In a cable we can have 6, 12, 24, 48, 72 or 96 fibers. Colour identification scheme also employed now worldwide to facilitate identification of cable during installation and maintenance. Aerial and underground hoisting of cables possible. In underground cabling, two types exist. They are non-duct type and duct type. In non-duct type, burial is direct and is through high density polythene pipe. Nowadays for communication, loose tube type cables and slotted core type cables are widely used. In loose tube type cable, one or more fiber is incorporated which is then stranded helically in continuous or alternate paths. Material used for protective loose tube is thermoplastic in nature. Slotted core type cable consists of a plastic rod abstracted over a strong central fiber. Here mechanical and thermal response is very much fabulous.
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