Ericsson ECN330 Manuel d'utilisateur télécharger pdf (Page 13)

Figure 1 Fiber coatings, tight buffer and loose tube. [4]

Figure 1 shows different coating methods. There are two types of secondary

protection for fibers, loose tube and tight buffer. Usually tight buffer cable is

used inside buildings and loose tube outdoors. Tight buffer is typically just

another coating on top of the primary protection. The diameter is typi-

cally900

. In Loose tube protection, a hollow tube surrounds the fiber or

fibers. The diameter is around

−

. In Figure 2, all the core structures

are presented. [2] [3]

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Ericsson ECN330 Manuel d'utilisateur Page 13