IEC 60793-2-40:2009(E) is applicable to optical fibre categories A4a, A4b, A4c, A4d, A4e, A4f, A4g and A4h. These fibres have a plastic core and plastic cladding and may have step-index, multi-step index, or graded-index profiles. The fibres are used in information transmission equipment and optical fibre cables. This technical revision defines an enhanced A4a fibre named A4a.2 while the existing A4a fibre has been renamed A4a.1.
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