In this paper

a new coding scheme of 5B6B Iine code by using the redundancy to transmit ancillary signals is proposed. It allows the insertion of an ancillary channel with a capacity of about 0.6% that of the primary channel. Two new coding schemes of 5B6B code are shown and the comparison is made on the hardware.The power spectral densities of them are analysed and calculated.The result shows that the power spectral density of the new 5B6B code is well-performed as the primary one.