What is the difference between OS1 and OS2 fibre?

Fibre optic Cable

We are often asked for OS2 fibre in the belief that's it's superior to OS1 (as OM4 is to OM3).  But is this true and are manufacturers claims of their cable conformance correct?  In many cases, it seems, the answer is no.

Below are two useful links to explanations, the first one in from Belden, the second is a more detailed version from the FIA.

Belden

FIA

The easiest points to remember are OS1 is for Indoor / Tight Buffered cable; OS2 is for Outdoor / Loose Tube cable.  I believe the confusion has arisen as OS2 grade fibre (as in 250um) has been used in the former, but once the 900um tight buffer is applied and it's manufactured into a cable and stresses have been applied, it no longer meets the OS2 classification.  

 
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