1.1Product definitionThis European Standard specifies the dimensional, optical, mechanical and environmental performance requirements of a Terminal Equipment Boxes for the FTTX networks. The Terminal Equipment Box will house the ONT/CPE (electronics) and it protects the optical fibres, splices and connectors from direct contact with the user. Optionally it can contain the network test interface, the power supply and the batteries.The performance of the electronics, power supply or batteries are not part of this document. These are covered by another EN document, EN 50700.This specification contains the initial, start of life optical, mechanical and environmental performance requirements of the optical fibre termination in a Terminal Equipment Box, in order for it to be categorized as an EN standard product.1.2Operating environmentThe tests selected combined with the severity and duration is representative of indoor and outside plant for above ground environments defined by:EN 61753-1Category C Controlled environment1.3ReliabilityWhilst the anticipated service life expectancy of the product in this environment is 20 years, compliance with this specification does not guarantee the reliability of the product. This should be predicted using a recognised reliability assessment programme.1.4Quality assuranceCompliance with this specification does not guarantee the manufacturing consistency of the product. This should be maintained using a recognised quality assurance programme.1.5Allowed fibre and cable typesAll EN 60793-2-50 fibres can be stored in the Terminal Equipment Box with a minimum storage radius of 20 mm (up to a length of maximum 2 m).Smaller storage radii down to 15 mm are possible with the EN 60793-2-50 B6A fibre types, but in this case the reduction in mechanical reliability should be taken into account (see Annex A).