KR100682050B1 - A Multi-Channel Data Transfer Modem - Google Patents

Abstract

The present invention relates to a multi-channel data transmission / reception modem, and in the field of wired / wireless data communication consisting of 1: 1, data is sequentially transmitted to a plurality of channels using a single modem chip through an adapter to which the circuit is applied. It can transmit and receive data with a single radio and system.

Multi Channel, Modem, Program ROM, Communication Control Unit

Description

Multi-Channel Data Transfer Modem             

1 is a block diagram showing the configuration of a multi-layer multi-channel data transmission and reception modem according to the present invention;

FIG. 2 is a block diagram illustrating an internal configuration of the program ROM of FIG. 1.

<Explanation of symbols on main parts of the drawings>

10: signal input channel 20: multiple response channel

30: program ROM 40: switching unit

50: time setting unit 60: communication control unit

70: signal generator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a modem used for wired / wireless data communication, and more particularly, to a multi-channel data transmission / reception modem capable of sequentially transmitting and receiving data through a plurality of channels using one modem chip.                         

In general, a modem is a device that converts (modulates) an analog signal into a digital signal (demodulation) so that a digital signal from a computer can be sent over a telephone line.

The telephone lines or leased lines we use are voice-grade, so when a digital signal passes, a lot of attenuation occurs, requiring a modem to transfer data between devices over 50 feet away. The modem can be largely divided into a transmitter and a receiver. The transmitter enters the modulator after the digital signal is input to the encoder and scrambled so that "1" or "0" is no longer output. Here, the carrier is modulated to a carrier frequency of about 1700-1800 Hz, transformed into an analog form, and then passed through a band-limited filter to the transmission line.

The receiving unit receives the frequency band of the desired part via the band limiting filter from the analog signal line, enters the automatic gain control (AGC), and divides it into an appropriate size. The analog signal is demodulated through a demodulator, converted into a digital signal, and then reduced back to the original data through a data decoder.

In addition, modems include external modems that can be connected to a computer through a serial or USB port, an expansion card type modem that can be plugged into an expansion slot of a PC, and a PCMCIA card type modem used in a notebook computer. Recently, not only data transmission and reception but also voice or fax transmission and reception functions are often provided, and a modem connected wirelessly as well as a wire is used.                         

However, in the conventional wired / wireless modems, since a single subscription network is formed on a single modem chip during data communication, communication is performed, and data transmission and reception are performed on only one channel, thereby making it difficult for multi-channel communication.

The present invention has been made to solve the above problems of the prior art, the object of which is to use a modem chip (modem chip) using a program and a switch to sequentially transmit and receive data in a plurality of channels To control a channel to provide a multi-channel data transmission and reception modem that can communicate in a plurality of channels.

According to a feature of the multi-channel data transmission and reception modem according to the present invention for solving the above problems, a signal input channel unit for receiving a data communication signal from the outside, and for transmitting each response signal according to the input data communication signal A program rom unit for detecting and selectively accepting signals input through the signal input channel unit and determining only one channel of the multiple response channel unit by internal programming, and outputting a decision signal; A switching unit for selecting a corresponding channel according to the determination signal of the ROM unit, a time setting unit for setting a time determined by channel determination in the program ROM unit, and transmitting the time to the multi-responder unit; A communication control unit for processing the control unit and outputting a control signal, and a control of the communication control unit. It generates a data signal corresponding to the arc is composed of a signal generator for output to the program and switching rombu.

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

1 is a block diagram of a multi-channel data transmission and reception modem according to the present invention. Channel 20; A program rom 30 for detecting and selectively accepting signals input through the signal input channel and determining only one channel of the multiple response channel by internal programming to output a decision signal; A switching unit 40 for selecting a corresponding channel according to the determination signal of the program ROM 30; A time setting unit (50) for setting a time by channel determination in the program ROM (30) and transmitting the time to the multiple response channel; A communication controller 60 for processing data signals in response to an input and a response of the program ROM 30 and outputting a control signal; The signal generator 70 generates a data signal corresponding to the control signal of the communication controller 60 and outputs the data signal to the program ROM 30 and the switching unit 40.

