In fiber optic networks, LC and SC duplex connectors are widely used for reliable data transmission, each featuring two fibers—one designated for transmit (Tx) and the other for receive (Rx). Whether you're upgrading a workstation, scaling a small business network, or building out a hyperscale data center, a fiber network card (NIC, network interface card) is one of the most critical components for connectivity. Its primary function is to achieve optoelectronic conversion by converting electrical signals into optical signals and vice versa. An. These two components operate at different layers of the OSI model but work together to complete every Ethernet communication.