A 1.25G SFP (Small Form-factor Pluggable) module, SM (Single Mode), Single Fiber, 120KM, 1310/1550, LC Connector, supports high-speed data transmission over single-mode fiber optics for distances up to 120 kilometers. It operates at 1.25 Gbps, transmitting at 1310 nm and receiving at 1550 nm wavelengths. Ideal for telecom and enterprise networks requiring reliable connectivity over long distances with minimal signal loss and efficient performance.