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Small rectangular SFP module with silver metal casing and black LC port visible

TP-Link

TP-Link TL-SM311LM SFP transceiver 1000Base-SX 850nm 550m

SKU CH-1C4G-23R2V MPN TL-SM311LM

Gigabit SFP transceiver extends network links up to 550 metres over multi-mode fibre with an LC interface

  • Port countLC
  • Supported standardsIEEE 802.3z
  • Optical wavelength850 nm
  • Fiber mode50/125um or 62.5/125um Multi-mode Fiber
  • Supported protocolsTCP/IP
  • Transfer speed1.25 Gbit/s
  • Extends network reach up to 550 m over multi-mode fibre
  • Ready to use instantly with plug-and-play installation
  • Fits existing SFP ports on listed TP-Link switches
  • Operates at 850 nm wavelength for short-range links
  • Supports full-duplex Gigabit throughput at 1.25 Gbps

Product identity

The TP-Link TL-SM311LM is a Gigabit SFP transceiver designed for network administrators who need to link switches or media converters over multi-mode fibre. It plugs directly into compatible TP-Link JetStream and managed switch ports to extend LAN connections beyond copper limits.

Distance limits

The module operates at an 850 nm wavelength over 50/125 µm or 62.5/125 µm multi-mode fibre. It reaches up to 550 m with 50/125 µm cable and up to 275 m with 62.5/125 µm cable, so the fibre grade in your installation decides the maximum link length.

Deciding specification

The LC duplex interface and 1.25 Gbps transfer rate define whether this transceiver matches your switch port and speed requirement; verify that your hardware lists SFP 1000Base-SX support before purchasing.

How it compares

Measured against everything we stock in SFP & SFP+ Transceiver Modules, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 96% of the 1,471 comparable items (median $138.99).

Specifications

Product
Brand nameTP-Link
Model nameTL-SM311LM
Performance
Transfer speed1.25 Gbit/s
Connectivity
Supported standardsIEEE 802.3z
Optical wavelength850 nm
Fiber mode50/125um or 62.5/125um Multi-mode Fiber
Supported protocolsTCP/IP
Ports & slots
Port countLC
Power
Power adapter3.3 V
Size & build
Shipping weight0.10 kg
Package size206 × 147 × 38 mm

Questions about this item

Which TP-Link SFP module should I choose for multi-mode fiber runs up to 550 metres?

The TL-SM311LM is a 1000Base-SX MiniGBIC that reaches 550 m over 50/125 µm multi-mode fiber and 275 m over 62.5/125 µm fiber, matching the 850 nm wavelength and LC/UPC connector your links require.

What does the 1.25 Gbps transfer rate mean when the module is installed in a switch?

It delivers full-duplex Gigabit Ethernet at line rate across the SFP port, so a 1000Base-SX link runs at 1.25 Gbps without throttling, provided the switch port and fiber type support the stated distance.

Does the LC/UPC interface limit the distance or speed compared with other connectors?

The LC/UPC connector is the standard physical interface for 1000Base-SX; it does not cap speed or distance — the 550 m / 275 m reach is determined by the 850 nm optics and the multi-mode fiber grade you use.

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