JPS59117844A - Retransmitting system of simultaneous multiple address device - Google Patents

Abstract

PURPOSE:To attain retransmission in page unit when an error occurs by transmitting continuously a transmission original of plural pages to plural addresses through a common modulating and demodulating device, storing the address and its page having the notice of error and retransmitting them. CONSTITUTION:A simultaneous multiple address 10 is provided with a memory 12, an MODEM 11 and a control section 13 in common to each line, and with an amplifier 16 and a network controller NCU 15 at each line 14. The device 10 is connected to facsimile terminals FAX1-FAX8 applying multiple address to originals P1-P5. If an error occurs in the receiving of the originals P4, P5 by the FAX3, FAX2 or the like, an error message is transmitted from the corresponding terminal. The device 10 stores the returned page in error and its terminal name, disconnects the address and keeps transmission to the rest addresses. After the end of transmission, the device 10 recalls the stored address, uses the stored page as a head page, and transmits the page to the address sequentially.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a retransmission method for a simultaneous broadcasting device using a common modem (modulation/demodulation device), and particularly to one that enables retransmission in page units.

Prior Art and Problems Recently, various systems have been put into practical use as simultaneous broadcasting devices for simultaneously transmitting the same original to multiple destinations. For example, the simultaneous broadcasting device 10 configured as shown in FIG. ．． Simplify the control unit 13 (commonize it)
It is possible to reduce costs. 14 is each line, 15 is a network control circuit (NCU) for each line, and 16 is an amplifier. On the other hand, there is also a method in which the memory is common, but the control section 13, modem 11, and amplifier 16 are provided for each line 14 and NCU 15. We will call the former the common type and the latter the individual type.

By the way, in the common type broadcast device 10, since the multiple terminal facsimile devices connected to it operate synchronously, it is impossible to fall back by retraining in case of frequent image errors during transmission, and I have no choice but to take the step of resending it.

In other words, if a facsimile transmission is capable of point-to-point communication such as an individual type, it is possible to perform fall pack, which lowers the transmission speed of the modem and retransmits each time an error occurs at a destination terminal. But the first
In the common type broadcasting device 10 shown in the figure, the control unit 13 and modem 11 are common to all lines, so individual processing such as retransmission only to a certain destination terminal or setting the optimum transmission speed for the line can be performed. I can't. For this reason, the conventional procedure is to resend all pages by re-calling, but it is not efficient to parse all the pages and resend them if there is an error in receiving some of the multiple sheets of the transmitted original.

For example, as shown in Fig. 2, there are five transmission originals PI-P5, and the facsimile terminal FAX I"F that broadcasts them
When there were 8 AX3 units (8 lines), all pages P1 to P5 could be received without error with FAX+, but FAX+
2, an error occurred on the last page P5, and 78- occurred on the fourth page P4 and fifth page P5 in FAX a, and the terminal FAX2.2 where the error occurred. FAX3...
It is inefficient to resend all pages P1 to P5 to...

OBJECTS OF THE INVENTION The present invention enables page-by-page retransmission when an error occurs in a simultaneous broadcasting device that shares a modem.

Structure of the Invention The present invention continuously sends multiple pages of original documents to multiple destinations through a common modulation/demodulation device, and if an error notification is returned from the destination where an image quality error occurred during transmission, that destination is separated and the remaining pages are sent to the destination. In a retransmission method of a simultaneous broadcasting device in which transmission is continued to a destination and then retransmitted to a destination from which the error notification was sent, the page number to which the error notification was returned is stored in a memory for each destination as a retransmission first page, Thereafter, only the destination where the error notification was received is called again, and the destinations that have the same page to be retransmitted are searched and extracted in order of page number from the retransmission first page number for each destination stored in the memory, and the destinations are retrieved in order of page number. The present invention is characterized in that the corresponding pages of the transmitted manuscript are sequentially broadcast to each other, and this will be explained in detail below with reference to the illustrated embodiment.

Embodiment of the Invention FIG. 3 is a flowchart showing an embodiment of the present invention, in which the flow on the left side is during normal transmission, and the flow on the right side is during retransmission. The simultaneous broadcasting device 10 shown in FIG. 1 has eight lines 14 and can transmit to eight destinations at the same time, but the operator can specify more destinations. For example, the total number of destinations can be set to 40, It is possible to send the same manuscript to all recipients by broadcasting it in five batches. For this purpose, - simultaneous broadcast device 10
The processing when sending begins with searching for the intended destination. and,
After broadcasting (communication) to the first 8 recipients, check to see if there are any remaining recipients, and if there are (N), broadcast the same manuscript to the remaining recipients (
connect. Then, when the number of remaining destinations reaches O, it is checked whether all pages of the transmission document were successfully sent to all the destinations, and if they were successfully sent (Y), the transmission ends (END5).

In this way, in facsimile transmission, each facsimile terminal returns a signal indicating whether it was successfully received or not each time a page is sent, and the control unit 13 stores the signal corresponding to the terminal as shown in FIG. , Are all pages OK? The above check can be performed by reading this memory.

