JPH03284051A - Facsimile communication system - Google Patents

Abstract

PURPOSE:To prevent signal collision and to ensure smooth communication by sending a message confirming signal (MCF) just after reception of a succeeding multi-page signal (MPS) when the preparation of transmission of the MCF is not finished within a prescribed time after the reception of the MPS from an opposite station. CONSTITUTION:When the preparation of transmission of an MTF is finished within a prescribed time such as 3sec after the reception of MPF from an opposite station, an MCF is sent to the opposite station. On the other hand, when not finished, the MCF is sent after the end of reception of the succeeding MPF. Thus, occurrence of signal collision for 2nd and succeeding originals is prevented when the 2nd and succeeding originals are received and the facsimile communication system offering smooth communication ensurance is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a facsimile communication system, and more particularly to a facsimile communication system that can prevent malfunctions due to signal collision when receiving two or more original documents.

BACKGROUND OF THE INVENTION In recent years, facsimile communication has rapidly spread from business use to home use, and smooth and reliable communication connections are required.

FIGS. 3(a), 3(b), and 3(c) are time charts showing an example of a conventional facsimile communication system and its problems. When receiving two or more original pages, the other station (hereinafter referred to as the transmitting station) sends the original data for one page, and then
A multi-page signal (hereinafter abbreviated as MPS) is sent, and the own station (hereinafter referred to as a receiving station) that receives the signal sends out a message confirmation signal (hereinafter abbreviated as MCF) after completion of reception preparations. After receiving the MCF, the transmitting station feeds the next original to the reading position, sends out a training signal after completing preparations for sending the next original, and then sends out original data (image signal) (Figure 3 (a)).
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Problems to be Solved by the Invention However, the above conventional method causes the following problems. After transmitting the MPS, the transmitting station transmits the MPS again if the MCF is not transmitted after a certain period of time (approximately 3 seconds) in accordance with the CCITT recommendations. At this time, there is a possibility that the receiving station that has completed reception preparations will send out the MCF.

If this happens, MPS and MCF will collide, and the transmitting station will
The MPS cannot be captured, and the MPS is sent again at an interval of approximately 3 seconds. At this time, since the receiving station has already sent MCF once, it switches the modem to the high-speed signal side to wait for the training signal, which is a high-speed signal, and cannot receive the MPS, which is a low-speed signal (3rd
Figures (b), (c) l. Therefore, the receiving station cannot send MCF even if it receives MPS, and the sending station cannot receive MCF after all.According to the CCITT recommendation, if it cannot receive MCF even after sending MPS three times, it stops sending MPS and closes the line. I'll cut it.

The present invention solves the conventional problems as described above and provides a means for smoothly performing facsimile communication.

Means for Solving the Problems In the facsimile communication system of the present invention, after receiving the MPS, if the preparation for sending the MCF is completed within a preset time, the MCF is immediately sent, and if the preparation for sending the MCF is not completed within the time. In this case, there is a means of waiting for the next MPS reception to be completed and transmitting the MCF immediately after that.

Operation The present invention uses the above-described means to prevent the MCF from being sent and to transmit the next MPS signal from the partner station when reception preparation is not completed within a preset time when receiving the second and subsequent documents. To provide a facsimile communication system that can prevent signal collisions and ensure smooth communication by waiting for the transmission of MCF and immediately thereafter transmitting MCF.

Embodiment FIG. 1 is an operation flowchart of the receiving side of a facsimile communication system according to an embodiment of the present invention, and FIG. 2(a) is a flowchart of the operation on the receiving side.

(b) is a time chart of a facsimile communication system showing an embodiment of the present invention.

After the transmitting station sends out the MPS, the operations shown in FIG. 1 begin. First, the transmitting station transmits the image signal for one image and then sends it to the MPS.
Send out. After completing MPS reception (step 1), the receiving station starts a determination timer (step 2) and prepares to receive the next document (step 3). Then, the receiving station determines whether the reception preparation for the next document is completed within the preset time (step 4), and if the reception preparation is completed within the time (less than 3 seconds), the reception station immediately after the reception preparation is completed (step 4). If the reception preparation is not completed within the time, wait for the next MPS reception and immediately after the completion (
Step 5) Send the MCF (Step 6) (FIG. 2(b)).

Effects of the Invention The present invention provides an excellent facsimile communication system that prevents malfunctions due to signal collision when receiving the second and subsequent originals and allows smooth communication by using the means described above.

[Brief explanation of drawings]

FIG. 1 is an operation flowchart of the receiving side of a facsimile communication system according to an embodiment of the present invention, and FIG. 2(a) is a flowchart of the operation on the receiving side. 3(b) is a time chart of the same facsimile communication system, and FIGS. 3(a), 3(b), and 3(c) are time charts of the conventional example.

Claims (1)

[Claims] When receiving two or more originals from the other station, if the preparation for sending the message confirmation signal is completed within the preset time after receiving the multi-page signal from the other station, the message confirmation signal will be sent immediately. , and if it is not completed within the preset time, waits for reception of the next multi-page signal from the partner station, and sends a message confirmation signal immediately after the multi-page signal is completed. A facsimile communication method that allows