TP-Link SM311LS Gigabit Single-Mode SFP Module
Overview
The SM311LS is a hot-pluggable single-mode fiber transceiver module designed to extend network reach across campus or warehouse sites where 20 km of optical fiber separation is required. Single-mode fiber carries a 1 Gigabit Ethernet signal over longer distances than multimode, making it the standard choice for security backbone links connecting managed network switches across buildings or between facility zones. The LC connector is industry-standard for security and enterprise networking.
Compatibility
The SM311LS is a MiniGBIC (Small Form Factor Pluggable) module compatible with TP-Link Omada-series managed switches and other equipment with standard SFP slots. Verify your switch or NVR has an available SFP port before ordering. This is a passive transceiver — it requires single-mode LC fiber patch cables (sold separately) to connect endpoints.
Specification Summary
Wavelength & Distance: 1000Base-LX standard wavelength optimized for single-mode fiber. The 20 km maximum range assumes proper fiber grade and low-loss termination — verify your fiber plant meets standards before deployment. Form Factor: Hot-pluggable design allows installation or replacement without powering down the switch or disrupting active ports. Power: Passive module — requires no additional power supply beyond the host equipment's SFP power rail.
When to Choose a Different Module
If your fiber run is under 2 km, a multimode SFP module may offer lower installed cost. If you need higher speeds (10G or beyond), consult TP-Link's 10 Gigabit SFP+ lineup. For runs exceeding 20 km or requiring wavelength multiplexing, coordinate with a fiber optics specialist.
