JPS61256840A - Protocol adaptor for error correction - Google Patents

Abstract

PURPOSE:To add an error correction protocol function to a data terminal device by providing a data terminal device interface section, a buffer memory section, an error correction protocol adaptor processing either coding or decoding and executing an error correction protocol, and a line interface. CONSTITUTION:In an adaptor 4, a communication data B sent through a line 3 is received by a line interface section 9, the data is decoded by an error correction protocol adding section 8 to obtain a communication data A. When the reception is normal, after a central control section 10 of the error correction protocol adaptor 4 stores the communication data A into a buffer memory section 7, the section 10 sends the data to a data terminal device 5 via a data terminal device interface section 6 and sends a notice signal of the result of reception of communication data A to an error correction protocol adaptor 2. If the reception is not normal, the notice signal of the result of reception of communication data A is sent to the error correction protocol adaptor 2, which retransmits the communication data B when a retransmission request is given under the abnormal reception state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data communication device, and particularly to an error correction protocol adding device connected to a data terminal device that does not have an error correction function.

[Conventional technology]

Hitherto, there has been no independent error correction protocol addition device of this type, and there has been a demand for one.

[Problem that the invention seeks to solve]

Conventional data terminal equipment without a communication data error correction function cannot be used as is if noise is added to the communication line. In order to use it, there was a problem in that the data terminal device itself had to be modified and an error correction protocol had to be added.

[Means for solving problems]

In order to solve these problems, the present invention provides a data terminal device interface section to which a data terminal device without an error correction function is connected, a buffer memory section for temporarily holding communication data, and a communication data code. An error correction protocol addition unit that performs either encoding processing or communication data decoding processing and executes an error correction protocol, a line interface unit that transmits and receives communication data to and from the line, and controls each of the above units. A central control section is provided for controlling the central control section.

[Effect]

In the present invention, it is possible to perform error-correctable data communication by connecting a data terminal device that does not have an error correction function.

〔Example〕

FIG. 2 shows an outline of a data communication system to which an embodiment of the error correction protocol addition device according to the present invention is applied. In FIG. 2, 1 and 5 are data terminal devices, 2 and 4 are error correction protocol adding devices according to the present invention, and 3 is a line. The error correction protocol adding devices 2 and 4 are devices having the same configuration and the same functions. In FIG. 2, an error correction protocol addition device 2.4 transfers communication data from a data terminal device 1.5 that does not have an error correction function to a line 3.
The data is sent and received while correcting errors.

Next, the general operation of this data communication system will be explained. Communication data A output from data terminal device 1 is processed by error correction protocol adding device 2, converted into communication data B, and output to line 3. This communication data B is input to the error correction protocol addition device 4, processed, converted into communication data A, and input to the data terminal device 5.

Next, details of the error correction protocol addition device 2 are shown in FIG. In FIG. 1, 6 is a data terminal device interface section, 7 is a buffer memory section, 8 is an error correction protocol addition section, 9 is a line interface section, and 10 is a central control section. As shown in FIG. 1, error correction protocol addition devices 2 and 4 have similar configurations.

Next, the operation of the apparatus configured as described above will be explained. Communication data A from the data terminal device 1 is received by the data terminal device interface section 6 and stored in the buffer memory section 7 under the control of the central control section 10. Next, the communication data A stored in the buffer memory section 7 is sent to the error correction protocol addition section 8 under the control of the central control section 10 in accordance with the data transmission speed of the communication partner. The error correction protocol adding unit 8 converts the communication data A received from the buffer memory unit 7 into encoded communication data B,
It is transmitted from the line interface section 9 to the line 3.

The error correction protocol adding device 4 also sends the communication data B transmitted through the line 3 to the line interface section 9.
and decoded by the error correction protocol addition unit 8,
Obtain communication data A. If the reception is normal, the central control unit 10 of the error correction protocol addition device 4 transmits the communication data A.
After storing it in the buffer memory section 7, it is sent to the data terminal device 5 via the data terminal device interface section 6, and at the same time, a communication data A reception result notification signal is sent to the error correction protocol addition device 2. If reception is abnormal,
It is only necessary to transmit the communication data A reception result notification signal to the error correction protocol addition device 2.

The error correction protocol adding device 2 analyzes the received communication data A reception result notification signal, and if normal reception is completed, transmits the next communication data. If the request is for retransmission due to abnormal reception, the communication data B is retransmitted, and the error correction sequence in the error correction protocol addition device 4 is executed.

In this manner, in this embodiment, an error correction protocol function can be added to a data terminal apparatus that does not have an error correction function without modifying the data terminal apparatus.

〔Effect of the invention〕

As explained above, the present invention includes a data terminal device interface section to which a data terminal device without an error correction function is connected, a buffer memory section that temporarily holds communication data, and a communication data encoding process/communication data an error correction protocol addition unit that performs one of the decoding processes and executes an error correction protocol; a line interface unit that transmits and receives communication data to and from the line; and a central control unit that controls each of the above units. By providing a data terminal, an error correction protocol function can be provided to the data terminal equipment without modification, and a network without data terminal equipment can be easily constructed.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of an error correction protocol addition device according to the present invention, and FIG. 2 is a system diagram showing a data communication system to which this device is applied. 1.5...Data terminal device, 2,4...Error correction protocol addition device, 3...Line, 6...
Data terminal device interface section, 7...Buffer memory section, 8...Error correction protocol addition section, 9
... Line interface section, 10... Central control section.

Claims (1)

[Claims] A data terminal device interface section to which a data terminal device without an error correction function is connected, a buffer memory section that temporarily holds communication data, a process for encoding communication data into error-correctable data, and a process for encoding received communication data. A line that sends and receives communication data between the line and an error correction protocol addition unit that performs one of the processes of decoding data and executes an error correction protocol depending on the reception completion state of the decoded communication data. What is claimed is: 1. An error correction protocol addition device, comprising an interface section and a central control section for controlling each of the sections, and connects a data terminal device without an error correction function to perform error-correctable data communication.