Works with
- TP-Link managed, smart and Omada switches with gigabit SFP slots, and other SFP-MSA-compliant equipment
- LC duplex connector on 50/125 um or 62.5/125 um multi-mode fiber
In the box
TL-SM311LM module, installation guide
Is it for you?
A multi-mode 1000BASE-SX SFP fiber module with an LC duplex port, 850 nm wavelength and 1.25 Gbps data rate, for fiber runs up to 550 m in TP-Link and other SFP-MSA-compatible switches.
Choose it if these matter
- Standard SFP-MSA form factor with hot swap, so it works in most gigabit SFP slots, not just TP-Link switches
- 550 m reach over 50/125 um multi-mode fiber covers most campus and between-building runs
- DDM support lets a compatible switch report the module's diagnostics
Skip it if these rule it out
- Multi-mode only: not for long single-mode runs, where the maker's TL-SM311LS is the right module
- Gigabit SFP only, not SFP+, so it cannot do 10G links
- group.json lists no maker page for it; this record cites the maker's official product page found at tl-sm311lm
Which version should you buy?
Selected package: TL-SM311LM.
Selected package
TP-Link TL-SM311LM 1000BASE-SX Multi-Mode SFP Module
This pageModel: TL-SM311LM
Compare with similar models
| Specification |  This oneTL-SM311LM 1000BASE-SX Multi-Mode SFP Module |  Back-UPS 600VA Battery Backup UPS |  Klein Tools VDV501-851 |
|---|---|---|---|
| Works with | TP-Link managed, smart and Omada switches with gigabit SFP slots, and other SFP-MSA-compliant equipment, LC duplex connector on 50/125 um or 62.5/125 um multi-mode fiber | Routers, modems, NAS drives, computers, gaming consoles and other home electronics | Shielded or unshielded twisted-pair data cable: CAT3, CAT5E, CAT6, CAT6A, CAT7, Coaxial cable: RG59, RG6/6Q with F-connector, Voice cabling with RJ11/RJ12 terminations |
| Best for | Homelab, Budget | Backups, Home office, Homelab, Budget | Home office, Homelab, Wired backhaul, Budget |
| Open | View | View |
Full specifications (11)
- Standard
- 1000BASE-SX, IEEE 802.3z, CSMA/CD, TCP/IP
- Data rate
- 1.25 Gbps
- Wavelength
- 850 nm
- Fiber type
- 50/125 um or 62.5/125 um multi-mode fiber
- Max cable length
- 275 m (62.5/125 um) or 550 m (50/125 um)
- Port type
- LC duplex
- Hardware features
- DDM, SFP-MSA compliant, hot swappable
- Power supply
- 4 V
- Dimensions (W x D x H)
- 2.1 x 0.5 x 0.5 in (55.4 x 13.7 x 12.9 mm)
- In the box
- TL-SM311LM module, installation guide
- Certifications
- FCC, CE
Downloads & support
Setup: No drivers needed: SFP modules are recognized automatically by the switch slot.
Links go to the manufacturer’s official pages, so you always get the latest, genuine files.
Sources: TP-Link specifications · tp-link.com. Photos: TP-Link · static.tp-link.com. Specifications checked November 9, 2026. Spotted an error? Tell us.