Xerox 96MX - Manual (Page 183)

PRINT FORMAT COMMANDS
XEROX DOCUPRINT 96/DOCUPRINT 96MX LPS PDL REFERENCE 6-9
Recovery
The automatic recovery procedures of the LPS are based on the
availability of valid checkpoint data independently saved by both the
output processor and the input processor. As a result, most
recoveries are performed with no operator assistance. In certain
cases, the system may detect that the checkpoint data is invalid, and
operator assistance is requested, that is, the operator or user is
requested to mount a preceding tape volume (offline) or return to
point of origin or last valid checkpoint (online).
Marker page
The system produces a marker page (refer to figure 6-1) as a function
of the input processor and inserts it into the print job at the point of
crash. It is printed after the output processor has printed data that
was already processed by input before the crash occurred.
Note: Actual size is 8.5 by 11 inches, and the squares at the top
and bottom of the page are black.