IEC/TR 62000:2010(E) provides guidelines indicating the items that should be taken into account when planning to connect:
(1) different implementations of single-mode fibres of the same type, e.g. different implementations of type B single-mode fibres, and
(2) single-mode fibres of different types, e.g. B1.1 with B4. The major technical changes with respect to the previous edition are considerations concerning B6 fibres.