AC Option Installed: Check this box if the system has an AC configuration option installed.
AC System Constant: DIT-MCO assigns this value during testing and does not need to be configured by users.
DCS DD-1 Option Installed: Check this box if the system uses a legacy Dielectric Detector 1 option.
Source: NETS User Manual, Revision D, document 132-06035-0006, section 3.2.7.