NEC Built-In AIT User Manual page 25

Setting terminator power - Terminator Power -
Set whether terminator power is supplied to the SCSI bus or not.
Use Switch 5. Setting Switch 5 to ON will supply terminator
power; setting Switch 5 to OFF (factory-set to OFF) will not
supply terminator power.
Important
When the Built-In AIT is equipped with the N8541-28F/N8141-28AF device expansion unit and
you want to use the slaved power feature, leave Switch 5 to OFF.
Setting data compression - DC Control (1) -
Set whether the Built-In AIT's data compression function is
enabled or disabled.
Use Switch 7. Setting Switch 7 to ON (factory-set to ON) will
enable the data compression function; setting Switch 7 to OFF will
disable the terminator data compression function.
Setting data compression - DC Control (2) -
Set whether control of data compression from the backup software
is enabled or disabled.
Use Switch 8. Setting Switch 8 to ON will disable control of data
compression from the backup application; setting Switch 8 to OFF
(factory-set to OFF) will enable control of data compression from
the backup software.
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Built-in AIT 25
ON
ON
ON