Here is the reference table for SFP transceivers and their variants (SFP+, SFP28, QSFP+, QSFP28): speeds, module types, and ranges over fiber and copper. Keep it handy to equip a switch or router.
Transceiver formats and their speeds
| Format | Speed | Details |
|---|---|---|
| SFP | 1 Gbps | 1000BASE (Gigabit) |
| SFP+ | 10 Gbps | 10G |
| SFP28 | 25 Gbps | 25G |
| QSFP+ | 40 Gbps | 4 × 10G |
| QSFP28 | 100 Gbps | 4 × 25G |
Module types and ranges
| Type | Medium | Approximate range |
|---|---|---|
| SX / SR (multimode) | Multimode fiber | ~300 to 550 m |
| LX / LR (singlemode) | Singlemode fiber | ~10 km |
| ER | Singlemode fiber | ~40 km |
| ZR | Singlemode fiber | ~80 km |
| DAC (direct attach cable) | Copper | 1 to 7 m |
| BASE-T (RJ45) | Copper | 30 to 100 m |
Compatibility: the key point to check
Many manufacturers (Cisco, HPE, Juniper…) encode their modules: a switch may reject an unrecognized module. Always verify module compatibility with the switch’s brand and model. The fiber type (multimode OM3/OM4 or singlemode OS2) must also match on both ends of the link.
FAQ: SFP modules
What is the difference between SFP and SFP+?
The format is the same, but SFP tops out at 1 Gbps while SFP+ goes up to 10 Gbps. An SFP+ port generally accepts an SFP module, but the reverse is not guaranteed.
What is a DAC module?
A direct attach cable: a copper cable with an integrated SFP+/QSFP connector at each end, cost-effective for short links (rack, top-of-rack).
Is a module interchangeable between brands?
Physically yes, but manufacturer encoding may block it. Prefer a module compatible with your equipment.
Find our SFP / SFP+ / QSFP modules and our tested used network switches. To choose well, read our guide SFP, SFP+ and QSFP and our comparison fiber or copper.