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TP-Link SM321A-2 Single-Mode WDM SFP (Side A, up to 2 km)
Single-fiber SFP module, side A: a link over one fiber instead of two.
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Type
SFP single-mode WDM (BiDi)
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Connector
LC simplex
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Side
A (Tx 1310 / Rx 1550)
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Speed
1 Gbps
Specifications
- Type
- SFP single-mode WDM (BiDi)
- Connector
- LC simplex
- Side
- A (Tx 1310 / Rx 1550)
- Speed
- 1 Gbps
- Range
- Up to 2 km
Description
The TP-Link SM321A-2 SFP module works with WDM technology: transmit and receive run over a single fiber on different wavelengths. That halves the fiber used in the cable — important when the installed line is already occupied or few fibers are available. The A-side module is paired with a B side, with a range of up to 2 kilometers.
Advantages
- One link on one fiber instead of two — saving a scarce cable resource
- A range of up to 2 kilometers covers links between buildings on a site
- Lets you bring up a new line without laying additional cable
- LC simplex connector and compatibility with standard SFP slots
- Gigabit speed over the whole distance
Applications
- Links between blocks on a plant site
- Connecting remote sites when fibers are scarce
- Extending the network over cable already installed
- CCTV links between remote nodes
Frequently asked questions
Why are different A and B sides needed?
The modules work on opposing wavelengths: the A side transmits on 1310 and receives on 1550, the B side the other way round. A pair of two identical modules will not work.
What if there are enough fibers for both directions?
Then ordinary two-fiber modules are simpler and cheaper. WDM wins precisely when fibers are scarce.
Can modules from different manufacturers be paired?
Technically possible when wavelengths and speed match, but a pair from one manufacturer is more reliable.
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