Defines the requirements for type BFOC/2,5 connector sets. Type BFOC/2,5 is a sub-family of single position optical connector sets. They are characterized by a bayonet coupling mechanism and a cylindrical ferrule of 2,5 mm typical diameter. The sub-family includes plug-adapter-plug and plug-socket configurations. The contents of the corrigendum of May 1996 have been included in this copy.