The 256FO Duct Loose Tube Fiber Optic Cable SM G.657.A1 (Part number: ) from Draka with 256FO. Conduit cables are underground cables, that may be conducted by duct or buried directly into the ground. There are several types of protections for this cable such as anti-rodent or double protection. Conduit cables are built to withstand harsh environments and are typically routed by pull or blow.
Central Strength Member (CSM): glass fibre reinforced plastic rod (FRP), with plastic oversheathing when needed.
Loose Tube: thermoplastic material, containing fibres and filled with a suitable water tightness compound.
Filler Elements: thermoplastic rods, where needed.
Stranding: loose tubes (and fillers), SZ stranded around the CSM.
Longitudinal Water Tightness: dry core with water swellable elements.
Inner Sheath: HFFR, 2 ripcords beneath.
Peripheral Strength Elements: aramid yarns.
Outer Sheath: HFFR, 2 ripcords beneath.