OM2 Fiber: Better Than OM1, Still Not Modern
Quick answer / TL;DR: Short answer: OM2 carries 1G to about 600 m and 10G to about 82 m. For new work use OM4, which reaches 400 m at 10G on the same 50 micron core. Keep OM2 where it already exists, and plan replacement before any 10G rollout beyond 80 m.
Fiber cords: two connector families, two fiber types, three polish options.OM2 is 50 micron multimode fibre rated at 500 MHz-km. It roughly doubles OM1's reach at 1G and more than doubles it at 10G.
It is still not a sensible choice for new installations.
Reach Comparison
| Speed | OM2 | OM3 |
|---|
| 1G | 600 m | 550 m |
| 10G | 82 m | 300 m |
| 40G | Not supported | 100 m |
The 40G row is the cut-off: OM2 has no parallel-optics support, so any future 40G or 100G plan requires new fibre.
Migration Practice
- Match the existing grade for repairs
- Label grade at both ends
- Plan replacement before 10G rollout
- Do not mix grades within one channel
- Keep OM2 patch cords separate from OM4
Separating patch cords is a practical control: they look identical and the link silently runs at the lower grade.
Real-World Applications
A school with OM2 between buildings at 1G is fine for now. The same campus planning 10G to classrooms must replace the fibre, because 82 m will not reach across a building.
Standards and Verification
| Reference | Relevance |
|---|
| ISO/IEC 11801 | OM2 category |
| IEC 60793-2-10 | Multimode fibre |
| IEEE 802.3 | Reach by PHY |
Installed link performance is not provided in the knowledge base. Test before upgrading optics.
References
- ISO/IEC 11801-1, Generic cabling
- IEC 60793-2-10, Multimode optical fibres
- IEEE 802.3, Ethernet
Practical Notes
Photograph the jacket print at installation. It is the only durable record of the grade.
Related reading: multimode fiber cable — blogs/news/multimode-fiber-cable
Related reading: om1 fiber cable — blogs/news/om1-fiber-cable
Frequently Asked Questions
How far does OM2 do 10G?
About 82 m.
Can OM2 do 40G?
No.
What replaces OM2?
OM4, on the same 50 micron core.
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