even better for Xerox, use a built in Apple LaserWriter driver, such as 8500 v3010.103, which supports Tabloid (11x17) paper size, and allows you to tick that a duplexer is included
or use files on cscf-macdepot
Install Drivers ( Admin Access is needed)
Make sure that Printer Sharing is turned off System Preferences/Sharing/Services/Print Sharing
Add the printer
Access Printer Setup Utility (/Applications/Utilities) on your Macintosh * select "Add"
Select "IP printing" from Printer list (top menu)
Printer type "LPD/LPR"
Printer Address "129.97.XXX.XXX" (or its canonical name, eg: ljp-cs-3)
Queue Name "lp" (only for Ricoh printers, which have an internal queue)
Select applicable printer model from list
Apply changes
After printer is added Select "Show Info" and verify everything is correct, then...
Add printer options
Select "Installable Options"
Activate the installed options as machine functions dictate (duplexing, for instance)
Apply Changes and close window
Notes for Mac users
make sure that the Ricoh has a PostScript2 board installed
Information in this area is meant for use by CSCF staff and is not official documentation, but anybody who is interested is welcome to use it if they find it useful.