IEC 61754-31:2016,Fibre optic interconnecting devices and passive components – Fibre optic connector interfaces – Part 31: Type N-FO connector family.
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IEC 61754-31.
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This part of IEC 61754 defines the standard connector interface dimensions for the two way and four way type N-FO family of connectors.
2 Normative references
The following documents, In whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 61754-1, Fibre optic interconnecting devices and passive components — Fibre optic connector interfaces — Part 1: General and guidance
IEC 61755-3 (all parts), Fibre optic interconnecting devices and passive components Connector optical interfaces — Connector parameters of non-dispersion shifted single mode physically contacting fibres.
3 Description
3.1 General
The N-FO connector family comprises a two way and four way circular plug connector and socket set. The plug connector in each case includes a spring loaded threaded coupling nut and the plug shell features a single keyway which is used to orient it with a key in the socket with which it is being mated. The 1,25 mm non-angle polished ferrules used within the connectors are aligned using resilient sleeves housed within the plug.
3.2 Two way system
This system consists of two spring loaded ferrules within each connector body. The pitch between the two fibre centres is nominally 3,0 mm.
It has a threaded coupling mechanism, which is designed to be tightened to a torque of I Nm to 2 Nm.
3.3 Four way system
This system consists of four spring loaded ferrules in a row within each connector body. The pitch between any two adjacent fibre centres is nominally 2,50 mm.IEC 61754-31:2016 pdf download.