Xerox Phaser 2135 User Manual page 61

Short-Edge Feed (SEF)
The top of the page should be toward the left of the tray.
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b. Adjust the width and length guides to match the paper size.
From the MBF (Multi-Sheet Bypass Feeder):
a. Load the second side to be printed face-up.
Long-Edge Feed (LEF)
The top of the page should be toward the right of the
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MBF.
It is strongly recommended that you use long-edge feed
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(LEF) for Letter, A4, and JIS B4 paper sizes, except for
business cards, which must be fed short-edge feed (SEF).
User Guide
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0748-47
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