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The cable type is longitudinally water-blocked and intended for outdoor use (in ducts). The design can incorporate up to 640 fibres. The fibres are grouped into ribbons consisting each of four fibres (maximum 96 fibres) or 8 fibres (maximum 480 fibres). The 4- or 8-fibre ribbons are stacked in a slotted core profile of polyethylene, which is extruded onto a dielectric fibre reinforced strength member (FRP). The cable type is longitudinal water-blocked through use of polymeric filling compound. GASLDV is sheathed with halogen-free black LLDPE.