SCALANCE X accessory- Active plug-in transceiver SFP991-1A- 1x 100 Mbit/s LC port, optical- multimode optical up to max. 5 km. Plug-in transceivers offer the option of flexibly equipping the modular Layer 2 and Layer 3 Industrial Ethernet switches for optical connections. With an operating temperature range from -40 °C to +85 °C, the plug-in transceivers are especially suitable for use in demanding environments.Modular system results in cost savings. The modular system allows the setup of electrical and optical Industrial Ethernet networks and an easy adaptation and expandability of the network topology and port type to the plant structure. Integrated industrial network for data, speech, and video. High performance thanks to to Gigabit ports.