Database, how to build a database, a communication device and an electronic component mounting apparatus

A database for converting data to be transmitted in a communication system, providing a database that can achieve both securing improvement and DC balance of the transmission efficiency of data. First and second tables TB1, TB2 includes a transmission data D1, the 8-bit pre-conversion D2 (first data unit), input data ED1 of 16 bits after conversion, ED2 (second data portion) and the corresponding It is attached. Conversion data ED1, ED2 is transmitted 8B / 10B conversion on data D1, D2, are set data 0.00 encoding process (5 bits) and 1 the added DC balance adjustment bit bit forward error correction there.