Multimode fiber is available in different grades, ranging from OM1 to OM5. The main differences are the core size, in microns or µ, and modal bandwidth. In general, the larger the core size the farther the signal needs to travel within the core due to the size of the waves. Larger cores limit the maximum length of the cable Modal bandwidth refers to the maximum signaling rate, or maximum distance. for a given signaling rate. The greater the bandwidth, the greater capacity of a fiber to transmit information. This determines the distance each Ethernet variant can reach over that type of fiber.

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