The general concept is to provide networking options and some GPIO. Provide basic 4-ports of 10/100 Ethernet, perhaps with the option of plugging in a POE injector daughterboard, and provide the option to plug in a USB-based 3G MiniPCIe with 2 SIM Card slots (selection controlled by GPIO) and a USB-based MiniPCIe WIFI Card.
The router board will conceptually be an expansion of the 2nd revision Micro Engineering Board and so will also provide a SATA interface and a 44-pin header for access to the RGB/TTL and I2C.
- http://hands.com/~lkcl/eoma/router/rtl8366s_8366sr_datasheet_vpre-1.4_20071022.pdf 5-port 10/100/1000 with I2C Interface as shown here: http://wiki.openwrt.org/_media/inbox/tl-wr1043nd_v14.jpg
- USB MiniPCIe 3G Modem socket with Dual-SIMs (GPIO-controlled)
- 2nd USB MiniPCIe socket for other devices (USB-based WIFI Cards)
- 9-pin RS232 port with MAX3232 for 3.3v - 5.5v compatibility
- SATA interface
Schematics here: http://git.rhombus-tech.net/?p=eoma.git;a=tree;f=pcb/router; Information available at the news page.