OM1 (Optical Multimode 1) is a type of multimode optical fiber commonly used for short-distance communications within buildings or campuses. OM1 fiber is characterized by a 62.5-micron core diameter and is typically used with LED light sources. The effective distance that OM1 fiber can support for 1 Gigabit Ethernet (1GbE) depends on factors such as the networking equipment, light source, and the type of transceivers used.

In general, the specified maximum reach for 1GbE over OM1 fiber is approximately:

• 550 meters: This distance is commonly used as the standard for 1GbE over OM1 fiber.

It's important to note that the reach of OM1 fiber decreases as the data rate increases. For higher data rates like 10 Gigabit Ethernet (10GbE) or beyond, OM1 fiber is not suitable due to its limited bandwidth and higher attenuation.

If longer distances are required or if you are considering higher data rates, you may need to upgrade to a fiber optic cable with a higher bandwidth, such as OM3 or OM4, or consider using single-mode fiber (OS1 or OS2) for longer-distance applications. OM1 fiber is primarily suitable for short-reach applications within buildings where the limited bandwidth and distance capabilities are sufficient.