Xerox 701P47301 manual Run Time Considerations, Interaction Between Streaming and Spooling Jobs

Using Xerox FreeFlow® Print Server IPS Manager

Run Time Considerations

This section describes the operation of the system when a job is running.

Interaction Between Streaming and Spooling Jobs

In an IPDS environment, the Host IPDS client (e.g. PSF) performs job scheduling. While an IPDS streaming job is active, the printer continues to receive and spool other print data types (excluding other streaming jobs). When an IPDS streaming job is finished, or times out, spooled jobs are scheduled to print according to standard Xerox FreeFlow® Print Server scheduling algorithms.

For example, if an IPDS streaming job is in progress, and an LPR job or other spooling network job is sent to the printer, the system recognizes it and spools it. This job stays in the spool until the IPDS streaming job is done. When the IPDS job is done, IPDS gives up the stream and allows other jobs to be scheduled. The system can take in any number of spooling jobs from LPR or any other network source and add them to the spool. When a spooling job is printing and the system receives an IPDS streaming job, the IPDS job goes into the job pool and starts processing when the spooled job and any other previously scheduled jobs are done.

Only one streaming queue can be active on the printer at a given time. If a user attempts to submit an IPDS job while another streaming job is processing, the system tries to start the job at periodic intervals. The retry attempts continue until the other job completes. The Xerox FreeFlow® Print Server GUI does not indicate that retries are in progress or that a new IPDS job is waiting to print. If a non-IPDS spooling job is in progress when an IPDS job is received, the IPDS job starts processing automatically once all previously queued spooled jobs are complete.

IPDS Jobs and Paused Systems

It is important to be aware that submitting an IPDS job to a paused Xerox FreeFlow® Print Server will cause it to stop after receiving the first page. While other PDL types can RIP and wait for the paused printer, this is not the case for IPDS and is normal behavior for an IPDS job. Because IPDS is a streaming PDL, the printer must report the paused status to the host and force the printer status on the host to enter a not ready state. The host will suspend data transmission until the printer is taken out of the paused state.