are widely used to transfer data from one point to another desired more appropriately and quickly. Such communication systems are usually homogeneous or heterogeneous communication devices which are geographically dispersed. In most cases, information devices are connected to a network to enable sharing and communication of resources.

In addition, in such a network, a telephone system is usually used through an exchange to exchange information converted into an electric signal with a counterpart. Such a telephone includes a general telephone and a public telephone equipped with a charging function for the telephone. Usually included. In recent years, however, wireless telephones have been utilized by connecting such public telephones to WLL terminals.

Then, referring to FIG. 1, the detachable WLL terminal connected to the conventional public telephone as described above, the public telephone 70 is connected to, for example, an RJ-11 port to interface a communication signal and charging information of the public telephone 70. A codec 72 for converting an analog signal input through the interface unit 71 into a digital signal or converting an input digital signal into an analog signal; and a communication signal of the public telephone 70. It includes a mobile station modem (MSM) for processing and receiving and transmitting the billing information according to the call from an external communication network.

In addition, the public telephone 70 is provided with a card insertion hole 75 into which a public telephone card 74 can be inserted and an input hole 76 into which coins can be inserted.

Here, the public telephone 70 transmits / receives management data information such as billing information and public telephone management data, for example, call history or tone type change signal, to the wireless switching system 78 via the WLL terminal 77.

On the other hand, look at the operation of the WLL terminal connected to the conventional public telephone as described above, first, when the user holding the handset 79 in the public telephone 70 is a public telephone card 74, the card insertion slot 75, coin In this case, when each of the coin input 76 is put into the phone, a sound is generated. When the user presses the telephone number signal, the telephone number signal is processed to a predetermined signal and outputted to the WLL terminal 77 through the RJ-11 port. Then, the interface unit 71 of the WLL terminal 77 interfaces and outputs the analog signal transmitted from the public telephone 70 to the codec 72. The codec 72 converts the input analog signal into a digital signal and outputs the digital signal to the MSM 73. In addition, the MSM 73 processes the RF communication signal of the input public telephone 70 and emits the radio signal. Then, the communication signal of the WLL terminal 77 is exchanged by the radio switching system 78 located in the adjacent area and transmitted to the other party's telephone 81 through the PSTN network 80. At this time, when the user of the other party's telephone 81 picks up the handset, the incoming call is transmitted to the public telephone 70 through the reverse process, so that a voice channel is formed between them. In addition, the public telephone 70 performs a normal call function through the formed voice channel.

Here, the public telephone 70 converts the management data, such as public telephone management data, for example, call history, into an analog signal through a built-in data modem (not shown) at a predetermined time, for example, 12 pm, and the WLL. Transfer to the terminal 77. Then, the interface unit 71 of the WLL terminal 77 interfaces with the input analog public telephone management data and inputs it to the codec 72. The codec 72 converts the input analog public telephone management data into a PCM digital signal and transmits the same to the MSM 73. Then, the MSM 73 transmits the input public telephone management data to the radio switching system 78 so that the radio switching system 78 manages the public telephone by referring to the public telephone management data.

However, the WLL terminal connected to the conventional public telephone as described above is converted to an analog signal by a data modem embedded in the public telephone 70 and is converted to an codec 72 through an analog line of the WLL terminal 77. In this case, the codec 72 restores the digital data using the PCM method based on the voice signal, so that signal distortion occurs in the public telephone management information such as the text data, and thus, the codec 72 cannot be used as the normal public telephone management information. The WLL terminal, such as the voice signal processing, has to transmit and receive public telephone management information in the form of text data to the public telephone through the analog line, thereby causing a problem of significantly lowering the reliability of the public telephone management.

Accordingly, the present invention has been invented to solve the conventional problems as described above, by having a data conversion unit capable of serial data processing in the WLL terminal by processing the public telephone management data transmitted between the public telephone and the public telephone management system, It is an object of the present invention to provide a WLL terminal equipped with a public telephone management data transmission function which stably transmits the public telephone management data to the destination without distorting the signal while the public telephone management data is transmitted. .

Another object of the present invention is to pass the public telephone management data to the public telephone management system through a pass different from the voice signal, or vice versa to control the public telephone by transmitting control data, thereby maximizing the management efficiency of the public telephone. The present invention provides a WLL terminal equipped with a public telephone management data transmission function.

