(worked over 12 sts)
Rows 1, 3, 17, 19, 21 and 23 (RS) K3, [p1, k1] twice, p1, k4.
Rows 2, 4, 16, 18, 20 and 22 P3, [k1, p1] 2 times, k1, p4.
Row 5 Sl 3 sts to cn and hold to back, p1, k1, p1; k3 from cn., Sl 3 sts to cn and hold to front, k3; k1, p1, k1 from cn.
Rows 6, 8, 10, 12 and 14 K1, p1, k1, p7, k1, p1.
Rows 7, 9, 11 and 13 P1, k1, p1, k7, p1, k1.
Row 15 3 sts to cn and hold to front, k3, p1, k1, p1 from cn., Sl 3 sts to cn and hold to back, k1, p1, k1; k3 from cn.
Row 24 Rep row 2.
Rep rows 1–24.
Note: this is a generic pattern for creating this cable. For a single cable it would be 12 stitches. In the example shown, there is one repeat of the stitch with 12 stitches are on either side, so you'd need to cast on 32 (12 + 12 + 12) stitches and knit 12 stitches before and after the pattern.
Stitch directions reproduced with permission, from Vogue Knitting Stitchionary: Volume Two, Sixth & Spring Books, 2005