Are all pages OK? As shown in FIG. 2, if an error has occurred in part of the check, the process moves to retransmission processing. This is the first
In the broadcasting device shown in the figure, when an error occurs, subsequent pages are not sent to the terminal in question, and the NCU of the terminal's line is operated to disconnect the terminal. Since an error occurs, it is necessary to take some kind of abnormality processing. In this system, disconnection of the terminal is considered to be an abnormal process) and the transmission is interrupted. Therefore, the FA shown in Figure 2
If an error occurs on the 4th page P4 like in X3, FAX3
is separated, and the fifth page P5 is not sent. If an error occurs on the first page, the terminal will be disconnected immediately and no further pages will be sent. Therefore, it is sufficient for the memory to indicate whether normal reception or error has occurred to simply store the page that has received the error notification on a terminal-by-terminal basis. The retransmission process begins with storing the number of accumulated sheets. This accumulated number of sheets is the number of pages of the transmitted original, so it is "5" in this example. In the present invention, since not all originals are retransmitted to all lines in which an error has occurred, the retransmission first page is added to the information given to the memory 12, so that retransmission in page units becomes possible. This retransmission first page is the page with the smallest number among the pages in which an image quality error has occurred.

As mentioned above, the memory of the control unit 13 in FIG.
The page number can be determined by reading out the page number, and the page number is notified to the memory 12 as the retransmission first page i. When an image quality error occurs, to re-call (call by dialing) the destination, first call the destination (not limited to one) where the error occurred on the first page i, and at the same time The first retransmission page i is given to No. 12, page i is read from the memory, and it is broadcast to all the corresponding destinations. If the number of applicable destinations is 8 or less, this broadcast can be done once, but if the number of destinations exceeds 16, 24 (fixed), then 2, 3, etc. Each time a broadcast is performed, it is checked whether there are any remaining destinations, and if there are, the broadcast continues; if not, the next page is retransmitted.

On the next page, the page similarly searches for the destination of the error,
A call is made to the destination and the page is retransmitted.

Below, the same process is repeated until the number of accumulated pages is counted up, and the process ends when the retransmission page becomes the final page. However, even after retransmission, there are still error destinations, so in order to deal with it, the process returns to the beginning and the error page is returned. Check to see if there is a destination, and then start sending again (in this case, reduce the transmission speed). Resend is limited to 2 times.
That's the end, and I'll call it quits. In this way, by managing and retransmitting error pages for each destination, it becomes possible to retransmit page by page.

If you follow the retransmission processing flow in Figure 3, retransmission first page -1
, and resends (communicates) the fourth page P4 to them at the same time. If the number of destinations exceeds the number of lines, the same page will be communicated repeatedly, just like when sending, so every time you broadcast, the remaining destinations - 0? If it is no (N), it will be broadcast to the remaining recipients, and if it is yes (Y), it will proceed to resending the next page.
Before that, check whether the retransmission first page - number of stored pages (number of sheets - 5) is reached, and if no (N), process +1 and then yes (Y
) is repeated until the retransmission broadcast is reached. This retransmission process
Taking the state shown in the figure as an example, the fourth page P4 is communicated to FAX3, and the fifth page P5 is communicated to FAX2 and FAX3.
will be communicated (broadcast). However, FAXI without error
are not subject to retransmission at all.
, there is no retransmission of pages P+ to P3. Since retransmission is limited to two times, if retransmission is performed up to the number of accumulated pages, retransmission - 2 times? is checked, and if no (N), retransmission begins, and if yes (Y), retransmission ends (END).

Regarding retransmission, for example, the first retransmission may be performed at the same transmission speed as normal, but the second retransmission may be performed at a lower transmission speed, but it is also possible to retransmit at a constant transmission speed. do not have. This is because the error factor is not necessarily the transmission speed.

Effects of the Invention As described above, according to the present invention, page-by-page retransmission is possible in response to an image quality error in a broadcast device that cannot perform line-by-line fallback, which reduces waste.
There are advantages such as shortened retransmission time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a simultaneous broadcasting device, FIG. 2 is an explanatory diagram of an image quality error during simultaneous broadcasting, and FIG. 3 is a flowchart showing an embodiment of the present invention. In the figure, 10 is a broadcasting device, 11 is a modem (modulator/demodulator), 12 is a memory, 14 is a line, P1 to P5 are transmission documents, FAXI, FAX2, . . . are facsimile terminals. Applicant: Toshi Tsuji Representative Patent Attorney Co., Ltd. Minoru Aoyagi Figure 1 Figure 3

Claims (1)

[Claims] Send multiple pages of original documents to multiple destinations through a common modulation/demodulation device, and if an error notification is returned from the destination where an image quality error occurred during transmission, that destination is separated and transmission is continued to the remaining destinations. In the retransmission method of the simultaneous broadcasting device, which continues and then retransmits to the detached destination, the page number to which the error notification was returned is stored in memory for each destination as the first retransmission page, and then the page number to which the error notification was sent is stored in the memory for each destination. Recall only the destinations, search and extract destinations with the same page to be retransmitted from the retransmission first page number for each destination stored in the memory in order of page number, and sequentially retrieve the destinations corresponding to the transmitted document to these destinations. A retransmission method for a simultaneous broadcasting device characterized by broadcasting pages.