Xerox CopyCentre C2128 Quick Reference Manual page 86

Sides Scanned
This is used to specify whether the originals are single-sided or double-sided. For
2-sided originals the orientation can also be programmed.
Options:
Use this option for originals that are printed on one side only.
1 S
IDED
Use this option for originals that are printed on both sides.
2 S
IDED
P 4-8
AGE
X C C /W C
EROX OPY ENTRE ORK
P C2128/C2636/C3545 Q
ENTRE RO
R G
UICK EFERENCE UIDE