In Huawei IPTV troubleshooting, mosaic/flash/jerky or intermittent picture typically results from packet loss or bit errors. Common causes include: optical power near the receiver sensitivity threshold causing FEC/BER spikes (A); loss of I-frames (key frames) either in the encoder/compression stage (B) or due to line transmission loss/jitter (D); and device rate-limit (CAR/policing) misconfiguration that drops packets under burst traffic (C). Any of these can yield unstable display.
[References: HCIP-Access V2.5 Study Guide — IPTV Service Principles and Fault Location (video artifacts vs. packet loss; optical power thresholds; rate-limit effects); OLT/ONT Video Maintenance Guide — causes of mosaic and black screen., , ]
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