1.1 Product definition This European Standard contains the initial, start of life dimensional, optical, mechanical and environmental performance requirements (excluding electrical requirements) for a 12 fibre multimode PPS MPO plug terminated on EN 60793-2-10 category A1a.3a or A1a.3b fibre and a 4+4x10,3125 Gb/s MPO (QFSP) transceiver to meet in order to be categorized as an EN standard product. Since different variants are permitted, product marking details are given in 4.6. 1.2 Intermateability All products conforming to the requirements of this standard are meant to be intermate and give the specified level of random coupled and received power performance. The intention is that this will be true irrespective of the manufacturing source(s) of the product. 1.3 Operating environment The tests selected combined with the severity and duration are representative of a backplane/back panel indoor application derived from customer premises protected environment as defined in EN 50173 series and ISO/IEC 11801 and as specified in category C per EN 61753-1 typically described as a data centre environment. 1.4 Reliability Whilst the anticipated service life expectancy of the product in this environment is 10 years, compliance with this standard does not guarantee the reliability of the product. This should be predicted using a recognized reliability assessment programme. 1.5 Quality assurance Compliance with this standard does not guarantee the manufacturing consistency of the product. This should be maintained using a recognized quality assurance programme.