Filled foam skin cable. Solid, annealed copper; sizes 19, 22 and 24 AWG. Dual insulation consisting of an inner layer of foamed polyolefin surrounded by a solid polyolefin skin, color-coded in accordance with telephone industry standards. Insulated conductors are twisted into pairs with varying lay lengths to minimize crosstalk. 25 pairs and less: pairs are assembled together in a single group. More than 25 pairs: pairs are arranged in groups, each group having a colorcoded unit binder. The entire core assembly is completely filled with ETPR compound, filling the interstices between the pairs and under the core tape. Non-hygroscopic dielectric tape applied longitudinally with an overlap.
