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CUPS consists of a print spooler and scheduler, a filter system that converts the print data to a format that the printer will understand, and a backend system that sends this data to the print device. CUPS uses the Internet Printing Protocol (IPP) as the basis for managing print jobs and queues.
A printing protocol is a protocol for communication between client devices (computers, mobile phones, tablets, etc.) and printers (or print servers).It allows clients to submit one or more print jobs to the printer or print server, and perform tasks such as querying the status of a printer, obtaining the status of print jobs, or cancelling individual print jobs.
Note that the LPD queue name is case sensitive. Some modern implementations of LPD on network printers might ignore the case or queue name altogether and send all jobs to the same printer. Others have the option to automatically create a new queue when a print job with a new queue name is received. This helps to simplify the setup of the LPD ...
cancel previously submitted jobs IPP uses TCP with port 631 as its well-known port . Products using the Internet Printing Protocol include Universal Print from Microsoft, [ 23 ] CUPS (which is part of Apple macOS and many BSD and Linux distributions and is the reference implementation for most versions of IPP [ 24 ] ), Novell iPrint , and ...
Jobs are typically identified by a unique number, and are assigned to a particular destination, usually a printer. Jobs can also have options associated with them such as media size, number of copies and priority. A Print Job is a single queueable print system object that represents a document that needs to be rendered and transferred to a printer.
IT management: instead of having to manage hundreds of print queues on print servers and multiple printers on the user desktops there is only one print queue on each user PC. Costs and environment: Reduces uncollected paper. Green IT: the server-less flavour of pull printing allows the removal of all print servers throughout the company.
A PPD also contains the PostScript code (commands) used to invoke features for the print job. As such, PPDs function as drivers for all PostScript printers, by providing a unified interface for the printer's capabilities and features. For example, a generic PPD file for all models of HP Color LaserJet contains:
In system software, a job queue (a.k.a. batch queue, input queue), is a data structure maintained by job scheduler software containing jobs to run. [1] Users submit their programs that they want executed, "jobs", to the queue for batch processing. The scheduler software maintains the queue as the pool of jobs available for it to run.