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.
|OM1||275 m||33 m||Not specified||Not specified|
|OM2||550 m||82 m||Not specified||Not specified|
|OM3||Not specified||300 m||100 m||100 m|
|OM4||Not specified||500 m*||150 m||150 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."