KR100186609B1 - Facsimile transmitting method - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

A communication apparatus using a general switched line communication network.

2. The technical problem to be solved by the invention

Provides a transmission method by specifying the lowest communication speed in a facsimile that performs transmission and reception when the data transmission speed is higher than the specified minimum communication speed, and otherwise resets the line.

3. Summary of Solution to Invention

In a communication device using a general switched line communication network, a method for transmitting data at a calling station transmits the sample data at a rate lower than the transmission rate when a transmission error occurs in the sample data having a predetermined transmission rate for a line on which a call is formed. When the transmission speed is lower than the minimum communication speed provided in advance, the formed line is blocked, and the line is reconfigured.

4. Important uses of the invention

Implement this to send and receive data at the minimum communication speed.

Description

Transmission method by specifying the lowest communication speed in the fax

1 shows a system block diagram of a conventional facsimile.

2 is a diagram illustrating a protocol processing flowchart of a conventional fax transmission and reception procedure.

3 is a process flow diagram for performing a transmission mode on the basis of the lowest communication rate specified in a fax according to an embodiment of the present invention.

4 is a flowchart showing a protocol processing procedure for the transmission and reception procedure of the fax of FIG.

* Explanation of symbols for main parts of the drawings

111: control unit 112: OPE

113: sensor unit 114: scanner

115: image processing unit 116: printing unit

117: modem 118: NCU

119: memory

The present invention relates to a facsimile, and more particularly, to a transmission method in which a call is formed and a transmission data is transmitted only at a minimum communication speed designated by a user.

FIG. 1 is a diagram showing the configuration of a conventional facsimile. The control unit 111 controls the overall operation of the facsimile transmission mode, the reception mode, and the copy mode according to a set program. In addition, the control unit 111 may include a program memory and a data memory or may be externally connected as shown by reference numeral 119. The program memory stores a transfer program, and the data memory temporarily stores data generated during program execution. OPE (Operating Pannel) 112 is composed of a key input means and a display means. The key input means of the OPE 112 generates data of a key pressed by the user to designate each mode and perform an operation of the designated mode, and outputs the data to the controller 111. In addition, the display means of the OPE 112 performs a function of inputting and displaying display data indicating an operation state of the system when the controller 111 performs each mode. The sensor unit 113 detects the presence or absence of an input document and print paper, and outputs the detected state signal to the control unit 111. The scanner 114 moves the input original and scans an image of the original and converts it into digital data. The image processor 115 converts and outputs the image signal provided by the scanner 114 into digital data. The print unit 116 prints the image data input from the image processing unit 115 and the modem unit 117 on a print sheet under the control of the control unit 111 and performing the reception mode and the copy mode. At this time, the print operation is performed by driving the print engine provided in the print unit 116. Under the control of the control unit 111, the modem 117 modulates and transmits the image data output from the image processing unit 115 according to the transmission type, that is, the standard of the facsimile. The image signal is demodulated in its original form so that the image processor 115 can process it. The network control unit (NCU) 118 is controlled by the control unit 111 so that a telephone line (Tip, Ring) forms a transmission and reception path of the modem 117.

2 is a diagram illustrating a protocol processing flowchart of a conventional fax transmission and reception procedure. Hereinafter, a detailed description will be given with reference to FIG. 2.

First, in FIG. 2, S is an abbreviation of Send, R is an abbreviation of Receive, and S is a signal transmitting side, and R is a called party.

In order to communicate between the calling party and the receiving party in the facsimile operation, the calling party typically requests the switching center for a communication line through a dialing process, and transmission and reception are performed through the assigned line.

