Description
TP-Link TL-SM331T 1000BASE-T RJ45 SFP Module
The TP-Link TL-SM331T is a 1000BASE-T copper SFP module that adds a standard RJ45 Gigabit Ethernet port to any SFP-equipped switch, router, or NVR. Supporting up to 100 metres over Cat5e or better cabling, it’s the practical solution for installers and network engineers who need to extend a copper Gigabit connection from an SFP slot — without optical fibre or media converters.
Key Features
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1000BASE-T Copper SFP — Converts an SFP slot into a standard RJ45 Gigabit Ethernet port, compatible with existing Cat5e or Cat6 cabling infrastructure.
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100m Reach over Cat5e — Supports the full standard Ethernet distance of 100 metres over UTP Cat5e or above cable.
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Hot-Swappable — Insert or remove the module without powering down the host device, minimising network downtime during maintenance or upgrades.
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IEEE 802.3-2002 Compliant — Fully standards-compliant for broad compatibility with SFP-capable switches, NVRs, and routers from TP-Link and other vendors.
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TX Disable Support — Allows the transmitter to be disabled via software for diagnostics and power management.
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Low Power Consumption — Typical draw of just 0.5W (max 0.8W), minimising heat and energy use in dense switch deployments.
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Fully Metallic Enclosure — Robust all-metal housing provides low EMI emissions and durability in rack and cabinet environments.
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3.3V Power Supply — Standard SFP power rail, compatible with all compliant SFP host systems.
Use Cases
- Adding a copper Gigabit uplink port to a fibre-only or SFP-only managed switch
- Connecting a VIGI NVR or IP camera recorder to a switch via an SFP slot using existing Cat6 cabling
- Extending a Gigabit copper connection from a core switch to an edge device without a media converter
- Replacing a failed or end-of-life SFP copper module in an existing network installation
- Providing a flexible, hot-swappable copper port in a rack-mounted switch for temporary or permanent connections
Technical Specifications
| Specification |
Detail |
| Model |
TL-SM331T |
| Module Type |
1000BASE-T Copper RJ45 SFP |
| Port |
1 × 1000Mbps RJ45 |
| Data Rate |
1.25 Gbps |
| Max Cable Length |
100m (UTP Cat5e or above) |
| Standard |
IEEE 802.3-2002 (1000BASE-T) |
| Hot-Swappable |
Yes |
| TX Disable |
Yes |
| Power Supply |
3.3V (from host SFP slot) |
| Power Consumption |
0.5W typical / 0.8W max |
| Enclosure |
Fully metallic (low EMI) |
| Operating Temperature |
0°C to 70°C |
| Storage Temperature |
-40°C to 85°C |
| Certifications |
FCC, CE |
| Weight |
Approx. 60g |
| In the Box |
TL-SM331T module, Installation Guide |
| Warranty |
2 Years |
Recommended Accessories
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TP-Link TL-SG3210 JetStream Managed Switch — An SFP-equipped managed switch that accepts the TL-SM331T for flexible copper or fibre uplink configurations.
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TP-Link VIGI NVR with SFP Port — Use the TL-SM331T to connect a VIGI NVR to your network via its SFP slot using standard Cat6 cabling.
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Cat6 Ethernet Cable — Recommended for reliable Gigabit performance at the full 100m distance.
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TP-Link TL-SM311LM SFP Module (Multimode Fibre) — If fibre uplinks are needed alongside copper, this companion SFP module covers multimode fibre runs.
Frequently Asked Questions
What is a copper RJ45 SFP module and why would I need one?
An SFP slot on a switch or NVR is typically used for fibre optic connections, but a copper RJ45 SFP module like the TL-SM331T converts that slot into a standard Ethernet port. This is useful when you need an additional copper Gigabit port, want to avoid a media converter, or need to connect to existing Cat5e/Cat6 cabling from an SFP-only uplink slot.
Is the TL-SM331T compatible with non-TP-Link switches?
The TL-SM331T is IEEE 802.3-2002 compliant and uses the standard SFP form factor, making it broadly compatible with most SFP-capable switches and routers from other vendors. However, some managed switches enforce vendor-specific SFP locking — check your switch’s documentation before purchasing.
What cable category is required?
Cat5e or above (Cat6, Cat6A) is required for 1000BASE-T operation at up to 100 metres. Cat5 (not Cat5e) is not recommended for Gigabit speeds at full distance.
Can I insert or remove this module while the switch is running?
Yes. The TL-SM331T is hot-swappable, meaning it can be inserted or removed without powering down the host switch or causing a full system restart. The affected port will go offline briefly during the swap.
Does this module work with TP-Link VIGI NVRs that have an SFP port?
Yes. VIGI NVRs with an SFP uplink slot accept the TL-SM331T, allowing you to connect the NVR to your network switch using standard Cat5e or Cat6 cabling rather than fibre — a practical option when the NVR is within 100 metres of the switch.
