This compact, low-power, low-cost, advanced communication computer is based on an up to 500 Mhz 586 class processor. It has four 10/100 Mbit ethernet ports, up to 512 Mbyte DDR-SDRAM main memory and uses a CompactFlash module for program and data storage. It can be expanded using a MiniPCI type III board, a hard drive and one or two low-power standard PCI board. It has been optimized for use as a Firewall, VPN Router, Internet Gateway and VoIP PBX, but has the flexibility to take on a whole range of different functions as a communication appliance. The board is designed for long life and low power. It is available in any volume in the standard version, and as board only or with a small metal box and various power supplies. The board can be customized according to requirements when ordering higher volume. With an HDD mounting kit you can install a 2.5" HDD on top of the board. Standard stock configurations: 5501-60: 433 Mhz CPU, 256 Mbyte DDR-SDRAM, 4 Ethernet, 2 Serial, USB connector, CF socket, 44 pins IDE connector, SATA connector, 1 Mini-PCI socket, 3.3V PCI connector. 5501-70: 500 Mhz CPU, 512 Mbyte DDR-SDRAM, 4 Ethernet, 2 Serial, USB connector, CF socket, 44 pins IDE connector, SATA connector, 1 Mini-PCI socket, 3.3V PCI connector. Specifications: 433 to 500 Mhz AMD Geode LX single chip processor with CS5536 companion chip 128-512 Mbyte DDR-SDRAM, soldered on board 4 Mbit BIOS/BOOT Flash CompactFLASH Type I/II socket. UltraDMA-100 interface with 44 pins connector for 2.5" Hard Drive Serial ATA 1.0 interface for Hard Drive, with +5V and +12V power header 1-4 VIA VT6105M 10/100 Mbit Auto MDIX Ethernet ports, RJ-45, protected to 700W/40A Surge 2 Serial ports, DB9 and 10 pins internal header USB 2.0 interface, one internal, one external port Power LED, Disk LED, Error LED, Network LED's Mini-PCI type III socket. (for t.ex. hardware encryption or wireless controller) PCI Slot, right angle 3.3V signaling only, dual PCI slot option 12 bit general purpose I/O, 20 pins header Temperature and voltage monitor Hardware watchdog Board size 6.3" x 6.5" Power using external power supply is 6-25V DC, max 20 Watt, protected with TVS Option for 5V supply using internal connector Operating temperature 0-60 °C Cases available: Standard case with 1 PCI slot, 6.7" x 11.5" x 1.3". 1U 19" rackmount with with 2 PCI slots (available Q4 2009). Software: comBIOS for full headless operation over serial port PXE boot rom for diskless booting Designed for FreeBSD, NetBSD, OpenBSD and Linux Runs most realtime operating systems