OS2 vs OM3 vs OM4 Fiber: Choosing the Right Type for Your DFW Data Center
One of the most common questions from IT managers planning a fiber upgrade in the DFW Metroplex is: which fiber type should I use? OS2, OM3, and OM4 each serve different purposes. Choosing the wrong one means either overpaying or under-specifying for your actual network requirements in Irving, TX.
The Core Difference: Single-Mode vs Multimode
OS2 is a single-mode fiber, meaning light travels in a single ray down a 9-micrometer core. OM3 and OM4 are multimode fibers with a 50-micrometer core that carries multiple light modes simultaneously. Single-mode travels farther; multimode is lower cost at shorter distances.
OS2 Single-Mode Fiber
Jacket color: Yellow | Core: 9/125um | Wavelength: 1310nm or 1550nm
OS2 fiber supports distances measured in kilometers, making it the correct choice for inter-building connections, campus backbone runs, and any span over 300 meters. In the DFW area, OS2 is widely used for connecting buildings across corporate campuses in Las Colinas and Irving.
OM3 Multimode Fiber
Jacket color: Aqua | Core: 50/125um | Wavelength: 850nm
OM3 supports 10GBASE-SR to 300m, 40GBASE-SR4 to 100m, and 100GBASE-SR4 to 100m. It is a cost-effective choice for within-datacenter runs under 100 meters. Many existing DFW data centers already have OM3 installed and extending those runs remains practical.
OM4 Multimode Fiber
Jacket color: Erika violet (magenta) | Core: 50/125um | Wavelength: 850nm
OM4 extends multimode reach significantly: 10GBASE-SR to 550m, 40GBASE-SR4 to 150m, 100GBASE-SR4 to 150m. For new data center builds in Irving and the DFW Metroplex, OM4 is the recommended specification when multimode is appropriate, as it provides headroom for future speed upgrades.
Quick Selection Guide
| Use Case | Recommended Fiber |
|---|---|
| Building-to-building or >300m runs | OS2 Single-Mode |
| Existing OM3 infrastructure, <100m | OM3 Multimode |
| New 100G builds, within-building | OM4 Multimode |
| Future 400G readiness | OS2 or OM4 (check transceiver spec) |
Need Help Choosing? Talk to EITS in Irving, TX
Excellent IT Telecom Solutions stocks MPO trunk cables and MTP trunk cables in all three fiber types. Our team serves Irving, Dallas, Fort Worth, and all of Texas. Contact us for a fiber consultation or quote.
