What is an SFP Module?
Small Form-factor Pluggable (SFP) modules are compact, hot-swappable transceivers used in networking equipment like switches, routers, and media converters. They convert electrical signals to optical signals (and vice versa), enabling fiber optic connectivity.
Types of SFP Modules
1G SFP (1000BASE)
- SX (850nm): Short-range, multimode fiber, up to 550m — ideal for data center inter-rack connections
- LX (1310nm): Long-range, single-mode fiber, up to 10km — perfect for campus networks
- ZX (1550nm): Extended range, up to 80km — for metro and WAN links
- BiDi: Single-fiber operation using wavelength division — reduces fiber costs by 50%
- Copper (RJ45): 10/100/1000Mbps over Cat5e/Cat6 cable — for short copper runs
10G SFP+
- SR (850nm): Up to 300m over multimode fiber — data center standard
- LR (1310nm): Up to 10km over single-mode — enterprise backbone
- ER/ZR (1550nm): 40km/80km for long-haul connections
- BiDi: Single-fiber 10G for cost-sensitive deployments
- CWDM/DWDM: Wavelength multiplexing for maximizing fiber capacity
25G SFP28
- SR/LR: Next-gen data center interconnects
- Backward compatible with SFP+ ports at 10G
40G QSFP+ & 100G QSFP28
- SR4/SR10: Parallel multimode for high-density data centers
- LR4/ER4: Single-mode for long-distance
- Breakout cables for connecting to multiple 10G/25G ports
How to Choose the Right SFP
- Check switch compatibility — MSA compliance ensures broad compatibility
- Match fiber type — SM or MM determines wavelength and distance
- Verify distance requirements — SX for short, LX for medium, ZX for long
- Consider BiDi for single-fiber — saves 50% on fiber infrastructure
- Buy from trusted vendors — BHL Networks offers MSA-compliant, tested modules
Common Mistakes to Avoid
- Mixing TX/RX wavelengths on BiDi pairs (always use complementary pairs)
- Using MM SFPs on SM fiber (or vice versa)
- Exceeding maximum distance budgets
- Forgetting to clean fiber connectors before insertion
BHL Networks SFP Range
We stock 1G, 10G, 25G, 40G, and 100G SFP modules with LC and SC connectors, dual-fiber and BiDi options, and industrial temperature ratings. All modules are tested for compatibility with Cisco, Aruba, TP-Link, Ubiquiti, and other major brands.