The FleetBroadband Sailor FB250 controller (which is the same for the Sailor FB500) includes (from right to left) a "L" band pass through port (optional use), the external antenna port, an analog phone and fax port (standard phone or fax machine), ISDN port (Functional with FB500 antenna only) a 4Port LAN (DHCP for up to 250 connected computers/phones), power port, an input connector (optional use), the power switch and grounding. The unit boots in 2 seconds, and will automatically locate and lock on satellite.