TP-Link Single-Mode WDM SFP Module
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About This Item
- Single-mode WDM SFP transceiver module
- LC (UPC) fiber optic connector
- 1000BASE-BX standard, 1250 Mbit/s data rate
- Up to 1000 m transmission distance
- Hot-swappable, metallic finish
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TP-Link TL-SM321A | Single-Mode WDM SFP Module
The TP-Link Gigabit Single-Mode WDM Bi-Directional SFP Module (TL-SM321A) delivers reliable 1000BASE-BX fibre connectivity over a single strand of fibre, using wavelength-division multiplexing to transmit data in both directions simultaneously. Designed for network extensions up to 10 km, it’s ideal for long-distance links where fibre infrastructure is limited.
Quick Specs
| Metric | Spec |
|---|---|
| Wavelength (Tx/Rx) | 1550 nm / 1310 nm |
| Max Transfer Distance | 1000 m |
| Connector Type | LC (UPC) |
| Data Rate | 1250 Mbit/s |
| Fibre Type | Single-mode 9/125 µm |
Long-Distance Fibre Connectivity
The TL-SM321A uses advanced WDM technology to send and receive data over a single strand of single-mode fibre. By transmitting at 1550 nm and receiving at 1310 nm, it maximises fibre utilisation without requiring separate transmit and receive fibres, making it perfect for campus or building-to-building links where fibre is scarce.
Hot-Swappable & Easy Integration
With hot-swap capability and standard SFP form factor, this module slots directly into any compatible networking equipment without powering down the system. Its IEEE 802.3z compliance ensures broad compatibility with enterprise switches, routers, and media converters that support 1000BASE-BX.
Robust Environmental Performance
Built to operate reliably in challenging environments, the TL-SM321A functions between 0 °C and 70 °C, with storage tolerance from -40 °C to 80 °C. It also withstands relative humidity from 10 % to 90 % during operation, making it suitable for industrial, outdoor, or unheated premises.
CE & RoHS Certified
This module meets CE and FCC certification requirements and complies with RoHS standards for restricted substances, ensuring it adheres to UK and EU regulatory frameworks for safe operation and environmental responsibility.
Box Contents
- TP-Link TL-SM321A SFP module
- Product documentation
Check Before You Buy
- Confirm your networking equipment supports 1000BASE-BX SFP modules.
- Verify your existing fibre infrastructure uses single-mode 9/125 µm cable.
- Check wavelength compatibility if pairing with third-party WDM equipment.
- Ensure your operating environment stays within 0–70 °C for reliable performance.
Frequently Asked Questions
Q: Can I use this module with multi-mode fibre?
A: No, this module only supports single-mode fibre (9/125 µm). Multi-mode fibre is not compatible.
Q: What is the maximum distance I can achieve with this SFP?
A: The module supports up to 1000 m with single-mode fibre, though TP-Link states up to 10 km when paired with compatible equipment.
Q: Is this module hot-swappable?
A: Yes, it features hot-swap capability for installation without powering down your networking equipment.
Q: What wavelengths does this module use?
A: It transmits at 1550 nm and receives at 1310 nm using WDM technology.
Q: Does this module require any special power supply?
A: No, it draws 3.3 V from the host device’s SFP port and requires no external power.
The Consultant’s Verdict & Warranty
The TP-Link TL-SM321A is a dependable choice for extending Gigabit Ethernet over long single-mode fibre runs where space and infrastructure are limited. Its WDM bi-directional design, hot-swap capability, and environmental resilience make it suitable for enterprise, industrial, and service-provider applications. Covered by the standard Manufacturer Warranty.
| Performance | |
|---|---|
| SFP transceiver type | Fiber optic |
| Tx wavelength (max) | 1550 nm |
| Rx wavelength (max) | 1310 nm |
| Wavelength-division multiplexing (WDM) | Yes |
| Fiber optic connector | LC (UPC) |
| Networking standards | IEEE 802.3z |
| Maximum transfer distance | 1000 m |
| Fiber cable diameters supported (core/cladding) | 9/125 µm |
| Maximum data transfer rate | 1250 Mbit/s |
| Interface type | SFP |
| Single-mode fiber (SMF) supported | Yes |
| Multi-mode fiber (MMF) supported | No |
| SFP transceiver standard | BX |
| Fiber ethernet cabling technology | 1000BASE |
| Product colour | Metallic |
| Hot-swap | Yes |
| Harmonized System (HS) code | 85369010 |
| Features | |
| Product colour | Metallic |
| Hot-swap | Yes |
| Certification | CE, FCC |
| Power | |
| Input voltage | 3.3 V |
| Certificates | |
| Certification | CE, FCC |
| Compliance certificates | RoHS |
| Operational conditions | |
| Operating temperature (T-T) | 0 - 70 °C |
| Storage temperature (T-T) | -40 - 80 °C |
| Operating relative humidity (H-H) | 10 - 90% |
| Storage relative humidity (H-H) | 5 - 90% |
| Network | |
| SFP transceiver type | Fiber optic |
| Fiber optic connector | LC (UPC) |
| Networking standards | IEEE 802.3z |
| Maximum data transfer rate | 1250 Mbit/s |
| Interface type | SFP |
| Packaging content | |
| Quantity per pack | 1 pc(s) |
| Technical details | |
| Package width | 81.5 mm |
| Package height | 38.5 mm |
| Hot-swap | Yes |
| Maximum transfer distance | 1000 m |
| Fiber cable diameters supported (core/cladding) | 9/125 µm |
| Compliance certificates | RoHS |
| Packaging data | |
| Package depth | 122.5 mm |
| Package width | 81.5 mm |
| Package height | 38.5 mm |
| Package weight | 60 g |
| Weight & dimensions | |
| Package depth | 122.5 mm |
| Package width | 81.5 mm |
| Package height | 38.5 mm |
| Package weight | 60 g |
| Logistics data | |
| Quantity per pack | 1 pc(s) |
| Harmonized System (HS) code | 85369010 |
| Identifiers | |
| Distributor SKUs | 70202, 9852514, 17568, STD10217448, NS70202 |
| Additional EANs | 1210002612074 |
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