Sierra Wireless has added five new AirCard 3G data modems to its lineup, including the AirCard 503, AirCard USB 308/309 and AirCard USB 301/302.

The 503, 309 and AirCard 308 all support high-speed HSPA+ networks, allowing for peak download speeds of 21Mbps. The 503 has a two-in-one design that fits both PC card and ExpressCard slots. The AirCard 503 supports quad-band regular HSPA (850/900/1900/2100MHz) bands.

The AirCard 308 and 309 USB modems have a smaller form factor and connect to a notebook's USB port externally.

The AirCard USB 308 and USB 309 modems sport a new industrial design and performance improvements, including faster installation and setup of Sierra Wireless Watcher(TM) connection manager and a faster browsing experience. The difference of opinion between the II models lies in the HSPA+ absolute frequency bands supported.