This read-only object identifies the demodulator index (1-4) for which a stored event log is being returned. This lets an admin query the stored fault-event history independently for each of up to four demodulators, so a technician investigating an intermittent fault on one specific link needs to make sure they're reading the event log associated with that demodulator's index rather than a different one on the same chassis. When investigating repeated dropouts reported only on the antenna feed connected to one specific demodulator, an admin would set this object to that demodulator's index before walking the corresponding event descriptions to see that demodulator's specific fault history.