This part of IEC 60794 is a family specification covering features of optical fibre cables applicable to outdoor as well as indoor environments: so called Universal Indoor-Outdoor cables . These cables generally possess the characteristics associated with outdoor cable designs (according to IEC 60794-3 however typically less stringent, typically non armoured ) having the thermal and mechanical robustness that makes them suitable for use in the outside plant, while simultaneously being flexible enough, compact and lightweight and exhibiting the fire performance required in indoor premises. A typical application is e.g. the centralized cabling in central office, the Premises or Local Area Network where the same cable design is used for the entire length of the cabling link including both the indoor as well as the outdoor portions.