Reason for last activation failure of this PU as follows:
noError
- No PU activation failure has been detected
otherError
- Undefined error detected during PU activation
internalError
- Internal resources error detected during PU activation
configurationError
- PU configuration error - PU could not be activated
puNegativeResponse
- Negative ACTPU response received from remote PU
puAlreadyActive
- PU is already active