Cisco GBIC (Gigabit Interface Converter) modules are transceivers used to connect network devices to fiber optic or copper networks. They are hot-swappable, meaning they can be inserted and removed from a network device without having to power down the device. GBICs are available in a variety of speeds, ranging from 100 Mbps to 10 Gbps, and are compatible with a variety of Cisco switches and routers. They are also available in a variety of form factors, including SFP, SFP+, X2, and XENPAK. GBICs are an ideal solution for connecting devices over long distances, as they provide reliable, high-speed connections.