KR960013266B1 - Modem data communication - Google Patents

Abstract

The apparatus allows to connect a modem capable of transmitting and receiving data between a data terminal connected to the analog circuit and other data terminal connected to the digital circuit. The apparatus includes a signal conversion circuit, a DCE/DTE conversion block, a timing control section, a power conversion circuit, a network connection block, a data interfacing block, a CPU, a memory unit, a tone generating unit, a keypad block, a LCD block, and speakers.

Description

Modem accessible data communication device and method

1 is a conventional digital data communication apparatus.

2 is a connection configuration diagram of a data communication device, an electronic switch and a PSTN according to the present invention.

3 is a detailed configuration diagram of a data communication apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

100A: data communication device A, 10A, 10: power conversion unit

100,110: data communication device B, 12A, 12: central processing unit

15A, 60A, 15, 60: Data line connection part 11A, 11: D channel control part

14A, 70A, 14, 70: data matching unit 13A, 13: memory device

16A, 16: tone generating unit 17A, 17: keypad

18A, 18 LCD part 20A, 20 network connection part

30: timing controller 40: signal converter

41: Combo unit 43: Impedance matching unit

44: two-four-wire converter 45,210: modem

50: DCE / DTE converter T: transformer

S: Speaker 200: Electronic exchanger

PSTN: Public Switched Network DTa, b, 1,2: Data Terminal

TC: Analog Rotational Connection DC: Digital Line Connection

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication apparatus and method, and more particularly, to a modem communication capable data communication apparatus and method for transmitting and receiving data between a data terminal connected to an analog line of an electronic switch and another data terminal connected to a digital line.

In the conventional digital data communication apparatus, as illustrated in FIG. 1, the power conversion unit 10A, the network connection unit 20A, the data matching units 70A and 14A, the data line connection units 60A and 15A, and the D channel control unit ( 11A), a central processing unit 12A, a storage unit 13A, a tone generating unit 16A, a keypad unit 17A, an LCD unit 18A, a transformer T, a speaker 5, and a data terminal. A and B (DTa, B) are connected to the data line connection portions DP1 and 2, respectively. The power converter 10A converts the power supplied from the transformer T for line characteristic impedance matching to the power required for the digital data communication device A 100A at the electronic exchange side. The network connection 20A generates a clock required for the digital data communication apparatus A 100A, maintains the synchronization of the data frames supplied from the electronic exchange using the PCC, and stores the data supplied from the electronic exchange. It converts the data according to the internal bus structure of the device A (100A) and converts the data supplied to the electronic exchange side according to the transmission path characteristics of the exchange. The D channel controller 11A processes data transmitted and received through 16kbPS D channel among 2B + D channels, and the central processing unit 12A processes data transmission and reception through the D channel of the D channel controller 11A, and the LCD unit 18A. All operations such as message display, tone generation of the tone generating unit 16A, state detection of the keypad unit 17A, information transmission and reception with the data terminal, control of the data matching unit, and the like are controlled. The data line connecting portions 60A and 15A match the signal levels of the data terminals A and B (DTEa, b) with the signal level inside the data communication device A 100A. The data matching unit 70A, 14A matches the data transfer rate difference between the data terminals A, B (DTa, b) and the B channel, and loads data from the data terminals A, B (DTa, b) on the B channel. The data from the electronic exchange side is supplied to each data terminal A, B (DTEA, B) through the B channel.

The conventional digital data communication device configured as described above performs data communication using a digital signal based on a preset data encoding method when performing data communication with another digital communication device through a digital line of an electronic exchange.

In general, data communication by PSTN is performed by converting digital data from each data terminal into analog data including carrier in modem by connecting modem and data terminal connected to modem to each analog line of PSTN. This is done by reaching the other party's data terminal after converting the modem into digital data. However, the electronic exchange only allows data communication between data communication devices connected to each line with digital and analog lines. The reason is that analog data including carriers converted from modems is connected to the analog line connection of the electronic exchange through the PSTN. When the data communication device connected to the digital line connection of the electronic switch via the digital line connection is reached, the reached data is analog data including carriers converted into digital data in the electronic switch, so unnecessary carriers are also digitally connected. This is because the data communication device via the analog line and the data communication device via the digital line cannot be connected to each other because they are converted into and included in this data. Therefore, the data communication between the conventional digital line data communication device and the analog line data communication device is impossible. If the data communication is to be possible, the analog data including the carrier transmitted on the analog line in the electronic exchange is converted into analog data and then the carrier and Finally, the problem that a separate device for converting pure analog data into digital data and transmitting it to a digital line must be provided.

