Featuring dedicated GPS antenna port, Models MRD-315 and MRD-355 support many mobile standards including GSM, GPRS, EDGE, 3G UMTS, HSDPA, and HSUPA allowing uplink transfer rates up to 21.0 Mbps. Mobile broadband units combine DIN-rail mounting, operating temperature of -40 to +70°C, and operating voltage spanning 10–60 Vdc. Both provide built-in two port 10/100 Ethernet switch and RS-232 D-Sub, which allows any type of devices to seamlessly connect over vast geographical distance.