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In communications cables--including fiber-optic cables--having the transmission media wrapped helically around a central member, the longitudinal distance along the cable required for one complete helical wrap; i.e. , the total cable length divided by the total number of wraps. Note 1: In many fiber-optic cable designs, the lay length is shorter than in metallic cables of similar diameter, to avoid overstressing the fibers during the pulling associated with the installation operation. Note 2: The wraps, i.e. , turns, that are referred to should not be confused with the twists given twisted metallic pairs, i.e. , wires, to reduce electromagnetic coupling. Pairs of optical fibers are not given such twists. [After FAA] Synonym pitch.