The present invention has been made in view of the above problems, and since data communication with a terminal via an analog line is currently using a modem, the data structure modulated by the modem and the digital data matching structure are different from each other to improve communication. It is an object of the present invention to provide a modem-accessible data communication apparatus and method for enabling communication by having a modem-modulated data structure both at the destination and the source.

To achieve this goal, all analog data including carriers are converted into digital data in the electronic exchange, and the carrier components are removed and output from the digital data. When digital data without carrier components is supplied, the analog data is converted to carriers and converted into analog data. A DCE / DTE conversion unit for converting the pin arrangement of the data terminal port to a modem connection, and selectively connecting the data terminal port and the signal conversion unit to 2B channels. And a central processing unit for connecting to the 2B channel of the timing control unit and controlling pin array conversion of the DCE / DTE conversion unit according to a predetermined key input of a keypad unit. to provide.

The present invention also provides a first process of converting analog data including a carrier to digital data when a first data terminal connected to an analog line transmits data for communication with a second data terminal connected to a digital line; A second process of removing carriers and components from the converted digital data after performing the first process, a third process of removing carriers after performing the second process, and a second data terminal after performing the third process A fourth process of transmitting digital data for data communication with the first data terminal, a fifth process of adding a carrier component to the digital data transmitted after performing the fourth process, and a carrier component after performing the fifth process And a sixth process of converting the added digital data into analog data and transmitting the first data terminal. It provides itaconic communication method.

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

2 is a diagram illustrating a connection between a data communication apparatus according to the present invention, an electronic switch and a PSTN, and FIG. 3 is a detailed view of data communication according to the present invention.

2 shows a connection between the data terminals DT1 and DT2, the Public Switched Telephone Network (PSTN), the modems 45 and 210, and the modem 45 through the connection lines C-1 and C-2. The data supplied through the digital line C is converted to be suitable for transmission through the analog lines A1-n or selectively converted to transmission through the digital lines D1 to n. Digital line connection unit DC for connecting the data communication apparatus 100 for outputting data, the data communication apparatus 110 to which the data terminal DTa is connected instead of the modem, and the digital lines D1-n, c. And an analog connection unit (AC) for connecting an analog line (A1-n) and a line connection between the analog lines (A1 to n) or the digital lines (D1 to n), and the analog lines (A1-n) and digital lines It consists of an electronic switch 200 which selectively performs line connection between A and D and A / D and D / A conversion.

Detailed configuration diagram of the data communication apparatus according to the present invention is a power conversion unit 10, network connection unit 20, timing control unit 30, signal conversion unit 40, DCE / DTE conversion as shown in FIG. Section 50, data line connection section 60, 15, data matching section 70, 14, D-channel control section 11, central processing section 12, memory device 13, tone generating section 16, keypad The unit 17, the LCD unit 18, the transformer T, and the speaker 5 are constituted. The DCE / DTE conversion unit 50 changes the pin assignment to the data port 1 (Dp1) according to the DTE, and when the data terminal is connected to the data port 1 (Dp1), the pin assignment to the DCE is changed.

