All,
As requested, here are the PSX implementation details for CUPS:
"Support for the IPP Printer State Reasons Extensions (PSX) was
included in CUPS 1.3.0, which was released on August 13, 2007.
The CUPS implementation supports all of the PSX attributes and
values and acts a proxy for data from actual printers. The
implementation was trivial and the internal interface supports
any source of alert and state information, not just the Printer
MIB."
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Michael R Sweet Senior Printing System Engineer