Multimode fiber is a staple of fiber-optic cable infrastructure in data centers and campus networks. The ISO/IEC 11801 standard defines five classes of multimode fiber: OM1, OM2, OM3, OM4 and OM5. In this white paper, we will review the basics of multimode fiber and the evolution of the different fiber standards. We’ll discuss the differences between OM4 and OM5 and clear up the misconceptions, discussing when OM5 is an appropriate choice and when OM4 will work just fine.

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