Accordingly, when the calling station dials by the user, the calling station outputs a calling tone of 1100 Hz 500 ms (hereinafter referred to as CNG), and then, by the CNG, the receiving side calls a called station identification (hereinafter referred to as CSI) of 2100 Hz. ) The originating station then enters the CED and recognizes that a call has been established. In addition, the transmitting side transmits frame information by using non-standard facilities (hereinafter referred to as NSF), called subscriber identification (hereinafter referred to as CSI), and digital identification signal (hereinafter referred to as DIS). Sender to the receiver, determine the status of the receiving station, and then use the Non-Standard Set-up (hereinafter referred to as NSS), Transmitting Subscriber Identification (hereinafter referred to as TSI), and digital command signal ( After transmitting the frame information of Digital Command Signal (hereinafter referred to as DCS) to the receiver to determine the transmission / reception environment, finally, the transmission speed of the transceiver is finally determined through a training check (hereinafter referred to as TCF). .

The originating station initially delivers the fastest sample data and TCF to the receiving side and reports the receiving status at the receiving side. At this time, if the reception result is not good, the receiver informs the sender of the status with an error transmission frame (hereinafter referred to as FTT), and if the reception result is good, it is referred to as an acknowledgment frame (ConFirmation to Receive). Inform. Thus, when receiving the FTT, the calling party lowers the transmission rate by one step and transmits sample data and waits for the reception result. That is, the sample data is transmitted at the transmission rate of 9200bps to the transmission rate of 7200bps. On the other hand, when FTT is repeatedly received, sample data is transmitted up to a transmission speed of at least 2400bps.

On the other hand, the sender starts transmitting data at the rate at which sample data is transmitted to receive the CFR. After that, the transmission data is transmitted, the multi-page signal (hereinafter referred to as MPS) is transmitted, and a plurality of transmission originals are output, and when a message confirmation (hereinafter referred to as MCF) is authorized, the calling station is transmitted. Outputs a disconnected frame (hereinafter referred to as DCN) and the transmission and reception procedure is terminated. The track in which the arc is formed is in a state of rest.

When the calling party wants to communicate, it requests a line from the switching center and is assigned a route with the receiving party. The quality of the assigned line can sometimes be inadequate for communication. Normally, however, the facsimile will continue to retry until the CFR is received while slowing down the communication speed to ensure successful communication on sub-quality lines. In the worst case, the frequency is often lowered from 14.4 Kbps to 2400 bps. do.

In other words, a communication device using a general switched line communication network automatically lowers the communication speed when the line condition is not good. This is especially the case for long distance communication, and even if communication is successful, communication is excessively made at a low communication speed, resulting in a long communication time and a corresponding communication fee.

Accordingly, an object of the present invention is to provide a transmission method by specifying a minimum communication speed in a facsimile to perform transmission and reception when the data transmission speed is higher than a specified minimum communication speed, and otherwise reset the line.

In the communication device using a general switched line communication network to achieve the objects of the present invention, in the method of transmitting data from the originating station, when a transmission error occurs in the sample data having a predetermined transmission speed for the line on which the call is formed The sample data is transmitted at a rate lower than the transmission rate, and when the transmission rate is lower than a preset minimum communication rate, the formed line is blocked and the line is reset.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that like elements in the figures represent like reference numerals wherever possible.

As used herein, the term "lowest communication rate" is specified by a user and represents a minimum communication rate with respect to a transmission rate of data transmitted and received.

3 is a flowchart illustrating a process for performing a transmission mode based on a lowest communication speed designated by a facsimile according to a preferred embodiment of the present invention. Hereinafter, the present invention will be described in detail with reference to FIGS. 1 and 3.

In step 311, when the control unit 111 is set to the lowest communication speed mode based on the OPE 112, the control unit 111 displays communication speeds by the display means of the OPE 112. At this time, the communication speeds are 14.4Kbps, 1.2Kbps, 9600bps,…. , 2400bps. Thus, based on the lowest communication rate setting key for the user to select one of the communication rates, the lowest communication rate is set in steps 313 and 314.

