The RTM-5101 is a single slot (6HP) ATCA rear transition module for I/O extension of Advantech ATCA CPU blades. To meet serviceability, RTM-5101 is designed as a fully managed, and hot swappable FRU. On board SAS controller (LSI logic: LSI1064) supports two 2.5" hot swappable SAS HDDs which operates up to 3.0 Gbit/s and provides external mini SAS connectors on rear panel for failover cabling. Via usb-to-UART transceiver, frontboard UART can be exported to miniUSB connector on RTM (if frontboard UART MUX is routed accordingly.) Two Ethernet GbE ports provide extra two I/O Lans for rear access. Two USB ports (USB 2.0) support versatile USB devices (keyboard, mouse, USB stick, USB-CDROM…etc). One PCI Express x1 interface supports one mini PCIe socket for flexible expansion. Advantech provides mini PCIe VGA module (optional) for debugging purpose.