The driver selected by default by Fedora 11 is not appropriate for Xerox Phaser 3117 - it will not print with it. However there is a very easy solution to the problem.
Go to System -> Administration -> Printing (In GNOME at least, in KDE it’s probably something similar). Right click the Xerox Phaser 3117 printer icon there and select “Properties” from the menu. Then in the “Make and model” section choose change and then select Samsung ML-1710.
After you apply the change you’ve just made, you can start printing with your Phaser.