If a rogue ONU exists on a PON port of the OLT and has gone online, another ONT or all ONTs connected to the same PON port may go offline or go online and offline frequently.
A rogue ONU that transmits out of schedule or at abnormal optical levels can disrupt upstream time-slotting on the PON, causing collision and interference. This can force other ONUs on the same PON to deregister or flap frequently. Huawei OLTs provide rogue ONU detection/isolation to protect the PON.
[References: HCIP-Access V2.5 Study Guide (PON Faults—Rogue ONU Impact and Handling); Huawei OLT Maintenance Guide (Rogue ONU detection and isolation)., , , , ]
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