SCALANCE X accessories, active plug-in transceiver SFP991-1A, 1x 100 Mbit/s LC port, optical, multimode glass up to max. 5 km. SCALANCESFP991-1A plug-in transceivers offer the option of flexibly equipping modular Industrial Ethernet Layer 2 and Layer 3 switches for optical connections. With an operating temperature range of -40 °C to +85 °C, the plug-in transceivers are particularly suitable for use in demanding environments.¿ Cost savings thanks to the modular system. The structure of electrical and optical Industrial Ethernet networks as well as the network topology and port type can be easily adapted to the structure of the system and expanded at any time thanks to the modular system. ¿ Consistent industrial network for data, voice and video. ¿ High performance thanks to Gigabit ports.