The Cudy MC100GSB-20B is a Gigabit Ethernet media converter operating at 10/100/1000Mbps, designed for inter-building network connections or long-distance industrial control systems. This device converts Ethernet signals from copper cable (RJ45) to single-mode fiber optic cable, extending the transmission distance from the standard 100 meters of CAT5 cables up to 20 kilometers. Thanks to single-fiber (BIDI) technology, only one fiber cable is required for both data transmission and reception, allowing more efficient use of existing infrastructure. The MC100GSB-20B model transmits data at 1550 nm wavelength and receives at 1310 nm; therefore, it must be used with an MC100GSB-20A model that transmits at 1310 nm and receives at 1550 nm. Technically, this converter is fully compliant with IEEE 802.3, 802.3u, 802.3z, and 802.3x standards, and features automatic MDI/MDI-X detection, eliminating the need for straight or crossover cables. With a high-performance 1.4Gbps memory bandwidth and 2MB buffer memory, it minimizes data loss while keeping latency below 9.6 µs. The device operates reliably in temperatures from 0°C to 60°C and offers energy efficiency with only 4W power consumption. Powered by an external power adapter, the product has compact dimensions (26mm x 70mm x 95mm) for easy installation in tight spaces. This media converter is ideal for users who want to establish a reliable, high-speed fiber optic connection between campus networks, factory sites, warehouses, and office buildings. It provides an economical and practical way to extend your network over kilometers while preserving your existing copper infrastructure. It is also widely preferred in industrial control systems, security camera networks, and scenarios where remote devices need to be integrated into a central network. Technical Specifications: - Standards: IEEE 802.3, 802.3u, 802.3z, 802.3x - Speed: 10/100/1000 Mbps - Fiber Distance: 20 km - Fiber Type: Single Mode - Fiber Connector: SC - Fiber Type: Single Fiber (BIDI) - Wavelength (TX): 1550 nm - Wavelength (RX): 1310 nm - RJ45 Port: 1 x 10/100/1000Base-T - Power Consumption: 4W - Operating Temperature: 0°C - 60°C - Dimensions: 26mm x 70mm x 95mm (External Power)