An SFP (Small Form-factor Pluggable) module is a compact, interchangeable plug-in module that connects network devices such as switches, routers or servers via fibre-optic or copper connections. It is also known as a Mini-GBIC and allows network connections to be flexibly adapted to different transmission media and distances. SFP modules are used in particular in corporate networks, data centres and for connecting network devices over longer distances.
An SFP module is inserted into a compatible slot on a network device. In the case of fibre-optic modules, it converts electrical signals into optical signals and vice versa. With copper modules, however, transmission takes place via electrical signals. The modules can usually be replaced whilst the system is running (hot-swapping). This allows network connections to be flexibly expanded or adapted without having to replace the entire device.
Various SFP variants are available depending on the required bandwidth. They differ mainly in the transmission speeds they support.
| Module type | Typical speed | Range of application |
|---|---|---|
| SFP | 1 Gbit/s | Traditional network connections |
| SFP+ | 10 Gbit/s | Server and switch uplinks |
| SFP28 | 25 Gbit/s | High-performance server and data centre networks |
Important: The various module standards are not fully compatible with one another. Whether, for example, an SFP module will work in an SFP+ port depends on the specific network device and the operating modes it supports.
Single-mode modules are typically used for longer fibre-optic links, whilst multi-mode modules are primarily suitable for shorter distances within buildings and data centres. The actual distance achievable depends on the specific module and cable type.
No. In addition to the correct slot, factors such as transmission rate, module support and, where applicable, manufacturer approval must be taken into account. Some network devices only accept certain modules or require compatible firmware.
