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ITU-T G.657

Characteristics of a bending-loss insensitive single-mode optical fibre and cable for the access network Amendment 1: Revised Appendix I – Lifetime expectation in case of small radius bending of single-mode fibre

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Organization: ITU-T
Publication Date: 1 June 2010
Status: inactive
Page Count: 14
scope:

This Recommendation describes two categories of single-mode optical fibre cable which are suitable for use in the access networks, including inside buildings at the end of these networks. Both categories A and B contain two sub-categories which differ in macrobending loss.

Category A fibres are suitable to be used in the O, E, S, C and L-band (i.e., throughout the 1260 to 1625 nm range). Fibres and requirements in this category are a subset of ITU-T G.652.D fibres and have the same transmission and interconnection properties. The main modifications are improved bending loss and tighter dimensional specifications, both for improved connectivity. Sub-category ITU-T G.657.A1 fibres are appropriate for a minimum design radius of 10 mm. This sub-category encompasses fully the former ITU-T G.657(12/2006).A category.

Sub-category ITU-T G.657.A2 fibres are appropriate for a minimum design radius of 7.5 mm.

Category B fibres are suitable for transmission at 1310, 1550 and 1625 nm for restricted distances. These fibres may have different splicing and connection properties than ITU-T G.652 fibres, but are capable at very low values of bend radius.

Sub-category ITU-T G.657.B2 fibres are appropriate for a minimum design radius of 7.5 mm. This sub-category encompasses fully the former ITU-T G.657(12/2006).B category.

Sub-category ITU-T G.657.B3 fibres are appropriate for a minimum design radius of 5 mm.

The meaning of the terms used in this Recommendation and the guidelines to be followed in the measurement to verify the various characteristics are given in [ITU-T G.650.1] and [ITU-T G.650.2]. The characteristics of these fibre categories, including the definitions of the relevant parameters, their test methods and relevant values, will be refined as studies and experience progress.

Document History

November 1, 2016
Characteristics of a bending-loss insensitive single-mode optical fibre and cable for the access network
This Recommendation describes two categories of single-mode optical fibre cable with improved bending loss performance compared with that of ITU-T G.652 fibres. ITU-T G.657 fibre was originally...
October 1, 2012
Characteristics of a bending-loss insensitive single-mode optical fibre and cable for the access network
This Recommendation describes two categories of single-mode optical fibre cable which are suitable for use in access networks, including inside buildings at the end of these networks. Both categories...
ITU-T G.657
June 1, 2010
Characteristics of a bending-loss insensitive single-mode optical fibre and cable for the access network Amendment 1: Revised Appendix I – Lifetime expectation in case of small radius bending of single-mode fibre
This Recommendation describes two categories of single-mode optical fibre cable which are suitable for use in the access networks, including inside buildings at the end of these networks. Both...
November 1, 2009
Characteristics of a bending-loss insensitive single-mode optical fibre and cable for the access network
This Recommendation describes two categories of single-mode optical fibre cable which are suitable for use in the access networks, including inside buildings at the end of these networks. Both...
December 1, 2006
Characteristics of a bending loss insensitive single mode optical fibre and cable for the access network
A description is not available for this item.

References

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