Dell 3100cn Color Laser Printer - Manual (Page 206)

To disable tray linking, set the Paper Size and Paper Type to a unique value in each one of the trays. If all trays do not have the same type of print media
when linked, you could mistakenly print a job on the wrong paper type.
Using the Duplex Function
Duplex printing (or two-sided printing) allows you to print on both sides of a sheet of paper. For sizes that are acceptable for duplex printing, see " Print Media
Sizes and Support ."
Using Duplex Bind
When using duplex bind printing in the printer driver, you must select either Flip on Short Edge or Flip on Long Edge. Binding in the Duplex menu item defines
the way duplexed pages are bound, and how the printing on the back of the sheet (even-numbered pages) is oriented in relation to the printing on the front
(odd-numbered pages).
The two values for Binding are:
Using the Center Output Tray
The center output tray holds up to:
l 250 sheets (20 lb (75 g/m 2 )) of plain paper: or
l 20 sheets of transparency: or
Long
Edge Assumes binding along the long edge of the page (left edge for portrait orientation and top edge for landscape orientation). The following
illustration shows long-edge binding for portrait and landscape pages:
Short
Edge Assumes binding along the short edge of the page (top edge for portrait orientation and left edge for landscape orientation). The following
illustration shows short-edge binding for portrait and landscape pages:
NOTE: When you print on both sides of postcard-size paper, make sure the paper is not curled.