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The biggest drawback with using Host Print Transform (HPT) is that
you're using iSeries resources to build the bit map (or PCL data
stream), plus network resources to download this information across
your network to the printer. Because EACH PAGE needs to be
transformed and sent, the volume per print job is a lot larger than
IPDS.
If the page count is low or it's a local connection you won't notice
the extra traffic. If the volume increases, you can clog your
network.
The advantage of IPDS is that the variable data is kept separate from
the overlay. The overlay is sent to the printer once and is cached
at the printer; the variable data is all that has to be sent for each
page. As I understand it, the printer should be able to cache
several overlays (depending on available memory). This allows
subsequent print jobs to re-use the overlay and avoid the extra time
to download it.
--Paul E Musselman
PaulMmn@xxxxxxxxxxxxxxxxxxxx
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