Method and apparatus for transmitting data from asynchronous network via synchronous network

A transmitting apparatus for receiving a synchronous frame from a synchronous network, decapsulating the synchronous frame to a frame of a specified format, the frame of the specified format containing reception data received from an asynchronous network and being added with an error detection code, and transmitting the reception data contained in the frame of the specified format to the asynchronous network, the transmitting apparatus comprising:

• an inverting part configured to perform bit inversion in which the reception data are converted to bit inverted reception data;
• a selecting part configured to select either the reception data or the bit inverted reception data according to the error detection code obtained from the reception data and the error detection code obtained from the bit inverted reception data;
• and
• a transmitting part configured to transmit either the reception data or the bit inverted reception data selected by the selecting part.

A transmitting method for encapsulating reception data received from an asynchronous network to a frame of a specified format, transmitting the reception data as a synchronous frame from a first transmitting apparatus to a second transmitting apparatus via a synchronous network, and then transmitting the reception data from the second transmitting apparatus to the asynchronous network, comprising the steps of:

• a) generating an error detection code for detecting an error in the reception data;
• b) adding the error detection code to the reception data;
• c) performing bit inversion on the reception data in which the reception data added with the error detection code are converted to bit inverted reception data;
• d) selecting either the reception data or the bit inverted reception data according to the number of bit patterns included in the reception data and the bit inverted reception data;
• e) mapping either the reception data added with the error detection code or the bit inverted reception data selected in step d) into the synchronous frame;
• f) transmitting the synchronous frame from the first transmitting apparatus;
• g) receiving the synchronous frame including the reception data with the second transmitting apparatus;
• h) performing bit inversion in which the reception data included in the synchronous frame are converted to a second bit inverted reception data;
• i) selecting either the reception data included in the synchronous frame or the second bit inverted reception data according to the error detection code obtained from the reception data included in the synchronous frame and the error detection code obtained from the second bit inverted reception data;
• and
• j) transmitting either the reception data included in the synchronous frame or the second bit inverted reception data selected in step i) to the asynchronous network.