Amendment 1 to Recommendation ITU-T G.657 is aimed to provide information on reliability of optical fibre with small bending radius.

Clause I.2 is inserted to describe general aspects on failure characteristics under small radius bending. The following figures and tables are also introduced in this amendment.

Figure I.1 Example of calculated relationship between failure probability and bending radius for uniformly bent one-turn fibres.

Figure I.2 Example of time to failure under ultra-small bending radius.

Table I.1 Example of failure probability for fibre stored in loose coils.

Table I.3 Example of failure probabilities with bend only and bend + tension.

Reliability of small bending radius is an ongoing topic under study in ITU-T and IEC.