The timing controller 30 is connected to the data communication device connected to the analog line connection unit (AC) of the electronic switch 200, and the two B of the information bus of the 2B + D channel supplied through the network connection unit 20. The channels are provided to the modem analog port Mp and the data port 1 (Dp1), respectively, and connected.The two B channels are connected to the data port 1 during data communication through the digital line connection number (DC) of the electronic exchange 200. Connect to (Dp1) and data port 2 (Dp2). The signal converter 40 includes a combo unit 41 for converting analog data into another digital data according to the PCM coding method, or converting and filtering digital data into analog data, and an impedance matching unit for matching impedance characteristics of the analog signal. (43) and a two-four-wire converter 44 for changing two- or four-wire interface conditions according to the type of modem, and a modem analog port (Mp) and data port 1 (Dp1), respectively, to connect analog data. Is composed of a modem 45 for converting the digital data into analog data or the analog data. The central processing unit 12 includes a timing controller according to the key input of the keypad 17 and various control information supplied from the electronic exchange side. The interface setting of the channel and port selection 2/4 line conversion section 44 of 30, the pin layout conversion of the DCE / DTE conversion section 50, and the like are controlled. The description of the other components is the same as the description of the components of FIG.

Hereinafter, a data communication process between a data communication device connected to an analog line of an electronic switch and a data communication device connected to a digital line will be described in detail with reference to FIGS. 2 and 3.

The modem 45 is connected by two wires so that two B channels of the 2B + D channels are connected to the modem analog port Mp and the data port 1 Dp1 by the key input of the cap 17, respectively. Data terminal connected to the digital line connection (DC) of the electronic switch 200 from the data terminal 1 (DT1) connected to the PSTN with the pinout of the port 1 (Dp1) set to be suitable for connection with the modem. When 2 (DT2) is called and predetermined data is transmitted for data communication, the modem 210 converts the data into analog data and loads it on a broadcast wave to transmit to the PSTN side. When the analog data carried on the carrier is transmitted to the analog line connection part A of the electronic exchange 200 via the PSTN and the analog line A, the electronic exchange 200 converts both the analog data and the carrier into digital data and converts the digital data into digital data. The digital data is transmitted to the data communication apparatus 100 through one B channel of the 2B + D channels of the digital line C connected to the circuit connection unit DC, and control information such as a call signal is also transmitted through the D channel. It transmits to the communication device 100 side. The control information and the digital data are converted by the network connection unit 20 according to the internal coding type and the interface type of the digital communication apparatus 100 and supplied to the timing controller 30, and the D channel controller 11 is supplied from the timing controller 30. The control information is supplied to the central processing unit 12 by receiving the control information. After receiving this control information, the central processing unit 12 connects the inner B channel of the 2B channels to the modem analog port Mp and the other B channel of the data port 1 Dp1 in the order set by the key input. The channel control information is supplied to the timing controller 30 to control the DCE / DTE conversion unit 50 so that the pin assignment of the data port 1 (Dp1) is a pin assignment from the DCE to the DTE for the modem 45 connection. . The timing controller 30 supplies the digital data supplied from the network connection unit 20 to the combo unit 41 according to the supplied channel connection information, and does not use the data port 1 (Dp1) among the two B channels (B). Connect to the channel.

Thereafter, the combo unit 41 converts the supplied digital data into analog data, removes noise, and supplies the noise to the impedance matching unit 43. In this case, the converted analog data includes a carrier component. The analog data is supplied to the modem 45 through the 2/4 line converter 44, the modem analog port MP and the connection line C-1. The modem 45 receives the analog data, removes the carrier wave, converts the digital data into digital data, and converts the digital data through the connection line C-2, the data port 1 (Dp1), and the DCE / DTE conversion unit 50. It is applied to the line connecting portion A 60. The data line connecting unit A 60 converts the signal level of the applied digital data into the internal operation level of the data communication apparatus 100 and supplies it to the data matching unit A 70, and the level converted digital data transmits the B channel. The data is matched by the data matching unit A 70 at a speed and supplied to the timing controller 30. The timing controller 30 loads the digital data supplied to the usable B channel among the 2B channels under the control of the central processing unit 12, and supplies the digital data to the network connection unit 20. The network connection unit transmits the digital data to the electronic switch 200. The signal is converted into an encoding form suitable for the digital line and transmitted to the electronic switch 200 through the digital line C. FIG. The electronic switch 200 receives the digital data and supplies the digital data to the data communication device 110 through the digital circuit B. The data communication device 110 transmits the digital data to the data terminal 2 (DT2).

