Gestetner G060 Service Manual page 870

CONTROLLER
6.1.3 PRINT DATA PROCESSING
Drivers Connectivity
PostScript
generation
Ethernet
Parallel
PCL
generation
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 between the parallel port or
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.
G082
IO/Print/
PDLs
Device Mgr
DSC
parsing
PostScript
Spooling, PDL
switching
PJL parsing
PCL 5e/5c
6-6
Compression Page Mgr
Page
Compression
Finishing,
Engine loading
Page
Compression
Video
Mgr
Decomp,
Video
G082D904.WMF
SM