| Symptom | Likely Cause | Portable Fix | |---------|--------------|---------------| | | Faulty DC adapter or power bank output <12V | Measure output voltage; use a known good USB-C PD 12V trigger | | PON flashing >5 min | ONT not registered with ISP | Call ISP; provide the ONT’s serial number (on bottom sticker) | | LOS red solid | Fiber break or disconnected | Reseat both ends of fiber cable; inspect for sharp bends | | LAN LED off | Bad Ethernet cable or device port | Replace cable; try different client device | | IP address 169.254.x.x | No DHCP from ISP | Power cycle ONT; if persists, ISP has VLAN tagging—manually set VLAN 10, 20, or 35 via web UI | | Slow speeds | Dirty fiber or duplex mismatch | Clean connectors; force your laptop’s Ethernet to 1 Gbps Full Duplex |
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