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Small rectangular SFP module with silver metal housing and black LC port, dust plug inserted

TP-Link

TP-Link SM311LS SFP transceiver 1.25Gbps 1310nm 10km

SKU CH-EXET-8J6VE MPN SM311LS

Single-mode SFP module delivers 1.25 Gbps over 10 km via LC/UPC connectors with plug-and-play operation

  • Port countLC
  • Supported standardsIEEE 802.3z
  • Optical wavelength1310 nm
  • Fiber modeSingle-mode Fiber
  • Supported protocolsCSMA/CD, TCP/IP
  • Transfer speed1.25 Gbit/s
  • Gigabit speeds for 10 km single-mode links
  • Hot-swap insertion keeps networks running during upgrades
  • LC/UPC connector fits standard SFP ports
  • LED status lights confirm link health at a glance
  • Operates from 0 °C to 70 °C in humid environments

Single-mode fibre transceiver

The TP-Link SM311LS is a Gigabit SFP module built for single-mode fibre networks. It operates at a 1310 nm wavelength and delivers a 1.25 Gbps transfer rate over an LC/UPC interface. The module supports full-duplex communication and complies with the IEEE 802.3z standard. LED indicators display the operational status of the link.

Installers extending links up to 10 km

This transceiver suits network engineers connecting switches or media converters across campus or building backbones using 9/125 µm single-mode fibre. It is hot-pluggable and draws power at 3.3 V from the host port. Buyers needing multi-mode fibre compatibility or distances beyond 10 km should select a different module type.

10 km reach on 9/125 µm fibre

The decisive specification is the maximum cable length of 10 km on 9/125 µm single-mode fibre. This range determines whether the module fits the planned link budget. Verify that the host equipment accepts SFP modules and that the fibre plant matches the single-mode requirement before purchase.

How it compares

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

Price $14.99
Cheaper than about 95% of the 1,471 comparable items (median $138.99).

Specifications

Product
Brand nameTP-LINK
Model nameTL-SM311LS
Performance
Transfer speed1.25 Gbit/s
Connectivity
Supported standardsIEEE 802.3z
Optical wavelength1310 nm
Fiber modeSingle-mode Fiber
Supported protocolsCSMA/CD, TCP/IP
Ports & slots
Port countLC
Size & build
Shipping weight0.11 kg
Package size206 × 145 × 41 mm
Environment & compliance
Temperature range0° ~ 70 °C
Humidity range10%~90% non-condensing
More details
Indicator lightsLED indicators show the operation state of the fiber module

Questions about this item

Does the TL-SM311LS include the single-mode fibre patch cable or must that be purchased separately?

The module provides only the LC/UPC interface; a 9/125 µm single-mode fibre patch cable for runs up to 10 km must be bought separately.

How do I decide between this 1310 nm model and a different wavelength SFP?

Choose the TL-SM311LS when your link uses 9/125 µm single-mode fibre and the distance is up to 10 km at 1.25 Gbps; other wavelengths serve different distances or multi-mode fibre.

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

It delivers a full-duplex 1000Base-LX link at 1.25 Gbps over single-mode fibre up to 10 km, with LED indicators confirming the operational state.

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