From Soekris Info Wiki
faster mid-range communications mainboard, with a 433 to 500 Mhz Geode LX
Soekris Engineering net5501
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 1 Gbyte 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 will be 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.
Hardware and Software
* 433 to 600 Mhz AMD Geode LX single chip processor with CS5536 companion chip * 128-1024 Mbyte DDR-SDRAM, soldered on board * 4 Mbit BIOS/BOOT Flash * CompactFLASH Type I/II socket, 8 Mbyte to 32 Gbyte FLASH or Microdrive * 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 with 2KW/100A TVS * 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
* Standard case with 1 PCI slot, 6.7" x 11.4" x 1.3". * 1U 19" rackmount with with 2 PCI slots (available October 2007).
* 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
Replacement Internal Battery:
* net4801, net5501: Panasonic ML1220/V1AE - available from DigiKey and others.