I recently had the opportunity to test out a CX111.
Its a device that acts as a L2 bridge between a 3G/4G USB modem connected to one of 3 available USB ports on it and a single Ethernet port.
http://www.juniper.net/au/en/products-services/routing/srx-series/cx111/
Specifically I tested it with a Telstra 4G Sierra Wireless AirCard 320U.
And the results were great!
