Multi-mode fibres are used the most often (though there is nothing to prevent from the use of SM fibres). Outer shell is made of flame retardant material, low emission of smoke and halogen-free (LSOH) so that they can be used in enclosed spaces, railway tunnels, road, etc. They are fully dialectic, and resistant to electromagnetic interference; flexible and easy to install; can be placed near electrical installations.
I-V(ZN)H 2 (DUPLEX)
I-V(ZN)H 2-24 (multi-fibre)