JPH0285947A - Data transmission system - Google Patents

Abstract

PURPOSE:To reduce the load of a high-speed circuit and to prevent a transmission waiting state of the software data that is caused at a host computer by storing the data having the same contents as the software data stored in the host computer via a repeating device. CONSTITUTION:The data having the same contents as the software data stored in a host computer 3 are stored in a repeating device 2. The computer 3 gives an answer to show whether the receiver of data is equal to its own device or the device 2 in response to the inquiry given from a terminal 1. Then the device 2 is designated as the receiver of data as long as the device 2 has no trouble. The device 2 inquires the computer 3 about the incapability for transmission of data to the terminal 1 in response to the inquiry given from the terminal 1. Then the data is stored in a memory means 14 of the terminal 1. As a result, the load of a high-speed circuit is reduced and a transmission waiting state of the software data caused at the computer 3 can be avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a banking system, which is an electronic computer system with a large number of terminals. In particular, the present invention relates to a method for transmitting software data from a host computer to a terminal via a relay device having a line concentrator.

〔overview〕

The present invention provides a system for transmitting software data from a host computer to a terminal via a relay device having a line concentrator, in which the relay device stores data with the same content as the software data stored in the host computer. This reduces the burden on high-speed lines and prevents the host computer from waiting for software data transmission.

[Conventional technology]

In computer systems with a large number of terminals, relay devices with line concentrators are installed to reduce line costs and simplify network maintenance. In the conventional example, when transmitting software data from the host computer 3 to the terminal 1, the relay device 2 was passed through, and the software data was directly transmitted between the host computer 3 and the terminal 1.

[Problem that the invention seeks to solve]

In such conventional examples, when the number of terminal devices increases, the load is placed on the high-speed line between the relay device and the host computer, causing a wait for software data to be transmitted to the host computer, and as a result, the software is sent to the terminal device. This method has the disadvantage that it takes a long time to transmit data, which causes operational inconvenience.

The present invention aims to eliminate such drawbacks, and provides a data transmission method that reduces the load on the high-speed line between the relay device and the host computer and does not cause delays in transmitting software data to the terminal device. purpose.

[Means for solving problems]

The present invention includes a computer having a first storage means for storing data whose content is software, a terminal having a second storage means for storing transmitted data, and a terminal connected to the computer by a high-speed line, and connected to the terminal by a high-speed line. In a data transmission method including a relay device connected by a concentrator line and having a concentrator multiplexing means, the relay device has a third storage means for storing data stored in the first storage means in parallel. , the computer includes first means for specifying either the first storage means or the second storage means as a data transmission source to the terminal in response to an inquiry from the terminal; and a second means for specifying whether or not data can be transmitted from the relay device to one of the terminals according to the timing, and the terminal requests transmission of data from the data transmission source indicated by the first means. It is characterized by having a third means.

[Effect]

In advance, the relay device stores data with the same content as the software data stored in the host computer. In response to an inquiry from a terminal, the host computer answers whether the data transmission source is its own device or a relay device. If there is no problem with the relay device, the relay device is designated as the transmission source.

In response to an inquiry from a terminal, the relay device inquires of the host computer whether data transmission to this terminal is prohibited, and stores the data in the storage means of the terminal.

This reduces the burden on high-speed lines and prevents the host convenience store from having to wait for data transmission.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
4 through 4 are block configuration diagrams showing the configuration of this embodiment.

As shown in FIG. 1, this embodiment includes a terminal 1, a keyboard 11 connected to the terminal 1, and a human-powered device for starting and ending software data transmission and for making various inquiry requests regarding software data transmission. , a disk device 14 which is a storage device that stores terminal-side file management information (latest file ID, capacity, status display, etc.) and received software data, and an output device that displays transmission results, warning messages, and inquiry information. a graphic display 12, a printer 13, a relay device 2, a disk device 21 connected to the relay device 2 and serving as a storage device in which software data transmitted from the host computer 3 is stored, and the host computer 3.
, a keyboard 32 which is a human-powered device connected to the host computer 3 and used to interrupt and terminate software data transmission and input various inquiry requests; management information on files on the host computer 3 side; management information on the relay device 2 side; A disk device 31 is a storage device in which management information for software data transmission and software data to be transmitted is stored, and a graphic display 3 is an output device for displaying transmission result warning messages and inquiry information.
3 and a printer 34. Here, as shown in FIG. 2, the terminal 1 includes a first data transmission start processing unit 10.
1, a terminal side file information management section 102, a first data transmission management information acquisition section 103, a first file unit start processing section 104, a first data storage section 105, and a first file unit end processing section 106. , a first data transmission end processing section 107, a first transmitting section 108, and a first receiving section 109.
Equipped with.

