With the addition of values related to the technical characteristics, the Recommendation on optical fibre cables for duct and tunnel application will be aligned to other ITU-T standardization documents and the users will have at their disposal also the values of the technical characteristics to be complied with.

References "[ITU-T G Suppl.40] ITU-T G-series Recommendations – Supplement 40 (2018), Optical fibre and cable Recommendation and standards guideline", "[ITU-T G Suppl.59] ITU-T G-series Recommendations – Supplement 59 (2018), Guidance on optical fibre and cable reliability" and "[IEC TR 62691] IEC TR 62691 (2016), Optical fibre cables – Guidelines to the installation of optical fibre cables" were moved from Clause 2 to Bibliography of the LC text.