The GLC-ZX-SM-RGD is a high-quality SFP module that provides Gigabit Ethernet connectivity over long distances using single-mode fiber optic cables. It supports the 1000BASE-ZX standard, which allows it to transmit data at Gigabit Ethernet speeds over distances of up to 80 kilometers. The SFP module operates at a wavelength of 1550nm, making it suitable for long-range communication. It features an LC (Lucent Connector) interface for easy and reliable fiber optic cable connection.