Works with
- Any SFP slot following the SFP Multi-Source Agreement, including TP-Link managed and smart switches
- LC duplex connectors on 9/125 um single-mode fiber
Is it for you?
An Omada 1000Base-LX single-mode fiber mini GBIC (SFP) module from TP-Link that carries a Gigabit link up to 20 km over 9/125 μm single-mode fiber, with LC duplex connectors, 1310 nm wavelength and Digital Diagnostic Monitoring.
Choose it if these matter
- Carries a Gigabit fiber link up to 20 km over single-mode fiber, far beyond copper Ethernet's 100 m limit
- Digital Diagnostic Monitoring (DDM) reports the module's optical and temperature data on compatible managed switches
- Standard SFP-MSA form factor, hot-pluggable into any SFP slot that accepts 1000Base-LX modules, not just TP-Link switches
Skip it if these rule it out
- Single-mode only: it cannot be used over multimode fiber without additional equipment
- 1.25 Gbps line rate only; 10G SFP+ switches need a faster module, not this one
- Buyers must match a compatible fiber pair and patch cable with LC duplex connectors
Good for: Homelab · Home office · Budget
Which version should you buy?
Selected package: SM311LS, single 1000Base-LX SFP module.
Selected package
SM311LS, single module
This pageModel: TL-SM311LS
- What differs
- One SFP module and an installation guide.
- Best for
- Extending a Gigabit link over single-mode fiber.
Bundles and accessories
Multi-pack SFP modulesModel: TL-SM311LS
Manufacturer details · Multi-pack SFP modulesContents and availability
Bulk listings bundle several SM311LS modules; the module itself is identical.
Buyers provisioning several fiber runs at once.
Watch out
- SM311LS is single-mode (SMF) with LC duplex connectors; the multimode SM311LM looks similar and is for short multimode fiber runs.
- This is a 1.25 Gbps Gigabit SFP module, not a 10G SFP+ module.
Compare with similar models
| Specification |  This oneOmada SM311LS 1000Base-LX SFP Module |  Back-UPS 600VA Battery Backup UPS |  Klein Tools VDV501-851 |
|---|---|---|---|
| Works with | Any SFP slot following the SFP Multi-Source Agreement, including TP-Link managed and smart switches, LC duplex connectors on 9/125 um single-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, Home office, Budget | Backups, Home office, Homelab, Budget | Home office, Homelab, Wired backhaul, Budget |
| Open | View | View |
Full specifications (15)
- Product line
- Omada by TP-Link, 1000Base-LX SMF Mini GBIC Module
- Standards and protocols
- IEEE 802.3z, CSMA/CD, TCP/IP
- Data rate
- 1.25 Gbps
- Wavelength
- 1310 nm
- Fiber type
- 9/125 μm single-mode fiber
- Max. cable length
- 20 km (12.4 miles)
- Port type
- LC duplex
- Hardware features
- DDM (Digital Diagnostic Monitoring), SFP-MSA compliant, hot-pluggable, hot swappable
- Power supply
- 3.3 V
- Safety and emission
- FCC, CE
- Dimensions (W x D x H)
- 2.1 x 0.5 x 0.5 in (55.4 x 13.7 x 12.9 mm)
- Operating temperature
- 0-70 C (32-158 F)
- Storage temperature
- -40 to 85 C (-40 to 185 F)
- Operating humidity
- 10-90% RH non-condensing
- Package content
- SFP module SM311LS, installation guide
Downloads & support
Setup: No drivers needed: the module is managed by the host switch's SFP slot. Check the host switch's compatibility documentation before buying.
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.