a channel alignment circuit which is capable of separating six frame signals of 51 . 84 mbps for six channels by expanding a control signal from a channel alignment block into three signals for a reframer of a cable television system . the circuit includes a cib detector for detecting 51 . 84 mbps of six descrambled channels and generating a 12 - bit channel number data , a control signal generator for generating a 3 - bit channel alignment control signal by using a 3 - bit data among the channel number data from the cib detector , and a channel alignment unit for separating the data inputted into six channels in accordance with a control signal from the control signal generator .