This technical report provides guidelines concerning single-mode fibre compatibility. A given type of single-mode fibre@ for example B4@ may have different implementations by suitably optimising several of the following parameters: mode field diameter (hence effective area)@ chromatic dispersion coefficient@ slope of the chromatic dispersion curve@ cable cut-off wavelength. This guideline indicates 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. See IEC 60793-2-50 for the attributes and definitions of single-mode fibre. This guide does not consider the connection of fibres with the same implementation from different manufacturers@ which is already considered by the standardisation procedure.