Cable chain stitch is different from the usual chain stitch in a slight way. This stitch has each of its loops connected by a small ‘cable’ , instead of being connected directly with each other as in chain stitch.
I will be illustrating this stitch over a straight stitch line from bottom to top. You need to be aware of the chain stitch to be able to do this stitch. Do pay attention to the way the thread is wrapped around the needle during the stitch procedure.