They combine internal and external cables features: they can be used both inside and outside buildings or structures. The type of fibre used depends on the network parameters, mainly distances of transmitted signal. The structure is based on the central strength element, in addition, reinforcement with aramid fibres is used to improve mechanical parameters. Sealing with swelling tape (so-called dry sealing) prevents from longitudinal water penetration. The use of a non-flammable, halogen-free external cover provides resistance to flame spreading, and an optional double-layer cover of LSOH/PA is used as a barrier against rodents.
Product examples:
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