TP-Link TL-SM311LM Gigabit SFP Module
Overview
The TL-SM311LM is a 1000Base-SX multi-mode fiber SFP (Small Form-factor Pluggable) transceiver module designed to extend gigabit network connectivity over fiber optic cable. It supports distances up to 550 meters on multi-mode fiber, making it suitable for campus network backhauls, warehouse automation infrastructure, and inter-building IP surveillance deployments where copper Ethernet runs are impractical. The MiniGBIC form factor fits standard SFP ports on managed switches, routers, and network appliances.
Compatibility
The TL-SM311LM works with any networking device featuring a standard SFP slot — including managed network switches, industrial routers, and fiber-equipped NVRs. Verify your target device supports the SFP form factor and accepts 1000Base-SX transceivers before ordering. The LC connector is the industry standard for SFP modules.
Technical Specifications
Operates at gigabit speeds (1.25 Gbps signaling rate, 1000 Mbps throughput). The multi-mode fiber specification allows distances to 550 meters at full bandwidth — adequate for most facility-scale network extensions. For longer runs, consider single-mode variants; for shorter distances under 275 meters, dual-rate operation is supported. Power consumption and operating temperature limits are minimal for a passive optical transceiver; thermal management is typically not a concern in standard network cabinets.
When to Choose Differently
If your run exceeds 550 meters or requires single-mode fiber (SM) characteristics, a single-mode TL-SM311SM variant or higher-grade transceiver may be necessary. If you need active diagnostics (DDM/DOM — Digital Diagnostic Monitoring), confirm your switch supports DDM-capable transceivers and select accordingly. Verify fiber termination quality before deployment — dirty or misaligned LC connectors degrade performance significantly.
