Dell 5100cn Color Laser Printer User Manual page 273

The parameters for selecting a paper tray are as follows.
1
Feed paper from tray 1 (standard 500-sheet tray).
2
Feed paper from tray 2 (optional 500-sheet tray module or 1000-sheet tray module).
3
Feed paper from tray 3 (optional 1000-sheet tray module).
4
Feed paper from tray 4 (optional 1000-sheet tray module).
A4
Feed paper from the tray loaded with A4 (210 x 297 mm).
A5
Feed paper from the tray loaded with A5 (148 x 210 mm).
A6
Feed paper from the tray loaded with A6 (105 x 148 mm).
B5
Feed paper from the tray loaded with B5 (182 x 257 mm).
LT
Feed paper from the tray loaded with Letter (8.5 × 11 inches).
FL
Feed paper from the tray loaded with Folio (8.5 × 13 inches).
LG
Feed paper from the tray loaded with Legal (8.5 × 14 inches).
EX
Feed paper from the tray loaded with Executive (7.25 × 10.5 inches).
MO
Feed paper from the tray loaded with Monarch (3.875 × 7.5 inches).
COM10
Feed paper from the tray loaded with Envelope #10 (4.125 × 9.5 inches).
DL
Feed paper from the tray loaded with DL (110 x 220 mm).
C5
Feed paper from the tray loaded with C5 (162 x 229 mm).
LP 210x900
Feed paper from the tray loaded with LP210x900 (210 x 900 mm).
MxNmm
Feed paper from the tray loaded with MxN mm defined by users.
Possible range specified:
Width: 88.9 to 215.9 mm
Length: 139.7.8 to 355.6 mm
MxNin
Feed paper from the tray loaded with MxNinches defined by users
Possible range specified:
Width: 3.50 to 8.50 inches
Length: 5.50 to 14.0 inches
If this option is not specified or the tray specified is not available, feed paper from the default tray.