JPS62264748A - Data processor - Google Patents

Abstract

PURPOSE:To attain the processing similarly at a data terminal equipment of any data transfer procedure by dividing a data extracted from the data terminal equipment into blocks each far shorter than a data block length of the data transfer procedure and storing them in a buffer. CONSTITUTION:A data blocking section 6 provided in a terminal equipment interface section 4 samples a data from a data terminal equipment 2 and devides the data into blocks each far shorter than the data block length of the data transfer procedure. The split data is stored n the buffer 5. An interval control section 7 scans the buffer 5 at an interval in response to the transmission speed of a data terminal equipment, and transfers the data block in the buffer 5 to a network control section 1. Thus, the similar processing of data is applied at any terminal of any data transfer procedure. Since the data is stored in the buffer and transmitted in a short length block unit, the delay is reduced.

Description

[Detailed Description of the Invention] [Summary] An asynchronous time division multiplexing local area network (
In order to perform data communication that does not depend on the data transfer procedure over a LAN (hereinafter referred to as LAN), the data processing device used between the network control unit and the data terminal or computer converts data from the computer or data terminal into a data block of the data transfer procedure. By dividing the blocks into shorter, fixed-length blocks and transmitting them to the network control unit, delays are reduced and data fluctuations are eliminated, allowing data communication to be performed with less software and without changing existing computer software. This is the data processing device that made it possible.

[Industrial application field]

The present invention does not depend on the data transfer procedure used between a network control unit and a data terminal or computer in order to enable data communication without changing existing computer software in an asynchronous time division multiplexed LAN. This invention relates to improvements in data processing devices for data communications.

As shown in FIG. 3, as a communication method for communicating between the computer 20 and the data terminals (which may also be computers) 27 to 29, there is a method using modems 21 to 26; Since a large number of .32 is required and the system is expensive, it would be possible to use an asynchronous time division multiplexing LAN to perform data communication that does not depend on the data transfer procedure, which would make it possible to replace existing computers and data terminals. This method is being considered because the system can be made inexpensive without any changes.

The transmission speed of an asynchronous time division multiplexed LAN is IMbp.
It is faster than s and allocates the right to use the transmission path only when there is a message to be sent to the terminal. It attaches the address of the other party and itself to the message block and turns it into a packet, making it possible to communicate with any other party. This is what I did.

Compared to the synchronous time division multiplexing method, this method is effective for data communication because it can use transmission paths more effectively and can transmit intermittent computer data in a short time.

This type of asynchronous time-division multiplexing LAN includes the 1985
The carrier sense multiple access collision detection method (hereinafter referred to as the C8MAZCD method), which was standardized in ISO and IEEE 802.3 in 2008, and the token bus method, which was standardized in 802.4.
There is a token ring method standardized in 02.5.

An example of a system using this will be explained using a diagram.

As shown in Figure 4, by using a C3MA/CD type bus type LAN and making use of existing computer software,
In order to enable data communication between the computer 20 and the data terminals 27 to 29, a bus 33 is connected to the
A high-level data link control procedure (hereinafter referred to as HDLC procedure) is performed between the network control unit 1 that performs network protocol control and the data terminals 27 to 29 or the computer 20.

Synchronous basic mode control procedure (hereinafter referred to as BSC procedure), start-stop synchronization non-procedure control procedure (hereinafter referred to as TTY)
LAN with a transmission speed of 300bps to 14.4Kbp's that does not depend on data transfer procedures such as
This is accomplished by providing a data processing device 3 that enables data communication that is much slower than the transmission speed of .

It is desirable that the data processing device 3 uses a small amount of software, has little data delay, and has no data fluctuation.

[Prior Art and Problems to be Solved by the Invention] FIG. 5 is a block diagram mainly showing a conventional data processing device 3. As shown in FIG.

In the figure, 1 is a network control unit that controls the network protocol, 2-4 is a data terminal, 3 is a data processing device, 4 is a terminal interface unit, 5 is a buffer, 8 is an interface unit, 9 is a system bus, 10 is a microprocessor, 11 is a ROM with a control program, 12 is a RAM, 13 is a LAN control circuit that controls the LAN protocol, 14 is a local bus, 15 is a RAM that can be accessed from both sides, and 16 is an ESC procedure compatible circuit. , 17 is HD
LC procedure compatible circuit; 18 indicates a TTY procedure compatible circuit;

In this case, the data processing device 3' includes a BSC procedure compatible circuit 16. which is a circuit corresponding to each data transfer procedure.
HDLC procedure compatible circuit 17. If the data transfer procedure of the system is, for example, the ESC procedure, the data terminal 2-4 is connected to the terminal interface unit 4' having the TTY procedure compatible circuit 18, and has the BSC procedure compatible circuit 16.

Of course, in the case of a computer, it goes without saying that it is connected to a terminal interface section that has a circuit that supports the data transfer procedure.

In this way, the data sampled from the data terminal 2-4 by the interface unit 8 is stored in the buffer 5, passed through the BSC procedure compatible circuit 16, and sent to the RAM 15 of the network control unit 1 via the bus 9. , are sent to the bus via the LAN control circuit 13 under the control of the microprocessor 10.

