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ADJUSTING PRINT QUALITY AND SPEED
XEROX DOCUPRINT 96/4635/180 NPS TROUBLESHOOTING GUIDE 7-7
Since the DocuPrint usually decomposes more than one job at a
time, the jobs are time-shared on the one processor and this will
cause the decomposition time to be larger than if the DocuPrint
decomposed once by itself. In the sample log, there are always 3 jobs
printing at the same time and the decomposition times reported vary
from 83.69 to 85.02. After submitting this job by itself, the
decomposition time reported is:
PPM=60x217/83.51 = 155.9 pages per minute
This is considerably higher than the maximum speed of the printer,
so it is very likely that this job prints at rated speed.
Minimizing the start-up latency
There are two ways to get a measurement that minimizes the impact
of the start-up latency of the printer.
• Use a stopwatch to measure the elapsed time from when the
first sheet is delivered to when the last sheet is delivered to the
output tray.
• Take the start time and stop time from the sequencer for a
larger block of jobs.
Using the second method, the same job as in the first example was
submitted 10 times to measure the throughput for 2170 pages. Here
is part of the log:
Job #213 start, ftpadmin, 99995163.ps, November 19, 1996 1:05:04 pm PST
Printing duplex, 300 spi, 216 x 279 mm, 139 buf
Job #213 stop, ftpadmin, 99995163.ps, November 19, 1996 1:07:17 pm PST
pages: 217, decomp: 83.51, elapsed: 134.70