This Recommendation deals mainly with important considerations concerning optical singlemode fibre access network architectures and the ability to upgrade or new deployment of the optical networks@ which are the most important items at each stage in terms of designing@ constructing@ operating and maintaining optical access networks quickly@ effectively and economically for broadband services. Moreover@ this Recommendation describes the optical transmission performance@ the maintenance system and power supply required for the design and construction of an optical access network for broadband services. Furthermore this recommendation covers: ?C physical network architectures that have been used to meet different system objectives ?C environmental conditions in customer serving areas ?C passive optical components used for construction of the network ?C installation and maintenance issues ?C safety requirements ?C use of standardised material