II: SPECIFICATIONS FOR FIBER OPTIC NETWORK AND CABLES Article II.1: Fiber Optic specifications The following features should be taken into consideration while choosing fibre optic and cable :  All fibre optics must meet the requirements of ITU-T Recommendations;  Each cable must have traceability of the fibre optic back to the original fibre ID number and test parameters as provided by the fibre manufacturer ;  Each fibre must be distinguishable from other fibres in the same duct by means of colour coding ink visible throughout the design life of the cable (as Defined by TIA5987C);  Fibre optics shall have a high level of splice compatibility with fibre optics from other manufacturers; Performance specifications for standard single mode Fibre optic (ITU-T G.652) and recommended multimode Fibre optics (ITU-T G.651) are detailed in Appendix3 and 4. II.2 : Cable Specifications The cables must be circular in cross section and free from pinholes, joints, repairs and other defects. Materials used in the construction of the cable shall not affect the physical or optical properties of the fibres and shall be compatible with each other. The above mentioned provisions (section 2.1 and 2.2) comprise requirements for the mostly used materials for FOC network and its specifications. However, it remains the network provider responsibility to identify and procure all the required materials for the complete FOC installation work 3