The gigabit interface converter, or GBIC, was the original hot-swappable standardized form factor and has been widely adopted in a large number of legacy systems, with designs ranging in data rates up to 1.25 Gbps. The GBIC port can support a wide range of physical media, from copper to long-wave single-mode optical fiber, at lengths of hundreds of kilometers. The first generation optical devices had lasers built onto the print circuit of the router or switch which made them really inflexible to upgrade or change. The industry reaction on this issue was to create standardized shapes for transceivers. The transceiver has a laser which communicates to the receiving side of the other optic on the other side.