In addition, when a facsimile, which is a communication device using a general switched line communication network, becomes a transmission mode in step 315, protocols transmitted based on a corresponding program occur. When CFR is applied in step 417 after the TCF process, communication is maintained at the currently set communication rate according to the transmission rate of the sample data. In step 318, the transmission service is performed. When the CFR is not received in the step 317 and the FTT is received in the step 319, the control unit 111 lowers the transmission rate for the sample data by one step in step 320, and sets the lowest communication speed and the transmission speed set in the lowest communication speed setting mode. Is compared. Thus, in step 321, when the transmission rate is one step lower than the lowest communication speed, step 321 transitions to step 315 to repeat the TCF process. In step 321, when the transmission speed is smaller than the minimum communication speed, the communication is stopped by cutting off the line on which the call is formed in step 322. Then, in step 323, the control unit 111 reassigns another line and attempts to communicate.

On the other hand, when the transmission mode is not in step 315, the facsimile performs the corresponding function in step 316.

4 is a flowchart illustrating a protocol processing procedure for the transmission and reception procedure of the facsimile of FIG. 3. Hereinafter will be described in detail with reference to FIG.

The series of protocol transmissions for dialing from the originating station to the receiving station and forming a call to output the CNG is the same as before. Thus, the transmitting station transmits NSF, CSI, and DIS frame information to the transmitting station, and the receiving station determines the transmitting and receiving environment by receiving and outputting the NSS, TSI, and DSC. This is the same as the conventional protocol transmission process.

The originating station then sends the sampling data, TCF, to the receiving station, and then transmits the transmission data from the receiving end at the communication rate currently set for the CFR response. In addition, the FTT response is lowered by one step, and then the communication is interrupted or returned to the TCF process by comparing the minimum communication speed set by the user with the current transmission speed.

As described above, if the line condition is not good at the lowest communication speed, communication is not progressed, and a call setup is requested to another line, thereby reducing the overall communication time and the communication fee accordingly, thereby improving communication efficiency. In particular, the transmission method according to the present invention is more effective when the reservation function is operated in the communication device including the memory function.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. In particular, in the embodiment of the present invention, the facsimile is illustrated, but the same method can be applied to a terminal using a general switched line communication network. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the appended claims, but also by the equivalents of the claims.

Claims (4)

In a communication device using a general switched line communication network, in a method for transmitting data from a calling station, when a transmission error occurs in sample data having a predetermined transmission rate for a line on which a call is formed, the sample data is lower than the transmission rate. The transmission method by specifying the lowest communication speed in the facsimile, characterized in that for transmitting the, and when the transmission rate is lower than the preset minimum provided communication rate, the formed line is blocked, and the line is reset. In a communication device using a general switched line communication network, a method of transmitting data from a calling station, the method comprising: checking a transmission state of transmission and reception of the data based on a predetermined transmission speed for a line on which a call is formed; When the transmission state is good, the data transmission step, and when the transmission state is bad in the check process, when the transmission rate is higher than the minimum communication rate provided in advance to the lower transmission rate than the transmission rate A process of returning to the data transmission / reception transmission state checking process according to the present invention; and if the transmission state is poor in the checking process and the transmission rate is lower than the minimum communication rate, blocking the formed call and resetting a line. Transmission by specifying the lowest communication speed in the facsimile Law. 3. The transmission according to the lowest communication rate designation in a fax according to claim 2, wherein in the checking process, a good state and a bad state of the transmission state are determined based on an acknowledgment signal and an error transmission signal from the receiving station. Way. In a communication device using a general switched line communication network, a method for transmitting data from a calling station to a receiving station, the method comprising: setting a minimum communication rate in the lowest communication rate setting mode at the calling station, and a sample having a predetermined transmission rate at the calling station. A ring data transmission process, outputting an acknowledgment signal when the receiving station receives the sampling data, and outputting an error transmission signal when the receiving result is not good; Transmitting transmission data when inputted; comparing the lowest communication rate with the transmission rate when the error transmission signal is input at the originating station; and when the transmission rate is higher during the comparison, Returning to the sampling data transmission process by having a low transmission speed And, when the transmission rate is low in the comparison process, ends the transmission mode and then resets the line.