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Method for decreasing facsimile protocol frame collision

A technology of fax and fax terminal, applied in the field of fax

Inactive Publication Date: 2011-05-04
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the existing fax protocol is a half-duplex protocol, fax terminals cannot send and receive fax negotiation frames at the same time. Therefore, excessive fax delays can easily cause collisions of fax negotiation frames. For example, see Figure 3 As shown in Figure 3, due to excessive delay, the called party resends the DIS and the calling party responds The DCS collided during the transmission, which caused the fax to fail

Method used

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  • Method for decreasing facsimile protocol frame collision
  • Method for decreasing facsimile protocol frame collision
  • Method for decreasing facsimile protocol frame collision

Examples

Experimental program
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Embodiment Construction

[0028] see Figure 4 As shown, the method for reducing fax negotiation frame collision in this embodiment mainly includes the following steps:

[0029] Step 401: The fax transfer device sends the command frame received for the first time from the first fax terminal to the second fax terminal, and judges whether a response frame from the second fax terminal is received, and if so, executes step 402; otherwise , go to step 404.

[0030] Step 402: The fax relay device judges whether the time difference between the current time and the last received command frame from the first fax terminal is greater than the first delay time, if yes, execute step 403; otherwise, return to execute step 402.

[0031] Step 403: The fax relay device sends the received response frame to the first fax terminal, and ends the process of this flow.

[0032] That is to say, if the time difference between the current time and the last received command frame from the first facsimile terminal is not greate...

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PUM

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Abstract

This invention discloses a method of reducing fax consultation frame collisions, it sets up first delay time lasting and second delay time lasting. According to first delay time lasting, fax transit equipment adjusts the time that the second fax terminal consultation frame send to the first fax terminal. According to second delay time lasting, it adjusts the time that the first fax terminal consultation frame send to the second fax terminal. The invention of the proposed method can reduce fax consultation frame collisions, and improve the fax success rate.

Description

technical field [0001] The invention relates to facsimile technology, in particular to a method for reducing collision of facsimile negotiation frames. Background technique [0002] Facsimile communication is a communication method that uses scanning and photoelectric conversion technology to send static images such as text, pictures, and photos from the source to the receiving end through wired or wireless channels, and reproduce the still images at the receiving end. Since the 1970s, due to the opening of the file fax service on the Public Switched Telephone Network (PSTN), fax communication has been vigorously developed and has become one of the means for people to transmit information. [0003] see figure 1 As shown in the fax network diagram, the fax terminal on the PSTN side is directly connected to the PSTN network, and negotiates and communicates with other fax terminals through the PSTN network; the fax terminal on the mobile side is connected to the On the mobile...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/02H04N1/00H04M11/06
Inventor 赵庆学李毅张西军周卫强
Owner HUAWEI TECH CO LTD