光学纤维。第2 - 20部分：产品规范。A 2类多模光纤分规范。

Optical fibres - Part 2-20: product specifications - Sectional specification for category A2 multimode fibres.

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光学纤维。第2-30部分：产品规范.A3 类多模光纤分规范。

Optical fibres - Part 2-30 : product specifications - Sectional specification for category A3 multimode fibres.

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玻璃纤维芯有两种基本的类型：多模光纤，用于10 km以下的距离；单模光纤，用于更长的距离。

The glass fiber core comes in one of two basic types: multimode fiber for distances up to 10km and single-mode fiber for longer distances.

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