Lay length or pitch refers to the rise height during the stranding of symmetrical cable pairs. For example, a lay length of 70 means that after 70 mm the wires have made a helical stranding of 360 degrees around the stranding axis.
There are data cables with different lay lengths. This is a design measure to improve the near-end cross-talk attenuation( NEXT). For this purpose, the different lay lengths are implemented in prime factors (71, 73, 79, 81, 83, 89, 97).