SCALANCE X Accessories, active plug-in transceiver SFP991-1LD A, 1x 100 Mbit/s LC port, optical, single-mode fiber up to a maximum of 26 km. The SCALANCE SFP991-1LD A plug-in transceivers offer the flexibility to equip modular industrial Ethernet Layer 2 and Layer 3 switches for optical connections. With an operating temperature range of -40 °C to +85 °C, the transceivers are particularly suitable for use in demanding environments. Cost savings through the modular system. The setup of electrical and optical industrial Ethernet networks, as well as network topology and port type, can be easily adapted to the structure of the facility and expanded at any time thanks to the modular system. A continuous industrial network for data, voice, and video. High performance through Gigabit ports.