Siemens Communications recently succeeded in completing the first live data transfer with SkyMAX, a new end-to-end WiMAX ( Worldwide Interoperability for Microwave Access) solution based on the IEEE 802.16-2004 standard, in its test lab in Milan, Italy . During the live link between a modem and a base station in the 3.5 GHz frequency spectrum, data was transmitted at a top speed of up to 12 megabits per second in 3.5 MHz bandwidth. Transmission rates as high as this had only previously been achieved with early proprietary systems.