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<br />City of Sunny Isles Beach |Request for Proposal No. 22-04-01 31 <br /> <br />3.13 Central Member <br />The central member, which functions as an anti-buckling element, shall be a glass reinforced plastic rod <br />with similar expansion and contraction characteristics as the optical fibers and buffer tubes. To provide <br />the proper spacing between buffer tubes during stranding, a symmetrical, linear, overcoat of polyethylene <br />may be applied to the central member to achieve the optimum diameter. <br />3.14 Filler rods <br />Fillers may be included in the cable cross-section. Filler rods shall be solid medium or high-density <br />polyethylene. The diameter of filler rods shall be the same as the outer diameter of the buffer tubes. <br />3.15 Stranding <br />The buffer tubes shall be helically wrapped using the reverse lay stranding process around the central <br />member in order to decouple the buffer tubes and optical fibers from the mechanical forces experienced <br />during installation. <br />Completed buffer tubes shall be stranded around the central member using stranding methods, lay <br />lengths, and positioning such that the cable shall meet mechanical, environmental, and performance <br />specifications. A polyester binding shall be applied over the stranded buffer tubes to hold them in place. <br />Binders shall be applied with sufficient tension to secure the buffer tubes to the central member without <br />crushing the buffer tubes. The binders shall be non-hygroscopic, non-wicking, and dielectric with low <br />shrinkage. <br />3.16 Core and Cable Water-Block Material <br />The cable core shall use a dry, water-blocking material to block the ingress and migration of water. The <br />water-blocking performance shall be equivalent to flooded optical cables when tested in accordance with <br />industry standards (ICEA, RUS). Dry, water-blocking material is used in optical cables to enhance the ease <br />of handleability while maintaining reliable water-blocking performance. <br />3.17 Tensile Strength Member <br />Tensile strength shall be provided by high tensile strength Aramid yarns and/or fiberglass which shall be <br />helically stranded evenly around the cable core and shall not adhere to other cable components. <br />3.18 Ripcord <br />The cable shall contain at least one ripcord under the jacket for easy sheath removal.