In order to achieve the above object, the present invention provides an interface unit for connecting a public telephone to interface a communication signal and charging information of a public telephone, and converts an analog voice signal input through the interface unit into a digital signal of a PCM method or A codec for converting an input digital voice signal into an analog signal, a data conversion unit for demodulating and outputting analog public telephone management data in the form of text data input through the interface unit to digital data, and a communication signal of the public telephone. And it provides a WLL terminal with a public telephone management data transmission function including the MSM for receiving and charging the payment information according to the call from an external communication network and processing the public telephone management data transmitted and received through the data conversion unit.

1 is an explanatory diagram illustrating a conventional WLL terminal to which a public telephone is connected.

2 is an explanatory diagram illustrating a WLL terminal of the present invention.

3 is an explanatory diagram illustrating a data conversion unit of the present invention.

<Detailed Description of Codes>

1: public telephone 2: interface unit

3: codec 4: data converter

5: MSM 6: receiving amplifier

7: Wireless Switching System 8: Data Modem

9: CPU 10: transmit amplifier

11: bus 12: rom

13: Sram 14: payphone card

15: Card slot 16: Slot

17: WLL terminal 18: handset

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

As shown in FIG. 2, the WLL terminal of the present invention connects the public telephone 1 with, for example, an RJ-11 port, and interfaces the communication signal and the charging information of the public telephone 1 with the above-mentioned. A codec 3 for converting an analog voice signal input through the interface unit 2 into a digital signal of a PCM method or a digital voice signal converted into an analog signal, and a character input through the interface unit 2; Data conversion unit 4 for demodulating analog public telephone management data in data form and restoring the digital data into digital data, and receiving and transmitting communication signals of the public telephone 1 and billing information according to the corresponding call from an external communication network. And an MSM 5 for processing public telephone management data transmitted and received through the data conversion unit 4.

As shown in FIG. 3, the data converter 4 receives a reception amplifier 6 for amplifying the public telephone management data input through the interface unit 2 to a predetermined level, and the reception amplifier 6. A data modem 8 for demodulating the analog public telephone management data output through the digital data and modulating the public telephone control signal of the radio switching system 7 into an analog signal, and a modulation / demodulation function of the data modem 8. A CPU 9 for controlling the operation, a transmission amplifier 10 for amplifying a public telephone control signal modulated by the data modem 8 to a predetermined level, and an application program through the bus 11 to the CPU 9. It includes a ROM 12 for providing a, and the SRAM 13 for storing the work processing data of the CPU (9).

In addition, the public telephone 1 has a card insertion opening 15 into which a public telephone card 14 can be inserted and an insertion opening 16 into which coins can be inserted.

Next, the operation and effects of the present invention as described above will be described.

In the operation of the present invention, first, when the user picks up the handset 18 from the payphone 1 connected to the WLL terminal 17 of the present invention and the payphone card 14 is the card insertion slot 15, the coin is the case. When each put into the coin inlet (16) tells the sound through the internal communication path. At this time, when the user presses the telephone number signal, the telephone number signal is processed to a certain signal and outputted to the WLL terminal 17 through the RJ-11 port.

Then, the interface unit 2 of the WLL terminal 17 interfaces with the analog signal transmitted from the public telephone 1 and outputs it to the codec 3. The codec 3 converts the input analog signal into a digital signal and outputs the digital signal to the MSM 5. In addition, the MSM 5 processes the RF signal of the input public telephone 1 and emits the RF signal as a radio signal. Then, the communication signal of the WLL terminal 17 is exchanged by the radio switching system 7 located in the adjacent area and transmitted to the counterpart telephone 20 through the PSTN network 19. At this time, when the user of the other party's telephone 20 receives the handset, the incoming call is transmitted to the public telephone 1 through the reverse process, so that a voice channel is formed between them. The public telephone 1 speaks its own desired voice through the formed voice channel, and this voice signal is transmitted to the WLL terminal 17. Then, the interface unit 2 of the WLL terminal 17 interfaces with the analog voice signal transmitted from the public telephone 1 and outputs it to the codec 3. The codec 3 converts the input analog voice signal into a PCM digital signal and outputs the same to the MSM 5. Then, the MSM 5 processes the RF signal of the input public telephone 1 and emits it as a radio signal. Then, the communication signal of the WLL terminal 17 is exchanged by the radio switching system 7 located in the adjacent area and transmitted to the counterpart telephone 20 through the PSTN network 19 to perform a normal call function.

