Supplement 47 to ITU-T G-series Recommendations provides information on the general transmission characteristics of single-mode optical fibres and cables specified in the ITU‑T G.65x‑series Recommendations related to the practical use condition. It covers the environmental and length related characteristic of ITU-T G.65x-series optical fibre and cable. The fibre material related characteristics are also described in Appendix I.
Version 2 of this supplement introduces general aspect of multi-path interference (MPI) in an optical fibre in order to support newly established test method for coherent MPI which can be found in Appendix IV of Recommendation ITU-T G.650.1.