|Core/Cladding (OMx refers to TIA/ISO types, G.xxx to ITU)||Attenuation @850/1300 nm, Typical (TIA*)||Bandwidth @850/1300 nm||Applications/Notes|
|50/125 microns (OM2, G.651.1)||3/1 dB/km (3.5/1.5 dB/km)||500/500 MHz-km||Laser-rated for GbE LANs|
|50/125 microns (OM3, G.651.1)||3/1 dB/km (3.5/1.5 dB/km)||2000/500 MHz-km||Optimized for 850 nm VCSELs|
|50/125 microns (OM4, G.651.1)||3/1 dB/km (3.5/1.5 dB/km)||3600/500 MHz-km||Optimized for 850 nm VCSELs, higher speed for 10 GB/s and above|
|50/125 microns (OM5, G.651.1)||3/1 dB/km (3.5/1.5 dB/km)||3500/500 MHz-km|| Optimized
for WDM with VCSELs, in wavelength range 850-950nm
|62.5/125 microns (OM1)||3/1 dB/km (3.5/1.5 dB/km)||200/500 MHz-km||LAN fiber pre-GB/s networks|
|62.5/125 microns (FDDI grade)||3/1 dB/km||160/500 MHz-km||LAN fiber from FDDI network specification|
|100/140 microns||3/1 dB/km||150/300 MHz-km||Obsolete|
|85/125 microns||3/1 dB/km||200/400 MHz-km||Rare, obsolete|
|Core/Cladding||Attenuation @850 nm||Bandwidth @850 nm||Applications/Notes|
|200/240 microns, usually PCS (plastic-clad silica) or HCS (hard-clad silica) types||4-6 dB/km||50 MHz-km||Slow LANs & links|
|Size||Attenuation @ 650 nm||Bandwidth @ 650 nm||Applications/Notes|
|1 mm (many other sizes available)||~ 1 dB/m||~5 MHz-km||Short Links & Vehicles|
Since the introduction of Gigabit Ethernet, we've seen premises cabling, designed to carry gigabit and 10 gigabit (and faster) traffic using 850 nm VCSEL (laser) transmitters, moving toward standardization on 50/125 laser-optimized fiber (now often called OM3/OM4 fiber for it's international standards designation) often with LC connectors to match the manufacturers' standard for VCSEL transceivers. OM3 cabling even has it's own color, aqua, specified in TIA-598 color codes.If you are planning, designing, installing or using high speed premises fiber optic networks, you should probably be recommending and using OM3 or OM4 fiber and LC connectors. Within the industry, this is becoming a "de facto" standard. One big advantage of using a full OM3/OM4 cabling standard is that the cabling is easily identifiable by the aqua color and when LC connectors are used instead of ST or SC connectors, it cannot be interconnected with legacy cabling, especially 62.5/125 fiber which causes large mismatched fiber losses. OM5 fiber is a special version of OM4 specified for use in the full range of 850-950nm to allow wavelength division multiplexing with VCSELs.
|Cabling System Name||Fiber Type||Connector Type||Cable Type (Premises, + fiber count)|
|OM5||OM5 - 50/125 laser optimized||OM5 -
OM5/ST - ST connector
OM5/SC - SC connector
|OM4||OM4 - 50/125 laser optimized||OM4 -
OM4/ST - ST connector
OM4/SC - SC connector
|OM2||OM2 - 50/125||OM2/ST
- ST connector
OM2/SC - SC connector
OM2/LC - LC connector
|OM1||OM1 - 62.5/125||OM1/ST
- ST connector
OM1/SC - SC connector
Fiber types are
identified by color codes for cable jackets and/or connectors.
More information on fiber optic color codes.
More Information on Singlemode and Multimode fiber.
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