HP Color LaserJet CP3520 Printer Series - Manual (Page 35)

Item Values Description
MEDIA SOURCE MAPPING The PCL5 MEDIA SOURCE MAPPING command selects an
input tray by a number that maps to the various available
trays and feeders.
STANDARD* The numbering is based on newer HP LaserJet printers with
updated changes to the numbering of trays and feeders.
CLASSIC The numbering is based on HP LaserJet 4 printers and earlier
models.
ENWW Configure device menu 23