In my sample, I added 2 extra stitches, worked in garter stitch, to separate my mock cable panels. You do not have to do this - you can just repeat the mock cable pattern as many times as you like without something separating the panels.
Play around with the spacing, making them closer or further apart. If you want a different stitch separating your panels, and don't like garter stitch, try a true cable or simple mesh stitch.
Cast on 7 stitches (per panel)
Rows 1 and 3: (WS) k2, p3, k2
Row 2: p2, k3, p2
Row 4: p2, knit into 3rd stitch on left needle, then knit into the second stitch, and finally knit into the first stitch, dropping all three from left needle, p2
Sample knit with DK weight yarn on US Size 7 needles
Multiple of 2
Row 1 (ws): purl
Row 2: k1 *p2, wyif slip the two sts back to left needle, then take the yarn across the front of the two sts to back of work and slip sts back to right needle; rep from * to last stitch, k1