Downstream exhibits noise, MER values are relatively low.
Using the Mediabox XL (in particular this older SMT-G7400 type) as a modem router is not recommended, it should be used as a TV decoder only. A separate modem router (SmartWifi modem) should be installed.
Could you post one or more pictures of the AOP (main outlet near electrical meter/fuse box or in living room) and cables, plus splitter(s) and signal amplifier, as applicable? If the AOP is not inside the living room, please post pictures of both the AOP and the outlet which the Mediabox XL is connected to.