Both the WAN and LAN ports of the pfSense® appliance support auto-MDIX and are capable of utilizing either straight-through or crossover ethernet cables.
Micro-SD card socket (minimum 1GB card recommended)
To install a Micro-SD card:
Remove case screw and slide off chassis lid.
Gently slide the SD card cover toward the network interface port to unlock it.
Raise the lid.
Place the Micro-SD card in the socket, contacts down.
Gently close the SD card cover.
Slide the cover toward the power connector to lock it in place.
If the cover will not close gently, check the alignment of the Micro-SD card as it may not be settled completely into the socket in the correct place.