As pictured, works on multiples of 8 stitches.
Row 1: *Knit 3, purl 2, knit 3. Repeat from * across.
Row 2: *Purl 3, knit 2, purl 3. Repeat from * across.
Row 3: Repeat row 1.
Row 4: *Purl 3, (Knit two together, leaving the stitches on the left-hand needle. Knit into the first stitch again and slide both off the needle.), purl 3. Repeat from * across.
Repeat these four rows for pattern. This pattern can be altered easily to make the space between the cables bigger or smaller. For instance, you could have just three stitches on either side of each cable instead of six, or go up to five, or whatever you like.