JPH0221755A - Pseudo transparency transmission system - Google Patents

Abstract

PURPOSE:To attain transparency transmission very easily and surely by providing a specific conversion table and an inverse conversion table. CONSTITUTION:In the presence of a transmission data 11, a code (01(16), 76(16)) coincident with a code 5 before conversion at the sender side is checked one by one byte each, a coincident code is converted into a pseudo transparent identification code (76(16)+(21(16), 34(16)) after conversion at the sender side to constitute a transmission data 12, and the result is sent. The reception data 13 is checked one by one byte and in the presence of a pseudo transparent identification code (76(16)), the code is eliminated and the succeeding code (21(16), 34(16)) is converted into the code (01(16), 76(16)) after the inverse conversion at the reception side corresponding to the code 7 before the inverse conversion at the reception side to form a reception data 14. Thus, the data of any code is able to be sent.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a transmission method for basic transmission control procedures, and in particular, a pseudo-transparent transmission method that allows transmission even if code data to be transmitted includes a code that matches a transmission control code. Regarding.

[Conventional technology]

Conventionally, this type of transmission system has had to use a high-level data link control (HDLC) procedure or a procedure using a data link escape code (DLE code) among basic procedures.

[Problem to be solved by the invention]

The above-mentioned conventional system can be implemented using frame synchronization or synchronous type communication line equipment as a communication device. Start-stop synchronization communication line (12008 public line)
(e.g., used below PS), there is a condition that the code data that can be transmitted is a code that does not match the transmission control code due to restrictions on the transmission control procedure, and there is a drawback that binary data cannot be transmitted.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pseudo-transparent transmission system that eliminates the above-mentioned drawbacks and can realize a transparent transmission system extremely easily and reliably.

[Means to solve the problem]

The pseudo-transparent transmission method of the present invention includes a conversion table that converts a code that matches a transmission control code into a code that can be transmitted as a data code, and a reverse conversion table that converts the code converted by the conversion table back into the code before conversion when received. It is realized by having a conversion table and performing transparent transmission according to a basic transmission control procedure.

〔Example〕

Hereinafter, the present invention will be explained with reference to the drawings.

1(a) and (b) are explanatory diagrams of a conversion table and an inverse conversion table showing an embodiment of the present invention. In FIG. The correspondence for converting transparent identification code 2 from pre-conversion code 5 to post-conversion code 6 is shown.In addition, in the same figure (b), the inverse conversion table shows the converted code 7.
The following shows how to inversely transform the code into the original code 8. Note that 3 corresponds to code 1 above, and 4 also corresponds to code 2.

FIG. 2 is an explanatory diagram showing operations of conversion and inverse conversion.

In the same figure, when there is transmission data 11, the code (01 (16)
, 76 (16J), and the matching code is the pseudo-transparent identification code (76 (+6)) plus the post-conversion code on the sending side (
21,(,su,34(16)) to form transmission data 12 and transmit it. On the receiving side, the received data 13 is examined one byte at a time, and a pseudo-transparent identification code (76 (16)
), that code is removed and the next code (21
(lr,),, 34 (16)) is converted into a code after inverse transformation on the receiving side (01(1
6J, 76 (16)) and set as received data 14. Note that the post-conversion code 6 can be set to any code that does not match the pseudo-transparent identification code and the transmission control code.

In this way, a transparent transmission system that can transmit data of any code can be realized.

〔Effect of the invention〕

As explained above, the present invention uses a basic transmission control procedure to process pseudo-transparent transmission at a 10-gram pseudo level in an asynchronous line where special communication equipment for transparent transmission is not provided and transparent transmission procedures cannot be applied. There are effects that can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conversion table showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a conversion operation. 1... Code that matches the transmission control code, 2... Identification code, 5... Code before conversion, 6... Code after conversion, 11... Transmission data, 12... Data after conversion, 1
4... Received data.

Claims (1)

[Claims] Basic transmission includes a conversion table that converts a code that matches a transmission control code into a code that can be transmitted as a data code, and an inverse conversion table that inversely converts the code converted by the conversion table to the code before conversion when received. A pseudo-transparent transmission method characterized by performing transparent transmission according to a control procedure.