Input data from the bus is stored in the RAM of network control unit 1.
15 to the data processing device 3'', where it is sent to the buffer 5 of the terminal interface section 4° via the BSC procedure compatible circuit 16 via the bus 9, and the data is sent via the interface section 8. It is sent to terminal 2-4.

In this way, data communication that does not depend on the data transfer procedure is performed in an asynchronous time division multiplexing LAN, but in any procedure, the length is variable, generally about 2 to 4 bytes. Since the data block is packetized and transmitted in units of data blocks, the length of the data block is long, and since both the transmitting and receiving sides store this in the bath sofa 5 and transmit it, the data delay is large, and since the length is variable, there is a difference in delay time. There is a problem in that fluctuations occur.

If these are large, the computer software must be changed to accommodate them, and the existing system cannot be adapted to the asynchronous time division multiplexed LAN.

In order to prevent this, a method has been considered in which the entire data transfer procedure is interpreted and communicated within the data processing device, but this method requires a large amount of software and has the problem of being expensive.

[Means for solving problems]

The above problem is solved as shown in the principle block diagram of FIG. A terminal interface section 4 having a data blocking section 6 and an interval control section 7 that scans the buffer 5 at intervals according to the transmission speed of the data terminal and transfers data blocks in the buffer 5 to the network control section 1. This problem is solved by the data processing device 3 of the present invention configured.

[Effect]

According to the present invention, the data extracted by sampling from the data terminal or computer 2 by the interface section 8 of the terminal interface section 4 is processed into data blocks of the data transfer procedure by the data blocking section 6 regardless of the data transfer procedure. The data in the buffer 5 is divided into blocks of a constant length, which is much shorter than the original length, and stored in the buffer 5.The data in the buffer 5 is scanned by the interval control unit 7 at intervals according to the transmission speed of the data terminal so that the blocks are transmitted without delay. Since the block is transferred to the network control unit 1, the delay is very small, and since the length is constant, there is no fluctuation, and there is no need to change the existing computer software. The amount will also be very small.

〔Example〕

FIG. 2 is a block diagram mainly showing the data processing device of the present invention.

In the figure, 2-1.2-2.2-3 is a data terminal, 3 is a data processing device, 4-1 4-2.4-3 is a terminal interface section with the same contents, 6 is a data blocking section, and 7 is an interval The same reference numerals indicate the same functions throughout the invention.

The difference between FIG. 2 and FIG. 5 is that the circuits 16 to 18 corresponding to each procedure in FIG. 5 are not used, and the data terminal (or computer) 2-1, 2-2, For example, if there are three -3s, the terminal interface section 4-1.4-
2.4-3 and, for example, when data extracted from the data terminal 2-1 by sampling at the interface unit 8 is stored in the buffer 5, the data block length of the data transfer procedure is set at the data blocking unit 6. The interval control unit 7 transfers the data blocks without delay in accordance with the transmission speed of the data terminals 2-1 to 2-3. The buffers 5 of the terminal interface units 4-1 to 4-3 are scanned at possible intervals via the bus 9, and the data blocks stored in the buffers 5 are transferred to the RAM 15 of the network control unit 1 without delay. It is a point.

The data block of a certain length sent in this way is sent to the other party's computer or data terminal, and becomes a data block for a data transfer procedure, and data communication is performed.

In this way, the data extracted by sampling from the data terminal 2-1 is divided into data blocks of a fixed length, which is much shorter than the data block length of the data transfer procedure, and is stored in the buffer 5 and transmitted. It can be processed in the same way even in the case of a data terminal in the transfer procedure, and since it is stored in the buffer 5 in short data blocks and transmitted, there is less delay, and since it is a fixed length, there is no fluctuation, and existing computer software can be changed. It can be applied to an asynchronous time division multiplexed LAN with simple software.

〔Effect of the invention〕

As explained in detail above, according to the present invention, data communication can be performed by applying it to an asynchronous time division multiplexed LAN using less software and without changing existing computer software in any data transfer procedure. It has the effect of allowing you to do this.

[Brief explanation of drawings]

Figure 3 is a block diagram of an example of a system using a modem; Figure 4 is a block diagram of an example of a system using a LAN; Figure 5 is a block diagram centered on a conventional data processing device. be. In the figure, 1 is a network control unit, 2 is a data terminal or computer, 2-1 to 2-4 are data terminals, 3.3 is a data processing device, 4.4-1.4-2.4-3. 4" is the terminal interface section, 5 is the buffer, 6 is the data blocking section, 7 is the interval control section, 8 is the interface section, and 9 is the system bus. The amount of deno processing and the middle part of the Yabuhige 1J of the month of 亞亦口 (
Mr. Block 2 to 1,000 2 (2) IL Korikoriko Day 7 to 2 Riwa J to 1 A, look at ゛Rotsuf Kuniku 5

Claims (1)

[Claims] In order to perform data communication independent of data transfer procedures in an asynchronous time division multiplex local area network,
In a data processing device (3) used between a network control unit (1) that controls network protocols and a data terminal or computer (2), an interface unit (8) processes data from the computer or data terminal (2). Sample and buffer (
5) a terminal interface unit (4) having a data blocking unit (6) that divides the data into blocks of a certain length when storing the data; and a terminal interface unit (4) that scans the buffer (5) at intervals according to the transmission speed of the data terminal; A data processing device comprising: an interval control section (7) that transfers data blocks in the buffer (5) to the network control section (1).