Breakout cables normally contain a ripcord, two non-conductive dielectric strengthening members (normally a glass rod epoxy), an aramid yarn, and 3 mm buffer tubing with an additional layer of Kevlar surrounding each fiber. Tight buffer cables are offered for a variety of applications, but the two most common are " Breakout" and " Distribution". Instead of a loose tube, the fiber may be embedded in a heavy polymer jacket, commonly called "tight buffer" construction. Dry block offers less protection to the fibers than gel-filled, but costs considerably less. Loose-tube fiber may be "dry block" or gel-filled.
This protects the fiber from tension during laying and due to temperature changes. In loose-tube construction the fiber is laid helically into semi-rigid tubes, allowing the cable to stretch without stretching the fiber itself. 'Ribbon' type fiber optic cables can house many more fibers than 'loose tube' types.įor use in more strenuous environments, a much more robust cable construction is required.
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