Certificates
Certification	FCC, CE
Features
Product colour	Silver
Operational conditions
Minimum operating temperature	0 °C
Maximum operating temperature	70 °C
Operating temperature (T-T)	0 - 70 °C
Storage temperature (T-T)	-40 - 80 °C
Packaging content
Quantity per pack	1 pc(s)
Packaging data
Package width	81.5 mm
Package depth	122.5 mm
Package height	38.5 mm
Package weight	60 g
User guide
Performance
SFP transceiver type	Fiber optic
Maximum data transfer rate	1250 Mbit/s
Interface type	SFP
Fiber cable diameters supported (core/cladding)	50/125 µm
Maximum transfer distance	300 m
Wavelength	850 nm
Ethernet interface type	Gigabit Ethernet
Networking standards	IEEE 802.3ae
Multi-mode fiber (MMF) supported
Ethernet LAN
Power
Input voltage	3.3 V
Weight & dimensions
Width	67.4 mm
Depth	13.8 mm
Height	13.8 mm

The TP-Link TL-SM331T is an SFP transceiver for use in networks, providing a Gigabit Ethernet connection over copper cables. The module enables connection between an SFP slot and an RJ45 Gigabit port, with data transmission possible up to a distance of 100 metres using UTP cables of Category 5e or higher. It is specifically designed for use in commercial environments and complies with the IEEE standard 802.3-2002. The maximum data transfer rate is 1250 Mbit/s, equivalent to a speed of 1.25 Gbit/s. The module is designed for operation in a temperature range of 0 to 70 °C and can withstand storage temperatures from -40 to 80 °C.

Applications
This module is used in network switches, routers, or other devices equipped with an SFP slot to establish a copper connection to a Gigabit port. It is particularly suitable for environments where fibre optic cables are not available or not required, but high transmission rates and stable connections over medium distances are needed. The use of Cat 5e or higher cables ensures reliable signal transmission without data loss.

Functions and Features in Detail
The TL-SM331T supports 1000BASE-T operation in host systems and is therefore suitable for Gigabit Ethernet applications. It features a TX disable function, allowing the transmitter to be temporarily turned off, which can be useful during maintenance or to reduce power consumption. The module is hot-pluggable, meaning it can be inserted into or removed from the SFP slot without shutting down the device. The fully metallic housing ensures low electromagnetic emission (EMI), minimizing interference with other devices and enhancing signal integrity.

Technology Explained Simply
The module operates with an input voltage of 3.3 V and typically consumes 0.5 W, with a maximum of 0.8 W. Power supply is provided via the network cable, which is plugged into the SFP slot of the host device. The SFP interface is a standard for small form-factor transceivers, widely used in many network devices. Connection to the copper cable is made via an RJ45 connector, which is connected to a standard network cable. The maximum range of 100 metres is achieved when using Cat 5e or higher cables.

Compatibility and Accessories
The module is compatible with various network devices from different manufacturers, including TP-Link, Cisco, Huawei, Ubiquiti, D-Link, Netgear, and Mikrotik. Compatibility is based on adherence to the SFP form factor and the IEEE-802.3-2002 standard. No special accessories are required, as the module is inserted directly into the SFP slot. Connection to the copper cable is made via a standard RJ45 cable.

Installation and Mounting
Installation is performed by simply inserting the module into the SFP slot of the network device. No tools or special technical effort is required. Connection to the copper cable is made via the RJ45 connector. Operational readiness is immediate after insertion, as the module is hot-pluggable.

Operational Advantages
The module provides a reliable and fast connection over copper cables without requiring fibre optic cables. The low power loss and metallic housing ensure stable and interference-free signal transmission. The hot-plug function enables flexible and maintenance-friendly use, especially in environments where network downtime should be avoided. Compatibility with various devices increases flexibility in equipment selection.

The product is delivered in packaging that includes a user manual. The module itself is silver-coloured and has dimensions of 67.4 mm (width) × 13.8 mm (depth) × 13.8 mm (height). The packaging has dimensions of 81.5 mm (width) × 122.5 mm (depth) × 38.5 mm (height) and weighs 60 g. The module is designed for use in commercial environments and complies with FCC and CE certifications.