Here, when the voice channel is formed as described above, the radio switching system 7 transmits metering pulse data to the public telephone 1 through the WLL terminal 17 until the end of the call.

The public telephone 1 counts the frequency information transmitted from the WLL terminal 17 during the voice call, calculates a rate using the count value, and then calculates a rate (coin). The public telephone card 14 pays the corresponding fee.

Here, the public telephone 1 converts the management data, such as public telephone management data, for example, call history, into an analog signal through a built-in data modem 8 at a predetermined time, for example, 12 pm, to the WLL terminal. Transfer to (17). Then, the interface unit 2 of the WLL terminal 17 interfaces with the input analog public telephone management data and inputs it to the reception amplifier 6 of the data conversion unit 4. Then, the reception amplifier 6 amplifies the public telephone management data input through the interface unit 2 to a predetermined level and outputs it to the data modem 8. At this time, the CPU 9 of the data converter 4 loads an application program in the ROM 12 to control the modulation / demodulation function of the data modem 8, and the data modem 8 is the CPU 9. The public telephone management data of the analog inputted through the reception amplifier 6 is demodulated into digital data and outputted to the CPU 9 in accordance with the function control. Then, the CPU 9 temporarily stores digital public telephone management data input from the data modem 8 in the SRAM 13 and outputs the digital public telephone management data to the MSM 5 through the serial port RS-232.

Here, since the public telephone management data is demodulated in the same manner as the data modem 8 of the public telephone 1, no signal distortion or loss occurs in the data in this process.

On the other hand, the MSM (5) is RF signal processing and transmits the public telephone management data input from the data conversion section 4 through the serial port to the radio switching system (7) and accordingly the radio switching system (7) The public phone is managed by referring to the public phone management data.

Here, the radio switching system 7 is to transmit the control data for controlling the public telephone. At this time, the control data is received by the MSM 5 of the WLL terminal 17, processed by a predetermined signal, and then output to the data converter 4. Then, the CPU 9 of the data converter 4 outputs the digital control data received through the serial port to the data modem 8. The data modem 8 modulates the input digital control data into an analog signal and outputs the same to the transmission amplifier 10. In addition, the transmission amplifier 10 amplifies the input analog control data to a predetermined level and transmits it to the public telephone 1 via the interface unit 2. Then, the public telephone 1 demodulates the input analog control data through the data modem 8 and executes a corresponding function according to the control data.

As described above, the present invention includes a data conversion unit capable of serial data processing in a WLL terminal, thereby processing public telephone management data transmitted between a public telephone and a public telephone management system, thereby distorting signal during transmission of public telephone management data. Since it is stably transmitted to the destination without a problem, the transmission stability of the public telephone management data is significantly improved.

In addition, according to the present invention, the public telephone management data is quickly transmitted to the public telephone management system through a pass different from the voice signal, or vice versa, thereby controlling the public telephone by controlling the public telephone, thereby maximizing the management efficiency of the public telephone. There are also effects that can be made.

Claims (3)

An interface unit for interfacing communication signals and charging information of a public telephone by connecting a public telephone, and converting an analog voice signal input through the interface unit into a digital signal of a PCM method or converting an input digital voice signal into an analog signal; A code converter, a data converter for demodulating analog public telephone management data in the form of text data input through the interface unit and restoring the digital data into digital data; and a communication signal of the public telephone and billing information according to a corresponding call from an external communication network. WLL terminal equipped with a public telephone management data transmission function comprising an MSM for receiving and transmitting and processing public telephone management data transmitted and received through the data conversion unit. The apparatus of claim 1, wherein the data conversion unit demodulates the public telephone management data input through the interface unit to a predetermined level, and demodulates the analog public telephone management data output through the reception amplifier into digital data and wirelessly exchanges them. A data modem for modulating the public telephone control signal of the system into an analog signal, a CPU for controlling the modulation / demodulation function of the data modem, a transmission amplifier for amplifying the public telephone control signal modulated by the data modem to a predetermined level, And a ROM for providing an application program through a bus to the CPU, and an SRAM for storing work processing data of the CPU. The WLL terminal according to any one of claims 1 to 3, wherein a serial port is connected between the MSM and the CPU.