Further, as shown in FIG. 3, the relay device 2 includes a second data transmission start processing unit 201, a second terminal side file information acquisition unit 202, a relay device file information acquisition unit 203, and a second data transmission management unit 201. Information acquisition section 204, second file unit start processing section 205, second data storage section 206, second data input section 207, second file unit end processing section 208, and second data transmission end processing section 209 , a second receiving section 210 , a second transmitting section 211 , and a third transmitting section 21
2 and a third receiving section 213. Further, as shown in FIG. 4, the host computer includes a fourth data transmission start processing unit 301 and a fourth terminal side file information acquisition B502.
, a relay device side file information management section 303 , a fourth host side file information management section 304 , a data transmission management information management section 305 , and a fourth file unit start processing section 306
, transmission propriety determination section 307 , and fourth data human resources section 30
8, a fourth file unit end processing section 309, a fourth data unit end processing section 310, a fourth receiving section 311,
and a fourth transmitter 312.

That is, this embodiment includes a computer 3 having a disk device 31 as a first storage means for storing data containing software, and a terminal having a disk device 14 as a second storage means for storing transmitted data. 1, and a relay device 2 connected to the host computer 3 via a high-speed line 5, connected to the terminal 1 via a concentrator line 4, and having concentrator/multiplexing means; It has a disk device 21 which is a third storage means for storing data in parallel, and the host computer 3 stores either the first storage means or the second storage means in response to an inquiry from the terminal 1. a first means for specifying one of them as a data transmission source to this terminal 1; and a second means for specifying whether data transmission from this relay device 2 to one of the terminals is possible in response to an inquiry from the relay device 2. The terminal 1 has a third means for requesting data transmission from the data transmission source indicated by the first means.

Next, the operation of this embodiment will be explained. FIG. 5 is a flowchart showing the software data transmission procedure between the host computer and the relay device, and FIG. 6 is a flowchart showing the software data transmission procedure between the relay device and the terminal.

When the connection process is completed, the start process (step Sl) of the relay device 2 is started, and a software data transmission start request is sent to the host computer 3 (step 32).
. When the host computer 3 receives this request message,
The start process (step S3) on the host computer 3 side operates and returns a response message (step S4). Relay device 2
Upon receiving this response message, the host computer 3 sends a start processing request for each file (software data) to the host computer 3 (steps S5 and S6), and the host computer 3 determines whether there is software data to be transmitted to the corresponding relay device 2. The response message is added to the response message and transmitted to the relay device 3 (steps S7 and 38). When it is determined that there is software data to be received by the relay device 2, software data transmission processing between the relay device 2 and the host computer 3 is started (steps S9 and 510), and as a result, the disk device 31 of the host computer 3 is The software data stored in is stored in the disk device 21 of the relay device 2 (step Sl
l and 512). When the transmission process of all the software data in the file is completed, the end process for each file (steps 313 and 514) is performed, and if all the files have been completed (steps S15 and 516), the end process of the software data transmission process (step 317 and 519)
and outputs the results to the graphic display 33 or printer 34 (step 520). On the other hand, if it is determined that there is no data to be received, the process ends without performing the software data transmission process between the relay device 2 and the host computer 3 (steps S17 and 519).
Then, the result is output to the graphic display 33 or printer 34 (step 520).

Next, when a software data transmission start request is input from the terminal engineer's keyboard 11 (step 551)
, in the start process on the terminal 1 side (step 552), the terminal 1
The side file management information (latest file ID, status display, etc.) is added to the software data transmission start request message and sent to the host computer 3 (step 853).

