XEROX DOCUPRINT 180 LPS PDL REFERENCE 5-1
5. 5Defining clusters
The DocuPrint 180 LPS provides several methods for feeding paper.
There are internal trays (trays 1-3) and a bulk input enablement
(tray 7).
Each of the input source trays can be addressed and used
individually. They can also be addressed in groups, such as pairs, or
groups of three and used in groups as clusters.

Cluster features

Clusters are a systematic method provided for feeding specific paper
stock to print jobs. The following are major cluster features:
•One or more feeder trays are identified as a single logical group
called a "cluster."
•Each cluster feeds one stock type to the LPS wh ich
automatically selects between the cluster trays as they become
empty or as page size requirements change.
•Cluster can have stock in different sizes.
•One or more trays in the cluster may be "preferred." Preferred
trays are trays recommended by the application programmer or
by the site supervisor for the operator to load the stoc k.
•Trays actually loaded with the stock are the "current" trays.
•Operator can override the preferred tray recommendation.
•Data stream can specify the cluster used to feed a page.
•Operator can override the data stream instructions by selecting
a specific cluster or tray.

Cluster processing overview

Briefly, the programmer creates applications which tell the system
controller on which stock jobs are to be printed. The operator loads
the stock and informs the system controller which stock is in which
tray. The system controller then processes the job in two steps:
•Identifying the stocks requested by the application
•Selecting a feeder tray for each page by checking the cluster
name and paper size associated with the page.