IEC 61754-31-2016 pdf download.Fibre optic interconnecting devices and passive components – Fibre optic connector interfaces – Part 31: Type N-FO connector family.
This part of IEC 61 754 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 61 754-1 , Fibre optic interconnecting devices and passive components – Fibre optic connector interfaces – Part 1: General and guidance IEC 61 755-3 (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 1 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. It has a threaded coupling mechanism, which is designed to be tightened to a torque of 1 Nm to 2 Nm.
4 Interfaces
General requirements defined in IEC 61 754-1 are valid for this standard.
This standard contains the following standard interfaces:
Interface IEC 61 754-31 -1 : two way plug connector interface
Interface IEC 61 754-31 -2: two way socket connector interface
Interface IEC 61 754-31 -3: four way plug connector interface
Interface IEC 61 754-31 -4: four way socket connector interface
The following plugs and sockets shown in Table 1 are intermateable.
5 Two way connector interface 5.1 Two way plug connector interface Figure 1 shows the plug connector. Figure 2 and Table 2 show the two way plug connector interface. The connector alignment feature is a resilient (split) alignment sleeve. The feature shall accept a pin gauge to its centre with a force of 1 ,0 N to 2,5 N under the condition that the plug ferrule is inserted into the feature from the other side until both pin gauge and plug ferrule butt against each other. The pin gauge shall be 1 ,249 0 mm nominal (see Table 8).IEC 61754-31 pdf download.