6.Detailed Section Descriptions
179
Print Data Processing
Flow Chart
The key roles of each part of the print system are outlined below.
The drivers are responsible for generating the page description on the host system and for
transmitting data to the printer.
The I/O manager mediates the connection with the network interface and establishes a device or
print manager connection.
The print manager is responsible for spooling the job (if appropriate) and for feeding jobs to the
correct PDL interpreter.
The PDL interpreters are responsible for turning page descriptions into rendered pages and for
parsing job management comments.
The compression subsystem manages compressed pages in memory.
The page manager coordinates pages for sending to the engine for the most efficient printing,
finishing, and accessory handling.
The video subsystem is responsible for decompressing pages and feeding the engine with
appropriate engine signals. The video subsystem also handles certain print quality processing
functions.
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