Your switch has the SFP slot. The other building is 400 metres away. Copper can't get you there without a repeater on every corner of the car park. The SM311LM drops into that slot, you run a multi-mode fibre link, and your LAN stretches to 550 m clean.
1.25 Gbps full-duplex over 50/125 μm or 62.5/125 μm multi-mode fibre. LC/UPC connector — the same patch leads you already have in the patch panel. Hot-swap supported: pull it out or plug it in while the switch is powered, no downtime.
Powered internally by the host switch at 3.3 V. No extra adapter, no wall socket. FCC and CE certified. Works across a wide range of TP-Link managed and smart switches — check the compatibility list before you order.
0 to 70 °C operating range handles a server cupboard in summer without a drama. Plug it in, patch the fibre, link up
| brand | TP-Link |
| model | SM311LM |
| type | Multi-mode Mini GBIC SFP module |
| wavelength | 850 nm |
| data_rate | 1.25 Gbps |
| max_cable_length | 550 m |
| fiber_type | 50/125 μm or 62.5/125 μm multi-mode |
| port_type | LC/UPC |
| standards | IEEE 802.3z, CSMA/CD, TCP/IP |
| power_supply | 3.3 V (internal from host switch) |
| certifications | FCC, CE |
| operating_temperature | 0–70 °C |
| storage_temperature | -40–80 °C |
| operating_humidity | 10%–90% non-condensing |
| storage_humidity | 5%–90% non-condensing |
