OM1, OM2, OM3 and OM4 Fiber

In ANSI/TIA-568-C.3, the TIA adopted the nomenclature for fiber found in the international standard ISO/IEC 11801. The multimode fiber is prefixed with “OM.”

The new designation in ANSI/TIA-568-C should alleviate some of the confusion associated with application support distance issues. Each “OM” has a minimum Modal Bandwidth (MBW) requirement.

 1000BASE-SX10GBASE-S40GBASE-SR4100GBASE-SR 10
OM1275 m33 mNot specifiedNot specified
OM2550 m82 mNot specifiedNot specified
OM3Not specified300 m100 m100 m
OM4Not specified500 m*150 m150 m

*The IEEE has yet to officially give a distance for 10GBASE-S on OM4 fiber. The distances are decided by the IEEE in 802.3, not The TIA or ISO/IEC cabling standards. Some glass vendors say 500 m, but most are now quoting “up to 550m.”

 

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