Well, I just found out myself. Use the Xerox Phaser 6000B driver and the printer works just fine. The Linux CUPS driver (English only)  can be found at the Xerox support site ...
Recently I bought a Dell 1250c printer which works perfectly with my Mac. I also have a Linux box. Does anyone know if there are close to compatible driver I can use under CUPS?I already tried de FX Docuprint C525 which seems compatible with the 1320c but no success on this one. BTW it uses HBPL as printer language ...
Dell 1250c printing from Linux?