This read-only object is the index (1 to 4) for the LNB monitoring table, identifying which of the unit's LNBs a given row of monitored current, voltage, and alarm data applies to. Like cdd564RxMonitorIndex for demodulators, this index lets an NMS distinguish which of up to four LNBs is reporting a given current or voltage reading or alarm, which matters because a single physical LNB failure should be attributable to the correct antenna feed rather than triggering ambiguity about which feed needs a technician dispatched. An alert firing on the LNB alarm object without also reporting the associated LNB monitor index would leave an on-call engineer unsure which of the site's up to four antenna feeds actually has the failing LNB.