This part of IEC 61753 defines B/2 performance levels which a singlemode connector/cable assembly must satisfy in order to be categorised as meeting the IEC standard, Category O – Uncontrolled environment, as defined in Table A.4b of IEC 61753-1.
IEC 61753-021-6 Ed. 1.0 b:2007
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Fibre optic interconnecting devices and passive componentsperformance standard – Part 021-6: Grade B/2 single-mode fibre optic connectors for category O – Uncontrolled environment