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Small silver SFP transceiver module with LC connector and side label

TP-Link

TP-Link TL-SM321A-2 SFP module TX 1550nm RX 1310nm 2km

SKU CH-1V8S-BGDMW MPN TL-SM321A-2

A 1000Base-BX WDM bi-directional SFP module with LC connector for single-mode fiber links up to 2 km

  • DetailsHARDWARE FEATURES DDM: Yes SFP-MSA: Yes Hot Swappable: Yes M
  • Key featuresDesigned for on-site gigabit fiber communication Up to 2 km
  • Gigabit fiber links up to 2 km over single-mode fiber
  • Bidirectional WDM uses one fiber strand for full-duplex traffic
  • Hot-swappable SFP-MSA module installs without powering down equipment
  • Digital Diagnostic Monitoring gives real-time optical power and temperature data
  • Operates on 3.3 V with FCC and CE safety compliance

Bidirectional gigabit SFP module

The TP-Link TL-SM321A-2 is a 1000Base-BX WDM transceiver that sends data at 1550 nm and receives at 1310 nm over a single strand of 9/125 µm single-mode fibre. It conforms to the SFP-MSA form factor and operates on a 3.3 V supply. Digital Diagnostic Monitoring to SFF-8472 and hot-swappable operation are both supported.

Suited for paired point-to-point links

Network engineers extending gigabit links up to 2 km between switches, routers or servers will use this module with its TL-SM321B-2 counterpart. It is not for buyers who need longer reach, multi-mode fibre compatibility, or a standalone transceiver that does not require a matched pair.

TX 1550 nm / RX 1310 nm wavelength pair

The fixed transmit and receive wavelengths determine which companion module is required and whether the link will function over the installed fibre. Verify that the opposite end uses the complementary 1310 nm TX / 1550 nm RX configuration before purchase.

How it compares

Measured against everything we stock in Switch Modules, Transceivers & Add-Ons, at today’s prices. Recalculated every night.

Price $13.99
Cheaper than about 92% of the 1,517 comparable items (median $68.99).

Specifications

Product
Brand nameTP-Link
Model nameTL-SM321A-2
Size & build
Shipping weight0.07 kg
Package size124 × 79 × 36 mm

Questions about this item

Does the TL-SM321A-2 include the patch cable or must I buy 9/125 µm single-mode fibre separately?

The module has an LC connector and requires 9/125 µm single-mode fibre; the patch cable is not included.

When should I choose the TL-SM321A-2 versus the TL-SM321B-2?

The TL-SM321A-2 transmits at 1550 nm and receives at 1310 nm; the paired TL-SM321B-2 uses the opposite wavelengths, so you need one of each for a link.

What does the 2 km distance mean when the module is installed in a switch?

It supports a full-duplex gigabit link up to 2000 metres over 9/125 µm single-mode fibre when paired with a TL-SM321B-2 module.

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