Cisco QSFP-100G-SR1.2 is a 100 Gigabit Ethernet QSFP28 Bi-Directional (BiDi) optical transceiver designed for short-reach data center interconnect applications. It uses two optical wavelengths over a duplex LC multimode fiber connection, enabling 100Gbps transmission while reusing existing OM3/OM4/OM5 multimode fiber infrastructure.