IEC 61754-7-1:2014(E) defines the standard interface dimensions for type MPO family of connectors with one row of fibres. This first edition of IEC 61754-7-1, along with the first edition of IEC 61754-7-2, cancels and replaces the third edition of IEC 61754-7, published in 2008. This first edition of IEC 61754-7-1 includes the one fibre row MPO variants, including the addition of active device receptacles and up-angled plugs. Keywords: interface dimensions for type MPO family of connectors with one row of fibres