Edwards Signaling EBPS Remote Booster Power Supply - Manual (Page 26)

20 Remote Booster Power Supply Technical Reference Manual
Class A or B NAC configuration (SW2-8)
Switch SW2-8 controls NAC Class A or B operation for all NACs.
Note: Jumpers JP1 and JP2 must be set to match the operation of this switch.
Table 10: Switch settings (SW2-8)
Switch setting Operation description
ON Class A NACs
OFF Class B NACs