nROK 6221, based on In^® Core™ quad core processor E3950 (up to 2.0GHz), is specifically comply with stringent EN50155 standard in rugged, fanless and compact mechanism. nROK 6221 provides complete communication capability between train and computer with build-in CAN Bus 2.0B interface. nROK 6221 features rich WLAN and WWAN wireless connectivity. With dual SIM cards per modem support, nROK 6221 allows six SIM cards backup each other for a better connectivity quality or extra bandwidth by software. In addition, six SIM cards and three WWAN modules architecture can increase the bandwidth for a faster data transmission speed. Equipped with inligent power management, nROK 6221 can be waked on by ignition, RTC timer or SMS message remoy. By integrating the variety of I/O ports, 3 x mini-PCIe, 2 x M.2 sockets expansibility, up to three screens via VGA and HDMI connections, nROK 6221 keeps the flexibility to meet the demａnd for different rolling stock applications, such as infotainment, dispatching system, cellular/wireless network connectivity, and video surveillance. The design of mini-PCIe slots x 3 can solve the potential request from the market when needed.