News Center
2026年2月21日
Do you know what MMF and SMF mean in SFPs? 🤔
MMF or SMF?
Choosing the wrong one can cost you time, money, and network performance.
Let’s break it down in the simplest way 👇
🔹 MMF (Multimode Fiber) SFP
Best for short distances
Key features:
- Uses 850nm wavelength
- Works with OM1 / OM2 / OM3 / OM4 fiber
- Typical distance: 100m – 550m
- Common SFPs: 1G SX, 10G SR, 25G SR
When to choose MMF:
✅ Inside data centers
✅ Server-to-switch connections
✅ Short-distance, high-density cabling
✅ Lower transceiver cost
👉 Example:
10G SFP+ SR + OM3 fiber = up to 300m
🔹 SMF (Single Mode Fiber) SFP
Best for long distances
Key features:
- Uses 1310nm / 1550nm wavelength
- Works with OS2 fiber
- Typical distance: 10km / 20km / 40km / 80km
- Common SFPs: 1G LX, 10G LR, ER, ZR
When to choose SMF:
✅ Building-to-building links
✅ ISP & metro networks
✅ Long-distance transmission
✅ Future network expansion
👉 Example:
10G SFP+ LR + OS2 fiber = up to 10km
⚠️ Quick Rule to Avoid Mistakes
- Short distance (<500m)? → MMF
- Long distance (>2km)? → SMF
- Different fiber types CANNOT be mixed
💡 Pro Tip from the Field
Many network issues are not caused by the switch or SFP —
they’re caused by MMF & SMF mismatch.
If you’re unsure, always confirm:
👉 Speed + Distance + Fiber type
If you’re planning a network upgrade or checking SFP compatibility, feel free to connect or comment below 👇
Happy to help 💬
#SFP #MMF #SMF #OpticalTransceiver #FiberOptic #DataCenter #Networking #Ethernet #10G #100G #NetworkUpgrade