[ubuntu] CUPS info request

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http://ubuntuforums.org – Hello gentlemen, I do not have a problem - I just want some information. Epson Workforce 545 Ubuntu 12.04.1 server Cups is configured and the printer is going wireless. I have a client workstation using Ubuntu 12.04.1 Desktop. I have the printer hooked up and running as a remote printer so I can send jobs from the client. I am just simply wondering this. The printers.conf file has the device uri as lpd://xxx.xxx.xxx.xx:515/PASSTHRU but on the client the device uri is ipp://sxxx.xxx.xxx.xx:631/printers/EPSON_WorkForce_545. Everything works fine so I am going to let it be. I was just wondering (Hardware)