This attribute defines the status of the PSU in what concerns supplying power to the chassis. NotActive(1) - indicates a disabled or defective PSU which cannot supply power to the chassis. Dormant(2) - indicates a functional PSU which is installed for backup purposes and can at any moment supply power to the devices in the chassis. Active(3) - indicates that the PSU supplies power to the chassis. Failed(4) - indicates PSU failure (new LET-36 and LET-20). Unknown(5) - when the PSU activity is not readable or unknown. NotExist(6) - indicates absence of PSU from the configuration. NoBackupPS(7) - indicates absence of Backup PSU from the configuration. The following values are supported for each hub: Stack: active, failed, notExist, noBackupPS LET-36: active, failed, notExist. LET-20: active, failed, notExist. LET-10: active, failed, unknown.