ITU-T Recommendations

Supplement 40 to the ITU-T G-series Recommendations provides information on the background and specifications used in the development of optical fibre and cable ITU-T Recommendations such as Recommendations ITU-T G.651.1, ITU‑T G.652, ITU-T G.653, ITU-T G.654, ITU-T G.655, ITU‑T G.656, ITU-T G.657 and L series Recommendations. It also contains information used in the development of test method Recommendations such as Recommendations ITU-T G.650.1, ITU‑T G.650.2 and ITU-T G.650.3. Moreover, this Supplement maps ITU‑T documents to optical fibre and cable standards developed under IEC.