The program ROM 30 detects an input channel among the signals input from the first buffer 1 and the signal input channel 10 and applies the signal input from the channel according to digital transmission / reception, time and control signals to the communication controller. .                     

The signal input channel (10) includes a 232-driver (11) through which serial data communication signals are input through a second buffer (2); And an input channel switch 12 for selecting the 232-driver 11. The 232-driver 11 is an old standard that describes the physical connections and protocols for making relatively slow serial data communications between computers and related devices. The computer communicates data with other serial devices such as modems. Interface used to receive. Data from the computer is usually transferred from the interface to a built-in (or external) modem or other serial device by a chip on the motherboard. The data in the computer flows through parallel circuits, but since serial devices can only process one bit at a time, the chip on the motherboard is responsible for converting bits in parallel into a serial bit string.

The switching unit 40 may include a switch 41 for distinguishing an analog or digital signal of a determination signal output from the program ROM 30, a signal transmitted from the switch 41, and a signal generated by the signal generator. Accordingly, the analog / digital switch 42 selects the multiple response channel 20.

FIG. 2 is a block diagram showing a detailed configuration of the program ROM 30, which is a part of FIG. 1, and transmits and receives a digital signal to and from the input channel detection circuit 31 and the communication control unit. A switch 32, 33 for applying a signal of a channel and a channel decoder 34 for generating a clock while decoding the channel selected by the switch 33 are included.                     

Referring to the operation of the multi-channel data transmission and reception modem according to the present invention configured as described above are as follows.

First of all, the modem selects a port and channel for transmission and sends a signal, but when receiving, it is impossible to know which subscriber transmits first. Therefore, the modem first receives the signal first detected in the program through the 232-driver. Accept and block incoming signals afterwards. When receiving, it operates as above, but when giving a response, it can know the received channel to respond. Therefore, it controls the relay corresponding to the response channel to be opened in response through the program and logic circuit inside the program.

Upon reception, the program rom operates the transmit / receive driver of the communication control unit in accordance with an input channel detection circuit and a program rom logic circuit for finding out which portion acts as a switch and which input channel switch is operated.

At the time of transmission, communication is performed by operating the transmission / reception driver of the communication control unit through the response channel selection circuit and the program ROM logic circuit.

The multi-channel data transmission / reception modem of the present invention configured as described above uses a single modem chip (modem chip) to connect multiple devices in the field of wired / wireless data communication using a circuit in which data is transmitted to a plurality of channels. Can be transmitted and received sequentially to implement data communication with a single radio and system.

Claims (4)

A signal input channel unit to which a data communication signal is input from the outside; A multiple response channel unit for transmitting each response signal according to an input data communication signal; A program rom unit for detecting and selectively accepting signals input through the signal receiving channel unit and determining only one channel of the multi-response channel unit by internal programming to output a decision signal; A switching unit for selecting a corresponding channel according to the determination signal of the program ROM unit; A time setting unit for setting a time by channel determination in the program ROM unit and transmitting the time to the multiple response unit; A communication control unit for processing data signals in response to an input and a response of the program ROM unit and outputting a control signal; And a signal generator for generating a data signal according to a control signal of the communication controller and outputting the data signal to the program ROM unit and the switching unit. The method of claim 1, And the program ROM unit comprises an input channel detection circuit and a switch for transmitting digital transmission and reception, time and control signals to the communication control unit. The method of claim 1, The signal input channel section includes a 232-driver through which serial data communication signals are input; And a input channel switch for selecting the 232-driver. The method of claim 1, The switching unit comprises a switch for dividing an analog or digital signal of a decision signal output from a program ROM unit, and an analog / digital switch for selecting a multiple response channel unit according to the signal transmitted from the switch and the signal generated by the signal generator. Multi-channel transmit and receive modem, characterized in that.

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