When data terminal 2 DT2 calls data terminal 1 DT1 and transmits predetermined data, the predetermined digital data via the digital circuit DB is transferred by the data communication apparatus 110 in the reverse order as described above. When the digital data is transmitted to the data communication device 110 via the digital line C by the electronic switch 200, the network connection unit 20, the timing control unit 30, and the data matching unit After converting the analog data including the carrier from the modem 45 through the A (70), the data connection A (60), the DCE / DTE converter (50), the data port 1 (Dp1), and the connection line (C-2) Digital data is converted through the connection line C-1, the modem analog port, the 2/4 wire conversion unit 44, the impedance matching unit 43, and the combo unit 41, and the timing controller 30 and the network connection unit 20 are converted into digital data. Then, it transmits to the electronic exchange 200 via the digital line (C). The electronic exchange 200 converts the digital data into analog data and transmits the analog data to the PSTN through the analog line A. Since the analog data is suitable for an analog line including a carrier wave, the data is transmitted through the PSTN and the modem 210. Transmit to terminal 1 (DT1). In this way, data communication is performed using the 2B + D channel between the data terminal 1 (DT1) via the analog line and the data terminal 2 (DT2) via the digital line.

As described above, the present invention is a data communication device connected to an analog line, a data communication device connected to a digital line, and a data communication connected to a digital line, in addition to mutual data transmission between data communication devices connected to a digital line of an electronic exchange. It also enables data communication with the device, thereby making it possible to achieve smooth and efficient data communication between the data device connected to the analog line and the data device connected to the digital line without installing a complicated and expensive device.

Claims (5)

In the data communication apparatus, when analog data including a carrier is all converted into digital data in an electronic exchanger and supplied, the carrier component is removed from the digital data and output. When digital data without a carrier component is supplied, the analog data is converted into analog data. A signal converter 40 for carrying on the carrier, a DCE / DTE converter 50 for converting the pin arrangement of the port for the data terminal to the modem 45, the port for the data terminal and the signal The timing controller 30 selectively connecting the converter 40 to the 2B channel, and the 2B channel connection and the DCE / DTE converter of the timing controller 30 according to a predetermined key input of the keypad 17. And a central processing unit (12) for controlling the pin array conversion of (50). The combo of claim 1, wherein the signal converter 40 converts the digital data including the carrier component into analog data, converts the analog data including the carrier into digital data, and removes and outputs a noise component. After removing the carrier from the analog data including the carrier and converting the data into digital data, the data is output to the data port 1 (Dp1) and the digital data without the carrier component supplied through the data port 1 (Dp1). A modem 45 for converting the data into analog data including a carrier wave and outputting the signal to the combo unit 41, and a 2/4 line converter 44 for converting a two-wire or four-wire connection according to the type of the modem 45; And an impedance matching unit 43 for matching impedance characteristics of analog data transmitted and received by the modem 45 and the combo unit 41. Data communication device possible. In the data communication method, the first data terminal connected to the analog lines A1 to n is connected to the analog data including the carrier wave for data communication with the second data terminal connected to the digital lines D1 to n. A second process of converting the data into digital data upon transmission, a second process of removing a carrier component from the converted digital data after performing the first process, and digital data from which a carrier is removed after performing the second process. A third process of transmitting to the data terminal, a fourth process of transmitting the digital data by the second data terminal for data communication with the first data terminal after performing the third process, and transmitting after performing the fourth process A fifth process of adding a carrier component to the digital data, and converting the digital data added with the carrier component to analog data after performing the fifth process to the first data terminal Modem connectable data communication method comprising: a sixth step that song. 4. The method of claim 3, wherein the second process comprises: a first step of converting the converted digital data into analog data; and a second step of removing carrier components from the converted analog data after performing the first step and converting the converted digital data into digital data again. And a third step of matching the transmission conditions of the second step with the second step. 4. The method of claim 3, wherein the fifth process comprises converting the transmitted digital data into analog data and adding a carrier component, and after performing the first step, analog data including carriers and components into digital data. And a third step of converting the converted digital data after performing the second step according to the transmission condition of the digital line (C).