Lexmark W812 User's Reference - Page 177
PS SmartSwitch, USB Buffer
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PS SmartSwitch Purpose: To configure the printer so it automatically switches to PostScript emulation when a print job received through the USB port requires it, regardless of the default printer language. Values: On* Off Printer examines data on the USB interface and selects PostScript emulation if the data indicates that is the required printer language. Printer does not examine the incoming data. The printer uses PCL emulation to process the job if PCL SmartSwitch is On, or uses the default printer language specified in the Setup Menu if PCL SmartSwitch is Off. See also: PCL SmartSwitch; Printer Language USB Buffer Purpose: To configure the size of the USB input buffer. Values: Disabled Auto* 3K to maximum size allowed Disables serial (Parallel, USB) port. Any jobs already buffered on the disk are printed before normal processing of incoming jobs resumes. Printer automatically calculates the USB Buffer size (recommended setting). User specifies the USB Buffer size. The maximum size depends on the amount of memory in your printer, the size of the other link buffers, and whether Resource Save is set to On or Off. To maximize the range for the USB Buffer size, disable or reduce the size of the parallel, serial, and network buffers. Note: Changing the USB Buffer menu item automatically resets the printer. See also: Resource Save 177