TP-Link TL-SM311LS MiniGBIC Module

The TL-SM311LS is the gigabit SFP for long fibre runs. It uses single-mode 9/125 µm fibre at 1310 nm and reaches up to 20 km, so it is the module for links between separate buildings, across a compound or industrial site, out to a remote gate or guard post, or onto a provider's fibre handover.

It fits any SFP slot that accepts 1G modules on switches, routers and firewalls, including TP-Link's JetStream and Omada models, and follows the SFP multi-source agreement. The duplex LC connector matches standard patch cords, and digital diagnostic monitoring lets the switch report received light levels, the quickest way to check a long link.

The module is hot-swappable, powered by the slot at 3.3 V, and rated for 0 to 70 °C. It measures 55.4 x 13.7 x 12.9 mm. Use LS modules at both ends of the link; for short runs over multi-mode fibre, the TL-SM311LM is the right choice.