IBM Infoprint 1125 User Reference page 139

NPA Mode
Purpose:
To specify whether the printer performs the special processing required for bidirectional
communication, following the conventions defined in the Network Printing Alliance (NPA) Protocol.
Values:
On
Off
Auto*
PCL SmartSwitch
Purpose:
To configure the printer so it automatically switches to PCL emulation when a print job received
through the network port requires it, regardless of the default printer language.
Values:
On*
Off
See also:
PS
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Printer performs NPA processing. If data is not in NPA format, it is rejected as bad data.
Printer does not perform NPA processing.
Printer examines the data to determine the format and then processes it appropriately.
Note: Changing this menu item automatically resets the printer.
Printer examines data on the network interface and selects PCL emulation if the data
indicates that is the required printer language.
Printer does not examine the incoming data. The printer uses PostScript emulation to
process the job if PS SmartSwitch is On, or uses the default printer language specified in the
Setup Menu if PS SmartSwitch is Off.
SmartSwitch; Printer Language
136