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All fibres are fitted with secondary protection before beeing laid in the cable tube. There are different fibre opric cable tubes:
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| Tight Buffering | |||
| The fibre is tightly jacketed with a thermoplastic oversheath |  |
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| Semi Loose Buffer Type | |||
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The fibre is semi-loosely jacketed in a tube made of a polymer material.
The interstices between the fibre and the loose buffer tube allow a play
of only a few hundredths of a millimeter. The outside diameter of the semi-loose buffer tube is identical to the tight buffered tube. The advantages of the semi-loose buffering compared with tight buffering are:
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| Loose Buffer Type | |||
| An optical fibre is loosely jacketed in a tube made of a polymer material. The tube can comprise one or several layers of the same or different plastics. The interstice inside the loose tube is just a few tenths of a millimetre and is filled with a gel. |  |
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| Multi Fibre Loose Buffer Type | |||
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Two to 12 optical fibres are loosely encapsulated together with polymer
material. The tube can comprise one or several layers of the same or different materials. The cavity inside the tube is filled with gel. |
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