还有许多公司在主干网中结合安装单模和多模光纤。
Many companies also are installing a combination of singlemode and multimode fiber in backbones.
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.
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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