Phaser 3500 ignores lp -o media=COM10

Morning.

I want to print on paper with dimensions like US envelopes (241 mm x 105
mm) but not in landscape but in portrait mode (separators for lever arch
files).

..------.
| ° ° |
| |
| |
| |
| |
| |
| |
| text |
'------'

So I've given the input

lp -o media=COM10,Upper filename

But the printer (Xerox Phaser 3500) prints nothing onto the paper in the
upper tray. So I've checked out the behaviour of the printer and
inserted for this purpose an *** of A4 paper. Now the printer prints
as shown:

..---------------.
| |
| |
| |
| |
| |
| |
| |
| |
| text |
'---------------'

Obviously the printer ignores the Option media=COM10.

Why? What can I do to force the printer to print out on media?

Thanks in advance and kind regards, Friedrich


--
Kinderlärm ist Zukunftsmusik.

vatolin (at) mac (dot) com
.