Sony VGN-FS550 - Manual (Page 96)

Locating Ports and Jacks
The printer port on this port replicator is intended for printer connections only.
Port Replicator (Back Panel)
1 DC IN port 4 Printer port
2 Network (Ethernet) port (10BASE-T/100BASE-TX) 5 USB 2.0 ports
3 Monitor (VGA) port
Page 96