When the host computer 3 receives this start request message, the host computer 3 side starts processing (step 554).
operates, but at that time, the host computer 3 acquires the file management information on the terminal 1 side that was added to the start request message, and sends the data transmission management information (
A data transmission start response message is sent to terminal 1 (step 55
5). Terminal 1 receives this start response message, acquires data transmission management information, and receives an instruction as to whether to receive software data from host computer 3 or relay device 2. Here, the disk 21 of the relay device 2
If software transmission cannot be performed with the relay device 2 due to a failure or the like, software data transmission is performed with the host computer 3 in a conventional manner to prevent software data transmission from being interrupted.

Upon receiving the instruction to receive from the relay device 2, the terminal 1 starts processing to start via the relay device (step 556).
The relay device 2 sends a start request message via the relay device to the relay device 2 (step A37), and upon receiving this, the relay device 2 performs the start process (step A37).
Step 858) is started and the host computer 3 is notified (Step 559). host computer 3
Now, when this notification is received, the file capacity held by the terminal 1 side that sent the relay device start message is transferred to the software stored on the relay device 2 side as a - process of the relay device start process (step 860). Determining whether the capacity of the data file can be accommodated (step 561)
and notifies the relay device 2 of the determination result and the software data file ID to be transmitted (step 562).

If it is determined in this judgment that the file (software data) cannot be transmitted, a predetermined output device (graphic display 33 or printer 34 connected to the host computer 3, graphic display connected to the terminal 1) Steps S76 and 582) to output a warning message to printer 12 or printer 13).
, performs termination processing (steps S77, S79 and 581) and ends. On the other hand, determination of whether transmission is possible (step 36)
If it is determined that transmission is possible in step 1, software data transmission after this relay device start processing (step 560) is performed on the terminal 1 side and the relay device 2 side, avoiding monopolization of the host computer 3 and high-speed line 5. do.

When terminal 1 receives an instruction from relay device 2 that software data transmission is possible (step 563), terminal 1 sends a start request in file (soft data) units to relay device 2 (steps 364 and 365), and relay device 2 receives the request.
However, the start process (step 566) for each file (software data) is performed, the software data is retrieved from the disk device 21 of the relay device 2 (step 570), and the software data transmission process (step 570) is performed between the relay device 2 and the terminal 1 (step 570).
Steps 868 and 569) are performed, and as a result, the software data is stored in the disk device 14 on the terminal 1 side (step 571). When the transmission process for all data in the file is completed, a file-by-file termination process (steps S72 and 573) is performed, and if all files have been completed (steps S71 and 575), software data transmission termination process (step 377, S79 and 5
81) is performed, and the results are output to the graphic display 33 and printer 34, which are output devices on the host computer 3 side, and to the graphic display 12 and printer 13, which are output devices on the terminal 1 side (step S
76 and 582).

〔Effect of the invention〕

As explained above, even if the number of lines of relay equipment increases due to an increase in the number of terminal devices, the present invention does not place a load on the high-speed line between the host computer and the relay equipment, and the transmission time is significantly reduced. This has the effect of shortening the time. In addition, by storing software data on the relay device side,
Since the host computer side and the software data are duplicated, software data can be transmitted even if either side becomes a failure, which has the effect of improving reliability.

-ku, 4...concentration line, 5...high speed line, 11.3
2... Keyboard, 12.34... Graphic display, 13.34... Printer, 14.21
．． 31...Disk device.

Claims (1)

[Claims] 1. A computer having a first storage means for storing data whose content is software, a terminal having a second storage means for storing transmitted data, and a terminal connected to the computer by a high-speed line. and a relay device connected to the terminal via a concentrator line and having concentrator multiplexing means, the relay device having a third memory for storing data stored in the first memory means in parallel. means for specifying either the first storage means or the second storage means as a data transmission source to the terminal in response to an inquiry from the terminal; and the relay. It has a second means for specifying whether or not to transmit data from the relay device to one of the terminals in response to an inquiry from the device, and the terminal transmits data from the data transmission source indicated by the first means. A data transmission method characterized by having a third means for requesting transmission.